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Dramane Ouattara, Romuald Sonan Assi, Charles Koffi Boussou y Séraphin Kouakou Konan. "Diversity and degree of organization of the Ichthyofauna of two branches of the Bandama river in the Marahoue region (Central West of Côte D’Ivoire)". International Journal of Science and Research Archive 3, n.º 1 (30 de julio de 2021): 062–70. http://dx.doi.org/10.30574/ijsra.2021.3.1.0108.
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Diversity and Degree of organization of the ichthyological population of two tributaries of the Bandama River in the Marahoue region located in the center-west of Côte d'Ivoire were studied. Indeed, the two tributaries of the Bandama River that are Marahoue and White Bandama Rivers draining this region are subject to numerous disturbances, the main one being gold panning. Data collection was conducted from September 2019 to November 2020 from experimental and artisanal fisheries. The mesh sizes of the gillnets used for the experimental fishery varied from 10 to 40 mm mesh size. The results showed a dominance of the order Siluriformes represented by 6 families and 18 species in the Marahoue River against 4 families and 13 species in the White Bandama River. Also, the Shannon Index (H') values obtained in the White Bandama River (H' fluctuates from 2.26 to 2.33 bits/ind) are lower than those obtained in the River Marahoue (H' fluctuates from 3.02 to 3.14 bits/ind). Our results also highlighted the equitability. This index appeared relatively high in the Marahoue River (E varies from 0.77 to 0.80) compared to the White Bandama River (E varies from 0.5 to 0.57). Consequently, the Marahoue River appears to be more stable and has a good degree of organization of the ichthyological population compared to the White Bandama River.
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Bhuiyan, Mohammad Azmal Hossain y Moniruzzaman Khondker. "Water quality and potamoplankton of the river Buriganga and Gomti: A comparison". Dhaka University Journal of Biological Sciences 27, n.º 2 (20 de julio de 2018): 191–200. http://dx.doi.org/10.3329/dujbs.v27i2.46467.
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The studied section of the river Buriganga besets with urban catchment contained higher values of pH, alkalinity, CO2, conductivity, TDS, SRP, SRS and NO3-N concentration compared to its counterpart, namely a section of the river Gomti having rural catchment characteristics. The mean values for a period of six months for the river Buriganga were 8.34, 1.48 meq/l, 8.49 mg/l, 686 μS/cm, 155.17 mg/l, 493 μg/l, 36.07 mg/l and 810.28 μg/l for pH, alkalinity, CO2, conductivity, TDS, SRP, SRS and NO3-N, respectively. While the same for the river Gomti was 7.86, 1.18 meq/l, 5.42 mg/l, 284.44 μS/cm, 79.91 mg/l, 188.37 μg/l, 26.41 mg/l and 203.99 μg/l, respectively for pH, alkalinity, CO2, conductivity, TDS, SRP, SRS and NO3-N. In the river Gomti, the concentration of DO was better (7.87 mg/l) compared to that of river Buriganga (5.53 mg/l). Because of a hilly origin of the river Gomti and availability of sediments in its water, the underwater light climate was poor compared to the river Buriganga. The Secchi depth recorded for Gomti and Buriganga were 0.26 and 0.54 m, respectively. Both the rivers were found diatom dominant in terms of population but the species prevailed were different. Fragillaria virescens Ralfs was the dominant diatom of the river Buriganga. Its density ranged from 6.5-11.09×105 ind/l which was the highest compared to the population of all other groups of potamoplankton. In Gomti another diatom namely, F. pinnata Ehrenberg was dominant and the density of which ranged from 8.45 - 12.65 × 105 ind/l. Community structure of the potamoplankton revealed 30 species from the river Buriganga and 22 species from Gomti. The study reveals that relatively higher concentration of nutrients prevails in the water of the river course having urban catchment characters compared to the rural ones.
Dhaka Univ. J. Biol. Sci. 27(2): 191-200, 2018 (July)
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Koshelev, V. N. y N. V. Kolpakov. "Species composition and distribution of fishes and prawns in the Amur River channel". Izvestiya TINRO 200, n.º 2 (5 de julio de 2020): 292–307. http://dx.doi.org/10.26428/1606-9919-2020-200-292-307.
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istribution of fishes and prawns in the Amur River (40–960 km from the mouth) is described on results of the beam-trawl survey conducted in September-October, 2003 (57 trawl stations at the depth of 1.5–23.0 m). In total, 2584 ind. of 22 fish species and 1077 ind. of 1 invertebrate species (prawn Palaemon modestus) were caught. The highest species richness was registered for orders Cypriniformes (13 species) and Siluriformes (4 species). The fish and prawn stocks were evaluated as 32.161 . 106 ind. (583.8 t) for bottom and near-bottom fish and 4.887 . 106 ind. (8.8 t) for prawns. Two commercial fish species were the most abundant: catfishes Tachysurus brashnikowi (16.26 . 106 ind. or 32.9 % of total biomass) and T. sinensis (4.32 . 106 ind. or 24.0 % of total biomass); other 6 fish species with considerable biomass were lizard gudgeon Saurogobio dabryi (12.6 %), ussuri catfish T. ussuriensis (9.7 %), amur white-pinned gudgeon Romanogobio tenuicorpus (7.8 %), amur sturgeon Acipenser schrenckii (5.6 %), amur gudgeon Gobio cynocephalus (2.4 %), and kaluga Huso dauricus (0.6 %). Distribution density varied in the range of 0.01–2.57 g/m2 (on average 0.45 ± 0.27 g/m2) for fish and 0.005–0.044 g/m2 (0.021 ± 0.012 g/m2) for prawns. Abundance of both fish and prawns increased multifold towards the Amur mouth that correlated with increasing of forage benthos biomass in the same direction. So, the main portion of fish biomass (82.4 %) was distributed in the Amur River downstream (40–400 km from the mouth) and the prawn stock was concentrated completely in its lowermost part (50–150 km from the mouth).
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Widyarini, Happy, Niken T. M. Pratiwi y Sulistiono. "ZOOPLANKTON COMMUNITY STRUCTURE AT MAJAKERTA ESTUARY AND ITS SURROUNDING WATERS, INDRAMAYU REGENCY, WEST JAVA PROVINCE". Jurnal Ilmu dan Teknologi Kelautan Tropis 9, n.º 1 (2 de noviembre de 2017): 91–103. http://dx.doi.org/10.29244/jitkt.v9i1.17919.
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Majakerta estuary and its surrounding waters have a high potential fishery resource which is commonly utilized by the community around the area. Fluctuation of physical and chemical parameters of the waters and fishery activities around the estuary can influence the existence of zooplankton. This study was conducted from December 2014 to May 2015. Samples of the zooplankton were collected monthly at four stations (consisted of sea, river and estuary areas). Based on the study, zooplankton in the Majakerta estuary and its surrounding waters consisted of six classes; i.e. Protozoa (11 genera), Crustaceae (4 genera, 1 nauplius stadia), and Rotifera (4 genera). A higher abundance was found at the sea (29025 ind./m3), while a lower abundance was at the river and estuary (7147 ind./m3 dan 7582 ind./m3). Based on the zooplankton diversity index, it can be inferred that the value was relatively low. There were two habitat groups, namely Station Group 1 (Station 1 and 2; river and estuary) and Station Group 2 (Station 3 and 4; sea) with influencing parameters such as transparency, pH, and salinity. Keywords: estuary, Majakerta, zooplankton, community structure
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Winarti, Winarti y Arman Harahap. "The Diversity of Makrozoobenthos as Bio-Indicators of Water Quality of the River Kundur District Labuhanbatu". Budapest International Research and Critics Institute (BIRCI-Journal): Humanities and Social Sciences 4, n.º 1 (15 de febrero de 2021): 1027–33. http://dx.doi.org/10.33258/birci.v4i1.1732.
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Macrozoobenthos used as a bioindicator of the waters, this happens because of the nature of the benthos which has mpergerakan low so it got a lot of influence from the environment. This study aims to determine the condition of the river Kundur with a view the community structure of macrozoobenthos which include: species composition, abundance, diversity, uniformity and dominance as well as the physical and chemical parameters of water as a paremeter supporters. Based on the results of observations, macrozoobenthos were found during the study in the river Kundur consists of 3 phylum, 4 classes, 17 family with 11 species. The composition of the class of macrozoobenthos in the whole of the observation station consists of a Gastropod (37%), Insecta (23%), Malacostraca (20%), Polychaeta (10%) dan Malacostraca (20%). The value of an abundance ranged from 325,7 - 3309,6 ind/m3. With the value of the total abundance at Station I which is equal to 3690,1 ind/m3, Station II 3723,1 ind/m3, Station III 3692,3 ind/m3 can be categorized diversity are light polluted with the value of the index of uniformity (E) that describes the spread of the individual tends to be uniform or relatively the same. While the condition of the physical-chemical parameters and the substrate bottom of the river Kundur in general has a range of relatively homogeneous, spread evenly throughout the observation stations and still be able to support life macrozoobenthos. To the results of measurements of the parameters of physico-chemical water and substrate in the river kundur in general has a range of relatively homogeneous in the whole observation stations and still be able to support the life of the macrozoobenthos.
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Et al., Ajeel. "Diversity, Abundance, and Distribution of Cladocera at the end of the Tigris River North of Basrah – IRAQ". Baghdad Science Journal 16, n.º 4 (1 de diciembre de 2019): 0854. http://dx.doi.org/10.21123/bsj.2019.16.4.0854.
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Seasonal variations of the species composition and abundance of Cladocera were studied in two stations at the end of the Tigris River and one station at the confluence of the Tigris with Euphrates area, at the beginning of the Shatt Al-Arab River in Al-Qurnah North of Basrah Province, from October 2015 to August 2016. Samples of zooplankton were collected by plankton net 100-µm. mesh size. The population density of Cladocera ranged between 1 Ind /m³ during summer and 211 Ind./m³ during winter at station 1 (Al-Jewaber Bridge). A total of 16 species of Cladocera belonging to 12 genera were recorded in the study. The average density of Cladocera ranged from 23.2 ind./m3 at Station 2 (Hamayon Bridge) to 53.7 Ind./m3 at Station 1 (Al-Jewaber Bridge). The results showed that the Bosmina meridionalis was dominant at the three stations 47.8%, while the other species were as follow Moina affinis 15.1%, Daphnia lumholtzi 9.3%, Simocephalus (Simocephalus) vetuloides 8.1% and Daphnia exilis 6.6% of the total Cladocera.
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Kawirian, Rizky Regina, Arif Nurcahyanto, Didit Abdillah, Grin Tommy Panggabean, Muhammad Irfan Afif, Ahyar Pulungan, Chichilia Qaila Azzahra Rahman, Mursalin Ishak y Majariana Krisanti. "Produktivitas Sekunder Organisme Bentik (Ordo Diptera) di Sungai Cigambreng, Desa Tapos, Kecamatan Tenjolaya, Kabupaten Bogor, Jawa Barat". Journal of Tropical Fisheries Management 4, n.º 1 (29 de mayo de 2020): 43–48. http://dx.doi.org/10.29244/jppt.v4i1.30904.
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Insekta has biodiversity with a wide distribution throughout the world. Sampling was carried out once a week during October 2019. A total of 717 specimens of Order Diptera were found which covered two families in the Cigambreng River. Each family obtained includes one type, Antocha sp. (Family Tipulidae.) and Krenopelopia sp. (Chironomidae). The presence of a chironomid has indicates an excessive input load (pollutant) into the waters of the Cigambreng River. In general, the highest abundance was obtained at the fourth observation, 284 ind/m2, while the lowest abundance was obtained at the second observation, which was 60 ind/m2. Secondary productivity covers P/B ratio of 3.034 /month with a production speed of 14.2458 (g/m2/month) and biomass (4.6954 g/m2).
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Susilo, Hendri, Musrifin Ghalib y Aras Mulyadi. "MAPPING OF MANGROVE VEGETATION USING LANDSAT SATELLITE IMAGERYIN THE ESTUARY OF GANGSAL RIVER INDRAGIRI HILIR REGENCY RIAU PROVINCE". Asian Journal of Aquatic Sciences 2, n.º 3 (24 de enero de 2020): 181–89. http://dx.doi.org/10.31258/ajoas.2.3.181-189.
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The research was conducted in January - March 2019. This study aims to map and analyze changes in the area and density of mangrove vegetation based on NDVI values and community structure in the Muara Sungai Gangsal, Indragiri Hilir Regency. To analyze the area and density of NDVI using Landsat 5 TM satellite imagery in 2008 and Landsat 8 OLI/TIRS in 2018. Analysis using ArcGis 10.3 software. The calculation of mangroves based on community structure used the Transect Line Plot method at 6 stations for community structure sampling. The area of mangrove vegetation in 2008 was 2,706 ha and in 2018 it was 2,693 ha. The results of the analysis of mangrove vegetation area from 2008 to 2018 there was a reduction of 13 ha. The NDVI value for 2008 criteria is rarely 133 ha, while 2.009 ha are wide and 564 ha is dense. The NDVI value of the 2018 mangrove vegetation is rarely 16 hectares, while 2,135 hectares are in the area and 542 hectares are dense. Based on the analysis of mangrove density in 2018 at 6 sampling point stations ranging from 866 ind/ha to 1,522 ind/ha. Density criteria are rarely detected at station I with a density of 922 ind/ha and station II with a density of 866 ind/ha. The criterion of moderate density was detected at station V with a density of 1,255 ind/ha and station VI with a density of 1,044 ind/ha. Criteria for solid density were detected at station III with a density of 1,522 ind/ha and station IV with a density of 1,511 ind/ha.
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Journal, Baghdad Science. "Biodiversity of Rotifera and Cladocera in the upper region of Euphrates River- Iraq". Baghdad Science Journal 4, n.º 2 (3 de junio de 2007): 221–32. http://dx.doi.org/10.21123/bsj.4.2.221-232.
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Five representative sampling stations were selected in upper region of Euphrates river. Bimonthly sampling were collected from December 2000 to December 2001. Rotifera showed high density in December 2000 while high density of cladocera which recorded in October .The results of relative abundance index showed that rotifera: Polyarthera dolichoptera , Keratella cochlearis , K. valga, Cephalodella auriculata and cladocera: Bosmina longirostris , B.coregoni ,Chydorus spharicus, were more abundant in study stations. The results of constancy index showed 4 taxa belonged to rotifera and 2 taxa belonged to cladocera which were considered constant in the Euphrates river, where the other species varied between accessory and accidental species in study stations. The index values of Species richness of rotifera varied between 0.41 – 2.8 and cladocera varied between 0.5 - 1.95. The Shanon-Weiner index of rotifera varied between 0.54-1.72 bit/ind., while the Shanon index of cladocera varied between 0.5-1.6 bit/ind. The uniformity index of rotifera varied between 0.41 – 0.99 but the uniformity index of cladocera varied between 0.61- 0.98 .
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Shevchuk, L., L. Vasilyeva, M. Taradajnyk y S. Mezhzherin. "Freshwater Mussels (Mollusca, Bivalvia, Unionidae) of the Danube River Basin of Ukraine". Zoodiversity 55, n.º 1 (2021): 41–50. http://dx.doi.org/10.15407/zoo2021.01.041.
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During 2009–2011, 50 points of the Daube River Basin were surveyed. In 23 of them, seven species of Unionidae were recorded: U. pictorum, U. tumidus, U. crassus sensu lato, A. anatina, A. cygnea, P. сomplanatа and S. woodiana, which is an invasive species. Th e index of occurrence of freshwater mussels in general was 100 % in the Lower Danube River (5 study areas), 42 % in Tisa River (31 study areas), 33.3 % in Seret River (3 study areas), 36 % in Prut River (11 study areas). Th e index of occurrence of species was rather low: 24 % of A. anatina, 22 % of U. tumidus, 22 % of U. crassus, 16 % of U. pictorum, 14 % of P. complanata, 14 % of S. woodiana, and 2 % of A. cygnea. U. crassus was not found in the Lower Danube river, while A. cygnea was found only there outside the main watercourse. Th e invasive species S. woodiana occurred in the Lower Danube River and in the sub-basin of Tisa River (with 83 % and 20 % frequency, respectively. Th e mean values of population densities ranged from 1.00 (A. cygnea) to 6.14 ind./m2 (S. woodiana), and the mean biomass varied from 1.14 (P. сomplanatа) to 797.54 g/m2 (S. woodiana).
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Journal, Baghdad Science. "Sludge worms species (Oligochaeta: Naididae: Tubificinae) From Different Aquatic Habitat in Baghdad / Iraq". Baghdad Science Journal 10, n.º 2 (2 de junio de 2013): 269–81. http://dx.doi.org/10.21123/bsj.10.2.269-281.
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The present investigation is concerned primarily with sorting and identification of subfamily Tubificinae from River Tigris and some water surface in Baghdad /Iraq . For this purpose six study sites were chosen, including a Al- Kadhemyia drainage canal, North Baghdad; three sites on the shore of River Tigris; in addition to site in Al-Jaish canal , East Baghdad, finally the sixth site was from pond in Al-Zawra'a park , within the center of Baghdad .These sites were characterized by sediment rang from clay, silty-clay to silty with a percentage of organic matter ranged between 0.7% - 9.9% . According to water temperature, salinity and pH values, they were nearly identical in all study sites, the water temperature was ranged through the study period between 12.5 – 300 C , while electrical conductivity and salinity values were ranged beteen 733.5-1227.5 ?s ,which equivalent to 0.469-0.787 ‰ salinity. All sites were slightly alkaline ,so the pH values were ranged between 7.5-8.1. 3628 individuals were sorted from 24 samples collected from different study sites.. Twelve species were identified belonging to seven genera, including , Limnodrilus hoffmeisteri, L. claparedeianus, .L. profundicola, . L.udekemianus , L. silvani, Tubifex tubifex, Branchiura sowerbyi, Potamothrix. 2013 )2( ???? ????? ?????? ???? 10 982 bavaricus, , P. hammoniensis, Psammoryctide moravicus, Monopylephorus irroratus, and Rhyacodrilus coccineus. The result revealed that Al-Jaish canal and Tigris River / al-Sarafyia were considered as the richest sites according to the number of species recorded, where 8 species were recorded in each of them, but Al-Jaish canal had higher individual number of 1346 individuals , followed by Al-Kadhemyia drainage canal recorded only three species with high total individual number of 606 individual. The lowest total individual number was recorded in Tigris River / Al- Zaafaranyia of 326 individual. L. hoffmeisteri, records higher individuals number of 1870 individual , followed by B. sowerbyi which records 946 individual. Both species recorded highest percentage occurance of 100% followed by 79.16% recorded by L. profundicola. High densities of Tubificinae were recorded during all study period. The highest density was during March-April, reached between 2109 -534.9 ind/m2 in Tigris River sites , 7270.5 ind/m2 in Al-Jaish canal and 2419.8 ind/m2 in Al-Zawra'a pond. The .results of relative abundance revealed that L. hoffmeisteri was the dominant species in site Tigris River/Al- Jaderyia, and abundant in other study sites. B. sowerbyi was abundant in all study sites, while other species were recorded between few to rare species except L. udekemianus which was abundant in site Al-Jaish canal, and T. tubifex in site Tigris River / Al- Zaafaranyia.
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Astuti, Lismining Pujiyani y Yayuk Sugianti. "SEBARANLONGITUDINAL FITOPLANKTONDI SUNGAIMARO, KABUPATENMERAUKE, PROVINSI PAPUA". BAWAL Widya Riset Perikanan Tangkap 3, n.º 4 (3 de febrero de 2017): 269. http://dx.doi.org/10.15578/bawal.3.4.2011.269-275.
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Sungai Maro merupakan salah satu sungai besar di Kabupaten Merauke, berfungsi sebagai habitat ikan hias yang bernilai ekonomis penting yaitu ikan arwana (Scleropages jardinii) dan kakap batu (Datnioide aquadraticus). Wilayah sekitar sungai merupakan rawa-rawa yang merupakan habitat ikan arwana terutama di wilayah tengah sampai hulu sungai. Fitoplankton merupakan produser dan pakan alami beberapa jenis ikan di SungaiMaro. Tujuan penelitian ini untuk mengetahui sebaran longitudinal fitoplankton yang ada di SungaiMaro, Kabupaten Merauke. Penelitian ini dilakukan dengan survei dan pengambilan contoh dilakukan pada bulan Desember 2007 di lima stasiun pengamatan pada lokasi pemijahan ikan arwana di ruas Sungai Maro. Parameter yang dianalisis adalah komposisijenis dan kelimpahan fitoplankton. Hasil pengamatan di lima stasiun pengamatan, ditemukan lima kelas fitoplankton yang terdiri atas kelas Chlorophyceae (14 genus), Cyanophyceae (satu genus), Bacillariophyceae (tujuh genus), Dinophyceae (dua genus), dan Euglenaphyceae (satu genus), dengan kelimpahan fitoplankton berkisar 49.294- 66.396 ind./L. Persentase fitoplankton tertinggi dari ruas atas sampai bawah adalah Staurastrum dominan dari Stasiun Barkey danWeloyah, Synedra di Stasiun Mouwer dan Toray, Ulothrix di Stasiun Kaliwanggo. Sedangkan urutan keberadaan kelas fitoplankton dari ruas atas sampai bawah di SungaiMaro adalah Chlorophyceae di StasiunBarkey, Weloyah, dan Mouwer, kemudian Bacillariophyceae di Stasiun Toray dan Chlorophyceae di Stasiun Kaliwanggo. Maro River is one of big river inMerauke Regency and serve as ornamental fish habitat of arowana (Sleropages jardinii) and Datnioides aquadraticus that economically has high value. Around of this river are wetland area that is arwana habitat mainly at middle and upper river. Phytoplankton is natural feed producer for several fishes species at Maro River. Aim of this paper was to know longitudinal distribution of phytoplankton atMaro River. The research was conducted by survey method and sampling was conducted in December 2007 at 5 sampling stations on arwana fish spawning sites located at Maro River. The parameters were analyzed include composition and abundance of phytoplankton. Result showed that at five sampling stations were found 5 classes of phytoplankton which consists of the class Chlorophyceae (14 genera), Cyanophyceae (1 genera), Bacillariophyceae (7 genera), Dinophyceae (2 genera), and Euglenaphyceae (1 genera) with the abundance of phytoplankton ranges from 49,294- 66,396 ind./L. The highest percentage of phytoplankton in each station was found from upper to lower segment was Staurastrum found at Barkey and Weloyah Synedra at Mouwer and Toray, Ulothrix at Kaliwanggo. While the presence of phytoplankton class was found from upper to lower on Maro River was Chlorophyceae at Barkey, Weloyah, andMouwer, Bacillariophyceae at Toray and Chlorophyceae at Kaliwanggo.
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Purwanto, Purwanto, Suriani Br Surbakti y Rosye H. R. Tanjung. "Studi Kualitas Perairan Danau Sentani Menggunakan Bioindikator Makrobentos". JURNAL BIOLOGI PAPUA 5, n.º 2 (14 de octubre de 2018): 53–59. http://dx.doi.org/10.31957/jbp.524.
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Study on the water quality of Sentani Lake has been carried out during October–November 2012 at 3 stations of observation. Observation and retrieval of macrobenthos have been done by using combination between line transect method and square plot. While for physical and chemical characteristics of water is measured in site and at laboratory. Index of variance Shannon-Wiener, Evenness and Density as well as Pollution Index were used to analyse the physical and chemical characteristics of water. Result of this study showed that Telaga Maya area (station 3) has the highest variation of macrobenthos with H’ value= 2.12 while the lowest variation (H’= 1.66) was found around Ekspo River (station 2). Based on population density of macrobenthos, Pilsbryoconcha exilis which collected in the area of Jembatan Dua River (station 1) was found as the highest population with density 9.26 ind/m2, while the lowest population density was Melanoides tuberculata with density 0.93 ind/m2. It can be concluded that based on the value of variance index and Pollution Index, the water quality of Sentani Lake belong to low-medium polluted category.Key words: water quality, macrobenthos, sentani lake and Jayapura.
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PÉREZ, M. C., S. BONILLA y G. MARTÍNEZ. "Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay". Revista Brasileira de Biologia 59, n.º 4 (noviembre de 1999): 535–41. http://dx.doi.org/10.1590/s0034-71081999000400002.
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This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic condition of the system. In cold months phytoplankton distribution was homogeneous among sampling stations, while in warm months, spatial heterogeneity was detected, suggesting that sampling stations can behave as independent compartments.
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Alam, MK, MA Uddin, MF Satter y N. Majed. "Seasonal variation of water quality and waste loads in Buriganga river with GIS visualization". Bangladesh Journal of Scientific and Industrial Research 55, n.º 2 (16 de junio de 2020): 113–30. http://dx.doi.org/10.3329/bjsir.v55i2.47632.
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Pollution status of the Buriganga river has been assessed in this study using GIS tool to analyze the spatial and seasonal distribution of several water quality parameters from six surface water sampling stations. In addition, characterization of water quality from certain selected outfalls discharging wastewater along the river was accomplished as well. The observed surface water quality concentration was higher during dry season for BOD5 (13.68-22.8 mg/l), COD (22-30 mg/l), TDS (280- 303 mg/l), PO4(5.6- 7.3 mg/l) while an exception was found for NH3-N (0.67- 0.89 mg/l) and Turbidity (25.19 to 91.18). The DO level was found noticeably lower during dry season (1.73 to 2.36 mg/l) than wet season (3.27 to 4.68 mg/l). Moreover, Principal Component Analysis identified high ionic distributions during wet season and more organic pollution during dry season. Water quality parameters TDS, TSS, EC and COD were obtained in high concentration levels from industrial outfalls towards the downstream of the river while BOD5, NH3-N were higher from municipal wastewater outfalls towards the upstream of the river. The observed pollution loading from the outfalls revealed the location at Dholaikhal as the major pollution source in the river with a BOD5 (11681- 12243 kg/day) and TDS (9749- 32348 kg/day) loading. Accordingly, influence of nearest wastewater sources on the surface water quality was evident through GIS representation of the parameters.
Bangladesh J. Sci. Ind. Res.55(2), 113-130, 2020
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Marhadi, Marhadi, Ira Galih Prabasari y Ria Pratiwi. "Hubungan Keanekaragaman dan Keberadaan Plankton Terhadap Faktor Fisika Kimia Sungai Batanghari". Jurnal Daur Lingkungan 1, n.º 2 (2 de octubre de 2018): 55. http://dx.doi.org/10.33087/daurling.v1i2.11.
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Water pollution can not only be measured only by chemical and physical parameters, Plankton have properties that are always moving so that they can be used as indicators of water pollution. Plankton play an important role in influencing the primary productivity of river waters. The purpose of this study was to determine the relationship between the diversity and presence of plankton to the quality of the Batanghari River. The study was conducted in February 2018 in Jambi City. Primary data taken in the form of concentrations of physical and chemical parameters include turbidity, pH, TDS, BOD, COD, DO, Phosphate, Nitrate, Nitrite, Ammonia, Lead, Chloride, Sulfate and the amount of plankton abundance (ind / L) on the Batanghari River. The time of sampling was in the morning and evening on the same day. The results showed that the relationship between the existence of plankton and the quality of the Batanghari River showed the condition of the Batanghari River in Jambi City was in phase a - Mesosaprobic (heavy pollutant level). Parameters of pH, COD, Phosphate, Nitrite, Lead and Chloride are moderately correlated to phytoplankton, while TDS, BOD, DO, Nitrate and Ammonia are weakly correlated with phytoplankton. And for temperature parameters it is strongly correlated with phytoplankton. For correlation to zooplankton, parameters of pH, TDS, BOD, COD, COD, DO, Phosphate, Nitrate, Nitrite, Lead, chloride are very weakly correlated while ammonia and turbidity correlate moderately to zooplankton.
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Bahtiar, Bahtiar y Muh Fajar Purnama. "Habitat Preferences of PokeA (Batissa violacea var. celebensis von Martens, 1897) Basic on Substrat Characterisation in Pohara River Southeast Sulawesi". Jurnal Moluska Indonesia 4, n.º 2 (1 de octubre de 2020): 74–82. http://dx.doi.org/10.54115/jmi.v4i2.9.
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This research is motivated by the lack of information about the habitat preferences of pokea clams in Pohara River, Southeast Sulawesi. This study aims to determine the density, distribution pattern and habitat preferences of pokea clams in the Pohara River, Southeast Sulawesi. This research was conducted for 6 months (April-September 2011). Sampling of pokea, water quality, and sediment texture was carried out in the Pohara River and analyzed at the FPIK UHO Laboratory. The density and distribution of pokea were calculated using a standard formula and analyzed using Mann Whitney and Chi Square respectively, while the habitat preferences based on different substrate textures were analyzed using Principal Component Analysis (PCA) and Cluster Analysis (CA) in the Multivariate Statistical Package (MVSP). The results showed that the density of pokea clams ranged from 117±96.78-816±594.84 ind/m2 which was distributed in cluster over the entire cross-section of the river. Pokea clams were found in all substrate textures from gravel to clay. The habitat preference of pokea clams indicated by the highest density was found in the clay texture. Pokea clams relatively do not like the habitat of coarse sand and gravel texture which is characterized by pokea population with the lowest density
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Mimier, Daria, Elżbieta Żbikowska y Janusz Żbikowski. "Water residence time in the Włocławek dam reservoir (the Vistula river, Poland) affects its macrozoobenthos structure". Annales de Limnologie - International Journal of Limnology 54 (2018): 24. http://dx.doi.org/10.1051/limn/2018016.
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The aim of our study was to compare the macrozoobenthos structure as well as water and organic matter content of the bottom sediments of two hydrologically different zones of a strongly fluvial the Włocławek Dam Reservoir. Samples were collected from the Włocławek Dam Resevoir at six sites. Three of them were located in the upper, rheolimnic part (URP) of the reservoir and three others in its lower, limnetic part (LLP). Water transparency, sediment water content and organic matter content in the sediments were higher in the LLP. The higher number of taxa and diversity of macrozoobenthos were found in the URP of the reservoir. The density of bottom fauna was slightly higher in the LLP (90,990 ind. m−2) than in the UPR (73,486 ind. m−2), while the significantly higher biomass of macrozoobenthos was found in the URP of the reservoir (2314 g · m−2) than in the LLP (336 g · m−2). The dominant taxa of Oligochaeta and Chironomidae larvae did not show significant differences in the density between both zones. Some taxa were found only in the URP. In this zone, significantly higher densities of other taxa were observed. The only species with greater abundance in the LLP was Potamothrix hammoniensis (Oligochaeta). Due to the very short water residence time, the differences in the parameters under study between the URP and the LLP of the reservoir were smaller as well as the abundance of the macrozoobenthos was distinctly higher than in other reservoirs.
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Jafari, Naser, Mohamad Nabavi y Moslem Akhavan. "Ecological investigation of zooplankton abundance in the river Haraz, northeast Iran: Impact of environmental variables". Archives of Biological Sciences 63, n.º 3 (2011): 785–98. http://dx.doi.org/10.2298/abs1103785j.
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The influence of physicochemical properties of Haraz river on its zooplankton composition and abundance were investigated at three sites for one year between August 2009 and July 2010. The present study records for the first time the aspects of zooplankton diversity and composition in relation to the physicochemical environment of the Haraz river. Only three groups of zooplankton were found: Rotifera with eighteen genera; Cladocera with nine and Copepoda with six genera. Rotifera was the predominant group (64.89%), followed by Cladocera (19.62%) and Copepoda (15.32%). Upstream, the abundance was 805 individuals/m3, while it varied from 922 to 1126 ind/m3 downstream. Alkaline pH and nutrients were the main environmental factors which affected zooplankton abundance in the river. Site variation in dominance, diversity, evenness and richness were calculated. The study revealed that the presence of certain species, such as Lepadella sp., Mesocyclops sp., Polyarthra sp. and Brachionus sp. is considered to be a biological indicator for eutrophication. The calculated Jack1 values of sites 1 to 3 were 7.624, 16.426 and 19.221, respectively. The Shannon-Wiever species diversity index (H?) values were also different for all the three sites viz., site 1 (1.992), site 2 (1.21) and site 3 (2.48). Simpson?s dominance index (H) value was highest at site 1 (0.692), indicating maximum dominance, whereas at site 3 dominance was the lowest (0.227) and diversity was the highest. Overall, our results showed that changes in the water quality of the river Haraz have considerable effects on the composition of zooplankton assemblages that can potentially affect the functioning of these ecosystems.
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Pociecha, Agnieszka, Agata Z. Wojtal, Ewa Szarek-Gwiazda, Anna Cieplok, Dariusz Ciszewski y Andrzej Kownacki. "Response of Cladocera Fauna to Heavy Metal Pollution, Based on Sediments from Subsidence Ponds Downstream of a Mine Discharge (S. Poland)". Water 11, n.º 4 (18 de abril de 2019): 810. http://dx.doi.org/10.3390/w11040810.
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Mining is recognized to deeply influence invertebrate assemblages in aquatic systems, but different invertebrates respond in different ways to mining cessation. Here, we document the response of the cladoceran assemblage of the Chechło river, S. Poland (southern Poland) to the cessation of Pb-Zn ore mining. The aquatic system includes the river and associated subsidence ponds in the valley. Some ponds were contaminated during the period of mining, which ceased in 2009, while one of the ponds only appeared after mining had stopped. We used Cladocera to reveal how the cessation of mine water discharge reflected on the structure and density of organisms. A total of 20 Cladocera taxa were identified in the sediment of subsidence ponds. Their density ranged from 0 to 109 ind./1 cm3. The concentrations of Zn, Cd, Cu and Pb were much higher in sediments of the ponds formed during peak mining than in the ponds formed after the closure of the mine. Statistical analysis (CCA) showed that Alonella nana, Alona affinis, Alona sp. and Pleuroxus sp. strongly correlated with pond age and did not tolerate high concentrations of heavy metals (Cu and Cd). This analysis indicated that the rate of water exchange by the river flow and the presence of aquatic plants, affect species composition more than pond age itself.
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Kattan, Gustavo H. y J. William Beltran. "Altitudinal distribution, habitat use, and abundance of Grallaria antpittas in the Central Andes of Colombia". Bird Conservation International 9, n.º 3 (septiembre de 1999): 271–81. http://dx.doi.org/10.1017/s0959270900003452.
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SummaryGrallaria antpittas are a group of little known birds from the understorey of humid forests of the tropical Andes, with several species having very narrow distributions. At Ucumari Regional Park, which protects the Otún River watershed in the Central Andes of Colombia, five species occur sympatrically at 2,400 m, including the recently rediscovered G. milleri, of which this is the only known population. We studied the patterns of altitudinal distribution, habitat use and abundance of the five species in the park. We found altitudinal segregation at a local scale, with two species, G. ruficapilla and G. squamigera, found at lower elevations (1,800–2,500 m) and two other species, G. nuchalis and G. rufocinerea, at higher elevations (2,400–3,000); G. milleri was recorded only in the 2,400–2,600 m range. The five species overlap in the range 2,400–2,600 m, where they occur in three habitats: early regeneration, overgrown alder plantations and 30-year-old forest. There were no differences in density among habitats for any species; the five species used the three habitats in proportion to their occurrence in the landscape. Grallaria milleri had the highest overall density (1.3 ind/ha) while G. squamigera had the lowest density (0.2 ind/ha), and the other three species were intermediate. We estimated 106 individuals of G. milleri in an area of 63 ha, and only seven individuals of G. squamigera. The Otún River watershed concentrates an unusual number of Grallaria antpittas, including three endemic species, and the information presented here is fundamental to any future habitat management plans to ensure the persistence of these populations.
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Islam, MR y MG Azom. "Parameters associated with growth factors of five fish species in the Atrai River, Dinajpur, Bangladesh". Bangladesh Journal of Scientific and Industrial Research 53, n.º 2 (27 de mayo de 2018): 155–60. http://dx.doi.org/10.3329/bjsir.v53i2.36677.
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For evaluation of Fulton’s condition factor (CFf), relative body weight (BWr) and form (a3.0) factor affecting growth, 5 fishes (Aspidoparia jaya, Gagata cenia, G. youssoufi, Salmophasia bacaila and S. phulo) were collected from the Atari River in Dinajpur district of Bangladesh. Significant differences (p < 0.05) were recorded among the values of CFf (0.47-1.56) but not for BWr (79.60- 128.39). Based on CFf values, analysis of similarities (ANOSIM, p < 0.01) revealed that maximum distances (R = 0.9946) were found between G. youssoufi and S. bacaila while lowest (R = 0.2175) between G. cenia and S. phulo. Using two-dimensional nMDS scaling of CFf and BWr, G. youssoufi showed good health condition (CFf = 1.22±0.01; BWr = 100.63±0.79) and were separated (stress = 0.0003) from other fishes. Lowest a3.0 value was noted for S. bacaila (0.004) and highest for G. youssoufi (0.012). Therefore, G. youssoufi showed healthier and former body with more adaptability in this river than those of others. These are the first records for proper management of above mentioned fish species and future research in the near future.Bangladesh J. Sci. Ind. Res.53(2), 155-160, 2018
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Ardiansyah, Mochammad, Agung Suryanto y Haeruddin Haeruddin. "HUBUNGAN KONSENTRASI MINYAK DAN FENOL DENGAN KELIMPAHAN FITOPLANKTON DI SUNGAI ASEM BINATUR, KOTA PEKALONGAN". Management of Aquatic Resources Journal (MAQUARES) 6, n.º 1 (9 de marzo de 2018): 95–102. http://dx.doi.org/10.14710/marj.v6i1.19816.
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ABSTRAKSungai Asem Binatur terletak di Kota Pekalongan, Jawa Tengah. Sungai ini selain menerima limbah domestik juga menjadi objek buangan limbah batik oleh para pelaku industri batik di daerahnya. Kandungan minyak dan fenol yang terdapat pada pembuatan batik ini mengalir menuju ke perairan sungai. Kandungan ini akan berdampak terhadap kelimpahan fitoplankton sebagai indikator kualitas perairan. Penelitian ini dilakukan pada bulan Juli – Agustus 2016 di Sungai Asem Binatur yang bertujuan untuk mengetahui konsentrasi minyak dan fenol, mengetahui kelimpahan dan struktur komunitas fitoplankton dan mengetahui hubungan antara minyak dan fenol dengan kelimpahan fitoplankton. Metode yang digunakan adalah metode survey. Teknik pengambilan sampel air di bagian tengah sungai selanjutnya dianalisis di laboratorium. Hasil penelitian menunjukkan konsentrasi minyak di lokasi penelitian berkisar antara 1,2 – 10,4 mg/l, sedangkan konsentrasi fenol berkisar antara 0,0005 – 1,167 mg/l. Kelimpahan fitoplankton berkisar antara 609 – 1649 ind/l, indeks keanekaragaman (H’) dengan nilai 1,894 – 2,484, indeks dominasi (d) diperoleh nilai 0,125 – 0,224, dan indeks keseragaman (e) dengan nilai 0,717 – 0,846. Tidak terdapat hubungan yang signifikan antara minyak dengan kelimpahan fitoplankton pada taraf kepercayaan 95% dengan nilai koefisien korelasi (r) sebesar 0,585 menunjukkan korelasi cukup. Sedangkan, terdapat hubungan yang signifikan antara fenol dengan kelimpahan fitoplankton dengan nilai korelasi (r) sebesar 0,861 menunjukkan korelasi kuat. Regresi linier berganda digunakan untuk membuktikan hubungan nyata antara minyak dan fenol dengan kelimpahan fitoplankton. Terdapat hubungan nyata dengan kelimpahan fitoplankton hanya pada konsentrasi fenol pada taraf kepercayaan 95% dengan nilai sig = 0,022, sedangkan konsentrasi minyak tidak terdapat hasil yang nyata sehingga dapat diabaikan dengan nilai sig = 0,809. Kata Kunci : Minyak; Fenol; Kelimpahan Fitoplankton; Limbah Batik; Sungai Asem Binatur. ABSTRACTAsem Binatur River is located in Pekalongan City, Central Java. Beside as an effluent of domestic waste, this river also an object to dump batik waste by batik industries nearby. Oil and phenol substance in these batik making flows into the river. These substance are going to cause an effect for the abundance of phytoplankton which is a water quality indicator. This research was done on July – August 2016 in Asem Binatur River and aimed to know oil and phenol substance, the abundance and phytoplankton community structure, also correlation of oil and phenol with the abundance of phytoplankton. Survey methode was used. Water sample which taken in the middle part of the river was analyzed. The result shown that oil concentration in the research location was around 1,2 – 10,4 mg/l, meanwhile phenol concentration was around 0,0005 – 1,167 mg/l. The abundance of phytoplankton was around 609 – 1649 ind/l, diversity index (H’) with 1,894 – 2,484 value, domination index value was 0,125 – 0,224, and uniformity index (e) with 0,717 – 0,846 value. There is no significant relation between oil and the abundance of phytoplankton at 95% trust level with correlation value (r) 0,585 which is an enough correlation. Meanwhile, there is a significant correlation between phenol and the abundance of phytoplankton with correlation value (r) 0,861 which is a strong correlation. Double linier regretion was used to prove real correlation between phenol and oil with the abundance of phytoplankton. There is a real correlation with the abundance of phytoplankton but only in phenol concentration at 95% trust level with sig value = 0,022 while oil concentration did not have real result and could be ignored with sig value = 0,809. Keywords: Oil; Phenol; The Abundance of Phytoplankton; Batik Waste; Asem Binatur River.
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Akter, MM, MG Azom, MS Reza Sabuz, MH Islam y MR Islam. "Sexual dimorphism of Canthophrys gongota (Teleostei: Cobitidae) using landmark-based geometric morphometrics in the Atrai river of Bangladesh". Bangladesh Journal of Scientific and Industrial Research 54, n.º 2 (1 de junio de 2019): 187–94. http://dx.doi.org/10.3329/bjsir.v54i2.41676.
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Studies on sexual dimorphism of gongota Loach Canthophrys gongota (Local name: Pahari Gutum) was performed capturing them from the Atrai River of Dinajpur district in Bangladesh. Females had light blotches and patches with thick and rounded pectoral and pelvic fins while males having dark blotches and patches with thin and comparatively pointed paired fins. Body size, lengths of the anal fin and distances between the bases of pectoral, pelvic and caudal fins were significantly different (5.62 < F < 11.65, P ˂ 0.05) between the sexes of C. gongota. The expansion factors of mean thin-plate grids and vectors also showed that the head region of males was statistically different from females, whereas abdomen and tail of the females were considerably broader than those of the males. Both PCA (principal component analysis) and DFA (discriminant function analysis) plots showed morphologically little overlapping of landmark points which discriminated the females from the males. These findings are the first records on the sexual dimorphism of this rare species that would be baseline in a future study.
Bangladesh J. Sci. Ind. Res.54(2), 187-194, 2019
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Syafrizal, Irvina Nurrachmi y Efriyeldi Efriyeldi. "RELATIONSHIP OF NITRATE AND PHOSPHATE CONCENTRATION ON PHYTOPLANKTON PRIMARY PRODUCTIVITY IN DUMAI RIVERS OF RIAU PROVINCE". Asian Journal of Aquatic Sciences 4, n.º 1 (7 de abril de 2021): 54–64. http://dx.doi.org/10.31258/ajoas.4.1.54-64.
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This research was conducted in January 2020 in the waters of the Sembilan Dumai River which aims to determine the concentration of nitrate and phosphate on the primary productivity of phytoplankton. The research method used in this research is the survey method while the determination of the research station was done by technic purposive sampling. The results showed that the average nitrate concentration ranged from 0.0194 - 0.0749 mg/l and the average phosphate concentration ranged from 0.1452 - 0.8502 mg/l. There are 6 classes of phytoplankton found in the waters of the Sembilan Dumai River, namely Bacillariophyceae, Cocinodiscophyceae, Chroococcophyceae, Cyanophyceae, Cyanobacteria and Xanthophyceae. The results of phytoplankton abundance calculations ranged from 74.07 - 280.09 Ind/L. The primary productivity value of phytoplankton for gross primary productivity ranged from 62.5 - 104.16 mgC/m2/jam, respiration values ranged from 20.83 - 41.66 mgC/m2/jam and the net primary productivity value ranged from 41.67 - 72.91 mgC/m2/jam. The results of the multiple linear regression test for the relationship between nitrate and phosphate on the primary productivity of phytoplankton at each station are shown by the mathematical equation Y = 60.18 + (-233,19,35) x and Y = 60.18 + 30.44x with the coefficient of determination ( R2) = 0.140 and (R2) = 0.226 and the correlation coefficient (r) = 0.631, the mathematical equation states that the relationship between nitrate and phosphate on the primary productivity of phytoplankton is strong.
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Amalia, Sholihat, Djumanto Djumanto y Namastra Probosunu. "Komunitas Krustasea di Kawasan Mangrove Desa Jangkaran Kabupaten Kulon Progo". Jurnal Perikanan Universitas Gadjah Mada 19, n.º 2 (10 de mayo de 2017): 79. http://dx.doi.org/10.22146/jfs.26968.
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The objective of this study was to determine the diversity and abundance of krustaseans in the mangrove area of Jangkaran Village, Temon District, Kulon Progo Regency. Sampling was done bi-weekly from October 2016 to February 2017 on six stations defined by ecological character. Krustasean sampling was done using cest net, trap net and hand picking along the river with the extent of each collection station about 10 m2. The captured krustasean samples were cleaned, stored in ice-cooled boxes and transported to the laboratories to be identified and grouped according to species, then measured by carapace length and individual weight. Observation of aquatic environment was done by measuring temperature, brightness, water depth, current velocity, pH, salinity, dissolved oxygen, and substrate type. The results of the observation obtained 1 order, 7 families, and 26 species. The family krustaseans found were Coenobitidae, Diogenidae, Grapsidae, Ocypodidae, Palaemonoidae, Penaeidae, and Portunidae. The most dominant species of krustaseans were white shrimp (Penaeus merguiensis) as much as 25.06%, hermit crab (Clibanarius sp.) as much as 10.85%, and Uca annulipes as much as 10.59%. The fewest species of krustaseans found were Varuna yui of 0.13% and Ocypode sp. as much as 0.26%. The abundance value was 25.4 ind / m2, indices of diversity 2.60, richess index 0.87 and index of dominance 0.18.
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Affek, Andrzej N., Edyta Regulska, Ewa Kołaczkowska, Anna Kowalska y Katarzyna Affek. "Pollination Potential of Riparian Hardwood Forests—A Multifaceted Field-Based Assessment in the Vistula Valley, Poland". Forests 12, n.º 7 (12 de julio de 2021): 907. http://dx.doi.org/10.3390/f12070907.
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Riparian forests with oaks, ashes and elms, now highly fragmented and rare in Europe, are considered hotspots for ecosystem services. However, their capacity to provide pollination seems to be quite low, although reports from in-situ research supporting this view are scarce. Our goal was therefore to thoroughly assess their pollination potential based on multifaceted field measurements. For this, we selected six test sites with well-developed riparian hardwood forests, located in the agricultural landscape along the middle Vistula River in Poland. We used seven indicators relating to habitat suitability (nesting sites and floral resources) and pollinator abundance (bumblebees and other Apoidea) and propose a threshold value (AdjMax) based on value distribution and Hampel’s test to indicate the level of pollination potential for this type of riparian forest. The obtained AdjMax for bumblebee density was 500 ind. ha−1, for Apoidea abundance—0.42 ind. day−1, while for nectar resources—200 kg ha−1. We demonstrate that the investigated small patches of the riparian hardwood forest have a higher pollination potential than reported earlier for riparian and other broadleaved temperate forests, but the indicators were inconsistent. As forest islands in the agricultural landscape, riparian hardwood forests play an important role in maintaining the diversity and abundance of wild pollinators, especially in early spring when there is still no food base available elsewhere.
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Kadarsah, Anang, Cynthia Agustina Ekaputri y Abdul Gafur. "Study of Molluscs Diversity as Ecosystem Engineer from Beach of Sungai Bakau Village, Tanah Laut, South Kalimantan". Indonesian Journal of Biotechnology and Biodiversity 4, n.º 2 (29 de diciembre de 2020): 77–88. http://dx.doi.org/10.47007/ijobb.v4i2.65.
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Molluscs are engineered biota that play an important role in changing the structure and function of ecosystems, including coastal and mangroves. This study aims to record the diversity of molluscs as a group of engineers in coastal areas in Sungai Bakau Village, Tanah Laut, South Kalimantan. Purposive random sampling method was used to obtain mollusc data at three observation stations (Station 1 : sandy beaches, Station 2 : rocky beaches, and Station 3 : river estuaries). Only one type of bivalve was found (Meretirix meretrix) and 13 types of gastropods (Nassarius Sp., Turricula javana, Cerithidea alata, Polygona angulate, Distorsio decipiens, Latirus pictus, Bursa granularis, Latirus sp., Littorina undulate, Naticarius hebraeus, Murex. elenensis, Neverita didyma, and Turritella terebra). The highest diversity index (1.95) was found at station 1. While the evenness index is 0.755. Similarity index was 92.85% (stations 1-2 and stations 1-3) while at stations 2-3 was 85.71%. The highest density of Cerithidea alata is reached 2,996,700 ind/Ha and the least was Turritella terebra (20,000 ind/Ha). Water parameters between observation stations were close to each other : pH ± 7.6 - 7.7, temperature ± 29.3 - 29.7 0C, and salinity ± 34.9 - 35.4 ppt. The difference between research stations can be seen from sediment content. Station 1 has the highest sand content (96.2%). Station 2 consists of 64.7% sand dust and 20.6% clay. Station 3 has the highest dust content, reaching 84.6%. The types and presence of mollusks (bivalves and gastropods) at each research station is vary in value.
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Ardi, Helmi, Siti Rudiyanti y Bambang Sulardiono. "HUBUNGAN LOGAM BERAT TIMBAL (Pb) DAN KADMIUM (Cd) TERLARUT DENGAN KELIMPAHAN FITOPLANKTON DI SUNGAI SILANDAK SEMARANG". Management of Aquatic Resources Journal (MAQUARES) 5, n.º 4 (5 de enero de 2017): 388–97. http://dx.doi.org/10.14710/marj.v5i4.14639.
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ABSTRAK Sungai Silandak terletak di Kota Semarang, Jawa Tengah. Sungai ini menerima limbah yang berasal dari kegiatan industri plastik yang dialirkan ke perairan, dan juga menerima aliran limbah rumah tangga serta terdapat banyak sarana transportasi air di bagian muara sungai.Limbah yang berasal dari industri tersebut mengandung logam berat timbal dan kadmium.Penelitian dilakukan pada bulan April 2016 – Mei 2016 di Sungai Silandak yang bertujuan untuk mengetahui konsentrasi kadmium dan timbal, mengetahui kelimpahan danstruktur komunitas fitoplankton, dan mengetahui hubungan kadmium dan timbal dengan kelimpahan fitoplankton. Metode penelitian yang digunakan adalah metode survei dengan teknik samplingpurposive sampling. Hasil penelitian menunjukkan konsentrasi kadmium di lokasi penelitian berkisar antara 0,0007 - 0,001 mg/l, sedangkan konsentrasi timbalberkisar antara 0,002 - 0,007 mg/l. Kelimpahan fitoplankton berkisar antara 1826 - 6730 ind/l, indeks keanekaragaman (H’) dengan angka 1.747 – 2.828, Indeks dominasi (d) diperoleh hasil dengan angka 0.077 – 0.284, dan indeks keseragaman (e) dengan angka 0.645 – 0.890. Tidak ada hubungan yang signifikan antara kadmium dengan kelimpahan fitoplankton dengan angka koefisien korelasi (r) sebesar 0.179 menunjukkan korelasi lemah.Tidak ada hubungan yang signifikan antara logam berat timbal dengan kelimpahan fitoplankton, diperoleh angka koefisien korelasi (r) sebesar 0.261 menunjukkan korelasi lemah.PCA (Principle Component Analysis) digunakan untuk mengetahui hubungan kadmium dan timbal dengan kelimpahan genera fitoplankton. Terdapat hubungan signifikan logam berat timbal dengan kelimpahan genus Dyctyocha sp dan Bacteriastrum sp di level 0.05 dari rentang kepercayaan 95 %, korelasi kuat negatif dengan koefisien korelasi -0.68. Kata Kunci :Kadmium; Cd; Timbal; Pb; Kelimpahan Fitoplankton;Logam Berat; SungaiSilandak. ABSTRACT Silandak river is located in Semarang, Central Java. This river is suspect to receiving waste came from plastic industry activity which is streamed to the water, and also receiving household waste stream and there are plenty of water transportation in the section of the estuary. Waste from the industry is suspected contain heavy metals cadmium and lead.The study was conducted in April 2016 - May 2016 in the River of Silandak which aimed to determine the concentration of cadmium and lead, to determine the abundance and the phytoplankton community structure, and to determine the correlation of cadmium and lead with the abundance of phytoplankton. The study used survey method with purposive sampling technique. The results showed the concentration of cadmium in the study locations was within the range of 0.0007 to 0.001 mg/l, while the concentration of lead was within the range of 0.002 to 0.007 mg/l. The abundance of phytoplankton ranged between 1826 - 6730 ind/l, the rate of diversity index (H’) was within the range of1.747 - 2.828, the dominance index (d) obtained results within the rate of 0.077 - 0.284, and evenness index (e) within the rate of 0.645 - 0.890. There was no significant correlation between cadmium with the abundance of phytoplankton with a correlation coefficient (r) of 0.179 which means weak correlations. There was no significant correlation between the heavy metals lead with the abundance of phytoplankton, the rate of the correlation coefficient (r) of 0.261 which means weak correlations. PCA (Principle Component Analysis) is used to determine the correlation cadmium and lead with the abundance of phytoplankton genus. There was a significant correlations of heavy metals lead with the abundance Dyctyocha sp and Bacteriastrum sp genus at 0.05 levels the range of 95%, a strong negative correlation with a correlation coefficient of -0.68. Keywords: Cadmium; Cd; Lead; Pb;Phytoplankton Abundance; Heavy Metal;Silandak River.
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Alam, MJ, Y. Daoxian, S. Yachuan, YJ Jiang, ME Quayum y LJ Cheng. "Hexachloro benzene in the Nanshan Karst systems, China". Bangladesh Journal of Scientific and Industrial Research 50, n.º 2 (30 de julio de 2015): 109–16. http://dx.doi.org/10.3329/bjsir.v50i2.24351.
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Karst areas have much higher ecological vulnerability and are easy to be contaminated with hexachlorinated benzene (HCB) which is introduced as health risk pollutants. HCB concentrations were used to understand the transport of HCB conducted in the Nanshan karst system, China. Water, sediments from the underground river and water, sediments and soil from the surface systems were collected monthly in 2011 - 2012 and HCB were analyzed. The levels of HCB were 19.9 ng L-1 in underground waters and 11.6 ng g-1 in underground sediments while 99.1 ng L-1 in surface waters and 110.5 ng g-1 in surface sediments and 2.8 ng g-1 in soils. Seasonal variations were found in concentrations of HCB both in the waters and the sediments. HCB concentrations varied from 7.8 ng L-1 in winter to 86.9 ng L-1 in spring in the groundwaters and 0.3 ng g-1 in autumn to 36.7 ng g-1 in spring in the underground sediments. HCB concentrations varied from 38.6 ng L-1 in autumn to 1019.8 ng L-1 in spring in the surface waters, 0.7 ng g-1 in autumn to 133.4 ng g-1 in spring in the surface sediments and 2.5 ng g-1 in autumn to 17.4 ng g-1 in winter in soil. The substantial seasonal variation found between underground system and surface system which indicate that the surface systems play major role for the transport and contamination of HCB in the underground river systems due to karst features.Bangladesh J. Sci. Ind. Res. 50(2), 109-116, 2015
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Widyarini, Happy, Niken T. M. Pratiwi y Sulistiono. "ZOOPLANKTON COMMUNITY STRUCTURE AT MAJAKERTA ESTUARY AND ITS SURROUNDING WATERS, INDRAMAYU REGENCY, WEST JAVA PROVINCE". Jurnal Ilmu dan Teknologi Kelautan Tropis 9, n.º 1 (5 de septiembre de 2017): 91. http://dx.doi.org/10.28930/jitkt.v9i1.17919.
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<p><em>Majakerta estuary </em><em>and its surrounding waters </em><em>ha</em><em>ve a high </em><em>potential fishery resource </em><em>which</em><em> is </em><em>commonly </em><em>utilized by the community</em><em> around the area</em><em>. Fluctuation of</em><em> physical and chemical parameters of the waters and fishery activities around the estuary can influence the existenc</em><em>e</em><em> of zooplankton</em><em>. This study was conducted from December 2014 to May 2015. Sampl</em><em>es</em><em> of </em><em>the </em><em>zooplankton w</em><em>ere</em><em> collected monthly at </em><em>four</em><em> station</em><em>s </em>(<em>consisted of sea, river and estuary areas</em>)<em>. Based </em><em>o</em><em>n the </em><em>study</em><em>, zooplankton in the Majakerta estuary </em><em>and its surrounding waters </em><em>consist</em><em>ed</em><em> of six classes; i.e. Protozoa (11 genera), Crustaceae (4 genera, 1 nauplius stadia), and Rotifera (4 genera). </em><em>A higher abundance was found at the sea (29025 ind./m<sup>3</sup>), while a lower abundance was at the river and estuary (7147 ind./m<sup>3</sup> dan 7582 ind./m<sup>3</sup>). </em><em>Based on the zooplankton diversity index, it</em><em> can be inferred that the value was relatively low. There were two habitat groups, namely Station Group 1 </em><em>(Station 1 and </em><em> 2</em><em>; </em><em>river</em><em> and</em><em> estuary) and </em><em>Station Group 2 (S</em><em>tation 3 </em><em>and </em><em>4</em><em>; </em><em>sea) w</em><em>ith </em><em>influencing parameters</em><em> </em><em>such as </em><em> </em><em>transparency</em><em>, pH, and salinity. </em></p><p><em> </em></p><p><strong><em>Keywords:</em></strong><em> </em><em>e</em><em>stuar</em><em>y</em><em>, Majakerta, </em><em>zoo</em><em>plankton</em><em>,</em><em> community structure</em><em></em></p>
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Peixoto, Juliana Maerschner Aguiar, Bruce Walker Nelson y Florian Wittmann. "Spatial and temporal dynamics of river channel migration and vegetation in central Amazonian white-water floodplains by remote-sensing techniques". Remote Sensing of Environment 113, n.º 10 (octubre de 2009): 2258–66. http://dx.doi.org/10.1016/j.rse.2009.06.015.
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Lanzoni, Mattia, Mattias Gaglio, Anna Gavioli, Elisa Fano y Giuseppe Castaldelli. "Seasonal Variation of Functional Traits in the Fish Community in a Brackish Lagoon of the Po River Delta (Northern Italy)". Water 13, n.º 5 (2 de marzo de 2021): 679. http://dx.doi.org/10.3390/w13050679.
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Brackish lagoons are highly productive systems that support fishing and aquaculture activities with important revenue. At the same time, they function as fundamental habitats for the conservation of a number of species that use lagoons for reproduction and feeding. The present study aims at describing the seasonal structural and functional variations of fish communities in the Fattibello lagoon, a small but important nursery ground of the Po River delta (northern Italy), historically exploited for fishing. The fish community was sampled monthly over a six-years’ period (2009–2014). The results were normalized in catch per unit of effort (CPUE) and are expressed both as individual abundances (ind/CPUE) and biomass (g/CPUE). Higher biodiversity levels were observed in autumn, when both lagoon residents and marine species coexist, and summer, for individual abundances and biomass. Biomass was a better descriptor than individual abundance of the functional use of the lagoon. In autumn, the lagoon resident species increased significantly, while marine feeding ground species decreased. Vice versa, lagoon residents decreased in winter, when the lagoon were mainly used as feeding ground by marine fishes. Marine migrating species were present throughout the whole year. Overall, the lagoon serves as (i) reproduction habitats for different species, as well as habitat for the pre-reproductive period for the European anchovy; (ii) nursery grounds for a number of commercial species; and (iii) habitats for lagoon resident species, supporting them for the whole life cycle. Overall, the results highlight the fundamental conservation role of the lagoon throughout the whole year, and that seasonal structural and functional patterns of fish communities should be carefully considered when seeking to harmonize direct uses, such as fishing and bivalve farming, as well as nature conservation.
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Prianto, Eko, Husnah Husnah y Solekha Aprianti. "KARAKTERISTIK FISIKA KIMIA PERAIRAN DAN STRUKTUR KOMUNITAS ZOOPLANKTON DI ESTUARI SUNGAI BANYUASIN, SUMATERA SELATAN". BAWAL Widya Riset Perikanan Tangkap 3, n.º 3 (7 de febrero de 2017): 149. http://dx.doi.org/10.15578/bawal.3.3.2010.149-157.
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Penelitian ini bertujuan untuk mengetahui kondisi kualitas perairan pasca pembangunan Pelabuhan Tanjung Api-Api dengan mempelajari karakteristik fisika kimia perairan dan struktur komunitas zooplankton. Penelitian tentang kelimpahan dan keanekaragaman jenis zooplankton dilakukan melalui enam titik stasiun pengamatan di muara Sungai Banyuasin pada bulan April sampai Nopember 2009. Contoh air diambil pada kedalaman 1 m dari permukaan air dengan menggunakan kemmerer water sampler dan contoh zooplankton diambil dengan menggunakan ember 50 L pada permukaan perairan. Selanjutnya contoh air disaring dengan menggunakan planktonnet dengan ukuran 25 μm. Hasil analisis kualitas air diperoleh nilai parameter (suhu, pH, NO2, COD, BOD, dan DO) berada dalam ambang batas yang diperbolehkan sesuai dengan Peraturan Pemerintah No.82 Tahun 2001. Nilai parameter padatan tersuspensi (total suspended solids), total dissolvedsolid, amoniak, nitrat, dan fosfat telah melebihi ambang batas lingkungan perairan yang diperbolehkan. Nilai indeks mutu lingkungan perairan menunjukan dalam kondisi tercemar berat. Kelimpahan zooplankton pada tahun 2009 yaitu 2-19 ind/L lebih rendah dari kelimpahan pada tahun 2004 yaitu 5- 34 ind/L sedangkan keanekaragaman jenis pada tahun 2009 mengalami penurunan jika dibandingkan tahun 2004. The aims of this study were to determine water quality conditions after construction of the port of Tanjung Api-Api by studying the physico chemical characteristics of water and zooplankton community structure. Research on zooplankton abundance and species diversity through the six points of observation stations in the estuary of the river Banyuasin in April until November 2009. Water samples taken at a depth of 1 m from water surface water by using a kemmerer water sampler and zooplankton samples were taken by using a bucket about 50 L in the surface. Further water samples were filtered using a plankton net with a size 25 μm. The results of water quality analize obtained that parameter values (temperature, pH, NO2, COD, BOD, and DO) were still in the threshold limit, in accordance with Government Regulation No.82 2001. Value parameters of total suspended solids, total dissolved solid, ammonia, nitrate, and phosphate has exceeded the permissible limit aquatic environment. Value of water environmental quality index showed in heavily polluted conditions. Zooplankton abundance in was 2-19 ind/L lower than the abundance in 2004 of 5-34 ind/L, while species diversity in the year 2009 decreased compared to 2004.
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Ramanda, Okky Aditya, Bambang Sulardiono y Churun Ain. "ANALISA KUALITAS PERAIRAN DITINJAU DARI TINGKAT SAPROBITAS DAN KANDUNGAN KLOROFIL DI MUARA SUNGAI BODRI KENDAL". Management of Aquatic Resources Journal (MAQUARES) 6, n.º 1 (9 de marzo de 2018): 67–76. http://dx.doi.org/10.14710/marj.v6i1.19812.
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ABSTRAK Penelitian ini bertujuan untuk mengetahui nilai saprobitas perairan (SI dan TSI), kandungan klorofil perairan, dan hubungan antara SI, TSI dengan kualitas perairan. Penelitian dilaksanakan pada bulan Agustus 2016 dengan materi yakni sampel air dari Muara Sungai Bodri dan metode deskriptif serta metode pengambilan sampel yakni Purposive Sampling Method. Sampling dilakukan dengan pengulangan waktu yakni pasang dan surut dengan 3 kali pengulangan dengan 4 Stasiun lokasi sampling. Hasil penelitian didapatkan 65 genera dengan 115 spesies yang didominasi oleh Bacillariophyceae seperti Synedra sp., Skeletonema sp., dan Asterionella sp. Kelimpahan fitoplankton tertinggi terjadi pada Stasiun 1 saat surut sebesar 85184 ind/L yang didominasi oleh Synedra ulna. Dari hasil penelitian didapatkan nilai SI pada kisaran 0.75-1.29 yang menyatakan perairan dalam kondisi β-Mesosaprobik hingga β-Mesosaprobik/Oligosaprobik. Sedangkan, untuk TSI didapatkan nilai 0.99-2.56 yang menyatakan perairan dalam kondisi β-Mesosaprobik hingga Oligosaprobik. Hasil pengukuran kadar klorofil-α menunjukkan bahwa klorofil-α pada wilayah di sekitar muara bernilai rendah. Hubungan antara nilai SI dan TSI dengan kualitas perairan menunjukkan nilai positif dengan keeratan lemah pada saat pasang serta nilai positif dan negatif dengan keeratan kuat pada saat surut. Kata Kunci : Muara Sungai Bodri; Klorofil-α; Indeks Saprobik; Tropik Saprobik Indeks ABSTRACT This study aims to determine the value of water saprobity (SI and TSI), chlorophyl-α content and the context of SI, TSI with water quality such as DO, TSS, Nitrate and chlorophyl-α in Bodri River Estuary. This study was conducted in August 2016. The material used in this study is a sample of water taken from Bodri Estuary. The method used in this study is descriptive method with also sampling method is Purposive Sampling. The sampling location consisted by 4 stasions and it done with repetition time of the high and low tide. The result showed 65 genera with 115 species dominated by Bacillariophyceae such as Synedra sp., Skeletonema sp. and Asterionella sp. The highest phytoplankton abundance occurs in Station 1 at low tide at value 85184 ind/L which dominated by Synedra ulna. SI values in the range 0.75-0.29 which states that the water in β-Mesosaprobic to β-Mesosaprobic/Oligosaprobic conditions. While using TSI, it obtained values at range 0.99-2.56 which it states that the water in β-Mesosaprobic to Oligosaprobic conditions. The results of clorophyl-α measurement showed that the chlorophyl-α in the area around the estuary at a low value. The connection between SI and TSI with water quality has a positive value with weak correlaion at high tide and positive and negative value with strong correlation at low tide. Keywords: Bodri River Estuary; Chlorophyl-α; Saprobic Index; Trophic Saprobic Index
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Świątek, Małgorzata. "Climatic changes on Szczecin Seashore and their impact on river flows". Bulletin of Geography. Physical Geography Series 13, n.º 1 (1 de diciembre de 2017): 29–37. http://dx.doi.org/10.1515/bgeo-2017-0011.
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AbstractAn analysis has been made of the variability of temperature and precipitation at stations at Szczecin, Świnoujście, Resko and Kołobrzeg, as well as a study of river flows in the Ina and Rega Rivers in Goleniów, Resko and Trzebiatów, for the years 1955–2014. Data was provided by IMGW-PIB. Correlation and regression methods have been used in this work. Studies have shown that the average annual, spring and summer air temperature on Szczecin Seashore is rising. Precipitation totals remain basically unchanged. They grow a little in July in Świnoujście and in March in Szczecin. No significant changes in river flows occurred in the course of the examined sixty-year period. Flows in the Ina River rose slightly in February and they diminished in the Rega River in October in Resko and in May in Trzebiatów. Long-term variability of river flows is more strongly affected by the variability of precipitation totals than by the variability of air temperature. The variability of flows correlates most strongly with the variability of precipitation totals in March, April and November, while the influence of the preceding month’s precipitation on river flows is evident in all the year.
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Punnarak, Porntep, Pramot Sojisuporn, Hattaya Jitrapat y Ajcharaporn Piumsomboon. "Effect of Flood Disaster and Long Term Changes during 2011 to 2018 on Community Structure of Zooplankton in the Inner Gulf of Thailand". International Journal of Environmental Science and Development 11, n.º 8 (2020): 383–89. http://dx.doi.org/10.18178/ijesd.2020.11.8.1279.
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This study of community structure of zooplankton in the Inner Gulf of Thailand was initiated in late 2011 in response to a major flood disaster event and continued intermittently to 2018. Six cruises with 13-20 replicate stations/cruise, provided data for contour maps of zooplankton, nutrients, water hydrography, pigments and algae; this manuscript utilized this diverse data set to focus on mesozooplankton. Immediately after the flood, November 2011, mesozooplankton communities were dominated by calanoid copepods with contributions of about 78% of the total. This changed in 2012 to 2018 which the proportion of calanoid copepods was decreased while the other zooplankton such as hydromedusae, polychaete larvae, barnacle nauplii, pelagic shrimp (Lucifer sp. and protozoea) and chaetognaths were increased. The density of mesozooplankton varied between 1.70 x 104 to 1.26 x 106 ind./100 m3 with noticeably high densities near the four river mouths that flow into Inner Gulf. Distribution patterns of mesozooplankton emerged that are likely similar to the long-term patterns of this region which effected by water circulation in the Inner Gulf of Thailand. However, high density of zooplankton in November 2012 and October 2017 appeared along the north-eastern coast and may be related to the availability of food (i.g., algae). Zooplankton abundances in the Inner Gulf of Thailand were significantly correlated with environmental parameters mainly temperature, salinity and food supplies as represented by chlorophyll a concentrations.
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Clark, John R. y James N. Moore. "`White River Peach'". HortScience 38, n.º 6 (octubre de 2003): 1257–59. http://dx.doi.org/10.21273/hortsci.38.6.1257.
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HAFSAOUI, I., B. DRAREDJA, R. LASOTA, S. COMO y P. MAGNI. "Population dynamics and secondary production of Donax trunculus (Mollusca, Bivalvia) in the Gulf of Annaba (Northeast Algeria)". Mediterranean Marine Science 17, n.º 3 (16 de noviembre de 2016): 738. http://dx.doi.org/10.12681/mms.1760.
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The population dynamics and secondary production of the wedge clam Donax trunculus were studied in the Gulf of Annaba (Northeast Algeria) monthly for one year at a site close to the Annaba port and the Seybouse river, affected by industrial and agricultural pollution (Sidi Salem), and at a site more distant from major pollution sources, but exploited by fishery (Echatt). The number of individuals (N) was lower at Sidi Salem (36–148 ind m-2) than at Echatt (63–272 ind m-2) in most sampling dates, while the biomass was more variable from one date to another, with no consistent pattern of differences between sites. The condition index (CI), although slightly higher at Sidi Salem than at Echatt, showed at both sites a major increase in March/April, June/July and October, reflecting two main periods of gonads development and increase in the level of stored reserves at the end of the reproductive period. Consistently, the recruitment of D. trunculus ran from April to October with a major peak of abundance in spring and a minor one in early fall. The maximum age of D. trunculus was 3 years and the growth rate was highest in the first year. Annual somatic production (P) was lower at Sidi Salem (0.773 g AFDM m-2 yr-1) than at Echatt (1.262 g AFDM m-2 yr-1), possibly reflecting a lower mean annual biomass at Sidi Salem (1.642 AFDM m-2) than at Echatt (3.046 AFDM m-2), while the annual P/B ratio was similar between the two sites (i.e. 0.471 and 0.414 yr-1, respectively). Lower N and P at Sidi Salem compared to Echatt are consistent with the proximity of Sidi Salem to the industrial port of Annaba and low hydrodynamic conditions which may favor the accumulation of pollutants, such as hydrocarbons. On the other hand, moderate secondary production of D. trunculus at Echatt compared to other Mediterranean sites may be due to excessive harvesting. We suggest that the low secondary production described in this study should be taken into account for the development of sustainable strategies of clam exploitation in the Gulf of Annaba. In particular, effort should be made to reduce land-based pollution and to regulate the collection of D. trunculus according to the life cycle and production potential of this species.
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Oberti, R., M. Boiocchi, N. A. Ball y F. C. Hawthorne. "Fluoro-sodic-ferropedrizite, NaLi2(Fe22+Al2Li)Si8O22F2, a new mineral of the amphibole group from the Sutlug River, Tuva Republic, Russia: description and crystal structure". Mineralogical Magazine 73, n.º 3 (junio de 2009): 487–94. http://dx.doi.org/10.1180/minmag.2009.073.3.487.
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AbstractFluoro-sodic-ferropedrizite, ideally ANaBLi2C()TSi8O22WF2, is a new mineral of the amphibole group from the Sutlug River, Tuva Republic, Russia. It occurs at the endogenic contact of a Li-pegmatite with country rocks near to a diabase dyke and formed by reaction of the pegmatitic melt with the country rock. Fluoro-sodic-ferropedrizite occurs as prismatic to acicular crystals, ranging in length from 0.1–3 cm and widths of up to 50 μm. Crystals occur inparallel to sub-parallel aggregates up to 5 mm across ina matrix of calcite and plagioclase feldspar. Crystals are pale bluish-grey with a greyish-white streak.Fluoro-sodic-ferropedrizite is brittle, has a Mohs hardness of ~6 and a splintery fracture; it is non-fluorescent with perfect {110} cleavage, no observable parting, and has a calculated density of 3.116 g cm–3. In plane-polarized light, it is pleochroic, X = pale purple-grey, Y = light grey, Z = colourless; X ^ a = 71.2º (in β acute), Y || b, Z ^ c = 83.4º (in β obtuse). Fluoro-sodic-ferropedrizite is biaxial positive, α = 1.642(1), β = 1.644(1), γ = 1.652(1); 2V(obs) = 68.0(3)º, 2V(calc) = 56.4º. Fluoro-sodic-ferropedrizite is monoclinic, space group C2/m, a = 9.3720(4) Å, b = 17.6312(8) Å, c = 5.2732(3) Å, β = 102.247(4)º, V = 851.5(2) Å3, Z = 2. The strongest ten X-ray diffraction lines in the powder patternare (d in Å ,(I),(hkl)): 8.146,(10),(110); 2.686,(9),(151); 3.008,(8),(310); 4.430,(7),(021); 2.485,(6),(02); 3.383,(4),(131); 2.876,(3),(51, 11); 2.199,(3),(12); 4.030,(2),(111) and 3.795,(2),(31). Analysis by a combination of electron microprobe and crystal-structure refinement gives SiO2 59.81, Al2O3 12.66, TiO2 0.09, FeO 10.32, MgO 5.56, MnO 0.73, ZnO 0.17, CaO 0.20, Na2O 2.81, Li2O 4.80, F 2.43, H2Ocalc 1.10, sum = 99.65 wt.%. The formula unit, calculated on the basis of 24(O,OH,F) is A(Na0.68)B(Li1.92Na0.05Ca0.03)C() T(Si7.98Al0.02)O22W(F1.03OH0.97). Crystal-structure refinement shows Li to be completely ordered at the M(3) and M(4) sites. Fluoro-sodic-ferropedrizite, ideally ANaBLi2C()TSi8O22WF2, is related to the theoretical end-member ‘sodic-pedrizite’, ANaBLi2C(Mg2Al2Li)TSi8O22W(OH)2, by the substitutions CFe2+ → CMg and WF → W(OH).
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Perrin, Chris J., Laura L. Rempel y Marvin L. Rosenau. "White Sturgeon Spawning Habitat in an Unregulated River: Fraser River, Canada". Transactions of the American Fisheries Society 132, n.º 1 (enero de 2003): 154–65. http://dx.doi.org/10.1577/1548-8659(2003)132<0154:wsshia>2.0.co;2.
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Nguyen, Cong Trang, Anna Vila-Gispert, Xavier D. Quintana, Au Van Hoa, Thanh Phunong Nguyen y Ngoc Ut Vu. "Effects of salinity on species composition of zooplankton on Hau River, Mekong Delta, Vietnam". Annales de Limnologie - International Journal of Limnology 56 (2020): 20. http://dx.doi.org/10.1051/limn/2020018.
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The area surrounding the Hau River is one of the most important aquaculture and fisheries areas in the Mekong Delta, Vietnam. Fish, shrimp farms and fishers rely of the natural zooplankton production in the incoming water to sustain production. Zooplankton samples were collected from July 2017 to June 2018 using a zooplankton net with mesh size of 60 μm at 3 sites on Hau river at Tran De (river mouth), Dai Ngai (midpoint) and Cai Con (farthest salt intrusion area on Hau river). Qualitative and quantitative samples of zooplankton together with salinity level were determined monthly at each sites. The salinity was found to fluctuate from 0 to 20‰ in the study area. A total of 137 zooplankton species were recorded including 26 species of Protozoa (19%), 47 species of Rotifera (34%), 12 species of Cladocera (9%), 44 species of Copepoda (32%) and 8 other taxon (6%). Copepod and rotifer prevailed with high densities (19.9 × 103 ind m−3 and 19.7 × 103 ind m−3, respectively), whereas protozoa and cladocera were less abundant with 6.8 × 103 ind m−3 and 4.9 × 103 ind m−3, respectively. When salinity increased to more than 5, protozoa and copepods were more abundant and reached a peak at 20 with 25.0 × 1036 ind m−3 and 53.0 × 103 ind m−3, respectively. Regression analysis indicated that the density of zooplankton was significantly correlated to salinity variation. Protozoa and copepod were positively correlated with salinity, whereas cladocera and rotifer were negatively correlated with salinity. The impacts of climate change could exacerbate the seasonal fluctuations in salinity and zooplankton composition.
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Et.al, Jaffry Zakaria. "Dynamic and Structure Profiling of Kampar River, Slim River and Sungkai River: White Water Recreation Rivers in the State of Perak, Malaysia". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, n.º 3 (10 de abril de 2021): 428–31. http://dx.doi.org/10.17762/turcomat.v12i3.747.
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In Malaysia, there are many rivers that are being the attraction for white water river activities. Perak, is a state on the west of Peninsular Malaysia has several rivers that are suitable for white water river activities and being among the favourite location for white water river activities enthusiasts. Among the well-known white water rivers in Perak state are Kampar River, Slim River, Sungkai River, Singgor River and Sungai Bernam River. The attraction of a white water river depends on several factors. One of the important factor is the classification of rapid difficulty level. To date, the classification of rapid difficulty level in Malaysia is based on the international standard scale and certified by The International Canoe Federation (ICF). Apart from that, other attraction factors such as river water quality, geographical location, logistics facilities, transportation access, facilities, operator reputations and promotions are among other attraction factors. This present study aims to identify the main attraction factors in the white water rivers in Perak State. Dynamic and structure profiling of the rivers was produced. The white water rivers selected in this study were Kampar River, Slim River and Sungkai River. From the study, Kampar River was identified to be the most preferred river for white water activities compared to Slim River and Sungkai River. Findings from the study was resourceful in the effort of constructing a complete profile of white water rivers structure located in the state of Perak besides promoting white water river activities as a structured recreational tourism activity in Perak.
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McLeod, Curtiss, Larry Hildebrand y Scott McKenzie. "FRASER RIVER WHITE STURGEON MONITORING PROGRAM". Journal of Applied Ichthyology 15, n.º 4-5 (septiembre de 1999): 301–2. http://dx.doi.org/10.1111/j.1439-0426.1999.tb00295.x.
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Daryumi, Daryumi, Sahala Hutabarat y Abdul Ghofar. "KOMPOSISI DAN DISTRIBUSI SPASIAL LARVA IKAN EKONOMIS PENTING DI PERAIRAN ESTUARI BANJIR KANAL TIMUR KOTA SEMARANG". Management of Aquatic Resources Journal (MAQUARES) 5, n.º 3 (20 de diciembre de 2016): 91–97. http://dx.doi.org/10.14710/marj.v5i3.14394.
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ABSTRAK Perairan estuari Banjir Kanal Timur berfungsi sebagai daerah asuhan bagi larva ikan. Daerah estuari bersifat fluktuatif sehingga sifat-sifat fisik, kimia dan biologi bervariasi, pada fase larva ikan sangat menentukan kelangsungan hidup dari spesies ikan maupun populasi. Oleh karena itu, mengetahui keberadaan larva ikan ekonomis penting dapat memberi informasi tentang daerah mana yang dapat digunakan sebagai daerah penangkapan dan daerah mana yang harus dilestarikan. Penelitian dilakukan pada bulan Maret-April 2016 di Muara Banjir Kanal Timur Kota Semarang yang bertujuan untuk mengetahui komposisi dan distribusi spasial larva ikan. Metode yang digunakan yaitu metode Purposive Random Sampling. Hasil penelitian menunjukan jumlah rata-rata larva ikan sebanyak 1851 ind/150m3 terdiri dari famili Apogonidae, Mugilidae, Gerreidae, Lutjanidae, Engraulidae, Nemipteridae, Ambassidae, Gobiidae dan Chanidae. Jenis larva ikan yang yang paling banyak ditemukan adalah Mugillidae (Belanak) 38,92%, sedangkan yang paling sedikit adalah Chanidae (Bandeng) 0,38%. Larva ikan paling banyak tertangkap di daerah pantai (Titik III) dan yang paling sedikit tertangkap didaerah muara menuju sungai (Titik VI). Perhitungan indeks morista menunjukan larva ikan menyebar secara acak. Struktur komunitas larva ikan yaitu indeks keanekaragaman (H’) berkisar 0,64-1,66, indeks keseragaman (E) berkisar 0,14-0,39, dan indeks dominasi berkisar 0,21-0,67. Berdasarkan hasil uji regresi menunjukkan antara salinitas dengan kelimpahan larva ikan berkorelasi positif, sedangkan kecepatan arus dengan kelimpahan larva ikan berkorelasi negatif. Kata Kunci: Estuari; Larva Ikan; Komposisi; Distribusi; Banjir Kanal Timur Semarang. ABSTRACT The estuaries of eastern Banjir Kanal served as the nursery ground for fish larvae. Areas of estuaries were fluctuating. So the parameters of the physical, chemical and biological were variation, in fish larvae phas largely determine survival rate of fish species or populations. For it to, knowing the existence of economically important fish larvae could providing information about which areas be using as a capture area and which areas that should be preserved. Research conducted in March-April 2016 at the Eastern Banjir Kanal of Semarang, aims to find out the composition and spatial distribution of fish larvae. The method used Purposive Random Sampling method. The research showed the range number of larvae as 1851 ind/150m3 consists of Familia Apogonidae, Mugilidae, Gerreidae, Lutjanidae, Engraulidae, Gobiidae, Ambassidae, Nemipteridae and Chanidae. Types of fish larvae found the most high was Mugillidae (Mullet) 38,92%, while the least was Chanidae (Milkfish) 0,38%. The larvae of most fish caught in coastal areas (point III) and the least caught in the estuary towards the river (Point VI). The calculation of the index morista fish larvae spread randomly. Fish larvae community structures were the index of diversity (H ') range from 0,64-1,66, uniformity index (E) range 0,14-0,39, and dominance index range from 0,21-0,67. Based on the results of the regression analysis showed between salinity with an abundance of fish larvae correlating positively, where the current speed with an abundance of fish larvae correlating negatively.Keywords: Estuarie; Fish Larvae; Composition; Distribution; Eastern Banjir Kanal Semarang.
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Webber, P. Aaron, Kevin R. Bestgen y G. Bruce Haines. "Tributary Spawning by Endangered Colorado River Basin Fishes in the White River". North American Journal of Fisheries Management 33, n.º 6 (diciembre de 2013): 1166–71. http://dx.doi.org/10.1080/02755947.2013.829142.
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Harahap, Elisa. "Rasio Jenis Kelamin Udang Galah (Macrobrachium rosenbergii) Pada Kondisi Perairan Sungai Barumun Kabupaten Labuhanbatu Selatan". Konservasi Hayati 16, n.º 2 (30 de octubre de 2020): 85–91. http://dx.doi.org/10.33369/hayati.v16i2.12472.
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This research was conducted in The Barumun River in April-June 2020, Determining 5 research sites using purposive sampling method. The purpose of this study is to find out the abundance of shrimp galah in the water of Barumun River Labuhanbatu Selatan Regency.The Total sample for the study as many as 342 individuals with the value of estimating the abundance ranged between 20-85 ind/m2.The value of the ratio of the sexes prawns found in station 2 with a number of 81 individuals, the number of individual male 18 ind/m2 and of females 30 ind/m2, and the lowest in station 3 with the number of 60 individuals, the number of individual male 24 ind/m2 and begina 18 ind/m2.from the results there can be seen that the amount of shrimp the females are larger than shrimp male. Because of Udang galah (Macrobrachium rosenbergii) males are able to fertilize shrimp females up to five tails in time almost simultaneously.The low Ratio of prawns on the station caused by the amount of people who do a lot of activity so decreasing the population of shrimp in the vicinity of the station, which can hinder the process of the reproduction of prawns. Condition factors of physic-chemical of Barumun River District Labuhanbatu Selatan is still support for the survival of Prawns.
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Ley, Lukas. "Discipline and Drain: River Normalization and Semarang’s Fight against Tidal Flooding". Indonesia 105, n.º 1 (2018): 53–75. http://dx.doi.org/10.1353/ind.2018.0002.
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Maytham, Alaa A. A., Naeem S. Hammadi y Jassim M. Abed. "Environmental Study of Zooplankton in the Middle Part of the Shatt Al-Arab River, Basrah, Iraq". Basrah Journal of Agricultural Sciences 32 (22 de noviembre de 2019): 85–96. http://dx.doi.org/10.37077/25200860.2019.259.
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An environmental study of zooplankton on the Shatt al-Arab River was carried out in two stations from July until November 2018. A total of 34 taxa of zooplankton were recorded in this study, belong to Cladocera, Copepoda and Rotifera. Some species have disappeared and others have emerged during the study period but varying numbers of dominant species found during the search such as Acarocalanus gibber, and recorded in the station 1 in July and station 2 for all months such as cyclopoid nauplii of Copepoda. Water temperature ranged between (19-35) °C station 1 and between (18- 32) °C at station 2, Salinity values fluctuated between (4.05 and 15.42 ‰), (6.47- 12.2 ‰) at stations 1, 2 respectively. pH values ranged was between (7.3 to 7.9) and (7.1 to 8.5) at stations 1 and 2 respectively. Copepoda density ranged between (0.12 to 88.23) ind. l-1 at station 1 and between (0.94 to 69.73) ind. l-1 at station 2. Density of Cladocera fluctuated between (0.06 and 1.45) ind. l-1. Maximum and minimum densities were at station 1. The population density of Rotifera ranged between (0.06 ind. l-1 to 20.44) ind. l-1 at second station.
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Utomo, Agus Djoko y Suslo Adjie. "PENDUGAAN STOK IKAN DI SUNGAI KAPUAS, KALIMANTAN BARAT". Jurnal Penelitian Perikanan Indonesia 15, n.º 1 (1 de febrero de 2017): 33. http://dx.doi.org/10.15578/jppi.15.1.2009.33-48.
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Sungai Kapuas, Kalimantan Barat mempunyai tipe ekosistem yang kompleks dan keanekaragaman jenis ikan tinggi. Sungai Kapuas ini sudah mendapat tekanan dari luar terutama dari pertanian, perkebunan, dan pertambangan. Akibatnya, beberapa jenis ikannya sudah mulai langka antara lain ringo (Datniodes quadrifsciatus), siluk (Scleropags formosus), belantau (Macrochirichthys macrochirus), dan kapas (Rohteichthys microlepis). Suatu kajian stok ikan dengan menggunakan metode akustik dilakukan pada bulan Juli dan Desember 2006 di Sungai Kapuas. Lokasi yang diambil adalah ruas Sungai Kapuas dari Pontianak ke hilir sampai Muara Jungkat, ruas Sungai Kapuas dan ruas anak sungainya sekitar Tayan, ruas anak sungai perairan banjiran di kawasan Sentarum dan satu buah danau sungai mati yaitu Danau Empangau. Untuk mengetahui komposisi jenis ikan, pengambilan contoh ikan dilakukan dan hasil tangkapan dicatat oleh enumerator. Stok ikan di hilir antara Pontianak dan Muara Jungkat adalah 1.847 ind./Ha, di Tayan pada sungai Kapuas dan anak sungainya masing-masing adalah 157 dan 403 ind./Ha, di kawasan Sentarum berkisar 1.087 - 1.634 ind./Ha, dan di Danau Empangau adalah 5.708 ind./Ha. Jenis ikan yang mendominansi di perairan antara Pontianak ke Muara Jungkat yaitu sengarat (Kryptopterus trichopterus) dan baung (Mystus nemurus), di Tayan yaitu kotol mulut (Amblyrhycnchichthys truncatus) dan kelabau (Osteochilus melanopleura), di kawasan Sentarum yaitu bauk (Labiobabrus spp.), sepat (Trichogaster trichopterus), dan toman (Channa micropeltes), serta di Danau Empangau yaitu entukan (Thynnichthys thynnoides), umpan (Puntius waandersii), dan biawan (Helostoma temminckii). Kapuas River, West Kalimantan has various ecosystem types and high fish biodiversity. This river has been pressured by other sectors such as agriculture, plantation, and mining. Some of fish species such as ringo (Datniodes quadrifsciatus), siluk (Scleropags formosus), belantau (Macrochirichthys macrochirus), and kapas (Rohteichthys microlepis) endanger. A study on fish stock assessment using accoustic methods was done on July and December 2006 in Kapuas River. The locations selected in this study were down stream from Pontianak to Muara Jungkat, segment of Kapuas River and its tributary around Tayan area, in segment of Sentarum floodplains (Empangau oxbow lake). Average fish stock in downstream segment was 1,847 ind./Ha, around Tayan in main river and its tributary was 157 ind./Ha and 403, respectively, in Sentarum ranged 1,087 - 1,634 ind./Ha and in Empangau Lake was 5,708 ind./Ha. Fish species dominance from Pontianak to Muara Jungkat was sengarat (Kryptopterus sp.) and baung (Mystus nemurus), in Tayan was kotol mulut (Amblyrhycnchichthys truncatus) and kelabau (Osteochilusmelanopleura), in Sentarum was bauk (Labiobabrus spp.), sepat (Trichogaster trichopterus), and toman (Channa micropeltes), and in Empangau Lake were entukan (Thinnichthys thynnoides), umpan (Puntius waandersii), and biawan (Helostoma temminckii).