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Artículos de revistas sobre el tema "Eutrophic environments"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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1

Kiersztyn, Bartosz, Elsi S. Kauppinen, Tomasz Kaliński, Ryszard Chróst, and Waldemar Siuda. "Quantitative description of respiration processes in meso-eutrophic and eutrophic freshwater environments." Journal of Microbiological Methods 149 (June 2018): 1–8. http://dx.doi.org/10.1016/j.mimet.2018.04.010.

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2

Stoermer, E. F., J. A. Wolin, C. L. Schelske, and D. J. Conley. "Postsettlement Diatom Succession in the Bay of Quinte, Lake Ontario." Canadian Journal of Fisheries and Aquatic Sciences 42, no. 4 (1985): 754–67. http://dx.doi.org/10.1139/f85-097.

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Siliceous algal microfossil assemblages deposited in the Bay of Quinte prior to European settlement consist of low numbers of benthic diatoms and chrysophyte cysts. Early settlement activities are marked by qualitative changes in the flora and small increases in microfossil flux. Events associated with the Ambrosia horizon produced a rapid transition from assemblages characteristic of oligotrophy environments to those characteristic of eutrophic waters and a large increase in microfossil flux. This was followed by a period of decreasing siliceous microfossil flux and reestablishment of less eu

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3

Landa, Giovanni Guimarães, Francisco Antonio Rodrigues Barbosa, Arnola Cecilia Rietzler, and Paulina Maria Maia-Barbosa. "Thermocyclops decipiens (Kiefer, 1929) (Copepoda, Cyclopoida) as indicator of water quality in the State of Minas Gerais, Brazil." Brazilian Archives of Biology and Technology 50, no. 4 (2007): 695–705. http://dx.doi.org/10.1590/s1516-89132007000400015.

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The aim of this work was to study the possible utilization of Thermocyclops decipiens as indicator of the trophic degree and water quality of some watersheds of the state of Minas Gerais. From the beginning of the decade of 90, T. decipiens was recorded in several water collections of the state, including the basins of the rivers Paranaíba, São Francisco, Doce and Grande, within environments mainly of meso and eutrophics characteristics. Of the 28 places of occurrence of the species and according to the water quality index (WQI) used by Environmental Foundation of Minas Gerais (FEAM), 7 of the

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4

Medeiros, Ana Maria Alves de, Cyntya Eustáquio de Sousa, Maria Cristina Crispim, and Ana Karla Araújo Montenegro. "Effects of experimental eutrophization on zooplankton community." Acta Limnologica Brasiliensia 25, no. 2 (2013): 183–91. http://dx.doi.org/10.1590/s2179-975x2013000200009.

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AIMS: The present study evaluated the role that increased nutrient concentrations play on zooplankton community, by employing an experimental laboratory approach. METHODS: Experiments were conducted in the laboratory, where three trophic state conditions were simulated, namely, mesotrophic, eutrophic and hypereutrophic. Each treatment was replicated three times and individuals of Brachionus urceolaris (10 individuals), Hexarthra mira (5) (Rotifera), Latonopsis sp. (10), Moina minuta (10) (Cladocera) and Thermocyclops sp. (5) (Copepoda) were introduced to each replicate. On the first experiment

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5

Jin, Mei-Yan, Jong-Jun Lee, Hye-Ji Oh, et al. "The Response of Catchment Ecosystems in Eutrophic Agricultural Reservoirs to Water Quality Management Using DOM Fluorescence." Sustainability 11, no. 24 (2019): 7207. http://dx.doi.org/10.3390/su11247207.

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Three-dimensional excitation emission matrix (EEM) fluorescence spectroscopy was used to investigate the characteristics of dissolved organic matter (DOM) in five typical eutrophic agricultural reservoirs. Based on catchment ecosystem, the five reservoirs were divided into three pollution sources of livestock, living, and farmland sources. The quantities and qualities of DOM in the reservoirs were analyzed. Our results showed that DOM characteristics were different in eutrophic reservoirs based on source. More protein-like components were observed in the reservoirs with the living sources, whi

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6

SOLDÁNOVÁ, M., A. FALTÝNKOVÁ, T. SCHOLZ, and A. KOSTADINOVA. "Parasites in a man-made landscape: contrasting patterns of trematode flow in a fishpond area in Central Europe." Parasitology 138, no. 6 (2011): 789–807. http://dx.doi.org/10.1017/s0031182011000291.

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SUMMARYWe have explored a large body of novel data focusing on small-scale temporal and spatial patterns in the composition and structure of larval trematode communities inLymnaea stagnalis(L.) from a typical Central European agricultural landscape. The 5 eutrophic fishponds studied provide excellent environments for the development of species-rich and abundant trematode communities. Nine prevalent species were consistently present in component communities, but had differential contribution to the parasite flow in the 5 ponds resulting in significant contrasting patterns of community similarit

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7

Pantano, Glaucia, Josilei S. Ferreira, Francisco W. B. Aquino, Edenir R. Pereira-Filho, Antonio A. Mozeto, and Pedro S. Fadini. "Biosorbent, a promising material for remediation of eutrophic environments: studies in microcosm." Environmental Science and Pollution Research 24, no. 3 (2016): 2685–96. http://dx.doi.org/10.1007/s11356-016-8009-y.

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8

Zeng, Liqing, Fan Yang, Changzhou Yan, and Xinhong Wang. "High-resolution characterization of labile phosphorus, iron, and manganese in sediments of different trophic waters in Lake Taihu, China." Water Science and Technology 77, no. 2 (2017): 286–95. http://dx.doi.org/10.2166/wst.2017.534.

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Abstract High-resolution combined ZrO-Chelex diffusive gradients in thin film (DGT) probes were arranged to synchronously monitor the characteristics of labile phosphorus (P), iron (Fe), and manganese (Mn) in sediments from regions of varying trophic levels in Lake Taihu, China. Results showed that P release was closely related to the lake region's trophic level. Labile P in sediments and the apparent diffusion flux (Fd) of P were higher in hyper-eutrophic algae-dominated regions than those in macrophyte-algae-dominated and macrophyte-dominated regions, indicating that P released from sediment

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9

Paul, John H., Wade H. Jeffrey, Andrew W. David, Mary F. DeFlaun, and Lisa H. Cazares. "Turnover of Extracellular DNA in Eutrophic and Oligotrophic Freshwater Environments of Southwest Florida." Applied and Environmental Microbiology 55, no. 7 (1989): 1823–28. http://dx.doi.org/10.1128/aem.55.7.1823-1828.1989.

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10

Kawasaki, Nobuyuki, Kazuhiro Komatsu, Ayato Kohzu, et al. "Bacterial Contribution to Dissolved Organic Matter in Eutrophic Lake Kasumigaura, Japan." Applied and Environmental Microbiology 79, no. 23 (2013): 7160–68. http://dx.doi.org/10.1128/aem.01504-13.

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ABSTRACTIncubation experiments using filtered waters from Lake Kasumigaura were conducted to examine bacterial contribution to a dissolved organic carbon (DOC) pool. Bacterial abundance, bacterial production, concentrations of DOC, total dissolved amino acids (TDAA), and total dissolved neutral sugars (TDNS) were monitored during the experiments. Bacterial production during the first few days was very high (20 to 35 μg C liter−1day−1), accounting for 40 to 70% of primary production. The total bacterial production accounted for 34 to 55% of the DOC loss during the experiment, indicating high ba

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11

Capblancq, Jacques. "Nutrient dynamics and pelagic food web interactions in oligotrophic and eutrophic environments: an overview." Hydrobiologia 207, no. 1 (1990): 1–14. http://dx.doi.org/10.1007/bf00041435.

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12

Cheng, Haomiao, Ling Cheng, Liang Wang, et al. "Changes of Bacterial Communities in Response to Prolonged Hydrodynamic Disturbances in the Eutrophic Water-Sediment Systems." International Journal of Environmental Research and Public Health 16, no. 20 (2019): 3868. http://dx.doi.org/10.3390/ijerph16203868.

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The effects of hydrodynamic disturbances on the bacterial communities in eutrophic aquatic environments remain poorly understood, despite their importance to ecological evaluation and remediation. This study investigated the evolution of bacterial communities in the water–sediment systems under the influence of three typical velocity conditions with the timescale of 5 weeks. The results demonstrated that higher bacterial diversity and notable differences were detected in sediment compared to water using the 16S rRNA gene sequencing. The phyla Firmicutes and γ-Proteobacteria survived better in

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13

FUKAMI, KIMIO, USCHAREE RUANGDEJ, ARUN B. PATEL, and TOSHITAKA NISHIJIMA. "Improvement of eutrophic coastal bottom environments by using an optical fiber and effective psychrophilic bacteria." Fisheries science 68, sup1 (2002): 617–20. http://dx.doi.org/10.2331/fishsci.68.sup1_617.

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14

Billen, Gilles, Pierre Servais, and Sylvie Becquevort. "Dynamics of bacterioplankton in oligotrophic and eutrophic aquatic environments: bottom-up or top-down control?" Hydrobiologia 207, no. 1 (1990): 37–42. http://dx.doi.org/10.1007/bf00041438.

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15

Wei, Lili, Shuh-Ji Kao, and Chaoxiang Liu. "Mangrove species maintains constant nutrient resorption efficiency under eutrophic conditions." Journal of Tropical Ecology 36, no. 1 (2019): 36–38. http://dx.doi.org/10.1017/s0266467419000336.

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AbstractMangrove species have developed nutrient conservation mechanisms to adapt to oligotrophic intertidal environments. However, nutrient enrichment occurs worldwide, particularly in estuarine and coastal regions. Mangrove species may change their adaptive strategies if nutrient availability increases substantially. To understand how nutrient resorption (a major nutrient conservation strategy) responds to nutrient enrichment, a common mangrove species in China, Aegiceras corniculatum (black mangrove), was selected, and saplings were cultivated in nutrient-enriched soils. After one year, nei

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16

Santana, L. M., M. E. B. Moraes, D. M. L. Silva, and C. Ferragut. "Spatial and temporal variation of phytoplankton in a tropical eutrophic river." Brazilian Journal of Biology 76, no. 3 (2016): 600–610. http://dx.doi.org/10.1590/1519-6984.18914.

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Abstract This study aims to evaluate the environmental factors determining of the changes in phytoplankton structure in spatial (upper, middle and lower course) and seasonal (dry and rainy period) scales in a eutrophic river (Almada River, northeastern Brazil). In the study period, total accumulated rainfall was below of the historic average, resulting in flow reduction, mainly in rainy period. High orthophosphate concentration was found at the sampling sites. Phytoplankton chlorophyll a increased from upstream to downstream. Geitlerinema splendidum (S1) and Chlamydomonas sp. (X2) were the mos

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17

Rangel, LM, LHS Silva, MS Arcifa, and A. Perticarrari. "Driving forces of the diel distribution of phytoplankton functional groups in a shallow tropical lake (Lake Monte Alegre, Southeast Brazil)." Brazilian Journal of Biology 69, no. 1 (2009): 75–85. http://dx.doi.org/10.1590/s1519-69842009000100009.

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Phytoplankton vertical and diel dynamics in a small shallow lake (Lake Monte Alegre, Ribeirão Preto, state of São Paulo) were investigated in two climatological periods: July 2001 (cool-dry season) and March 2002 (warm-rainy season). Monte Alegre is a eutrophic reservoir, with a warm polymictic discontinuous circulation pattern. The lake was thermally stratified in both periods, although dissolved oxygen varied less in the cool-dry period. Phytoplankton biomass was higher in the warm-rainy season and the vertical distribution was stratified in both seasons. Flagellate groups (Lm, Y, W1 and W2)

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18

Moura, Meirielle Euripa Pádua de, Lorraine Dos Santos Rocha, and João Carlos Nabout. "Effects of global climate change on chlorophyll-a concentrations in a tropical aquatic system during a cyanobacterial bloom: a microcosm study." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 12, no. 3 (2017): 390. http://dx.doi.org/10.4136/ambi-agua.2014.

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Recent studies have investigated the impact of climate change on aquatic environments, and Chlorophyll-a (Chl-a) concentration is a quick and reliable variable for monitoring such changes. This study evaluated the impact of rainfall frequency as a diluting agent and the effect of increased temperature on Chl-a concentrations in eutrophic environments during a bloom of cyanobacteria. This was based on the hypothesis that the concentration of Chl-a will be higher in treatments in which the rainfall frequency is not homogeneous and that warmer temperatures predicted due to climate change should f

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19

Minamoto, Toshifumi, Mie N. Honjo, and Zen'ichiro Kawabata. "Seasonal Distribution of Cyprinid Herpesvirus 3 in Lake Biwa, Japan." Applied and Environmental Microbiology 75, no. 21 (2009): 6900–6904. http://dx.doi.org/10.1128/aem.01411-09.

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ABSTRACT The seasonal distribution of the cyprinid herpesvirus 3 (CyHV-3) in Lake Biwa, Japan, was investigated. CyHV-3 was distributed all over the lake 5 years after the first outbreak. The mean concentration of CyHV-3 in water showed annual oscillation, with a peak in the summer and a trough in winter. Our results suggested that CyHV-3 is present at high density in reductive environments, such as reed zones and turbid or eutrophic water.

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20

Genitsaris, Savvas. "Biodiversity of Marine Microbes." Diversity 12, no. 6 (2020): 247. http://dx.doi.org/10.3390/d12060247.

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The Special Issue entitled “Biodiversity of Marine Microbes” aimed at highlighting the significance of marine microbes as primary producers, their participation in complex processes and interactions with both the biotic and the abiotic environment, and their important roles in biogeochemical cycles and ecosystem functioning. The issue includes five research papers, covering the diversity and composition of marine microbial communities representing all three domains of life in various marine environments, including coastal eutrophic areas, ice waters, and lagoons. One paper examined the diversi

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21

Dimiza, M. D., and M. V. Triantaphyllou. "COMPARING LIVING AND HOLOCENE COCCOLITHOPHORE ASSEMBLAGES IN THE AEGEAN MARINE ENVIRONMENTS." Bulletin of the Geological Society of Greece 43, no. 2 (2017): 602. http://dx.doi.org/10.12681/bgsg.11222.

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Detailed quantitative analyses of coccolithophores performed on the shallow deposits of the southeastern Aegean region (core NS-14, 505 m depth), evidenced that the distribution of calcare-ous nannoplankton assemblages during the last 13 ka BP reflects paleoenvironmental changes which are directly related to parameters such as temperature, salinity, productivity and nutrient flux in the water column. Analysis enabled the separation of the assemblages in four groups. Group A consists of Emiliania huxleyi and the subtropical species Syracosphaera spp. and Rhabdosphaera clavigera, Group B is comp

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22

Cai, Jian, Chengrong Bai, Xiangming Tang, et al. "Spatiotemporal Variations in Seston C:N:P Stoichiometry in a Large Eutrophic Floodplain Lake (Lake Taihu): Do the Sources of Seston Explain Stoichiometric Flexibility?" Water 12, no. 1 (2019): 36. http://dx.doi.org/10.3390/w12010036.

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Although sources of seston are much more complicated in lakes compared to oceans, the influences of different sources on the spatiotemporal variations in seston stoichiometry are still underexplored, especially in large eutrophic floodplain lakes. Here, we investigated seston stoichiometric ratios across a typical large eutrophic floodplain lake (Lake Taihu, East China) over one year. In addition, we used the n-alkane proxies to examine the influence of the seston source on seston stoichiometry variation. Throughout the study, the average value of the C:N:P ratio of 143:19:1 across Lake Taihu

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23

Rudmin, Maxim, Aleksey Ruban, Oleg Savichev, Aleksey Mazurov, Aigerim Dauletova, and Olesya Savinova. "Authigenic and Detrital Minerals in Peat Environment of Vasyugan Swamp, Western Siberia." Minerals 8, no. 11 (2018): 500. http://dx.doi.org/10.3390/min8110500.

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Studies of mineral-forming processes in modern peat bogs can shed light on metal concentrations and their cycling in similar environments, especially in geological paleoanalogs. In terms of the mineralogical and geochemical evolution of peat bog environments, the Vasyugan Swamp in Western Siberia is a unique scientific object. Twelve peat samples were collected from the Vasyugan Swamp up to the depth of 275 cm at 25 cm intervals. The studied peat deposit section is represented by oligotrophic (0–100 cm), mesotrophic (100–175 cm), and eutrophic (175–275 cm) peat, and this is underlain by basal

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24

Ou, Huilong, Mingyu Li, Shufei Wu, Linli Jia, Russell T. Hill, and Jing Zhao. "Characteristic Microbiomes Correlate with Polyphosphate Accumulation of Marine Sponges in South China Sea Areas." Microorganisms 8, no. 1 (2019): 63. http://dx.doi.org/10.3390/microorganisms8010063.

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Some sponges have been shown to accumulate abundant phosphorus in the form of polyphosphate (polyP) granules even in waters where phosphorus is present at low concentrations. But the polyP accumulation occurring in sponges and their symbiotic bacteria have been little studied. The amounts of polyP exhibited significant differences in twelve sponges from marine environments with high or low dissolved inorganic phosphorus (DIP) concentrations which were quantified by spectral analysis, even though in the same sponge genus, e.g., Mycale sp. or Callyspongia sp. PolyP enrichment rates of sponges in

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25

Wan, Yu, Xiaohong Ruan, Jie Wang, and Xiaojun Shi. "Spatial and Seasonal Variations in the Abundance of Nitrogen-Transforming Genes and the Microbial Community Structure in Freshwater Lakes with Different Trophic Statuses." International Journal of Environmental Research and Public Health 16, no. 13 (2019): 2298. http://dx.doi.org/10.3390/ijerph16132298.

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Identifying nitrogen-transforming genes and the microbial community in the lacustrine sedimentary environment is critical for revealing nitrogen cycle processes in eutrophic lakes. In this study, we examined the diversity and abundance of ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), denitrifying bacteria (DNB), and anammox bacteria (AAOB) in different trophic status regions of Lake Taihu using the amoA, Arch-amoA, nirS, and hzo genes as functional markers. Quantitative Polymerase Chain Reaction (qPCR) results indicated that the abundance of the nirS gene was the highest,

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26

Melo-Magalhães, EM, PRP Medeiros, MCA Lira, ML Koening, and AN Moura. "Determination of eutrophic areas in Mundaú/Manguaba lagoons, Alagoas-Brazil, through studies of the phytoplanktonic community." Brazilian Journal of Biology 69, no. 2 (2009): 271–80. http://dx.doi.org/10.1590/s1519-69842009000200006.

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Mundaú and Manguaba Lagoons (9° 34' 38"-9° 45' 30" S and 35° 44' 00"-35° 58' 13" W) are considered the largest and most productive ones in the state of Alagoas and were studied with the purpose of identifying the existence of anthropic impacts. Samples were collected at 8 stations, during low tide and flooding in rainy and dry periods, using the "Van Dorn" bottle and plankton net. In total, 155 taxons were identified, with special emphasis on Bacillariophyta and Cyanophyta divisions. The most abundant species in Mundaú Lagoon was Skeletonema cf. costatum, and in the Manguaba Lagoon, Cyclotella

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27

RIETZLER, A. C., T. MATSUMURA-TUNDISI, and J. G. TUNDISI. "Life cycle, feeding and adaptive strategy implications on the co-occurrence of Argyrodiaptomus furcatus and Notodiaptomus iheringi in Lobo-Broa Reservoir (SP, Brazil)." Brazilian Journal of Biology 62, no. 1 (2002): 93–105. http://dx.doi.org/10.1590/s1519-69842002000100012.

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The population dynamics, life cycle and feeding of Argyrodiaptomus furcatus and Notodiaptomus iheringi, were studied in Broa reservoir from August 1988 to August 1989, period when a replacement of A. furcatus by N. iheringi was observed. Some abiotic factors such as temperature, dissolved oxygen, pH and conductivity were measured to characterize the limnological conditions of the reservoir. Also, phytoplankton composition was analyzed and related to the feeding of the two species. Experimental data on developmental time and reproduction of A. furcatus and N. iheringi under different temperatur

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28

Bongiorni, Lucia, Mirko Magagnini, Monica Armeni, Rachel Noble, and Roberto Danovaro. "Viral Production, Decay Rates, and Life Strategies along a Trophic Gradient in the North Adriatic Sea." Applied and Environmental Microbiology 71, no. 11 (2005): 6644–50. http://dx.doi.org/10.1128/aem.71.11.6644-6650.2005.

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ABSTRACT Although the relationships between trophic conditions and viral dynamics have been widely explored in different pelagic environments, there have been few attempts at independent estimates of both viral production and decay. In this study, we investigated factors controlling the balance between viral production and decay along a trophic gradient in the north Adriatic basin, providing independent estimates of these variables and determining the relative importance of nanoflagellate grazing and viral life strategies. Increasing trophic conditions induced an increase of bacterioplankton g

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29

Santos, CM, and EM Eskinazi-Sant'Anna. "The introduced snail Melanoides Tuberculatus (Muller, 1774) (Mollusca: Thiaridae) in aquatic ecosystems of the Brazilian Semiarid Northeast (Piranhas-Assu River basin, State of Rio Grande do Norte)." Brazilian Journal of Biology 70, no. 1 (2010): 1–7. http://dx.doi.org/10.1590/s1519-69842010000100003.

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Records of the gastropod Melanoides tuberculatus (Müller, 1774), family Thiaridae, in the Piranhas-Assu River basin in Rio Grande do Norte reveal the dispersal of this native Southeast Asian and East African species into aquatic environments of the Brazilian semiarid region, including artificial environments (reservoirs) and lotic systems. The eutrophic conditions of the local waterbodies appear to favor the present situation, where this invasive species reaches extremely high densities, sometimes over 10,000 ind.m-2 as in Armando Ribeiro Gonçalves Reservoir. These observations indicate the im

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Fukushima, T., K. Amano, and K. Muraoka. "Factors Explaining Sediment Concentrations of 16 Elements in 28 Japanese Eutrophic Lakes." Water Science and Technology 23, no. 1-3 (1991): 465–74. http://dx.doi.org/10.2166/wst.1991.0446.

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To understand lake sediment environments, the concentrations of 16 elements in sediments and suspended particulate matter (PM) from 28 Japanese eutrophic lakes were analyzed. Use of some statistical analysis permitted them to be grouped into a) alkali metals and alkaline earth metals (Na, Mg, Ca, Sr, K), b) elements originating from soil particles or rock (Ti, Fe), c) elements having significant anthropogenic inputs (P, Cr, Cu, Zn), d) organic carbon and nitrogen. The ratio of PM to sediments decreased in the order c), d), a) and b). With the aid of a simple conceptual model, some significant

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Viaroli, Pierluigi, Marco Bartoli, Cristina Bondavalli, Robert R. Christian, Gianmarco Giordani, and Mariachiara Naldi. "Macrophyte communities and their impact on benthic fluxes of oxygen, sulphide and nutrients in shallow eutrophic environments." Hydrobiologia 329, no. 1-3 (1996): 105–19. http://dx.doi.org/10.1007/bf00034551.

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Erdoğan, Şeyda, Meryem Beklİoğlu, Elena Litchman, et al. "Determinants of phytoplankton size structure in warm, shallow lakes." Journal of Plankton Research 43, no. 3 (2021): 353–66. http://dx.doi.org/10.1093/plankt/fbab035.

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Abstract Body size is an important trait of any organism, including phytoplankton, because it affects physiological and morphological performance, reproduction, population growth rate and competitive interactions. Understanding how interacting top-down and bottom-up factors influence phytoplankton cell size in different aquatic environments is still a challenge. Structural equation modeling (SEM) is a comprehensive multivariate statistical tool for detecting cause–effect relationship among different variables and their hierarchical structure in complex networks (e.g. trophic interactions in ec

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Nedoma, Jiří, France Van Wambeke, Alena Štrojsová, Martina Štrojsová, and Solange Duhamel. "Affinity of extracellular phosphatases for ELF97 phosphate in aquatic environments." Marine and Freshwater Research 58, no. 5 (2007): 454. http://dx.doi.org/10.1071/mf06211.

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Recently, the phosphatase substrate ELF97 phosphate (ELFP) has been employed to study the presence of extracellular phosphatases in different plankton populations in natural aquatic environments. Kinetic properties of ELFP hydrolysis by natural extracellular phosphatases are, however, mostly unknown. We indirectly studied the affinity of extracellular phosphatases for ELFP in different aquatic environments through its ability to inhibit the hydrolysis of 4-methylumbelliferyl phosphate (4MUP). Values of inhibition constants, Ki, which correspond to the concentrations necessary for half saturati

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Cortelezzi, Agustina, Carolina Ocón, María V. López van Oosterom, Rosana Cepeda, and Alberto Rodrigues Capítulo. "Nutrient enrichment effect on macroinvertebrates in a lowland stream of Argentina." Iheringia. Série Zoologia 105, no. 2 (2015): 228–34. http://dx.doi.org/10.1590/1678-476620151052228234.

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ABSTRACT One of the most important effects derived from the intensive land use is the increase of nutrient concentration in the aquatic systems due to superficial drainage. Besides, the increment of precipitations in South America connected to the global climate change could intensify these anthropic impacts due to the changes in the runoff pattern and a greater discharge of water in the streams and rivers. The pampean streams are singular environments with high natural nutrient concentrations which could be increased even more if the predictions of global climate change for the area are met.

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Lopes, Thais Cristina de Souza, Jeane Cruz Portela, Stefeson Bezerra de Melo, et al. "Characterization of Physical-Chemical and Structural Soil Attributes in the Semiarid Region of the Rio Grande do Norte State, Brazil." Journal of Agricultural Science 11, no. 3 (2019): 359. http://dx.doi.org/10.5539/jas.v11n3p359.

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The study of the soil characterization and the relation of its attributes allows a systematic proposal of the local particularities, leading to adequate practices for maintenance and/or preservation of its productive capacity. In this sense, the aim of this study was to evaluate the influence of structural attributes in association with physical and chemical soil classes, using the multivariate statistical techniques to differentiate environments. The research was carried out in the Moacir Lucena Project, located in the municipality of Apodi, RN, Brazil. Three representative environments were

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Plouviez, Maxence, and Benoit Guieysse. "Nitrous oxide emissions during microalgae-based wastewater treatment: current state of the art and implication for greenhouse gases budgeting." Water Science and Technology 82, no. 6 (2020): 1025–30. http://dx.doi.org/10.2166/wst.2020.304.

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Abstract Microalgae can synthesise the ozone depleting pollutant and greenhouse gas nitrous oxide (N2O). Consequently, significant N2O emissions have been recorded during real wastewater treatment in high rate algal ponds (HRAPs). While data scarcity and variability prevent meaningful assessment, the magnitude reported (0.13–0.57% of the influent nitrogen load) is within the range reported by the Intergovernmental Panel on Climate Change (IPCC) for direct N2O emissions during centralised aerobic wastewater treatment (0.016–4.5% of the influent nitrogen load). Critically, the ability of microal

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37

ASSUNÇÃO, VIVIAN A., JOSÉ C. CASAGRANDE, and ÂNGELA L. B. SARTORI. "Floristics and Reproductive Phenology of Trees and Bushes in Central West Brazil." Anais da Academia Brasileira de Ciências 86, no. 2 (2014): 785–800. http://dx.doi.org/10.1590/0001-3765201420130042.

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Environmental conditions such as temperature, soil, photoperiodic factors and precipitation can determine the physical environment favoring the occurrence of given species and interfere with the reproductive period of plants. This work involved monthly excursions to a slope in the Serra de Maracaju between December 2009 and November 2010. Samples were collected in eight 25 x 50 m plots, transverse to the slope, totaling 1 ha sampled. Floristic richness included 79 species distributed into 58 genera and 31 families. Floristic Similarity Analysis and Principal Component Analysis showed the occur

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Dunck, B., IS Nogueira, and SA Felisberto. "Distribution of periphytic algae in wetlands (Palm swamps, Cerrado), Brazil." Brazilian Journal of Biology 73, no. 2 (2013): 331–46. http://dx.doi.org/10.1590/s1519-69842013000200013.

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The distribution of periphytic algae communities depends on various factors such as type of substrate, level of disturbance, nutrient availability and light. According to the prediction that impacts of anthropogenic activity provide changes in environmental characteristics, making impacted Palm swamps related to environmental changes such as deforestation and higher loads of nutrients via allochthonous, the hypothesis tested was: impacted Palm swamps have higher richness, density, biomass and biovolume of epiphytic algae. We evaluated the distribution and structure of epiphytic algae communiti

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Wójcicki, Krzysztof J. "Stratigraphy of organic-rich deposits in floodplain environments: examples from the upper Odra river basin." quageo 31, no. 3 (2012): 107–17. http://dx.doi.org/10.2478/v10117-012-0024-6.

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Abstract . Macrofossil analysis and radiocarbon dating were used to determine the age, composition and succession pattern of organic-rich deposits infilling oxbows and flood basins in the Rivers Kłodnica, Odra and Osobłoga valleys (southern Poland). Both detrital sediments representing the aquatic or terrestrial environments as well as five types of peat accumulated in amphibious or peatland conditions have been identified in cores analyzed. Studies have shown that an accumulation of organic-rich deposits was commonly initiated by terrestrialisation and was typically occurred under eutrophic c

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Rodrigues, Eduardo Henrique Costa, Aline Martins Vicentin, Leila Dos Santos Machado, Marcelo Luiz Martins Pompêo, and Viviane Moschini Carlos. "Phytoplankton, Trophic State and Ecological Potential in reservoirs in the State of São Paulo, Brazil." Ambiente e Agua - An Interdisciplinary Journal of Applied Science 14, no. 5 (2019): 1. http://dx.doi.org/10.4136/ambi-agua.2428.

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This study evaluated the ecological potential of reservoirs in the Brazilian state of São Paulo, having phytoplankton as a biological quality element. Integrated water column sampling was carried out in the dam, and in the intermediate and fluvial zones of the Igaratá, Atibainha, Paiva Castro, Rio Grande, Itupararanga, Broa, Barra Bonita, Guarapiranga and Salto Grande reservoirs in July 2015. Physico-chemical and biological parameters were analyzed in all environments. The phytoplankton was analyzed under an inverted microscope, and measurements of density, diversity, equitability and dominanc

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41

Zhang, Qi-Ya. "Ubiquity, Diversity, and Genomic Complexity of Cyanophages in Freshwater Environments." Proceedings 50, no. 1 (2020): 105. http://dx.doi.org/10.3390/proceedings2020050105.

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Cyanophages are viruses that infect cyanobacteria (also known as blue-green algae) and are ubiquitious in marine and freshwater environments. In recent years, freshwater cyanophages have attracted more attention because they can affect global freshwater ecosystems. The spatial distribution and morphological diversity of cyanophage populations were examined in Lake Donghu with three trophic regions: hypertrophic, eutrophic, and mesotrophic regions. The surprisingly high viral abundance (ranging from 108 to 109 phage mL−1) and morphological diversity were detected. Most of them have tails and be

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42

Brodie, Jon E., and Alan W. Mitchell. "Nutrients in Australian tropical rivers: changes with agricultural development and implications for receiving environments." Marine and Freshwater Research 56, no. 3 (2005): 279. http://dx.doi.org/10.1071/mf04081.

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In tropical Australia, intensive studies of river suspended sediment (SS) and nutrient dynamics have been restricted to streams on the north-east coast between the Fitzroy and Normanby Rivers (Queensland), Magela Creek/East Alligator River (Northern Territory) and the Ord River (Western Australia). Historical conditions in these rivers were probably characterised by low–moderate SS concentrations and low concentrations of dissolved inorganic nitrogen and phosphorus in flow events. Introduction of agriculture has transformed SS and nutrient dynamics. Grazing has led to soil erosion and increase

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43

Sun, Xiao, Yunlin Zhang, Yibo Zhang, Kun Shi, Yongqiang Zhou, and Na Li. "Machine Learning Algorithms for Chromophoric Dissolved Organic Matter (CDOM) Estimation Based on Landsat 8 Images." Remote Sensing 13, no. 18 (2021): 3560. http://dx.doi.org/10.3390/rs13183560.

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Chromophoric dissolved organic matter (CDOM) is crucial in the biogeochemical cycle and carbon cycle of aquatic environments. However, in inland waters, remotely sensed estimates of CDOM remain challenging due to the low optical signal of CDOM and complex optical conditions. Therefore, developing efficient, practical and robust models to estimate CDOM absorption coefficient in inland waters is essential for successful water environment monitoring and management. We examined and improved different machine learning algorithms using extensive CDOM measurements and Landsat 8 images covering differ

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44

Moore, Eli K. "Trimethylornithine Membrane Lipids: Discovered in Planctomycetes and Identified in Diverse Environments." Metabolites 11, no. 1 (2021): 49. http://dx.doi.org/10.3390/metabo11010049.

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Intact polar membrane lipids (IPLs) are the building blocks of all cell membranes. There is a wide range of phosphorus-free IPL structures, including amino acid containing IPLs, that can be taxonomically specific. Trimethylornithine membrane lipids (TMOs) were discovered in northern wetland Planctomycete species that were isolated and described in the last decade. The trimethylated terminal nitrogen moiety of the ornithine amino acid in the TMO structure gives the lipid a charged polar head group, similar to certain phospholipids. Since their discovery, TMOs have been identified in various oth

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45

Jackson, Togwell A. "Effects of Environmental Factors and Primary Production on the Distribution and Methylation of Mercury in a Chain of Highly Eutrophic Riverine Lakes." Water Quality Research Journal 28, no. 1 (1993): 177–216. http://dx.doi.org/10.2166/wqrj.1993.009.

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Abstract A chain of six highly eutrophic lakes linked by the Qu’Appelle River of southern Saskatchewan is polluted with mercury (Hg) introduced by the river from sources upstream from the lakes. Microbial production of methyl Hg (CH3Hg+) from inorganic Hg in the river and lakes is independent of the total abundance of inorganic Hg but is strongly dependent on environmental conditions that control microbial activity, including the factors which determine the abundance of phytoplankton, the primary source of the organic nutrient substrates utilized by Hg methylating and demethylating microbes. M

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46

Kiersztyn, Bartosz, Waldemar Siuda, and Ryszard Chróst. "Coomassie Blue G250 for Visualization of Active Bacteria from Lake Environment and Culture." Polish Journal of Microbiology 66, no. 3 (2017): 365–73. http://dx.doi.org/10.5604/01.3001.0010.4867.

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Bacteria play a fundamental role in the cycling of nutrients in aquatic environments. A precise distinction between active and inactive bacteria is crucial for the description of this process. We have evaluated the usefulness of Coomassie Blue G250 for fluorescent staining of protein containing potentially highly active bacteria. We found that the G250 solution has excitation and emission properties appropriate for direct epifluorescence microscopy observations. It enables fast and effective fluorescent visualization of living, protein-rich bacteria, both in freshwater environment and culture.

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47

Regnier, P., P. Jourabchi, and C. P. Slomp. "Reactive-Transport modeling as a technique for understanding coupled biogeochemical processes in surface and subsurface environments." Netherlands Journal of Geosciences - Geologie en Mijnbouw 82, no. 1 (2003): 5–18. http://dx.doi.org/10.1017/s0016774600022757.

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AbstractReactive-transport models contribute significantly to the field of modern geosciences. A general mathematical approach to solving models of complex biogeochemical systems is introduced. It is argued that even though mathematical models for reactive-transport simulations can be developed at various levels of approximation, the approach for their construction and application to the various compartments of the hydrosphere is fundamentally the same. The workings of coupled transport-reaction systems are described in more detail by means of examples, which demonstrate the similarities in th

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48

Castro, Hector, Andrew Ogram, and K. R. Reddy. "Phylogenetic Characterization of Methanogenic Assemblages in Eutrophic and Oligotrophic Areas of the Florida Everglades." Applied and Environmental Microbiology 70, no. 11 (2004): 6559–68. http://dx.doi.org/10.1128/aem.70.11.6559-6568.2004.

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ABSTRACT Agricultural activities have produced well-documented changes in the Florida Everglades, including establishment of a gradient in phosphorus concentrations in Water Conservation Area 2A (WCA-2A) of the northern Everglades. An effect of increased phosphorus concentrations is increased methanogenesis in the eutrophic regions compared to the oligotrophic regions of WCA-2A. The goal of this study was to identify relationships between eutrophication and composition and activity of methanogenic assemblages in WCA-2A soils. Distributions of two genes associated with methanogens were characte

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49

Seppänen, Harri. "Biological Treatment of Groundwater in Basins with Floating Filters–II. The Role of Microorganisms in Floating Filters." Water Science and Technology 20, no. 3 (1988): 185–87. http://dx.doi.org/10.2166/wst.1988.0097.

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The role of certain types of bacteria is quite decisive in the formation of iron and manganese precipitates. Bacteria and other organisms participate in the precipitation of soluble iron and manganese in many different ways. The production of hydrogen peroxide seems to be an important phase in the formation of the precipitates. Bacteria produce hydrogen peroxide as an intermediate or an end product of metabolic processes (Gorlenko etal., 1983). Iron and manganese bacteria are typical gradient organisms, growing in a sharp gradient between oxidized and reduced environments. Iron precipitating t

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50

Hilton, John. "A Simple Model for the Interpretation of Magnetic Records in Lacustrine and Ocean Sediments." Quaternary Research 27, no. 2 (1987): 160–66. http://dx.doi.org/10.1016/0033-5894(87)90074-3.

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AbstractMany sources of magnetic minerals have been implicated as potential influences on the magnetic record of lake and ocean sediments. The “state-of-the-art” of our knowledge of these sources and their properties has been used to define a model which indicates those sedimentary environments where specific magnetic mineral sources may influence the magnetic record. Authigenically formed magnetic minerals are only likely to be found in estuaries and eutrophic lakes. Cosmic deposition, eolian deposition, and magnetic bacteria may be important in low-accumulation-rate deep-ocean sediments. Whe

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