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Littérature scientifique sur le sujet « Macrobentho »

Auteur : Grafiati

Publié le 1 avril 2023

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Articles de revues sur le sujet "Macrobentho"

Zhang, Zhongfang, Shanshan Xia, Xuetao Sun et Lizhi Zhou. « Effects of Macrobenthos Relative to Floating-Leaved Plants on the Wintering Shorebird Assemblages at Shengjin Lake, China ». Diversity 14, n^o 12 (5 décembre 2022) : 1072. http://dx.doi.org/10.3390/d14121072.

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In shallow lakes, floating-leaved plants can produce dense lakebeds that dramatically alter freshwater ecosystems and impact macrobenthic communities. Shorebirds are morphologically diverse and utilize different foraging strategies; they can partition food resources to achieve coexistence due to differences in food availability. In this study, we defined shorebird foraging guilds using a principal component analysis and explained differences in shorebird composition in terms of food availability by comparing macrobenthic and shorebird communities in Euryale ferox artificial planting areas, Trapa spp. natural growth areas, and control areas. The Mantel test and a Spearman analysis were used to correlate macrobenthic taxa with shorebird foraging guilds. We recorded four different macrobenthic taxa in the three study areas, including insects, gastropods, oligochaetes, and bivalves. Fifteen species belonging to three shorebird families were recorded across the three study areas. Our results suggest that floating-leaved plants are an important cause of differences in macrobenthic communities, and epifaunal macrobenthos (insects and gastropods) and infaunal macrobenthos (oligochaetes and bivalves) take on different patterns of diversity composition in different habitats. The macrobenthic and shorebird communities were potentially coherent. Different shorebird foraging guilds were limited by food availability and thus correlated differently with different macrobenthos. Therefore, differences in macrobenthic communities relative to floating-leaved plants can affect shorebird assemblages by affecting the availability of food resources.

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Selleslagh, Jonathan, Sandric Lesourd et Rachid Amara. « Comparison of macrobenthic assemblages of three fish estuarine nurseries and their importance as foraging grounds ». Journal of the Marine Biological Association of the United Kingdom 92, n^o 1 (7 avril 2011) : 85–97. http://dx.doi.org/10.1017/s0025315411000336.

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Macrobenthic assemblages were examined in three fish estuarine nurseries and related to environmental variables, as well as fish and macrocrustaceans, in order to assess and compare the potential foraging ground value of these systems. Macrobenthos was sampled in spring 2007 in the Canche, Authie and Somme estuaries (eastern English Channel, France). A total of 17, 28 and 23 macrobenthic taxa, with a clear dominance of amphipods (mainly Bathyporeia sarsi), polychaetes and bivalves, were recorded in the three estuaries respectively. Although predators (fish and macrocrustaceans) were abundant, relatively high densities of macrobenthos were observed: 876.2 ± 389.1, 595.4 ± 197.2 and 854.3 ± 281.2 ind. m-2 in the Canche, Authie and Somme, respectively. No significant difference in species richness, Shannon–Wiener diversity and density (total and dominant groups) of macrobenthos was observed between the three estuaries. Although the analysis of similarity and similarity percentages analyses indicated that macrobenthic assemblage was variable between Authie and Somme, results showed that macrobenthos resource was relatively high and similar in the three estuaries. Taking into account these considerations, the present study indicated a similar relative importance of the Canche, Authie and Somme estuaries as foraging grounds for fish and macrocrustaceans during spring. Multivariate analysis showed that macrobenthic assemblages were mainly driven by salinity and sediment characteristics in the Canche and Authie estuaries while in the Somme estuary sediment characteristics were the most influencing parameters.

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Haque, Md Mozammal, Abu Sayed Muhammad Sharif, Md Kawser Ahmed, Ferdows Anwar, Seema Rani, Md Habibur Rahman Molla et Makidul Islam Khan. « Distribution and Diversity of Macrobenthos in Sangu River, Bangladesh ». Dhaka University Journal of Earth and Environmental Sciences 9, n^o 2 (10 août 2021) : 27–34. http://dx.doi.org/10.3329/dujees.v9i2.55087.

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This study was conducted to understand the macrobenthos distribution and abundance in Sangu River to monitor the aquatic pollution level. Both surface and sub-surface water and benthic sediments were collected from three stations of the Sangu River. A few indices viz. Shannon-wiener, Simpson, Margalef’s and Evenness were used to estimate the macrobenthic assemblages. In this study, a total of 11 major taxa comprising total 870 macobenthic species were identified. Shannon-wiener index was maximum (1.58) at lower part (LP) which indicated moderate to heavily pollute aquatic environment of the Sangu River. The average diversity values of Shannon, Evenness, Simpson and Margalef’s indices were 0.97, 0.43, 0.39 and 1.54 respectively. The concentration of dissolved oxygen was the lowest (4.90 mg/L) at LP and the highest (5.08 mg/L) at upper part (UP). This study showed that macrobenthos abundances was influenced by higher temperature, salinity, and pH. The percentage of organic carbon content was maximum (98.18%) at LP where the macrobenthic abundance was 330 individuals/m2, whereas it was minimum (80.77%) at UP where macrobenthic abundance was 248 individuals/m2 that indicated carbon content also influence the assemblages of the macrobenthos in the Sangu River. A clear gradient of physico-chemical and benthic soil parameters fluctuation was also found to be responsible for the variations of macrobenthos assemblage in the Sangu River. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 9(2), 2020, P 27-34

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Pan, Sin-He, Chuan-Wen Ho, Chiao-Wen Lin, Shou-Chung Huang et Hsing-Juh Lin. « Differential Response of Macrobenthic Abundance and Community Composition to Mangrove Vegetation ». Forests 12, n^o 10 (14 octobre 2021) : 1403. http://dx.doi.org/10.3390/f12101403.

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The mass planting of mangroves has been proposed as a mitigation strategy to compensate for mangrove loss. However, the effects of mangrove vegetation on the abundance and community composition of macrobenthos remain controversial. The macrobenthic communities in four intact mangrove forests with different conditions and the adjacent nonvegetated mudflats of two mangrove species with distinct stand structures on the western coast of Taiwan were examined. Some macrobenthic taxa occurred only in the mangroves, suggesting macrobenthic critical habitats. Seasonal shift in community composition was more pronounced in the mudflats than in the mangroves, possibly due to the rich food supply, low temperature, and shelter function provided by mangrove forests. However, crab density was always lower in the mangroves than in the mudflats. There was a negative relationship between the stem density of Kandelia obovata (S., L.) and infaunal density. The pneumatophore density of Avicennia marina (Forsk.) correlated negatively with epifaunal density. Our results show that the response of macrobenthic abundance and community composition to mangrove vegetation was inconsistent. We reason that mangroves are critical habitats for the macrobenthos in the mudflats. However, if mangrove tree density is high, we predict that the macrobenthic density will decrease. This suggests that at some intermediate level of mangrove tree density, where there are enough mangrove trees to harbor a macrobenthic community but not enough trees to significantly reduce this density, mangroves management can be optimally achieved to promote the presence of a diverse and dense macrobenthic community.

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Shafie, B. B., A. Man, N. F. Ali et A. A. Rahim. « Macrobenthos diversity along the Exclusive Economic Zone of East Coast Peninsular Malaysia ». Journal of Environmental Biology 42, n^o 3(SI) (31 mai 2021) : 817–23. http://dx.doi.org/10.22438/jeb/42/3(si)/jeb-13.

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Aim: To examine the standing stock of macrobenthos along a depth gradient at regional scales in the Sunda Shelf of Malaysian Economic Exclusive Zone (EEZ). Methodology: Macrobenthos was sampled with a Smith–McIntyre grab at 19 stations on the continental shelf of the South-western South China Sea (east coast of Peninsular Malaysia) within the EEZ and was carried out onboard MV SEAFDEC II in May/June 2016. Results: The faunal composition, abundance, and diversity of species, together with environmental parameters were studied. A total of 10,232 individuals comprising 105 families were identified. The dominant macrobenthic group was Mollusca (55.25%), followed by Annelida (26.80%) and Arthropoda (15.36%), while the Echinodermata and Miscellaneous group recorded 1.13% and 1.43% respectively. Based on Bray-Curtis species similarities, five different sample groups (SGs) were distinguished, which were located in different zones and gradients of EEZ. Interpretation: Variations in the macrobenthic community is significantly associated with depth, temperature, and salinity. Further research should be conducted on other factors that contribute to the diversity of macrobenthos along the east coast of Peninsular Malaysia’s EEZ.

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Farabi, Seyyed Mohammad Vahid, Abolghasem Roohi et Abdolhamid Azari. « Comparative study of the impacts of fish cage culture on some environmental factors and Macrobenthic communities in offshore farms in the southern Caspian Sea ». Journal of Aquaculture & ; Marine Biology 12, n^o 1 (2023) : 1–6. http://dx.doi.org/10.15406/jamb.2023.12.00350.

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The aim of this study was to investigate the effects of fish cage culture on Macrobenthic in the southern Caspian Sea. Samples were collected in two offshore farms with four floating polyethylene cages with a production of 60 tons for 5 months in 2015. Sampling was performed of macrobenthos, physicochemical, and sediment in January, March, May, and August at the depths of shade, 50, 100, and 1000 m in three geographical directions (east, west, and south) of the farm. Macrobenthic analysis showed Hypaniola kowalewskii and Streblospio gynobranchiata were predominant, which resulted in an unusual condition due to the effectiveness of the marine farm. There was a linear relationship between environmental factors and macrobenthos communities under the RDA analysis test and the water temperature was the most crucial factor in the density of the dominant species in both fish farm sites. The dominant Macrobenthic species were subjected to environmental conditions in addition to the influence of temperature, salinity, pH, dissolved oxygen, nitrogen, and phosphorus compounds. This situation can be attributed to the hydrological conditions of the studied area; low production of fish, a short period of fish farming, suitable depth of cages established and different water flow directions.

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Xiong, Shao Gao, Hong Yuan Li et Xiu Ming Wang. « Relationships between Macrobenthos and Environmental Variables in Tianjin Offshore Water ». Advanced Materials Research 838-841 (novembre 2013) : 2556–60. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2556.

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With rapid economic and social development in Tianjin coastal area, environmental impact factors are increasingly complex. In order to study the relationships between macrobenthos and environmental variables, macrobenthos and seven environmental variables (including dissolved oxygen, active phosphate, inorganic nitrogen, ammonia, nitrate, nitrite, and oil) are investigated in the summer of 2004 and 2007. Canonical Correspondence Analysis (CCA) and Redundancy Analysis (RDA) in CANOCO software are all employed in the analysis for mutual authentication of the result. The results indicate that: (1) reactive phosphate and nitrite are the most important impact factor for the macrobenthic community; (2) nitrate is the supplementary factor that explains the macrobenthos data; (3) whether inorganic nitrogen is a key impact factor, it needs further research.

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Kim, Sang Lyeol, Su Min Kang, Hyung-Gon Lee, Gwan Hee Han et Ok Hwan Yu. « Species Diversity and Community Structure of Macrobenthos in the Ulleung Basin, East Sea, Republic of Korea ». Journal of Marine Science and Engineering 11, n^o 1 (3 janvier 2023) : 92. http://dx.doi.org/10.3390/jmse11010092.

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The Ulleung Basin of the East Sea is a biological hotspot, but studies on the macrobenthos therein are lacking. To evaluate the macrobenthos species diversity and community structure in the Ulleung Basin, we conducted a survey from 2017 to 2021. A total of 262 species of macrobenthos was detected by the survey, and the average habitat density was 243 individuals/m2. The average biomass of macrobenthos was 43.7 g/m2, and the average Shannon and Wiener’s diversity index was 2.3 (0.69–3.61). The dominant species were the polychaetes Terebellides horikoshii, Chaetozone setosa, Scalibregma inflatum, and Aglaophamus sp. and the bivalvia Axinopsida subquadrata. The community structure of macrobenthos differed according to water depth, and a correlation analysis using environmental variables showed that the community was affected by water temperature, salinity, and dissolved oxygen. The macrobenthic fauna in the Ulleung Basin was greatly influenced by water depth, the sedimentary environment was different, and the dominant species were also different. In addition, there was little seasonal change compared to the East Sea coast. Our findings will facilitate further investigation of benthic ecosystems throughout the East Sea.

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Vineetha S. « The Benthic Macrofaunal Community in Agricultural Ditches in Kole Paddy Fields, Vembanad Kole Wetlands, India ». Journal of Advance Research in Business Management and Accounting (ISSN : 2456-3544) 2, n^o 11 (30 novembre 2016) : 01–08. http://dx.doi.org/10.53555/nnbma.v2i11.492.

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Paddy fields are connected by drainage ditches (channels),that are considered as drivers of biodiversity inagricultural areas. The macrobenthic community structure in agricultural ditches of Kole paddy fields, a part ofthe Ramsar site Vembanad kole wetlands during a complete crop season was analyzed. The macrobenthicfauna belonged to phyla Annelida, Arthropoda and Mollusca and classes Oligochaeta (60.39%), Insecta(39.31%), Mollusca (0.15%) and Hirudinae (0.15%). The class Oligochaeta was represented by Tubificidae,Naididae, Lumbriculidae; Insecta by Diptera, Coleoptera, Odonata; Mollusca by Bivalvia, Gastropoda.Composition of macrobenthos resembled to that of fresh water wetlands and paddy fields. The average numberof macrobenthos was 1475±2064 ind./m2. There was an unusually high abundance in May (5155 ind./m2); butthe environmental parameters remained usual. The abundance of good quality food or some specific, localizedcondition acting on a microscale which could not be recorded in the environmental analysis would haveresulted in the unusual distribution of the fauna. Highest diversity (3.17) and species richness (1.95) wasobserved during May 2011, during the unusual abundance. Predominant functional feeding group wascollector gatherers indicating the abundance of fine organic particulate matter (FPOM) in the substrate. Nosignificant correlation emerged between macrobenthic abundance and environmental parameters.

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Kim, Sang Lyeol, Hyung Gon Lee, Su Min Kang et Ok Hwan Yu. « The Influence of Manila Clam (Ruditapes philippinarum) on Macrobenthos Communities in a Korean Tidal Ecosystem ». Sustainability 12, n^o 10 (20 mai 2020) : 4205. http://dx.doi.org/10.3390/su12104205.

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We investigated the biological impact of extensive Manila clam (Ruditapes philippinarum) aquaculture on macrobenthic communities in a tidal ecosystem in Korea. We collected macrobenthos (>1 mm in length) samples seasonally in the intertidal zone in Geunsoman, Taean, Korea from April 2011 to December 2014. We identified 146 macrobenthos species, including 60 polychaetes, 53 crustaceans, and 16 mollusks. A biota–environment matching (BIO–ENV) analysis indicated that the benthic community was affected by mean sediment grain size (Mz), total organic carbon (TOC), and R. philippinarum biomass. We found no correlation between R. philippinarum and the main dominant species (Heteromastus filiformis, Ceratonereis erythraeensis, and Ampharete arctica), which have a different feeding strategy; thus, this may result in a lack of competition for food resources. In addition, we found that flourishing R. philippinarum positively affects the macrobenthos density but negatively affects the biodiversity index. Moreover, competition between species does not occur clearly, and environmental variables (sediment, organic carbon) are important.

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Thèses sur le sujet "Macrobentho"

Carvalho, Gabriel Niero de. « Proposta de tratamento e modelagem de dados espaciais para uso em infraestrutura de dados espaciais - IDEs : estudo de caso de macrobentos para a área costeira da Baixada Santista ». Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-11072014-122413/.

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As zonas costeiras são áreas complexas que contemplam ambientes terrestres e marinhos que, além de possuírem enorme riqueza ambiental, também são áreas atrativas aos seres humanos por oferecer alimentos, lazer, negócios, transporte, entre outros. Algumas dificuldades de gerenciamento ocorrem pela complexidade, conflito de interesses e pelo fato de não haver padronização no levantamento de dados e disponibilização para a comunidade científica, órgãos públicos, etc. O uso de geotecnologias pode auxiliar na organização, padronização e compartilhamento destas informações em Atlas Web além de apoiar no planejamento e tomada de decisão pois agregam, em um único ambiente, diversos dados provenientes de fontes distintas. A construção de um modelo de dados espacial voltado à área ambiental, para ser utilizada em Infraestrutura de Dados Espaciais (IDE) é exemplificada a partir da modelagem de um bioindicador, Macrobentos, de qualidade de sedimentos. Este trabalho apresenta as etapas necessárias para a construção de modelo de dados espacial de Macrobentos e emprega a Região Metropolitana da Baixada Santista como referência, além de ilustrar e discutir as principais dificuldades para organizar os dados não padronizados. Conclui-se que a estruturação do conhecimento quando se trabalha com dados ambientais em um modelo é essencial para sua posterior integração em IDE. Constatou-se no processo de modelagem que questões metodológicas relativas ao processo de coleta podem dificultar ou até mesmo inviabilizar a integração de dados provenientes de diferentes estudos. A construção de um modelo de dados espacial e sua posterior publicação via Geoportal, como o apresentado neste estudo, poderá ser utilizado como referência para novas pesquisas com objetivos semelhantes.
Coastal zones are complex areas that include marine and terrestrial environments. Besides its huge environmental importance, they also attract humans because they provide food, recreation, business, transportation, among others. Some difficulties to manage these areas are related with their complexity, diversity of interests and the absence of standardization to collect and share data to scientific community, public agencies, among others. The use of geo-technologies can be used in the organization, standardization and sharing of this information through Atlas Web and assists planning and decision making issues because it aggregates different files from distinct sources. The construction of a spatial database integrating the environmental business, to be used on Spatial Data Infrastructure (SDI) is illustrated by a bioindicator, Macrobenthos, that indicates the quality of the sediments. This research shows the required steps to build Macrobenthos spatial database based on Santos Metropolitan Region as a reference. Besides, it tries to illustrate the problems related to organize non standardized data. It can be concluded, when working with environmental data, that the structuring of knowledge in a conceptual model is essential for their subsequent integration into the SDI. During the modeling process it can be noticed that methodological issues related to the collection process may obstruct or make impracticable the data integration from different studies of the same area. The development of a database model and its subsequent publication in a Geoportal can be used as a reference for further research with similar goals.

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Fernandes, Sandra Cristina dos Reis Borges. « Functional role of macrobenthos in estuarine sediment dynamics ». Doctoral thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/2019.

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Thesis submitted to the Universidade Nova de Lisboa,Faculdade de Ciências e Tecnologia for the degree of Doctor of Philosophy in Environmental Engineering
Estuaries are areas of high sediment dynamics. Particles in suspension are an important vehicle of several biochemical substances and contaminants. Therefore, the knowledge on the processes ruling sediment dynamics is needed to develop tools for estuarine water quality management. Presently, few numerical models for sediment dynamics incorporate biological interactions with sediment dynamics. The aim of this study is to gain understanding of the macrobenthic influences on cohesive sediment dynamics. The research was focused on the effects of two species of macrobenthos; 1) the cockle Cerastoderma edule (densities of 280 to 1000 ind m-2). Work on this species focused on sediment transport and deposition, by studying the hydrodynamic effect on the sediment removal activity (filtration) and its effects on topography and on the current velocities at the boundary layer 2) The ragworm Nereis diversicolor (densities of 320 to 1200 ind m-2). This work focused on sediment erodability and consolidation by studying the bioturbation effect on changes in the sediment properties,and 3) the effect of contamination (3 nmol Cu g-1 dw) on the bioturbation activity of N. diversicolor and on sediment dynamics. The results from experiments performed in a racetrack and in an annular flume showed that increasing density of C. edule is proportional to increasing sediment topography and related to reduced current velocities near the bed and increased shear velocity (u*), hydrodynamic roughness length and turbulence kinetic energy (TKE). The higher TKE values were related to the presence of active filtering C. edule, producing additional turbulence to the TKE produced by topography. The effect of filtration activity on turbulence is most pronounced at low velocities (u* < 1.5 cm s-1), in agreement with a unimodal response to increased velocities. Increasing densities of N. diversicolor are related to increased sediment shear strength (SS), increased biodiffusion coefficients (Db) and increased erosion rates (ER). This antagonistic effect of increase SS and ER is explained by erosion of bigger aggregates resulting from biological bound sediments. This study provides some evidence that copper contaminated sediments are more stable, as a consequence of decrease in biological response to toxicity, observed in lower values of shear strength and erosion rates. In addition, new methodologies for the determination of some of the parametersinvolved with this research field are suggested.
This thesis was financed by Fundação para a Ciência e Tecnologia SFRH/BD/6188/2001

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Kaltenberg, Eliza Maria. « New Approaches in Measuring Sediment-Water-Macrobenthos Interactions ». Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1458661697.

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Quinnell, Susan Elizabeth. « Estuarine Canaries : Macrobenthos Measures Pollution when Chemical Tests Cannot ». Thesis, Griffith University, 2012. http://hdl.handle.net/10072/366573.

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Bramble Bay, an estuary with a long history of contamination, appears to have crossed multiple tipping points into a state of unstable biomass dominated by opportunistic species. In early 1996 mass mortality events began to affect the bay’s macrobenthic community within a few days of modest rainfall (30 mm) over the catchments. The numbers of wading birds and fish using the beach at such times greatly declined. Between mortality events the macrobenthos staged partial recoveries. However, 10 years later the beach had not attained the diversity of species it supported prior to 1996. Also, the riverine estuaries that drain the catchments had been severely affected. Monitoring in 1998 – 2000 showed that the abundance of riverine macrobenthos in six drainage systems was < 15% of that in 1972 – 1973 when these drainage systems were extensively surveyed and < 2.5% of that after extreme flooding in 1974. Remarkably, the variance of total abundance within estuaries had been reduced by 90 - 99%. Nearly all of the once-dominant peracarids had gone. Chemical tests could not explain this. Nor are other simplistic explanations credible, such as floods or changes in the rate of sedimentation, because only some components of the macrobenthos have been adversely affected. Most deposit feeders have been severely reduced, however, deposit-feeding annelids as well as suspension feeding molluscs and crustaceans have continued to thrive amongst the sediments.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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COSTA, Clarissa Moreira Coelho. « Distribuição Espacial e Temporal do Macrozoobentos de Habitats Entremarés do Canal da Raposa, Baía de São Marcos, Maranhão, Brasil ». Universidade Federal do Maranhão, 2017. http://tedebc.ufma.br:8080/jspui/handle/tede/1868.

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Macrozoobenthos of different grain size intertidal habitats were sampled during wet and dry seasons on Raposa Channel, Maranhão State, Brazil. The sampling was made with a PVC corer. The benthic organisms was sieved using 1 and 0,5 mm sieves and identified under a stereoscopic microscope. There were a few dominant species despite of many rare ones. Paraonis agilis, Notomastus aberans, Capitella capitata and Odontosyllis heterofalchaeta had high densities on Raposa Channel habitats. The macrozoobenthos had higher densities during wet season, specially the deposit and suspension feeders. The deposit feeders were dominant at higher silt/clay content habitats, while the suspension feeders dominated higher sand content ones. These habitats were the most diverse. Ceratia rustica, Vitrinella filifera, Paraonis agilis, Scaphopoda indet. and Caecum sp had high contribution on dissimilarity between habitats, most expressive during dry season. Sediment humidity, organic mater content, sand, silt and clay percentages and grain selection showed that habitats were significantly differents.
Macrozoobentos de habitats entremarés de diferentes classificações granulométricas foram amostrados nos períodos chuvoso e de estiagem no Canal da Raposa, Ilha de São Luís, Maranhão, Brasil. A amostragem utilizou um cilindro de PVC e os organismos bentônicos foram submetidos à triagem em peneiras geológicas (1 e 0,5 mm de malha) e sob microscópio estereoscópico. Foram representados por poucas espécies amplamente dominantes a despeito de numerosas espécies raras. Paraonis agilis, Notomastus aberans, Capitella capitata e Odontosyllis heterofalchaeta foram as espécies de Polychaeta mais abundantes nos habitats estudados no Canal da Raposa. O macrozoobentos atingiu maiores densidades no período chuvoso, especialmente detritívoros e filtradores. Os detritívoros foram dominantes nos habitats com maiores porcentagens de silte e argila, enquanto filtradores foram dominantes nos habitats com maiores porcentagens de areia, nos quais houve maior diversidade. Ceratia rustica, Vitrinella filifera, Paraonis agilis, Scaphopoda indet. e Caecum sp foram as espécies que mais contribuíram para a dissimilaridade entre os habitats estudados, que foi maior no período de estiagem. Umidade, teor de matéria orgânica, porcentagens de areia, silte e argila e desvio padrão dos grãos mostraram diferenças significativas entre os habitats estudados no Canal da Raposa.

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Narayanaswamy, Bhavani Emma. « Macrobenthic ecology of the West Shetland Slope ». Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/42146/.

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An unusual and complex hydrographic regime in the Faeroe-Shetland Channel makes it one of the best-studied oceanographic provinces in the world. However, few benthic ecological studies of the region have been undertaken since the early 1880s. The present study examines the influence of a number of environmental variables on macrobenthic faunal distribution on the West Shetland Slope. Macrobenthic samples were collected by corer and grab along a depth transect in 1996 and 1998. The macrofauna studied were retained on 500 m and 250 m sieves enabling comparisons to be made between samples taken using these two sieve sizes. The addition of the 250 m-to-500 m size fraction to the >500 m size fraction resulted in an increase in species diversity (31% at the 150 m station) and species richness (38% at the 800 m station). Faunal abundance was also seen to increase by an average of 40% per station when combining the smaller size fraction. The results also illustrated that water temperature appears to be the major environmental variable controlling benthic macrofaunal distribution (especially in terms of standing stock), polychaete species diversity, feeding modes and restriction of polychaete species to specific temperature bands. Other environmental variables such as sediment grain size and total organic carbon also influenced macrofaunal distribution although to a lesser degree. The level of taxonomic resolution required was investigated and the conclusion drawn was that to achieve adequate discrimination between stations for this area, the macrofauna should be identified to species level.

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Thrush, S. F. « Community ecology of the sublittoral macrobenthos of Lough Hyne (INE) ». Thesis, University of East Anglia, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355351.

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Craft, Jessica A. « Reef Macrobenthos Adjacent to a Major Navigational Inlet : Port Everglades, Florida ». NSUWorks, 2006. http://nsuworks.nova.edu/occ_stuetd/376.

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The reefs off Broward County, Florida, are non-accreting, lie near the northernmost limits of tropical coral reefs, and are now being affected by human influences including physical damage and pollution. Port Everglades may be a source of many anthropogenic contaminants, discharging freshwater, sediments, hydrocarbons, pesticides, heavy metals, and nutrients in a plume that sweeps over the coastal reef. These reefs should be considered fragile, and therefore warrant careful investigation, monitoring and management. This study surveyed the reef community immediately to the north and south of the Port Everglades inlet to determine if the inlet effluent plume produces a water quality gradient and associated biological gradient. Species composition and percent cover of corals, sponges and macroalgae were surveyed adjacent to the inlet using quadrat sampling, point-plotless and line-intercept transects. In addition, water quality parameters were measured from samples taken from the inlet plume including nitrites and nitrates, Total Kjeldahl nitrogen (TKJN), chlorophyll and specific conductivity, in order to delineate the plume and compare with benthic coverage. Live scleractinian coral cover was less than five percent at most sites and appeared to follow substrate variability rather than influence by water quality, and showed no significant correlation with distance from the inlet. However, coral mortality appeared to increase near the inlet, though not significantly. Fleshy macroalgae also showed notable increases at sites nearest the inlet, though no significant linear trend could be shown. Sponges showed no significant change in abundance with proximity to the inlet; however, sponge morphology appears variable in the nearshore environment, and measuring the size and shape of sponges rather than point-plotless estimates may give a more accurate picture of sponge cover. Chlorophyll levels over the reef were positively correlated with levels of nitrites and nitrates coming from the inlet, and coral cover was negatively correlated with chlorophyll concentrations, indicating an indirect correlation between coral cover and nitrites and nitrates. Coral cover was also negatively correlated with phosphorus at sites south of the inlet, and positively correlated with specific conductivity at all sites. Though macroalgae cover was not significantly correlated with any factor, fleshy macroalgae height was positively linked with levels of TKJN, but negatively linked with levels of phosphorus coming from the inlet. Sponge abundance was negatively correlated with nitrites and nitrates, and TKJN, and positively correlated with conductivity at sites south of the inlet. Of the transect methods used, point-plotless transects were fastest and most convenient. However, corals are sparse in the nearshore environment and the distance between each coral colony can increase the likelihood that point-plotless transects will miss coral colonies along a transect line. Sparse benthic cover also produced results with high variation using the quadrat analysis. Line-intercept transects record all cover of a benthic group being assessed along a transect, and thus seem more appropriate in an area of highly variable substrate and resulting biotic cover. This study concluded that Port Everglades affects the health and composition of the adjacent reef. Some biological categories appear to reflect water quality, though further assessment on a larger portion of the reef is recommended.

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Neubauer, R. Joseph. « The Relationship between Dominant Macrobenthos and Cyclical Hypoxia in the Lower York River ». W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539617659.

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Retraubun, Alex S. W. « Food gathering and associated behaviour of three macrobenthic deposit feeders ». Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262464.

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Livres sur le sujet "Macrobentho"

Sokolova, M. N. Feeding and trophic structure of the deep-sea macrobenthos. Washington, D.C : Smithsonian Institution Press, 2000.

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Feeding and trophic structure of the deep-sea macrobenthos. Enfield, N.H : Science, 2000.

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Burd, Brenda Jean. Macrobenthic infauna from Hecate Strait, British Columbia. Sidney, B.C : Institute of Ocean Sciences, Dept. of Fisheries and Oceans, 1987.

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O, Brinkhurst Ralph, Institute of Ocean Sciences, Patricia Bay. et Canada. Dept. of Fisheries and Oceans., dir. Macrobenthic infauna from Hecate Strait, British Columbia. Sidney, B.C : Fisheries and Oceans, Canada, 1987.

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Thrush, S. F. Community ecology of the sublittoral macrobenthos of Lough Hyne (Ine). Norwich : University of East Anglia, 1985.

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Grange, K. R. Monitoring of littoral macrobenthos and surface sediments in Manukau Harbour, New Zealand. Wellington, N.Z : New Zealand Oceanographic Institute, Division of Water Sciences, 1989.

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Canada. Dept. of Fisheries and Oceans. Effects of Wood Waste For Ocean Disposal on the Recruitment of Marine Macrobenthic Communities. S.l : s.n, 1985.

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Brock, Richard E. Community structure of fish and macrobenthos at selected sites in the vicinity of the Mokapu Ocean Outfall, O'ahu, Hawai'i, 1998. Honolulu, Hawaii (2540 Dole St., Honolulu 96822) : Water Resources Research Center, University of Hawai'i at Mānoa, 1999.

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Brock, Richard E. An analysis of the fish and macrobenthos along the Sand Island deep ocean outfall using remote video : IX. 1998 data. Honolulu (2540 Dole Street, Honolulu 96822) : Water Resources Research Center, University of Hawaii at Mānoa, 1998.

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Brock, Richard E. Community structure of fish and macrobenthos at selected shallow-water sites in relation to the Barbers Point Ocean Outfall, 2005. Honolulu, Hawaii : Water Resources Research Center, University of Hawai'i at Mānoa, 2005.

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Chapitres de livres sur le sujet "Macrobentho"

Por, F. D. « Macrobenthos ». Dans The Pantanal of Mato Grosso (Brazil), 64–65. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0031-1_22.

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Newell, Roger I. E., et Jörg A. Ott. « Macrobenthic communities and eutrophication ». Dans Ecosystems at the Land‐Sea Margin : Drainage Basin to Coastal Sea, 265–93. Washington, D. C. : American Geophysical Union, 1999. http://dx.doi.org/10.1029/ce055p0265.

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Khalil, Magdy T. « Macrobenthos Diversity of Egypt’s Coastal Wetlands ». Dans The Handbook of Environmental Chemistry, 173–93. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/698_2018_240.

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Majdi, Nabil, et Walter Traunspurger. « Production of freshwater nematodes. » Dans Ecology of freshwater nematodes, 247–69. Wallingford : CABI, 2021. http://dx.doi.org/10.1079/9781789243635.0008.

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Abstract This chapter focuses on the methods used to determine freshwater nematode production. It begins by briefly describing the methods used in sampling and measuring nematodes, followed by a summary of the common allometric models developed to estimate secondary production. It then presents a case study in which the results of those models are compared. Finally, it evaluates the drivers of nematode production in different lakes and streams and compares nematode secondary production with that achieved by macrobenthos, other meiobenthic taxa and microbes.

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Carcedo, M. Cecilia, Sabrina Angeletti, Georgina Zapperi, Eder P. Dos Santos et Sandra M. Fiori. « The Intertidal Soft-Bottom Macrobenthic Invertebrates ». Dans The Bahía Blanca Estuary, 179–213. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66486-2_8.

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Diaz, Robert J. « Response of tidal freshwater macrobenthos to sediment disturbance ». Dans Aquatic Oligochaete Biology V, 201–12. Dordrecht : Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0842-3_23.

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Migné, A., et D. Davoult. « Multi-scale heterogeneity in a macrobenthic epifauna community ». Dans Space Partition within Aquatic Ecosystems, 375–81. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0293-3_35.

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Vincent, Bruno. « The macrobenthic fauna of the St. Lawrence Estuary ». Dans Coastal and Estuarine Studies, 344–57. Washington, D. C. : American Geophysical Union, 1990. http://dx.doi.org/10.1029/ce039p0344.

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Vincent, Bruno. « The Macrobenthic Fauna of the St. Lawrence Estuary ». Dans Oceanography of a Large-Scale Estuarine System, 344–57. New York, NY : Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4615-7534-4_15.

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Petryashov, V. V., B. I. Sirenko, A. A. Golikov, A. V. Novozhilov, E. Rachor, D. Piepenburg et M. K. Schmid. « Macrobenthos Distribution in the Laptev Sea in Relation to Hydrology ». Dans Land-Ocean Systems in the Siberian Arctic, 169–80. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60134-7_17.

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Actes de conférences sur le sujet "Macrobentho"

Munjiu, Oxana. « Starea macrobentosului rîului Prut în anul 2020 ». Dans Simpozion "Modificări funcționale ale ecosistemelor acvatice în contextul impactului antropic și al schimbărilor climatice". Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/9789975151979.10.

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In this study the author presents data on the density, biomass and diversity of macrobenthos along the Prut River in 2020. There are data on groups more sensitive to environmental changes and anthropogenic impact, collection points of interest in terms of species conservation due to the presence of rare species, the potential impact of invasive species.

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Shi, Guan Wan, Lee Di Min, Mazlan Abd Ghaffar, Masni Md Ali et Zaidi Che Cob. « Macrobenthos composition, distribution and abundance within Sungai Pulai estuary, Johor, Malaysia ». Dans THE 2014 UKM FST POSTGRADUATE COLLOQUIUM : Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895269.

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Munjiu, Oxana, et Nadejda Andreev. « Zoobenthos of the Dniester river on the territory of the Republic of Moldova for the period 2018-2021 ». Dans Xth International Conference of Zoologists. Institute of Zoology, Republic of Moldova, 2021. http://dx.doi.org/10.53937/icz10.2021.09.

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The data on the influence of dams on the structural and functional parameters of the macrobenthos of the Dniester River on the territory of the Republic of Moldova are presented. A decrease in the biodiversity and number of groups most sensitive to negative environmental changes (mayflies, stoneflies and caddis flies) was noted. The results described in this article, indicate that the total number of zoobenthos species and the number of most sensitive species to negative environmental changes can serve as suitable indicators of the impact of hydropower facilities on the Dniester River

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Li, Xiang, Xuyang Wang, Biao Wang, Xiaochen Li, Tong Ge et Yan Wen. « Performance study and flow analysis of an annular multi-nozzle macrobenthos sampler ». Dans PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2014 (ICNAAM-2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4912874.

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Ajan, James Kulleh, Sajali Hj. Kip et Seng Tak Leong. « Macrobenthic Community as Environmental Pollution Indicator in Shell Malaysia EP ». Dans SPE Asia Pacific Health, Safety and Environment Conference and Exhibition. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/96563-ms.

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Sutthacheep, Makamas, Makamas Sutthacheep, Thamasak Yeemin, Thamasak Yeemin, Sittiporn Pengsakun, Sittiporn Pengsakun, Kanwara Sangmanee, Kanwara Sangmanee, Juthamart Putthayakool et Juthamart Putthayakool. « MONITORING CORAL RECOVERY AT NEARSHORE CORAL REEFS IN PHANGNGA PROVINCE, THE ANDAMAN SEA FOLLOWING THE 2010 CORAL BLEACHING EVENT ». Dans Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b936dde9b43.46989412.

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Mass bleaching and subsequent mortality of scleractinian corals in response to elevated seawater temperatures has been considered as one of the most impacts of global climate change. Three extensive coral bleaching events in the Andaman Sea were reported, in the years 1991, 1995 and 2010. Studies on survival of coral colonies, coral recruitment and community structure of coral reef associated macrofauna would predict the trends for coral recovery from the impacts of coral bleaching events. The present study aimed to examine the status of coral communities, density of coral recruits and coral reef associated macrofauna at nearshore coral reefs in Phangnga Province, the Andaman Sea following the 2010 coral bleaching event. The dead coral cover was high (>50%) while the live coral cover was in the range of 13-21%. There was high diversity of coral recruits on natural substrates. The average densities of macrobenthic fauna varied from 1.9 to 2.6 individuals.m-2, with significant differences among study sites. The dominant macrobenthic species were a soft coral (Lobophytum sp.), a sea star (Linckia laevigata) and a sea urchin (Echinostrephus molaris). Coral recovery at these coral reefs would be possible but local anthropogenic stressors must be overwhelmingly reduced in order to enhance coral reef resilience. The long-term monitoring programs in the Andaman Sea are required for decision makers to support their adaptive management approaches.

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Naqsyabandi, S., E. Riani et S. Suprihatin. « Impact of batik wastewater pollution on macrobenthic community in Pekalongan River ». Dans PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064125.

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Guerra, C., F. Cobo, M. González et J. Alonso. « Stability and resilience in macrobenthic communities : the role of habitat disturbance ». Dans ECOSUD 2007. Southampton, UK : WIT Press, 2007. http://dx.doi.org/10.2495/eco070211.

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Laksanahati, Tri Yastuti, Widowati, Sapto Purnomo Putro et Satriyo Adhy. « Mathematical analysis of the nitrogen and phosphate to phytoplankton, macrobenthos, and sediment in aquaculture system ». Dans THE 3RD INTERNATIONAL CONFERENCE ON SCIENCE, MATHEMATICS, ENVIRONMENT, AND EDUCATION : Flexibility in Research and Innovation on Science, Mathematics, Environment, and education for sustainable development. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0105901.

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Rapports d'organisations sur le sujet "Macrobentho"

Jak, Robbert, et Sander Glorius. Macrobenthos in offshore wind farms : a review of research, results and relevance for future developments. Den Helder : Wageningen Marine Research, 2017. http://dx.doi.org/10.18174/415357.

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Rozemeijer, M. J. C., et S. Smith. Deskstudie naar de mogelijke effecten van sedimentatie bij overvloei door zandwinning op macrobenthos nabij de -20 m diepte. IJmuiden : Wageningen Marine Research, 2017. http://dx.doi.org/10.18174/429102.

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Macrobenthic organisms on the Scotian Shelf, CSS Hudson mission 94-032, November 15-25, 1994. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/203752.

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