Global ETD Search
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Showing 1 to 20 of 57 for “"benthic community"”.
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Benthic Community Analysis of Hog Island Bay, Virginia
<p>The benthic infaunal macroinvertebrate communities of Hog Island Bay of the Virginia Eastern Shore were quantitatively sampled at 30 locations on August 31 and September 1, 1995. The primary objectives of this study were: (1) to characterize the subtidal macroinfaunal benthic communities of Hog …
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Seasonal Variation in Benthic Community Structure in Mobile Bay, Alabama.
The community concept in benthic marine ecology has long been a subject of intense interest. Peterson (1918) was one of the first investigators to recognize and attempt to characterize benthic com- munities in his extensive surveys of the Skagerrak and Baltic Sea. According to Thorson (1957), …
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Benthic Community Responses to Hypoxic Conditions in the Lower Rappahannock River, Virginia
… of seasonal low dissolved oxygen conditions upon benthic macroinvertebrate communities were studied in the lower Rappahannock River, a tributary of the Chesapeake Bay. Benthic communities were sampled during March, June, August, and September 1993 at five equidistant depths (5, 10, 15, 20, and 25 …
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Gradients in benthic community structure and bioturbation potential along the Nordic Seas continental margin
… of contrasting fluxes of organic matter on benthic community structure and function within the deep waters of the region were investigated. Previous studies have sampled the macrofaunal community throughout the region but it is difficult to draw comparisons between studies due to differences …
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Benthic Community Structure Response to Flow Dynamics in Tropical Island and Temperate Continental Streams
… in the structure and function of aquatic benthic communities. Human activities and the increased demand for freshwater have caused the modification of natural flow regimes worldwide. Hydrological alterations, such as dams, diversions, and channelizations, are associated with ecological …
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Interactions between ecosystem engineering by burrowing sandprawns (Callichirus kraussi) and nutrients: consequences for benthic community structure and ecosystem functioning
… this process drives ecosystem functioning and community structure either individually, or interactively with other processes, is however, limited, particularly in shallow soft- littoral ecosystems. At a local level, such systems are dominated by allogenic engineers such as the burrowing axiid …
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Terrestrial-aquatic transfers by hippopotamus (Hippopotamus amphibius): effects on food web and benthic community structure of the St Lucia Estuary, iSimangaliso Wetland Park, World Heritage Site, South Africa
… the influence of hippo dung on food web and benthic community structure in the St Lucia Estuary - a subtropical estuarine lake on the east coast of South Africa. It was hypothesized that experimental dung enrichment at high levels would result in significant declines in benthic community …
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Assessment of predation by the West Coast rock lobster (Jasus lalandii) : relationships among growth rate, diet and benthic community composition, with implications for the survival of juvenile abalone (Haliotis midae)
This thesis focused on two aspects of predation by the West Coast rock lobster (Jasus lalandii). These were (1) the problem of slow growth currently observed in adult male rock lobsters and the putative link between growth rate and food availability, and (2) the influence of rock-lobster predation …
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A study of benthic invertebrate community structure in selected areas on the continental shelf off KwaZulu-Natal, South Africa
… aim of this study was to investigate changes in benthic community structure and to assess how they relate to environmental factors using multivariate and distributional techniques.
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Long-term changes in the benthic macrofauna of Saldanha Bay
… aims of this study were to determine whether the benthic macrofaunal communities in the Bay have been altered over this period and to explore the benthic community patterns within the Bay prior to and after harbour development.
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Comparison of Quantitative and Semi-Quantitative Assessments of Benthic Macroinvertebrate Community Response to Elevated Salinity in central Appalachian Coalfield Streams
… with semi-quantitative sampling to characterize benthic macroinvertebrate community response to increased salinity caused by surface coal mining. These protocols require subsampling procedures and identification of fixed numbers of individuals regardless of organism density, limiting measures of …
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Investigating the cause(s) of benthic macroinvertebrate community impairment downstream of two Saskatchewan uranium operations
Past monitoring has noted benthic macroinvertebrate community impairment downstream of both the Key Lake and Rabbit Lake uranium operations in northern Saskatchewan, Canada. The objective of this research was to try to identify the cause(s) of these impacts using a weight-of-evidence approach. …
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Spatial and temporal distribution of the benthos in the Mfolozi-Msunduzi Estuary, KwaZulu – Natal
… the subtidal component of the invertebrate benthic fauna and to investigate spatial and temporal distribution of the fauna. Samples were collected quarterly in 2009 to investigate seasonal patterns of the benthos of the system. Another aim of this study was to determine the benthic biomass …
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Experimental studies of interactions between Zostera marina and the associated benthic fauna
… and seasonal changes in abundance of the benthic infauna within an eelgrass bed; (2) Observe what immediate effects occur to the benthic community as a result of experimental removal of eelgrass plants from plants within the Zostera bed; (3) Measure the seasonal variation of eelgrass …
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Organism -sediment interactions: The role of seabed dynamics in structuring the mesohaline York River macrobenthic community
… but effects of disruption of this interface on benthic biology are poorly resolved. For this study, I investigated effects of prevalent gradients in seabed disturbance processes and associated seabed characteristics on estuarine benthic community structure and function in the mesohaline York …
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Ecosystem effects of a rock-lobster 'invasion': comparitive and modelling approaches
… assumed to have had serious consequences on the benthic community and associated fisheries. To investigate these effects, I used both empirical and modelling approaches. Based on field studies, I first analysed temporal changes in rock lobsters and the benthic community at two lobster-invaded …
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Análisis Ecotoxicológico Integrado de la Contaminación Marina en los Sedimentos de la Costa De Murcia: El Caso de Portmán, Sudeste - España
… and patterns of macro invertebrate community composition along the contamination gradient were also studied. Multivariate analyses indicate a strong relationship between sediment metal concentration, toxicity and benthic community structure.
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Distribution and abundance of soft-sediment intertidal Polychaetes
… important components of the intertidal sandflat community in Lawson’s Flat, Dillon Beach, California. Little is known about the factors that control the relative abundance of these species. In view of the extensive evidence of the importance of interactions between component species in intertidal …
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Biovolume and ecoguild analysis of Late Paleozoic Ice Age benthic communities.
… data, and conventional techniques for assessing community composition often fail to account for taxa that disarticulate readily post-mortem adequately. In this study, biovolume estimation techniques and ecological guild analysis are employed to analyze three benthic paleocommunities from the …
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Macroinvertebrate Community Structure as an Indicator of Watershed Health in the Upper Trinity River Basin, North Central Texas
This study describes macroinvertebrate community structure and assesses its potential in detecting point and non-point sources of disturbance associated with rural and urban areas in the Upper Trinity River Basin. Geospatial techniques were used to quantify landuse within the watershed in a GIS. At …
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