Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Benthic community structure"”.
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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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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 lotic ecosystems are influential 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, …
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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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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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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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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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The Trophic Ecology of Psammechinus miliaris in Scottish Sea Lochs
… the impact the sea urchin grazinghas on benthic community structure. These studies revealed that grazing of P. miliaris can have a major influence on the biomass and structure of the benthic invertebrate<br/>communities. The biochemical analysis of trophic proxies was used to quantify the …
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Transient structure in benthic communities : the effects of oxygen stress, burial and high rates of sedimentation
… parameters on three components of transient benthic invertebrate community structure: abundance of individuals and species, biomass of individuals, and species diversity, were investigated in this study. The effect of low dissolved-oxygen on transient benthic community structure was studied …
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Changes in food web structure and energy flow in kelp forest ecosystems on the south-west coast of South Africa following the invasion of Jasus lalandii
… and resulted in a complete change in the benthic community structure, changing from one state dominated by herbivores and encrusting algae, to another state dominated by lobsters, sessile species, kelp and understory foliose algae. Using the trophic modelling software Ecopath with Ecosim, …
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Temporal interactions with flamingo foraging plasticity: ecological effects on basal resources and benthic heterogeneity
… particularly by shorebirds, and consequences for benthic community structure, heterogeneity and ecosystem functioning have been limited in marine soft-sediments. Temporal interactions with foraging plasticity is an even greater knowledge gap. The primary goal of this dissertation was to expand on …
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The Effects of Benthic Organisms on Intertidal Sediment Erodibility
… erosion of surface sediments is also vital to benthic-pelagic coupling, where resuspended microbes and organic material become available to suspension feeders and/or transported to adjacent habitats. On sandflats, the organisms living within sediments have been proven to be key drivers of …
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Marine Biodiversity of Antarctic Hard Rock Communities: Species Biomass and Energy Use
… evaluated in the same location. To do this all benthic organisms greater than 3mm in size were collected at 6m, 12m and 20m depth from three transects near Rothera Point, Adelaide Island (67° 34’ S, 68° 07’ W) in the summer and winter of 2015. Organisms were identified and their wet, dry and ash …
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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. …