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 10 of 10 for “"benthic invertebrate communities"”.
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The Study of Benthic Invertebrate Communities in: -(a) Lotic Eutrophic Waters (b) A River in Stages of Recovery from Past Pollution
… water quality on the recovery of the macro-invertebrate structure of the benthic communities has been studied, noting changes in the community structure and membership. Benthic macro-invertebrate communities living under different regimes of eutrophication in experimental streams and in …
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Spring-fed streams in Virginia and assessment of livestock impacts
The first of two studies surveyed fish communities and habitats in first-order spring streams in Virginia. Springs exhibited low species (3.3) and trophic guild (2.5) richness, and fish densities averaged 0.47 individuals/m². Two species, blacknose dace (Rhinichthys atratulus) and sculpins (Cottus …
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Linkages between Marsh Fragmentation, Prey Availability, and Blue Crab (<i>Callinectes sapidus</i>) Abundance and Mortality
… nursery habitats for many commercially important invertebrate species, yet these marshes are being lost worldwide at an unprecedented rate due to subsidence, erosion, climate change, and human activity. As marsh is lost, it creates the opportunity for submerged aquatic vegetation (SAV) …
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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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Modelling and managing the effects of trout farms on Cape rivers
… indicated that the impact of the farms on the benthic invertebrate communities of the rivers ranged from mild to severe, based on the degree of change in the structure of the communities form upstream to downstream of the effluent outlets. Those farms situated on mountain streams had the …
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Deep water parapagurid hermit crabs: their distribution, abundance, population structure and associations in the Southern Benguela
… 1910) dominate South African deeper-water benthic invertebrate communities. Samples from the 2016 DAFF bi-annual hake demersal research trawl surveys provided data on population structure and morphology. Since these species forego the use of "traditional" gastropod shells in favour of …
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Evaluation of approaches for the derivation of defensible sediment quality guidelines for application at Saskatchewan uranium operations
… in sediment to aquatic organisms, specifically benthic invertebrates. The objectives of this research were to evaluate SQGs derived specifically for use by the uranium industry in Canada, propose alternative SQVs for use at uranium operations in northern Saskatchewan using a novel approach, and …
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Effects of native forest and pastoral land use on the population dynamics and trophic role of the New Zealand freshwater crayfish Paranephrops planifrons (Parastacidae)
… water quality, physical habitat, and fish and benthic invertebrate communities of New Zealand streams, but the impact of land use change on crayfish populations is unknown. The population dynamics, growth, and diet of crayfish in Waikato pastoral streams were compared to crayfish inhabiting …
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Population trends and ecological community interactions of freshwater mussels
… ways freshwater mussels affect wider freshwater communities, discussed in Chapters 4-6. Finally, in Chapters 5 and 6 I consider the possible implications of changes to mussel populations for freshwater communities. I begin by exploring the changes that have occurred in freshwater mussel …
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Effects of environmental warming on lentic freshwater communities and the behavioral and physiological responses by fishes to warming
… understanding the impacts of warming on aquatic communities and organism success is important. Many studies have examined the effects of future climate warming using a variety of experimental methodologies. Findings support a multitude of direct and indirect factors that will shape biotic …