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 20 of 57 for “"Benthic invertebrates"”.
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Paleoecology of some upper Pennsylvanian benthic invertebrates
Digitized by Kansas Correctional Industries
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Early life-history ecology of Arctic benthic invertebrates
… the Arctic Ocean and Woods Hole, MA. Many marine invertebrates have a biphasic life-history, with larvae that disperse in the water column then settle to the seafloor. Extreme population bottlenecks occur at larval and juvenile stages, which fundamentally alter adult communities. Yet, marine early …
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FACTORS CONTROLLING NICKEL BIOAVAILABILITY AND EFFECTS ON BENTHIC INVERTEBRATES IN HARDWATER FRESHWATER STREAMS
… mesocosm Ni experiments indicated that benthic communities (Ephemeroptera, abundance, taxa richness) responded negatively to increasing SEM<sub>Ni</sub>/AVS and (SEM<sub>Ni</sub>-AVS)/ƒoc models (increasing Ni bioavailability), and these communities demonstrated a sediment type …
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The impact of green macroalgal mats on benthic invertebrates and overwintering wading birds.
… Poole Harbour. 2) Analysing any changes to the benthic invertebrate community under varying macroalgal mat densities. 3) Observing and recording the behaviour and feeding success of key wading bird species; in particular how they responded to changes in prey availability and varying levels of …
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Tolerance Determination of Certain Benthic Invertebrates as Indicators in River Water Quality Monitoring
… Water quality has been correlated with benthic macroinvertebrate distribution and alteration in community structure, with specific regard to caseless Trichopteran distribution recorded. Organic pollution, R. Tean, Staffordshire, and heavy metal pollution, R. Ystwyth and R. Rheidol, have …
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What is the best chemical approach to estimate the bioavailability of pyrethroid insecticides to benthic invertebrates?
… in sediments at concentrations lethal to benthic species. This research has four specific goals: Determining exposure conditions that may change the concentration on the SPME fibers at equilibrium (Chapter 2); Comparing the ability of SPME fibers and Tenax to predict the bioavailability of …
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Spatial distribution and diversity of soft-bottom benthic invertebrates from demersal trawl surveys off the coast of Namibia
… distribution and diversity of soft-bottom benthic invertebrates collected during the Ministry of Fisheries and Marine Resources' annual monkfish, hake, and deep-sea red crab demersal surveys for the years 2018-2020, along the northern, central, and southern coast of Namibia. The study aimed …
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Modeling Size Dependent Interactions of a Juvenile Piscivore: Implications for Growth and Survival
… were offered different prey types (zooplankton, benthic invertebrate, or fish) separately, consumption was influenced by walleye size and prey density. However, foraging patterns varied with relative prey availability when all three prey types were available simultaneously. Small juveniles (20 …
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Aquatic toxicity of one dimensional carbon nanomaterials
… CNT in water were toxic to all four benthic invertebrates. CNTs spiked into sediments were mildly toxic to amphipods reduced in toxicity. During exposures, the test organisms were coated with the CNMs and the organisms also ingested and accumulated these CNMs in their guts. Overall, …
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Trophic polymorphism in the Arctic charr (Salvelinnus alpinus (L.)) of Lochs Rannoch, Ericht and Tay, Scotland
… to the pelagic morph previously described, the benthic morph previously described consists of two distinct morphs. Thus one form had a relatively small head, short gill rakers and consumed only benthic invertebrates, whilst the other had a relatively large head and consumed benthic invertebrates …
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Selenium bioaccumulation and speciation in the benthic invertebrate Chironomus dilutus: an assessment of exposure pathways and bioavailability
… to the bioaccumulation of selenium at the benthic-detrital link of aquatic food webs. To fulfill this objective, laboratory and in situ field experiments were conducted using the benthic invertebrate Chironomus dilutus to identify the exposure pathway(s) and selenium species associated with …
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Foraminiferal species distributions and sedimentological dynamics of the Knysna Estuary, South Africa
… since it has the richest fauna of the larger benthic invertebrates of any of the South African estuaries and it is open to the sea throughout the year.
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Benthic invertebrate management in plastic-lined fish culture ponds
… of organic substrate available to potential benthic macroinvertebrates, which are important prey for larval fish. Previous studies on plastic-lined ponds have focused on fertilization and management of zooplankton populations. Zooplankton populations are an important prey for larval fish, but …
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Quantifying the presence of current-use insecticides and toxicity of sediments in urban residential watersheds in central Texas.
… years, yet the impact of these insecticides on benthic invertebrates in urban streams is largely unknown. The objective of this study was to determine the presence and concentration of current-use pesticides in the sediments of residential streams in central Texas. Additionally, the toxicity 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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The feeding ecology of curlew sandpipers Calidris ferrugineol in the South - Western Cape, South Africa
… described. The gross annual production of the benthic invertebrates potentially available to the birds was estimated, as well as the birds' impact on this.
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Impacts of Delayed Drawdown on Water Quality and Aquatic Biota in Seasonal Wetlands of the Grassland Ecological Area, Los Banos, California
… the availability of forage vegetation and invertebrates for ducks and shorebirds. Wetland drainage contains salt, boron, and trace elements that are, in part, derived from imported surface water but also concentrate during storage in the wetland impoundments. The spring drawdown drainage …
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Benthic Population Distributions in Red Rock Reservoir, Iowa Summer 1972
The problem. To determine the distribution of benthic invertebrates in Red Rock Reservoir and to relate this distribution to the physiochemical characteristics of the substrate and bottom meter of water along with water retention time after three years of impoundment. Procedure. Benthic samples …
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