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 862 for “"benthic"”.
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Benthic mineralization and microscale heterogeneity
… the advances in chemical imaging to study benthic processes in systems, where the natural function of microscale heterogeneity has been ignored or improperly appreciated. The results confirm the importance of natural heterogeneity in benthic ecosystem functioning including: trace metal …
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Benthic microalgae on the Louisiana inner continental shelf: biomass, distribution, and contribution to benthic food-webs
Phytoplankton and benthic microalgae (BMA) may both contribute to the sediment organic matter pool available to benthic consumers. Recent studies have highlighted the presence and ecological roles of benthic microalgae (BMA) on the continental shelf but studies from the north-central Gulf of Mexico …
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River oxygen uptake by benthic microorganisms
The factors influencing benthic microbial uptake of river dissolved oxygen (DO) and dissolved organic matter (DOM) were investigated in 4 New Zealand rivers receiving organic waste discharges from dairy factories and a pulp and paper company. A chamber system for in situ use was developed and …
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Lake Benthic Algal Production and Extracellular Material
… its importance to the lake as a whole. Benthic extracellular material, shown to be important for food web dynamics and stabilization of the surrounding ecosystem in the marine intertidal, is even less frequently studied in lakes. I examined the environmental and community level drivers …
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Paleoecology of some upper Pennsylvanian benthic invertebrates
Digitized by Kansas Correctional Industries
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Detecting anthropogenic impacts on estuarine benthic communities
… and heavy metal contamination) on estuarine benthic communities. Using Gradient Forest analysis, I explored the relative importance of environmental factors, operating across multiple spatio-temporal scales, in influencing patterns of compositional turnover in estuarine benthic …
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Benthic Macroinvertebrate Susceptibility to Trout Farm Effluents
The direct effects of a Virginia trout farm on benthic macroinvertebrates were examined using multiple approaches. Static laboratory tests with the amphipod, Hyallela azteca, were conducted with exposures to water taken from a spring, effluent above a sedimentation basin, and effluent below a …
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Ecology of benthic macroinvertebrates in experimental ponds
… mg DW/sampler/yr for Odonata. Comparison of the benthic macroinvertebrate community at the end of year 1 to the benthic macroinvertebrate community at the end of year 2 showed no significant differences for community summary measures (total density, taxa richness, diversity, Bray-Curtis …
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Early life-history ecology of Arctic benthic invertebrates
In this dissertation I explore the abiotic and biotic factors impacting early life-history bottlenecks in 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 …
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Active and Passive Settling By Marine Benthic Nematodes
… participate in the settlement of marine benthic nematodes. The settling rates of three estuarine benthic nematode taxa were examined in a linear flume using two treatments defined by the type of sediment bed placed in the flume. One treatment bed contained sediments rendered …
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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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A Multimetric Benthic Index for Georgia's Wadeable Streams
<p>Using an ecoregional approach, multimetric indices were developed to describe stream condition in each geographically distinct region of Georgia. Collected from predetermined reference and impaired condition streams, macroinvertebrate data were used to develop multimetric indices. Multimetric …
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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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Comparing Reef Bioindicators on Benthic Environments off Southeast Florida
A goal of the U.S. Environmental Protection Agency is to develop protocols applicable to coral reefs to distinguish between the effects of local water quality and those associated with regional to global environmental change. One test case is the current-dominated southeast coast of Florida where …
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Biomonitoring an Impacted Stream Using Benthic Macroinvertebrates and Bioassays
This study used a combination of benthic macroinvertebrate biomonitoring and single-species bioassays to monitor water quality in Wilson's Creek, Springfield, MO, for the 2-year period January 1993-December 1994. Wilson's Creek was potentially impacted by increased urbanization, agricultural …
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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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Investigation into the post-mortem transport of benthic foraminifera
Palaeoenvironmental reconstruction using foraminifera relies on the assumption that assemblages reflect the ecological conditions at the time of deposition. However, the distribution of taxa can be greatly affected by transport and reworking of tests. This is particularly important in high energy …
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