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 72 for “"Benthic communities"”.
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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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Effects of copper on benthic communities in artificial microcosms
… were colonization and growth of periphyton communities in artificial streams, community composition and nutritional content of periphyton in these streams, leaf conditioning and nutritional content in laboratory microcosms, and nutritional suitability of these leaves to a shredding …
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Spatial models of metapopulations and benthic communities in patchy environments
… study the dynamics of metapopulations and marine benthic communities in patchy environments. All the models have the form of a discrete-time Markov chain, and assume that the landscape is composed of discrete patches, each of which is in one of a number of possible states. The state of a patch is …
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Pollution effects on body mass distributions of freshwater benthic communities
… between water quality and body size patterns in benthic communities in order to establish the potential of size based indicators for assessing environmental condition, as well as testing Holling’s (1992) proposition that lumpiness occurs in body size distributions across a broad range of spatial …
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Investigating and modelling the body size structure of benthic communities
Benthic communities were investigated in terms of their body size distributions at three environmentally contrasting study sites: (i) a shallow-water location on the Fladen Ground, North Sea, (ii) a deep-water location in the Faroe-Shetland Channel and (iii) and a mid-slope oxygen minimum zone …
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Flamingo predation impacts on benthic communities: effects of spatial gradients
… (Phoenicopterus ruber) predation impacts on the benthic macrofaunal community structure in an intertidal sandflat ecosystem in South Africa. P. ruber is a benthic filter-feeder known to feed on benthic dwelling invertebrates through pit formation, where deep sediments are stirred up by trampling …
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Biologically induced alternative states in two rocky subtidal benthic communities
This thesis is concerned with the contrasting communities that occur in the subtidal zones of two closely situated islands in Saldanha Bay on the west coast of South Africa: Both are guano islands, supporting substantial populations of seabirds. They have a similar bottom topography and experience …
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Influences of the abalone Haliotis midae on subtidal benthic communities
… of (a) dietary studies, (b) comparisons of communities living on shell versus surrounding rock substratum, and (c) removal experiments using field exclusion/inclusion plots.
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Biovolume and ecoguild analysis of Late Paleozoic Ice Age benthic communities.
… guild analysis are employed to analyze three benthic paleocommunities from the Pennsylvanian (Late Carboniferous) of Texas. Two in situ bulk samples were extracted from the lower and upper sections of shale strata to assess change in benthic communities over time. The results indicate …
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The impact of macrophyte mats on biodiversity and ecosystem functioning of benthic communities
… Ulva spp., are a common disturbance to estuarine benthic fauna worldwide. As large quantities of macroalgae break free from growing substrates, drifting mats are formed that eventually deposit in low energy environments, including intertidal sandflats. The mats will typically settle on 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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Investigations into the functioning of phytoplankton, zooplankton, kelp and benthic communities at the Prince Edward Islands
… Several questions pertaining to the marine communities at the Prince Edward Islands are addressed. Firstly, the nature of the 'island-mass effect', and the cause of the frequently recorded diatom blooms in the area are examined. It had been suggested that the cause of the blooms is related …
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The effects of area and surface complexity on the structure and formation of stream benthic communities
… as islands. A sampling of macroinvertebrate communities found on a series of rocks 31 to 1000 cm² in surface area, produced a Log species- Log area curve with a slope of 0.352. This slope could not be compared to Preston’s prediction of a slope value of 0.17 or 0.27 because individuals in …
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Predation/disturbance effects of greater flamingos (Phoenicopterus ruber) on the benthic communities of two Southern African lagoons
… clear that P. ruber was important in structuring communities in the areas studied. In the absence of P. ruber, physical disturbance may be the most important force structuring benthic communities.
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The influence of ultraviolet-B radiation on benthic communities in Rocky Mountain streams with different metal exposure histories
… high elevation) that increase exposure of benthic communities to UVB (280 to 320 nm) provide an opportunity to examine how UVB interacts with metals contamination to structure benthic communities. I integrated a series of UVB addition experiments conducted in stream microcosms with a …
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Foraging Ecology of Parrotfishes in the Greater Caribbean: Impacts of Specialization and Dietary Preferences on Marine Benthic Communities
… the impacts that these herbivores have on benthic communities as both herbivores and corallivores.</p> <p>In Chapter 1, we examined how six different species of coral reef herbivores (i.e. parrotfishes), all of which belong to a single feeding guild but represent a range of dietary …
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