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 26 for “"Assemblage Composition"”.
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Patterns of arthropod distribution and determinants of arthropod assemblage composition in a natural West African savannah
… were studied in more detail considering the ant assemblages on the myrmecophilic tree Pseudocedrela kotschyi. Herbivore-plant interactions were investigated on a multiple-species level (interrelationships between herbivores and Pseudocedrela trees) and on a species level (detailed studies of …
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Diazotroph Assemblages of Salt Marsh Plants Growing Along An Environmental Gradient: Assemblage Composition and Responses to Environmental Conditions
… ecologically significant. The diazotroph assemblages associated with the rhizosphere of <em>S. alterniflora</em> have been found to be highly diverse, mostly consisting of novel taxa, and relatively stable. The culturable O<sub>2</sub> utilizing diazotrophs associated with other wetland …
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Spatial and temporal distribution of larval fishes in a large tidal river.
There are few published studies of larval fish assemblages from unregulated, tidal freshwater rivers. Patterns in the spatial and temporal distribution of larval fishes in the Mattaponi River were examined. Sampling took place on a weekly basis from February through August, 2006 and 2007. Larval …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… substrates in sampling aquatic macroinvertebrate assemblages associated with stone dikes on the Lower Mississippi River and to obtain basic information on assemblage composition, structure, and patterns of distribution over a dike. For study purposes, stone-filled baskets were implanted into a …
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Effects of demersal trawling on marine infaunal, epifaunal and fish assemblages: studies in the southern Benguela and Oslofjord
… trawl fishery on infaunal, epifaunal and fish assemblages in the southern Benguela upwelling system for the first time. In the absence of representative areas of similar habitat protected from trawling in the southern Benguela region, infaunal and epifaunal assemblages were compared between …
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Place as Occupational Histories: Towards an Understanding of Deflated Surface Artefact Distributions in the West Darling, New South Wales, Australia
… long-term accumulated patterns in stone artefact assemblage composition within archaeological deposits with known occupational chronologies. These are derived from the dating of charcoal from heat retainer hearths. It is argued that the Pine Point-Langwell assemblages represent multiple episodes …
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Spatial distribution of anuran assemblages from Caxiuanã, Brazil : testing the riverine barrier hypothesis and the influence of life-history traits
Knowledge of community composition is essential for the understanding of biodiversity and forming effective conservation plans. In the Amazon basin, the spatial structure of animal communities has often been explained by the riverine barrier hypothesis, which assumes that large rivers act as main …
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A Change in Fish Assemblages in the Pascagoula River, MS
… United States and have seen a change in fish assemblages over time. Examination of long-term fish assemblage data show that the mainstem Pascagoula River and its two major tributaries (mainstem Leaf and Chickasawhay Rivers) have been dominated by five abundant taxa that comprise 83% of …
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Evaluating recovery in aquatic production in the Bay of Quinte: A perspective based on changes in sedimentary diatom assemblages
… approach, I tracked changes in the diatom assemblage composition and abundance over time, to assess the cumulative impact of environmental stressors on diatom production and assess ecosystem recovery. Diatom assemblages were identified in two sediment cores taken from the middle and lower …
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Stone tools and sand veld settlement
… Considerable variation was found to exist in assemblage composition and site density within an area stretching between the coast and the fringes of the Cape Fold Belt mountains. A number of open sites were sampled in different contexts across the research area and detailed analyses of 21 …
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Patterns in Fish Community Structure in a Regulated River
I examined the abundance, composition, and distribution of fish communities in the lower Roanoke River, a hydropeaking system in North Carolina. Fishes were sampled at before and after peaking events over three years; 2007 to 2009. I evaluated trends in species richness, diversity, and assemblage …
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Patterns in reef fish assemblages as determined by baited remote underwater video (BRUV) along the western side of False Bay: effects of site, depth and protection status
… an understanding of the patterns of species composition, abundance, and distribution, allows monitoring efforts to be focused, efficient, and properly interpreted. Baited remote underwater video (BRUV) was used to examine the effects of site, depth, andlevel of protection, on the diversity …
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Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic
… limnological variables and in terms of diatom assemblage composition. Diatom species distributions from Melville Island can best be explained by differences in pH and related variables. Secondly, ponds and lakes located in a High Arctic oasis on northern Ellesmere Island, recorded significantly …
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Headwater Stream Biofilm Structure and Function at High Resolution Spatial-temporal Scales.
Spatial and temporal patterns in benthic diatom assemblage composition and chlorophyll-a production were investigated over a 25 month period within three headwater sub-catchments of the River Eden catchment, NW England. This was undertaken as structural and functional attributes of headwater stream …
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Interactions between titanium dioxide nanoparticle exposure and grazing organisms on periphyton biomass and community composition.
… decreased periphyton biomass and altered algal assemblage composition. In the glide section where fish grazing was present, there were significant effects of high concentrations of TiO₂NP on algal and bacterial community composition regardless of grazing pressure. There was a nonadditive effect …
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Microbial and metazoan effects on nutrient dynamics during leaf decomposition in streams
… cycling by heterotrophic microbes during leaf decomposition in streams. My research addressed two overarching questions: 1) how do exogenous and endogenous factors interact to drive microbial nitrogen (N) cycling during organic matter decomposition in stream ecosystems, and 2) what affect will …
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Lichens Of Ultramafic Rocks: A Multidisciplinary Approach To Understanding The Ecology Of An Understudied Organism In A Well-Studied System
… reported from ultramafic rocks and soils. Lichen assemblages of ultramafic substrates vary in composition and are dominated by acidophytic (low pH preferring) taxa with a minor, but consistent, basiphytic (high pH preferring) component. Species lists from ultramafic habitats in different …
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Community and memory at the Late Valdivia site of Buen Suceso, Ecuador
… is addressed through an analysis of the material assemblage the Late Valdivia (2400-1800 BC) site of Buen Suceso on the coast of Ecuador. I argue that elements of earlier periods were utilized in the creation of a unique community identity at Buen Suceso that emphasized communal relationships and …
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Influence of increased sediment exposure on suspension-feeder assemblages in a temperate seagrass meadow
… the water column. As sessile suspension-feeder assemblages play a critical role in marine ecosystems through their active transfers of organic and inorganic between the water column and the seabed (i.e. benthic-pelagic coupling), increased sediment exposure generated by anthropogenic activities …
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Biodiversity patterns of wetland macroinvertebrate assemblages in the South-Western Cape, South Africa
… patterns of wetland macro invertebrates assemblages in the south-western Cape, South Africa. 140 wetlands were sampled in four geographic clusters, the Cape Flats, the West Coast, the Cederberg and the Agulhas Plain. Open-water, submerged vegetation and emergent vegetation habitats were …
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