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 22 for “"Biovolume."”.
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Biovolume and ecoguild analysis of Late Paleozoic Ice Age benthic communities.
… readily post-mortem adequately. In this study, biovolume estimation techniques and ecological 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 …
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Investigation of prey ingestion and digestion in the ciliate predator Tetrahymena pyriformis and the impact on growth
… fluorescently-labelled microspheres (FLMs). Prey biovolume did not affect ingestion rates over the 5 minute period tested, therefore the effect of the different prey states could be directly compared. Live heterotrophic bacteria were able to quickly upregulate DV formation rate; something not …
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Characterization of the autotrophic component in periphyton upon <i>Typha angustifolia</i> detritus in a freshwater wetland
… location, no significant differences occurred in biovolume. Similarly, no clear evidence of successional patterns was observed.</p> <p>Although few significant interactions were observed, <em>Typha</em> detritus provided a substratum for vast numbers and biomass of periphyton. A combined density …
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Análise integrada dos espectros de tamanhos e assinaturas isotópicas da comunidade zooplanctônica ao largo do nordeste do Brasil
… em todas as áreas estudadas, porém em termos de biovolume, larvas de peixes e gelatinosos foram os mais dominantes. A análise dos espectros de tamanhos mostrou uma maior contribuição de organismos menores na plataforma continental, e uma maior contribuição de organismos maiores nos ambientes …
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Distribuição da classe Thaliacea (Tunicata) em frente a costa do estado do Rio de Janeiro
… of Thaliacea were compared wiht plankton biovolume and correlated with temperature and salinity data.
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Effects of Local Plant Neighborhood on Plant Herbivory in Perennial Polyculture Cropping Systems
… abundance, morphospecies richness, and biovolume among hayed grasslands, and wheat fields. Pollinators and detritivores were more abundant, had greater biovolume, and were more species-rich in hayed grasslands than in wheat fields. Therefore, insects may provide more pollination and …
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Ecosystem impacts of variable recruitment in Antarctic krill investigated with long-term monitoring and archived ADCP backscatter data
… parameters, the ADCP’s estimates of krill biovolume are likely to have uncertainty spanning at least an order of magnitude and therefore the ADCP cannot on its own be used to estimate absolute biovolume. However, available evidence suggested that variability in seawater properties and ADCP …
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Winter dynamics in mountain lakes and impacts of an introduced species to the endangered Devils Hole pupfish
… primary productivity rate, phytoplankton biovolume and composition, zooplankton biomass and composition, nutrient concentrations, and hypolimnetic dissolved oxygen of 10 global mountain lakes in ice-covered (winter) and ice-free (summer) seasons. Productivity was 44% lower in winter …
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The Impact of Nutrient Loading from Canada Geese (Branta canadensis) on Water Quality, a Mesocosm Approach
… in chlorophyll-a concentration or phytoplankton biovolume, there was an increase in phytoplankton counts in the high treatment group. Phytoplankton diversity (using the Shannon index of diversity) was significantly decreased by the addition of goose feces (H1'=0.575, H2'=0.433, t=l7.43, p< 0.001, …
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Studies on fungal biomass and activity associated with the decomposition of plant litter in freshwater
… a marker. Conversion factors for ergosterol and biovolume to fungal biomass were shown to vary with fungal species, age and growth conditions, but no single parameter was found which could adequately explain this. In field studies on flooded gravel pits biomass was 0.02-6.66/0 leaf dry weight …
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The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… I find that enhancement of phytoplankton biovolume at the shelfbreak front is common during the springtime, but these enhancement events are not associated with consistent changes in community size structure. I evaluate these results in the context of hypotheses generated based on my …
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Optimizing a long-term monitoring program to track toxic cyanobacteria blooms in a Great Lakes estuary
… conditions in the SLRE relate to cyanobacteria biovolume and phytoplankton community structure? (2) What temporal resolution and sampling window should a future monitoring program use, and can lagged effects of environmental conditions be used to predict cHABs? (3) What locations should be …
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Long-term spatiotemporal water quality and phytoplankton dynamics in Severn Sound, Ontario: a delisted great lakes area of concern
… Models showed decreases in total phytoplankton biovolume and different significant drivers across seven major phytoplankton divisions. Permutational Multivariate Analysis of Variance (PERMANOVA) revealed that station, along with period (before, during, and after delisting), and interaction of …
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Effects of Low Bioavailable Nitrogen and Phosphorus on Cyanobacteria Dynamics in Eutrophic Lake Erie
… was highly correlated with <i>Anabaena</i> biovolume. Genetic diversity of the <i>Microcystis</i> population was assessed during 2011 and showed that diversity was very similar spatially and temporally in spite of the wide range of N, indicating that Lake Erie <i>Microcystis</i> can survive …
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Remote Sensing of Cyanobacteria in Case II Waters Using Optically Active Pigments, Chlorophyll a and Phycocyanin
… phycocyanin concentrations and blue-green algal biovolume measurements was also observed (r2=0.95, p<0.0001).
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Seasonal and spatial variability of pelagic fishes in relation to environmental variability in St Helena Bay
… of pelagic fish density with zooplankton biovolume, chlorophyll, SST and oxygen; the GLM results showed a negative relationship between zooplankton abundance and pelagic fish (t=-1.980, p=0.049). Based on these results, it appears that the SHBML data were not able to pick up seasonal …
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Nano- e microfitoplâncton da Baía de Guanabara (RJ, Brasil) em condições tróficas distintas: aspectos estruturais e pré-funcionais
… stress. Estimates of total biomass from cell biovolume showed that the contribution of the microphytoplankton was equivalent and, at time, even greater than that of the nanoplankton, in contrast to what was indicated by the cell density data. Moreover, the heterotrophic componentes of …
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The impacts of silver nanoparticles on planktonic and biofilm bacteria
… under all conditions, and decreased biofilm biovolume per surface area when HS were not present. With HS, Ag NPs did not significantly affect biomass; however uptake of Ag NPs doubled under this condition. Ag NPs in suspension had an effect on a natural marine biofilm community. A …
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Variação da estrutura e da biomassa fitoplanctônica na Lagoa Itapeva (Litoral Norte do Rio Grande do Sul) em função da hidrodinâmica
… em função da biomassa (estimada através do biovolume), ressaltou três frações que melhor representaram a comunidade fitoplanctônica: nanoplâncton, microplâncton e netplâncton. A fração netplanctônica predominou sobre as demais frações de tamanho. A predominância desta fração sobre as outras …
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The ecology and feeding biology of thecate heterotrophic dinoflagellates
… trophic dependance. During such peaks the biovolume or biomass of the THD community exceeded that of both pigmented dinoflagellates and ciliates. Occurrence patterns of individual THD species were closely related to water temperature; this may indicate the involvement of benthic resting …
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