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 14 of 14 for “"autotrophs"”.
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Nutrient Limitation of Upper Great Lakes Periphyton across Large Spatial and Environmental Gradients
… suggest that the limitation status of nearshore autotrophs may differ than that of offshore autotrophs (that are phosphorus limited in the Upper Great Lakes), and that anthropogenic nutrient loading has relieved nutrient limitation of periphyton in more impacted areas of the Upper Great Lakes. …
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Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… indistinguishable from those of surrounding autotrophs and mainly associate with Rhizoctonia species; partial myco-heterotrophy, where green orchids have carbon isotope signatures intermediate between those of autotrophs and myco-heterotrophs and associate with ectomycorrhizal fungi; full …
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Linking Heterotrophic Metabolism and Nutrient Uptake in Headwater Streams
Autotrophs and heterotrophs differ in their demand, acquisition and use of materials, but fundamentally nutrient demand is inherently linked to metabolism based on the stoichiometry of biochemical reactions. The differences between these two groups of organisms confound straightforward regression …
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Dynamics of baseline stable isotopes within a temperate coastal ecosystem: Relationships and projections using physical and biogeochemical factors
… at or near the base of the food web (e.g. autotrophs and their consumers), which act as basal reference points from which to calibrate inferences. Therefore, understanding variations in isotopic baselines, and the mechanisms leading to their variability, is crucial for food web ecology. …
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Ecology and biogeochemistry of fluvial microphytobenthic communities on soft sediments
… hinted at a change in interactions between autotrophs and heterotrophs, and indicated the first known example of shifting facilitation/competition found in MPB communities on natural sediment. Potential nutrient flux was also shown to vary between geology and light levels, with differences …
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METHYLATED AMINE-UTILISING BACTERIA AND MICROBIAL NITROGEN CYCLING IN MOVILE CAVE
… sulfur oxidisers appeared to be the dominant autotrophs in Movile Cave.
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Western Pacific paleoceanography across the Early–Middle Pleistocene boundary (~773 ka, Marine Isotope Stage 19): Dinoflagellate cysts of the Chiba composite section, Japan.
… and corresponding increase in warm-water autotrophs (e.g. Spiniferites hyperacanthus/mirabilis, Spiniferites sp. 2) indicate a progressive decline in productivity corresponding to deglaciation and a transition from cold nutrient-rich waters of MIS 20 to warm conditions in MIS 19. This …
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Using Oligonucleotide Probes to Characterize Nitrification in a Two-Stage Pilot Scale Biological Aerated Filter System
… to be competition between heterotrophs and autotrophs.
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Oligotrophication of downwind boreal lakes caused by oil sands-derived enhanced nutrient deposition
… since the mid-1900s. Biomarkers from obligate autotrophs, and sedimentary δ13C and δ15N values, changed asynchronously among lakes, reiterating a fundamental restructuring of the algal community. These patterns suggest that regional climate change has intensified primary production in …
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Nano- e microfitoplâncton da Baía de Guanabara (RJ, Brasil) em condições tróficas distintas: aspectos estruturais e pré-funcionais
… magnitude higher at Ramos, where cell density of autotrophs varied around 10^7 - 10^9 cells. L^-1 for the nanoplankton and 10^5 - 10^7 cells. L^-1 for the microplankton, while biomass values varied around 10^2 - 10^3 μgC. L^-1 and 10 - 10^3 μgC. L^-1, respectively. At Urca, lower relative and …
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Freshwater Invertebrate Assimilation Nutrients from Detrital Biofilms Under Light and Phosphorus Manipulation
<p>Anthropogenic influences are increasing algal biomass and activity within aquatic ecosystems, stimulating debate regarding interactions between “green” and “brown” food webs. Specifically, in forested streams, the removal of forest canopy or riparian zones increases light exposure and nutrient …
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Comparative whole genome transcriptional responses of Ruminococcus albus strain 7 and 8: a case for specialization and niche differentiation
… the canonical pABA synthetic pathway are likely autotrophs and not auxotrophs. Notably, the potential long non-coding RNA (lncRNA) loci was identified in the genomes of R. albus strains. The putative lncRNA loci consisted of four sequence components; lncRNA, DUF1292 gene, putative 6S RNA, and …
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Food web regulation under different forcing regimes in shallow lakes
… ecosystem scale. Thus, all types of organisms, autotrophs and heterotrophs, at all trophic levels were investigated to gain a comprehensive overview of the effects of the two mentioned altered forcing regimes. In addition, an extensive evaluation of the trophic interactions and resulting carbon …
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An investigation into the fundamental understanding of an activated sludge bioremediation process and optimisation of thiocyanate and cyanide destruction
… spp. Metabolic predictions indicated the autotrophs, gaining energy from the oxidation of reduced sulphur intermediates produced during SCN destruction were the dominant community members. The potential for ammonium oxidation and denitrification within the microbial community was …