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.
Results
Showing 1 to 20 of 24 for “"Heterotrophy"”.
-
Physiological studies of phototrophy and heterotrophy in two algae with contrasting nutritional characteristics, Pyrenomonas salina (Cryptophyceae) and Poterioochromonas malhamensis (Chrysophyceae)
… were found in the relative contribution of heterotrophy to their overall nutrition and the physiological response of their photosynthetic systems to changes in nutritional mode. These differences indicate that the physiological mechanisms involved in integrating autotrophic and heterotrophic …
-
Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… 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 myco-heterotrophy, where orchids have lost the ability to photosynthesize, …
-
Plastid Genome Evolution in the Parasitic Genera Cuscuta (Convolvulaceae) and Krameria (Krameriaceae)
… species, diverse in terms of the degree of their heterotrophy: some can conduct limited photosynthesis whilst others are entirely nonphotosynthetic. In chapters 2-4, I assembled and analyzed plastomes from each section of Cuscuta in order to comprehensively characterize the patterns in their …
-
Exploring the climate change refugia potential of equatorial Pacific coral reefs
… in coral response to elevate CO2 conditions: Heterotrophy yields larger corals but CO2 sensitivity is independent of feeding. Conversely, factors that enhance zooxanthellate photosynthesis (light and DIN) reduce CO2 sensitivity. Corals under higher light also store more lipid but these …
-
Exploring the climate change refugia potential of equatorial Pacific coral reefs
… in coral response to elevate CO2 conditions. Heterotrophy yields larger corals but CO2 sensitivity is independent of feeding. Conversely, factors that enhance zooxanthellate photosynthesis (light and DIN) reduce CO2 sensitivity. Corals under higher light also store more lipid but these …
-
Understanding the microbiota in drinking water distribution networks – from municipal to indoor water supply systems
… related to methano-/methylotrophy and aerobic heterotrophy. Despite that, the biofilm community differed from the suspended community by specific core populations and lower diversity and evenness. Multivariate tests indicated seasonality as the main contributor to community structure variation. …
-
Occurrence and Growth Characteristics of Algae Isolated From Shallow Wells, Deep Wells, and Springs in Northwest Arkansas and Southwest Missouri
… these wells were used in an investigation of heterotrophy. These strains were cultured in media supplemented with mannitol, glucose, fructose, and sucrose to see which substrate or substrates best supported heterotrophic growth of the algae. Of the substrates tested, glucose and fructose …
-
Stress-induced alterations in ecosystem function: the role of acidification in lotic metabolism and biogeochemistry
… between acid and circumneutral streams. Reduced heterotrophy in acid streams was apparent in lower whole-stream respiration rates, less ability to process organic carbon, and little response of N uptake to added carbon resources. Overall, acid-induced stress in streams was found to impair …
-
Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… for 24 and 60 hours respectively, with a maximum heterotrophy of 44 (±17) mmol m2 d1. Overall, the summer season featured a net autotrophic metabolic balance of +27 mmol m2 d1 .thus highlighting the importance of the region for net carbon sequestration. Finally, this thesis also demonstrates the …
-
Microscale Variation in Light Intensity and its Effects on Growth of Juveniles of the Temperate Coral, Oculina Arbuscula
… can compensate for reduced light levels through heterotrophy. Growth rates were found to be highest for juveniles oriented at 0° and were independent of the presence or absence of a food source. Chlorophyll concentrations and algal densities on the other hand, were higher at all angles of …
-
Integrated Model-Based Impact Assessment of Climate Change and Land Use Change on the Occoquan Watershed
… promote decreased oxygen solubility and greater heterotrophy. Moreover, longer anoxic conditions are projected at the bottom of the reservoir. Results indicate that higher water temperature will increase the denitrifying capacity of the reservoir, especially during summer months, further reducing …
-
Bioluminescence in dinoflagellates – diversity, molecular phylogeny and field ecology
… performing key process such as photosynthesis, heterotrophy and toxin production. Some dinoflagellates are also capable of producing bioluminescence and they are the most abundant protists that produce light in the surface waters of the oceans. This<br/>study employed molecular tools to …
-
Latitudinal variation in plankton size spectra along the Atlantic Ocean
… of the balance between net autotrophy and heterotrophy.<br/>
-
Biological oxygen production from oxygen-to-argon ratios and oxygen isotopologues in the Atlantic Ocean
… mmol m-2 d-1, followed by a short period of net heterotrophy and finishing at 5 mmol m-2 d-1. These changes were associated with changes in the species composition, with diatoms dominating first followed by the increase of nanophytoplankton. These techniques show O2/Ar and O2 isotopologues to be …
-
Biogeochemical controls on ammonium accumulation in the surface layer of the TD: Southern Ocean
… also because the ambient conditions favour net heterotrophy and NH₄⁺ accumulation. High wintertime surface NH4 + concentrations, and the drivers of biological NH4 + cycling, may also have implications for nitrate uptake, through inhibition, and for the air-sea flux of ammonia gas, with the …
-
Ecology and Molecular Phylogenetics of <i>Hydnora</i> (Hydnoraceae) in Southern Africa
… loss, parasite-host mineral relationships, and heterotrophy were evaluated for <em>Hydnora </em>. Transdermal water loss in <em>Hydnora</em> ranged from 0.14±.02 to 0.38±.04 mg cm<sup>-2</sup> hr<sup>-1</sup>, comparable to transpiration rates recorded for xerophytes. Concentrations of P and K …
-
Purification and properties of some fresh water and marine cyanobacteria belonging to the orders Chamaesiphonales and Pleurocapsales
… nitrogen sources; temperature relationships; heterotrophy; pigment composition; and mean DNA base composition. There were no clear-cut correlations between genera defined in terms of developmental patterns and groups defined in terms of any of the physiological and chemical properties …
-
A multi-scale assessment of aquatic ecosystem processes across the land-ocean-atmosphere continuum: from headlands to the sea
… organic matter (OM) fuels a state of net heterotrophy and CO2 supersaturaton in the world's rivers, resulting in a globally-relevant flux of CO2 to the atmosphere. I examined the complex sequence of processes resulting in fluvial carbon fluxes at various spatiotemporal scales in a range of …
-
Carbon metabolism and dissolved organic carbon (DOC) fluxes on seagrass communities: insights from plant colonization states, eutrophication and global change related factors
… Cymodocea nodosa moved from autotrophy to heterotrophy in certain seasons of the year and could increase or decrease the DOC release. The response of seagrass communities when subjected to a pH decrease was complex and showed to be species-specific. The pH decrease triggered a significant …
-
Oxygen, pH, and labile organic carbon as possible mechanisms for algal stimulation of bacterial and fungal production in periphyton
<p>Algal photosynthesis can stimulate production of associated microbial heterotrophs; however,the mechanisms for this stimulation remain unknown. I incubated submerged Typha domingensis leaf litter in greenhouse mesocosms under low- and high-nutrient regimes and conducted microbial production …
Page 1 of 2