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 13 of 13 for “"Plankton communities"”.
-
The role of heterotrophic microflagellates in plankton communities
… of these protozoa as a trophic link between planktonic bacteria and zooplankton. The abundance of microflagellates relative to other picoplankton (0.2-2.0 μm) and nanoplankton (2-20 μm) populations in water samples in the North Atlantic and in Lake Ontario and on macroaggregates in the North …
-
A size-based model of carbon and nitrogen flows in plankton communities
… the dynamics of carbon and nitrogen flows in plankton communities. All parameters in the model are determined by body size using empirically-determined relationships calculated from published data. The model is robust with respect to most parameters and assumptions. Because the model is based …
-
The distribution, abundance and ecology of mixotrophic algae in marine and freshwater plankton communities
… algae have been found to dominate the nanoplankton assemblage in some aquatic environments, and algal phagotrophy can account for a significant fraction of total bacterivory on occasion. The distribution and abundance of mixotrophic algae have not been widely characterized, however, and the …
-
Characterizing Plankton communities in Lake Ontario coastal wetlands along an urban land-use gradient
… effect of habitat condition and water quality on plankton communities across an urban land-use gradient in the Lake Ontario coastal wetlands: Frenchman’s Bay, Lynde Marsh, McLaughlin Bay, and Bowmanville Marsh over two years (2018-2019). One of the study wetlands (McLaughlin Bay) was assessed over …
-
The distribution, abundance and ecology of mixotrophic algae in marine and freshwater plankton communities
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1994.
-
Assessing the influence of geological and land-use gradients on zooplankton and phytoplankton biodiversity in the land between ecotone
… this study was to investigate water quality and plankton community patterns in lakes across TLB as a function of geological and spatial drivers. Lake water quality profiles were differentiated based on calcium concentrations, and increased watershed land-use was related to increased lake nutrient …
-
Using Hplc and Pcr-Dgge for the Assessment of Phytoplankton and Bacterioplankton Communities in Scottish Freshwater Lakes
… (Directive, 2000) prescribes the use of phytoplankton as a biological quality element for the determination of ecological status in surface waters. This study aimed to evaluate high performance liquid chromatography (HPLC) and a combination of polymerase chain reaction and denaturing gradient …
-
Diversity of larval tuna diets across the central equatorial Pacific
… consumed a taxonomically diverse range of zooplankton, with Katsuwonus exhibiting opportunistic foraging characterized by one or two dominant prey taxa that shifted across years, while Thunnus, despite limited sampling– consumed a broader range of prey taxa within a given year. Prey …
-
The Influence of Metacommunity Connectivity and Invasive Species on Diversity and Ecosystem Properties: Invasion, Predation by Native Species, and Genetic Diversity of Propagules
… success in both real and experimental metacommunities using freshwater plankton as a study system. The observational portion of this work (Chapter 2) examined zooplankton and phytoplankton community and ecosystem responses to zebra mussel invasion in 18 reservoirs spanning two natural …
-
Understanding and predicting responses of ecological communities to perturbations
Ecological communities—systems formed by several interacting species—are subject to external perturbations due to changing environmental conditions. Perturbations ranging from antibiotics in microbial communities to warming in coral reefs may displace species abundances or alter community …
-
Alkyl Polyglucoside Compound Influences Freshwater Plankton Community Structure in Floating Mesocosms
… primary producers (such as microalgae) and zooplankton. Zooplankton are also affected by APG, and species may demonstrate different sensitivities to APGs direct toxicity. Species not affected by direct toxicity may be affected by trophic interaction such as removal of a food source or changes …
-
Seasonal predictability and interannual variability in coastal planktonic communities
… the predictability and variability of coastal planktonic communities is essential for forecasting ecosystem responses to environmental change and managing marine resources. This thesis examines seasonal predictability, temperature-phenology relationships, and interannual bloom variability in …
-
Early life-history ecology of Arctic benthic invertebrates
… juvenile stages, which fundamentally alter adult communities. Yet, marine early life-history ecology is severely understudied, leaving us ill-prepared to predict impacts of a changing environment. The Arctic is warming rapidly, making it a natural laboratory for studying change. In addition, the …