Search for dissertations about: "Marine Ecology"
Showing result 21 - 25 of 342 swedish dissertations containing the words Marine Ecology.
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21. Non-indigenous zooplankton : the role of predatory cladocerans and of copepods in trophic dynamics
Abstract : Human-mediated introductions of non-indigenous species now threaten to homogenize the biota of the Globe, causing huge economic and ecological damage. This thesis studies the ecological role of 3 invasive planktonic crustaceans, the omnivorous copepod Acartia tonsa (western Atlantic and Indo-Pacific) and the predatory cladocerans, Cercopagis pengoi (Ponto-Caspian) and Bythotrephes longimanus (Eurasian). READ MORE
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22. Direct and indirect effects of fish predation and excretion in aquatic food webs
Abstract : The aim of this thesis was to elucidate the mechanisms by which planktivorous fish can affect planktonic communities in lakes and how they may affect benthic communities through their effects on planktonic communities. In a laboratory experiment, nutrients released by fish increased algal biomass and altered phytoplankton community structure, suggesting that fish can affect phytoplankton by directly releasing nutrients. READ MORE
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23. Limitations and possibilities for microbial degradation of organic contaminants in aquifers
Abstract : Many factors can influence the rate of microbial degradation of organic contaminants in aquifers. Some of these factors, e.g. READ MORE
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24. Effects of habitat structure on tropical fish assemblages
Abstract : Rates of habitat alteration and degradation are increasing worldwide due to anthropogenic influence. On coral reefs, the loss of live coral reduces structural complexity while facilitating algal increase. In many coastal lagoons seagrass and corals are cleared to make room for cultivated macroalgae. READ MORE
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25. Distribution patterns of macroinvertebrates in vegetated shallow soft-bottom bays of the Baltic Sea
Abstract : .... READ MORE