Search for dissertations about: "aquatic communities"

Showing result 1 - 5 of 80 swedish dissertations containing the words aquatic communities.

  1. 1. Assembly Mechanisms in Aquatic Bacterial Communities The Role of Disturbances, Dispersal and History

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Mercè Berga Quintana; Silke Langenheder; Eva Lindström; Örjan Östman; Mathew Leibold; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; diversity; community composition; metacommunity;

    Abstract : Environmental conditions, biotic interactions, dispersal and history have been suggested to be important processes influencing the spatial distribution of organisms and thus to affect community assembly. Understanding how these processes influence community assembly is important, particularly because community diversity and composition are suggested to be relevant for ecosystem functioning. READ MORE

  2. 2. Psychotropic Pharmaceuticals in Aquatic Systems: An Ecological Perspective

    University dissertation from Department of Biology, Lund University

    Author : Melanie Hedgespeth; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; ecotoxicology; aquatic; trophic level; pharmaceutical; SSRI; beta-blocker; sertraline; fluoxetine; propranolol; fish; daphnia; snail; predator; prey; behavior; life history; multiple stressor;

    Abstract : Psychotropic pharmaceuticals have been shown to exert a variety of sublethal effects on non-target organisms, even at low concentrations found in the environment (ng/L to µg/L); hence, the aim of my research has been to determine the individual-level effects of psychotropic pharmaceuticals (the selective serotonin reuptake inhibitors sertraline and fluoxetine, and the β-blocker propranolol) on behavioral and life history traits in freshwater organisms. Further, this research was directed towards assessing the potential large-scale impacts of these effects on population growth and predator-prey interactions (with community-level implications) via the application of traditional, ecological concepts and models. READ MORE

  3. 3. Indirect effects of river regulation consequences for landbirds of reduced numbers of aquatic insects

    University dissertation from Umeå : Ekologi, miljö och geovetenskap

    Author : Darius Strasevicius; Björn Malmqvist; Tapio Eeva; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Boreal region; Simuliidae; Leucocytozoon; pied flycatcher; aquatic insects; breeding success; blood parasites; bird communities; river regulation; impoundment; NATURAL SCIENCES Biology; NATURVETENSKAP Biologi;

    Abstract : Abstrakt: Jag har undersökt hur älvreglering påverkar mängden knott (Tvåvingar: Simuliidae) längs flera norrlandsälvar och vilka konsekvenser denna påverkan får för den landlevande fågelfaunan. Studien visar att utbyggnad av älvar har en negativ effekt på mängden knott. READ MORE

  4. 4. Uptake and toxicity of brominated flame retardants and pesticides : Studies on littoral organisms and model communities

    University dissertation from Stockholm : Institutionen för systemekologi

    Author : Kerstin Gustafsson; Nils Kautsky; Kirsten Christoffersen; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; aquatic ecotoxicology; ecological interactions; indirect effects; model community studies; toxicity; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi;

    Abstract : In this thesis, brackish and freshwater littoral model communities (microcosms) of varying size and complexity were used to study the effects of brominated flame retardants (BFRs) and pesticides. The brackish water microcosms consisted of natural water, sediment and associated organisms, while the larger freshwater microcosms also contained submersed macrophytes (Elodea canadensis). READ MORE

  5. 5. Ecotoxicological assessment by microcosm tests on plankton communities

    University dissertation from Department of Ecology, Lund University

    Author : Pardis Pirzadeh; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; limnologi; Marinbiologi; aquatic ecology; limnology; Ecology; Ekologi; Hydrobiology; marine biology; musk substances; brominated flame retardants; structural effects; akvatisk ekologi; Environmental chemistry; Miljökemi; mesocosm;

    Abstract : The aim of this thesis is to present a short-term plankton community toxicity test in laboratory microcosms, with which the effect of the test substance on species abundance and composition of the community is evaluated. This laboratory microcosm is an intermediate between single-species tests and outdoor mesocosm tests. READ MORE