Sökning: "Ecology"

Visar resultat 1 - 5 av 1332 avhandlingar innehållade ordet Ecology.

  1. 1. Stopover Ecology of Mallards Where, when and how to do what?

    Detta är en avhandling från Växjö : Linnaeus University Press

    Författare :Daniel Bengtsson; Linnéuniversitetet.; [2016]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Age characters; body condition; departure decision; effects of influenza A virus; habitat selection; mallard; movement; Ottenby Bird Observatory; stopover ecology; weather; wild birds; Ecology; Ekologi;

    Sammanfattning : The mallard (Anas platyrhynchos) is the most numerous and widespread duck in the northern hemisphere and a model species in ecology and harvest management. Migration is a crucial life stage for many birds and understanding the drivers of migration has important implications for conservation biology and assessment of animal population responses to global changes. LÄS MER

  2. 2. Evolutionary ecology of arctic char (Salvelinus alpinus (L.)) : Intra- and interspecific interactions in circumpolar populations

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Johan Hammar; Uppsala universitet.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Arctic char; Salvelinus alpinus; biogeography; niche; life history; population ecology; intra- and interspecific interactions; cannibalism; competition; landlocked; marginal populations; species border; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

    Sammanfattning : This thesis examines a suite of ecological and genetic mechanisms influencing the fundamental and realized niche borders of European and North American populations of the Arctic char (Salvelinus alpinus (L.)) species complex in allopatry as well as in sympatry with brown trout (Salmo trutta) or brook trout (Salvelinus fontinalis). LÄS MER

  3. 3. Evolutionary ecology of the snails LITTORINA LITTOREA and L. SAXATILIS: mating behaviour and habitat choice

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Johan Erlandsson; Göteborgs universitet.; University of Gothenburg.; Göteborgs universitet.; University of Gothenburg.; Göteborgs universitet.; Göteborgs universitet.; Gothenburg University.; Gothenburg University.; [1998]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Terrestisk; limnisk och marin ekologi; Terrestrial; freshwater and marine ecology;

    Sammanfattning : .... LÄS MER

  4. 4. Inducible chemical responses and herbivore resistance in seaweeds

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Gunilla B. Toth; Göteborgs universitet.; University of Gothenburg.; Göteborgs universitet.; University of Gothenburg.; Göteborgs universitet.; Göteborgs universitet.; Gothenburg University.; Gothenburg University.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Marin ekologi; Marine ecology;

    Sammanfattning : .... LÄS MER

  5. 5. Predator-prey interactions in freshwater systems: The importance of chemical communication

    Detta är en avhandling från Kajsa Åbjörnsson, Limnology, Ecology Building, S-223 62 Lund, Sweden

    Författare :Kajsa Åbjörnsson; Lunds universitet.; Lund University.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; aquatic ecology; marine biology; limnology; Marinbiologi; limnologi; akvatisk ekologi; Ecology; Ekologi; Hydrobiology; trophic cascades; non-lethal effects; benefits; costs; heredity; predator experience; alarmsubstances; dietary cues; amphibian larvae; invertebrates; visibility; fish; behaviour; Predator-prey; chemical cues;

    Sammanfattning : Predator released chemical cues provide a valuable source of information to prey organisms that can be used to alter their behaviour in order to reduce predation risk. In this thesis, I have examined under what circumstances chemical cues may be used by prey, and if prey discriminate between different cues. LÄS MER