Search for dissertations about: "population ecology"

Showing result 1 - 5 of 419 swedish dissertations containing the words population ecology.

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

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Johan Hammar; [1998]
    Keywords : 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;

    Abstract : 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). READ MORE

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

    University dissertation from Växjö : Linnaeus University Press

    Author : Daniel Bengtsson; Jonas Waldenström; W. Michael Eichholtz; [2016]
    Keywords : 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;

    Abstract : 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. READ MORE

  3. 3. Population dynamics of tundra-living grey-sided voles

    University dissertation from Växjö : Linnaeus University Press

    Author : Per Ekerholm; Lauri Oksanen; Rolf Anker Ims; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ecology; Population dynamics; Tundra; Grey-sided vole; Cycles; Vole specialist predators; Ekologi; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi; zooekologi; Animal Ecology;

    Abstract : This thesis deals with the dynamics of tundra living voles with emphasis on the most common one, the grey-sided vole (Clethrionomys rufocanus). The tundra area chosen for the study was Finnmarksvidda, a vast flatland in northernmost Norway. READ MORE

  4. 4. Population ecology and management of waders breeding on coastal meadows

    University dissertation from Richard Ottvall, Department of Ecology, Animal Ecology, Ecology Building, SE-223 62 Lund

    Author : Richard Ottvall; [2004]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Animal ecology; Djurekologi; grazing management; population modelling; demography; genetic structure; population decline; Tringa totanus;

    Abstract : Many wader (Charadrii) populations are declining throughout in Europe, but the underlying causes are often poorly known and diverse. To fully grasp the reasons behind declines in vulnerable wader populations, it is crucial to understand the demography. READ MORE

  5. 5. Species interactions govern evolutionary and ecological effects of population harvesting

    University dissertation from Department of Theoretical Ecology, Ecology Building, SE-223 62 Lund, Sweden

    Author : Anna Gårdmark; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; population harvesting; species interactions; ecological community; Ekologi; Ecology; competition; predation; fisheries; spatial dynamics; maturation; population dynamics; life-history evolution; adaptation;

    Abstract : Harvesting changes population abundance and can affect adaptation of several life-history traits. Harvesting can also have indirect effects ? effects on non-target species and secondary effects on target species ? because interactions between species in a community determine the relevant ecological and evolutionary feedback environment. READ MORE