Search for dissertations about: "habitat preference"

Showing result 1 - 5 of 28 swedish dissertations containing the words habitat preference.

  2. 1. The long-term decline of the grey-sided vole (Clethrionomys rufocanus) in boreal Sweden: importance of focal forest patch and matrix

    Author : Pernilla Christensen; Birger Hörnfeldt; Rolf A. Ims; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; : Destructive sampling; high quality habitat; focal habitat; landscape; habitat fragmentation; threshold; clear-cut; patch size and quality; long-term time-series; Terrestrial ecology; Terrestisk ekologi;

    Abstract : There has been a long-term decline in number of cyclic vole populations in boreal Sweden since the 1970s. Several hypotheses have been suggested to explain this decline. Commonly for C. glareolus, C. READ MORE

  4. 2. Age-class interactions in Atlantic salmon and brown trout: Effects on habitat use and performance

    Author : Rasmus Kaspersson; Göteborgs universitet; []
    Keywords : competition; inter-cohort; density-dependence; growth; habitat; Salmo trutta; Salmo salar; salmon; trout;

    Abstract : This thesis investigates the underlying mechanisms and the density-regulatory effects of age-class interactions, using juvenile Atlantic salmon (Salmo salar L.) and brown trout (Salmo trutta L.) as study species. READ MORE

  5. 3. The evolutionary ecology of niche separation : Studies on the sympatric butterflies Leptidea sinapis and Leptidea reali

    Author : Magne Friberg; Wiklund Christer; John N. Thompson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Lepidoptera; ecological character displacement; reproductive isolation; species discrimination; habitat; host plant; life history; sexual selection; female choice; Biology; Biologi; zoologisk ekologi; Animal Ecology;

    Abstract : Studies of ecology and evolution have become largely integrated, and increasing attention is paid to the role of ecology for speciation and post speciation divergence. In this thesis I have applied an in-depth approach studying the ecology of a butterfly species pair; the morphologically virtually identical sister-species, the Wood white (Leptidea sinapis) and Reál’s wood white (Leptidea reali). READ MORE

  6. 4. Distribution patterns of macroinvertebrates in vegetated shallow soft-bottom bays of the Baltic Sea

    Author : Joakim Hansen; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; macrophytes; biodiversity; species composition; ecological succession; lagoons; habitat selection; food preference; structural complexity; Freshwater ecology; Limnisk ekologi; Marine ecology; Marin ekologi;

    Abstract : .... READ MORE

  7. 5. Through the eyes of a woodpecker: Understanding habitat selection, territory quality and reproductive decisions from individual behaviour

    Author : Ola Olsson; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reproductive success; territory quality; habitat selection; giving-up density; Bayesian processes; foraging; Picidae; lesser spotted woodpecker; Dendrocopos minor; conservation; Animal ecology; Djurekologi;

    Abstract : In this thesis I present some connections between foraging behaviour and reproductive success, time budget, tree species use, and habitat selection. The thesis is based upon both theoretical and empirical work. All empirical studies concern a south Swedish population of lesser spotted woodpeckers Dendrocopos minor, studied between 1990 and 1996. READ MORE