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  • 1.
    Calles, Olle
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Schmitz, Monika
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Olsson, Ivan
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Comoglio, C
    Kemp, P.S
    Blunden, L
    Size-dependent mortality of migratory silver eels at a hydropower plant, and implications for escapement to the sea2010In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 55, no 10, p. 2167-2180Article in journal (Refereed)
  • 2.
    Olsson, Ivan
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Effect of pond habitats on migrating brown trout (Salmo trutta L.) smolt1999In: Information from the National Board of Fisheries. 1999:5: 33-50. Report written in Swedish with English abstractArticle in journal (Refereed)
  • 3.
    Olsson, Ivan
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Influence on Habitat on Migration in Brown Trout, Salmo trutta L: Fil. Lic. thesis2003Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The two papers presented in this thesis focus on different aspects of migration in brown trout.

    In paper I, I measured loss-rates and studied migratory behavior of brown trout as they swam through a newly created artificial lentic habitat, and compared these results with a reference section in the stream. I found higher loss-rates, an altered diel activity pattern and a slower swimming speed in the lentic habitat than in the stream section. Lentic habitats might therefore act as a barrier, contributing to higher costs for migrants. In paper II, I monitored a landlocked brown trout population in two lotic stream sections, geographically separated by a lentic habitat. In the upstream section, where density was low and growth rate high, most individuals did not migrate, whereas in the downstream section, where density was high and growth rate low, many individuals migrated. Thus, the decision to migrate depended on origin of the trout and seemed to be related to juvenile density and growth. In addition, the lentic habitat might have functioned as a barrier, selecting for residency in the upstream section.

  • 4.
    Olsson, Ivan
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Arvidsson, Björn
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Utvandring av klarälvslax från en utsättningsbassäng med förbindelse till Klarälven: Migration of the Klarälven salmon from a stocking pond into Klarälven2001Report (Refereed)
  • 5.
    Olsson, Ivan
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Effect of pond habitats on migrating brown trout smolt, 1996: Masters project. Lund University. Report written in Swedish with English abstract1997Report (Refereed)
  • 6.
    Olsson, Ivan
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Partial migration in a landlocked brown trout population2004In: Journal of Fish Biology 65: 106-121Article in journal (Refereed)
    Abstract [en]

    Population densities of landlocked lakemigratory brown trout Salmo trutta were estimated in two distinct lotic sections, separated by a lentic segment, in the Greåna River, Sweden, and individual growth and habitat use were monitored for 835 tagged brown trout from September 1998 to June 2000. Residency dominated in the upstream section where density of 0+ and 1+ year brown trout was low and growth rate high. In contrast, >90% of the brown trout that migrated to the lake originated from the downstream section, where density was high and growth rate low. For 2+ year individuals, growth rate was similar between the two stream sections, but densities were higher in the upstream than in the downstream section. Lakemigrants had higher growth rates than nonmigrants (residents) during the autumn of both years. From September to May, migrants increased their body mass by >35%, whereas nonmigrants increased by <5%. Approximately 70% of the brown trout moved <10 m and <2% moved between the two stream sections, indicating that the lentic habitat might function as a barrier for juveniles. Differences in migratory behaviour, density and growth between the upstream and the downstream section might indicate that environmental factors influence the decision to migrate. It cannot be excluded, however, that the observed differences are genetically programmed, selected by migration costs that favour migratory behaviour downstream and residency upstream.

  • 7.
    Olsson, Ivan
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Bergman, Eva
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Wysujack, Klaus
    Environmentally induced migration: the importance of food2006In: Ecology Letters 2006 9:645-651Article in journal (Refereed)
  • 8.
    Olsson, Ivan
    et al.
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Greenberg, Larry
    Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
    Eklöv, A.
    Effect of an artificial pond on migrating brown trout smolts2001In: North American Journal of Fisheries Management 21:498-506Article in journal (Refereed)
1 - 8 of 8
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