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Influence on Habitat on Migration in Brown Trout, Salmo trutta L: Fil. Lic. thesis
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
2003 (English)Other (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.

Place, publisher, year, pages
Karlstad: Karlstad University Studies , 2003.
Identifiers
URN: urn:nbn:se:kau:diva-20346ISBN: 91-85019-34-8 (print)OAI: oai:DiVA.org:kau-20346DiVA: diva2:594006
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21

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