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Olsson, Ivan
Publications (8 of 8) Show all publications
Calles, O., Schmitz, M., Greenberg, L., Olsson, I., Comoglio, C., Kemp, P. & Blunden, L. (2010). Size-dependent mortality of migratory silver eels at a hydropower plant, and implications for escapement to the sea. Freshwater Biology, 55(10), 2167-2180
Open this publication in new window or tab >>Size-dependent mortality of migratory silver eels at a hydropower plant, and implications for escapement to the sea
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2010 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 55, no 10, p. 2167-2180Article in journal (Refereed)
Place, publisher, year, edition, pages
Wiley-Blackwell, 2010
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-9854 (URN)
Projects
Ålprojekt Ätran
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2019-07-12Bibliographically approved
Olsson, I., Greenberg, L., Bergman, E. & Wysujack, K. (2006). Environmentally induced migration: the importance of food. Ecology Letters 2006 9:645-651
Open this publication in new window or tab >>Environmentally induced migration: the importance of food
2006 (English)In: Ecology Letters 2006 9:645-651Article in journal (Refereed)
Place, publisher, year, edition, pages
Blackwell, 2006
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-18926 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-11-12
Olsson, I. & Greenberg, L. (2004). Partial migration in a landlocked brown trout population. Journal of Fish Biology 65: 106-121
Open this publication in new window or tab >>Partial migration in a landlocked brown trout population
2004 (English)In: 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.

National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-22248 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-11-12
Olsson, I. (2003). Influence on Habitat on Migration in Brown Trout, Salmo trutta L: Fil. Lic. thesis. Karlstad: Karlstad University Studies
Open this publication in new window or tab >>Influence on Habitat on Migration in Brown Trout, Salmo trutta L: Fil. Lic. thesis
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:nbn:se:kau:diva-20346 (URN)91-85019-34-8 (ISBN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Olsson, I., Greenberg, L. & Eklöv, A. (2001). Effect of an artificial pond on migrating brown trout smolts. North American Journal of Fisheries Management 21:498-506
Open this publication in new window or tab >>Effect of an artificial pond on migrating brown trout smolts
2001 (English)In: North American Journal of Fisheries Management 21:498-506Article in journal (Refereed)
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-18560 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-11-12
Olsson, I. & Arvidsson, B. (2001). Utvandring av klarälvslax från en utsättningsbassäng med förbindelse till Klarälven: Migration of the Klarälven salmon from a stocking pond into Klarälven. Karlstad: Karlstad University Studies
Open this publication in new window or tab >>Utvandring av klarälvslax från en utsättningsbassäng med förbindelse till Klarälven: Migration of the Klarälven salmon from a stocking pond into Klarälven
2001 (Swedish)Report (Refereed)
Place, publisher, year, edition, pages
Karlstad: Karlstad University Studies, 2001
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-25325 (URN)
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2015-01-29
Olsson, I. (1999). Effect of pond habitats on migrating brown trout (Salmo trutta L.) smolt. Information from the National Board of Fisheries. 1999:5: 33-50. Report written in Swedish with English abstract
Open this publication in new window or tab >>Effect of pond habitats on migrating brown trout (Salmo trutta L.) smolt
1999 (English)In: Information from the National Board of Fisheries. 1999:5: 33-50. Report written in Swedish with English abstractArticle in journal (Refereed)
Identifiers
urn:nbn:se:kau:diva-18578 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Olsson, I. & Greenberg, L. (1997). Effect of pond habitats on migrating brown trout smolt, 1996: Masters project. Lund University. Report written in Swedish with English abstract.
Open this publication in new window or tab >>Effect of pond habitats on migrating brown trout smolt, 1996: Masters project. Lund University. Report written in Swedish with English abstract
1997 (English)Report (Refereed)
National Category
Biological Sciences
Research subject
Biology
Identifiers
urn:nbn:se:kau:diva-18579 (URN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2015-11-12
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