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Winter Behavior of Brown Trout: The Presence of Ice Cover Influences Activity, Stress and Growth
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. (Naturresurs rinnande vatten)ORCID iD: 0000-0002-4417-6636
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. (Naturresurs rinnande vatten)ORCID iD: 0000-0003-2220-1615
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences. (Naturresurs rinnande vatten)ORCID iD: 0000-0002-2633-4178
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.ORCID iD: 0000-0002-3191-7140
2015 (English)Conference paper, Abstract (Refereed)
Abstract [en]

Predation on fish by mammals and birds may be high during winter in boreal streams, and juvenile salmonids respond by reducing their daytime activity to minimize exposure. Surface ice may offer protection from terrestrial predators, and salmonids under ice cover should spend less time on anti-predator behaviors and increase their activity. Using brown trout as a test species, these predictions were tested in laboratory and field experiments.

In an artificial laboratory stream, the presence of ice cover reduced stress and increased swimming activity, foraging and aggression. The effect of ice cover on activity was greatest for trout with high resting metabolic rates, suggesting that individual intraspecific differences in metabolism may influence the strategies used to cope with different winter conditions. In a boreal forest stream, we simulated ice by suspending plastic sheeting over five 30-m-long stretches, and trout that spent winter under this simulated ice cover grew better than trout in control stretches. These results may explain why salmonid production is high in rivers with long periods of stable ice cover and should be viewed in light of ongoing global warming.

Place, publisher, year, edition, pages
American Fishery Society , 2015.
National Category
Behavioral Sciences Biology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-38056OAI: oai:DiVA.org:kau-38056DiVA: diva2:857079
Conference
145th Annual Meeting of the American Fisheries Society. Portland August 16-20, 2015.
Available from: 2015-09-28 Created: 2015-09-28 Last updated: 2016-12-07Bibliographically approved

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Watz, JohanBergman, EvaPiccolo, John J.Greenberg, Larry
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