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Phenotypic and social effects on behavioural trade-offs in Eurasian perch

Hellström, Gustav (2012). Phenotypic and social effects on behavioural trade-offs in Eurasian perch. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2012:69
ISBN 978-91-576-7716-7
[Doctoral thesis]

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Trading between conflicting demands is a fundamental part in how animals interact with its environment and social surrounding. Knowledge of what factors that are affecting behavioural decisions is central in our understanding of animal adaptation and ecology. This thesis summarizes a series of behavioural experiments investigating how animals compromise behaviours depending on environmental background and context. The focus is on within- and between-population variation in risk-taking and social trade-offs in young of the year and one year old Eurasian perch. Perch behaviour was quantified by observational studies in aquaria, using standardized assays that captured perch boldness and sociability. Perch from different predation backgrounds were compared in common garden experiments, as well as in multi-year inter-population comparisons, to study influence of predation experience on risk-taking phenotype. Results demonstrate predation as an important factor underlying how perch balance risk. Variation in risk-taking phenotype could to a large extent be explained by individual differences in experience of predation, rather than by fixed inherited responses caused by divergent selection. Experience of predation had long lasting effects on perch boldness, but perch were also able to quickly adjust phenotype in response to current conditions, indicating temporal flexibility in how experience shape behaviour. Social context influenced behaviour, with fish being bolder in larger group, and showing higher behavioural conformity. Occurrence of consistent individual variation in risk-taking and social behaviour could be established, confirming the existence of a personality dimension in perch behaviour. The thesis concludes that variation in how perch trade-off conflicting behaviours exists at multiple levels, from population to individual. Behavioural plasticity, even in strongly fitness related traits, is evident, although potential behavioural constraints in the form of consistent individuality is also present.

Authors/Creators:Hellström, Gustav
Title:Phenotypic and social effects on behavioural trade-offs in Eurasian perch
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :20 September 2012
Number of Pages:44
IHellström, G., Magnhagen, C. 2011. The influence of experience on risk taking. Results from a common-garden experiment on populations of Eurasian perch. Behavioral Ecology and Sociobiology, 10:1917-1926
IIMagnhagen, C., Hellström, G., Borcherding, J., Heynen, M. Boldness in two perch populations – long-term differences and the effect of predation pressure. Journal of Animal Ecology, in press
IIIHellström, G., Magnhagen, C. 2011. Balancing past and present – how experience influence boldness over time in Eurasian perch. Submitted manuscript
IVHellström, G., Heynen, M. Oosten J. E., Borcherding, J., Magnhagen, C. 2011. The effect of group size on risk taking and social conformity in Eurasian perch. Ecology of Freshwater Fish, 20: 499–502
VHellström, G., Heynen, M., Borcherding, J., Magnhagen, C. Influence of context and personality on group-size preference in Eurasian perch. Submitted manuscript
Place of Publication:Umeå
Publisher:Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-7716-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Behavioural Sciences Biology
Agrovoc terms:perca fluviatilis, animal behaviour, adaptation, predation
Keywords:boldness, adaptation, predation, sociability, risk, experience, perca fluviatilis
Permanent URL:
ID Code:9080
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
External funders:FORMAS
Deposited By: Gustav Helstrom
Deposited On:20 Sep 2012 14:31
Metadata Last Modified:02 Dec 2014 10:51

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