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Behavioral type, in interaction with body size, affects the recapture rate of brown trout Salmo trutta juveniles in their nursery stream

Artikel i vetenskaplig tidskrift
Författare Joacim Näslund
Niklas Wengström
Fredrik Wahlqvist
David Aldvén
Libor Zavorka
Johan Höjesjö
Publicerad i Integrative Zoology
Volym 13
Nummer/häfte 5
Sidor 604-611
ISSN 1749-4877
Publiceringsår 2018
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 604-611
Språk en
Länkar dx.doi.org/10.1111/1749-4877.12323
Ämnesord animal personality, freshwater fish, recapture rate, Salmonidae
Ämneskategorier Zoologi

Sammanfattning

Movement activity levels of wild animals often differ consistently among individuals, reflecting different behavioral types. Previous studies have shown that laboratory‐scored activity can predict several ecologically relevant characteristics. In an experiment on wild brown trout Salmo trutta, spanning from June to October, we investigated how spring swimming activity, measured in a standardized laboratory test, related to relative recapture probability in autumn. Based on laboratory activity scores, individuals clustered into 2 groups, which showed contrasting patterns in the size‐dependency of their recapture probability. Size had a slightly positive effect on recapture probability for passive fish but a clear negative effect on active fish. Our results show that the population structure in a cohort, in terms of relative proportions of behavioral types in different size classes, can vary over time. The results of this study could depend on either selective mortality or migration. However, selective disappearance of individuals with specific phenotypes, regardless of the mechanism, will have implications for trout population management, such as stocking efficiency of hatchery fish with high growth rates or maintenance of fishways past migration barriers.

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