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Rainbow trout personality: individual behavioural variation in juvenile Oncorhynchus mykiss

in Behaviour
Autor:innen:
Ashley Elias Department of Biological Sciences, Purdue University, 915 W State Street, West Lafayette, IN 47907, USA
Department of Biological Sciences, North Carolina State University, 112 Derieux Place, Raleigh, NC 27695, USA

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Frank Thrower Ted Stevens Marine Research Institute, Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Juneau, AK 99801, USA

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Krista M. Nichols Department of Biological Sciences, Purdue University, 915 W State Street, West Lafayette, IN 47907, USA
Conservation Biology Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA 98112, USA

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Abstract

We evaluated the variation in dispersal, exploration, and aggression across time in juvenile progeny produced from wild caught rainbow trout (Oncorhynchus mykiss) at a critical developmental shift associated with the highest mortality in fish. By testing multiple ecologically relevant behaviours repeatedly in the same individuals, we simultaneously tested multiple hypotheses regarding personality, plasticity, and behavioural syndromes to better understand the innate behavioural variation in a population containing both migratory and resident life histories. There were consistent behavioural differences, or personality, between individuals across time, for dispersal, aggression, and exploration, unrelated to size or sex. The significant repeatabilities (0.10–0.46) indicate that these traits are potentially heritable. Also, we found both habituation in all behaviours and significant differences between individuals in the rate of that habituation, despite no evidence of a behavioural syndrome. The identification of this individual level variation is a step towards understanding which heritable traits selection could influence.

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