Angling selects against active and stress-resilient phenotypes in rainbow trout

Koeck, B. , Závorka, L., Aldvén, D., Näslund, J., Arlinghaus, R., Thörnqvist, P.-O., Winberg, S., Björnsson, B. T. and Johnsson, J. I. (2019) Angling selects against active and stress-resilient phenotypes in rainbow trout. Canadian Journal of Fisheries and Aquatic Sciences, 76(2), pp. 320-333. (doi: 10.1139/cjfas-2018-0085)

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Abstract

Selection induced by human harvest can lead to different patterns of phenotypic change than natural predation and could be a major driving force of evolution of wild populations. The vulnerability of individuals to angling depends on the individual decision to ingest the bait, possibly mediated by their neuroendocrine response towards the associated stimulus. To investigate the mechanisms behind individual vulnerability to angling, we conducted angling experiments in replicated ponds and quantified individual behavioral traits and neuroendocrine stress responsiveness in two salmonid species, rainbow trout and brown trout. We discovered a phenotypic syndrome in rainbow trout, but not in brown trout, where lower serotonergic and dopaminergic brain activity and cortisol levels (i.e., lower stress responsiveness) in response to a standardized experimental stressor were associated with higher activity, forming a proactive phenotype that showed increased vulnerability to angling. Our results show that angling targets the most stress-resilient and active phenotypes of rainbow trout, supporting the suggestion that fishing-induced phenotypic selection may lead to an increased representation of stress-responsive and low-activity phenotypes in harvested populations.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Koeck, Dr Barbara
Authors: Koeck, B., Závorka, L., Aldvén, D., Näslund, J., Arlinghaus, R., Thörnqvist, P.-O., Winberg, S., Björnsson, B. T., and Johnsson, J. I.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Canadian Journal of Fisheries and Aquatic Sciences
Publisher:NRC Research Press
ISSN:0706-652X
ISSN (Online):1205-7533
Published Online:22 May 2018
Copyright Holders:Copyright © 2018 NRC Research Press
First Published:First published in Canadian Journal of Fisheries and Aquatic Sciences 76(2): 320-333
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher
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