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ID: <

50|dedup_wf_001::11d83a89661fbc1e1e04e1ddb8cfebbf

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DOI: <

10.1002/ece3.1075

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Consistent size-independent harvest selection on fish body shape in two recreationally exploited marine species

Abstract

Harvesting wild animals may exert size-independent selection pressures on a range of morphological, life history, and behavioral traits. Most work so far has focused on selection pressures on life history traits and body size as morphological trait. We studied here how recreational fishing selects for morphological traits related to body shape, which may correlate with underlying swimming behavior. Using landmark-based geometric morphometrics, we found consistent recreational fishing-induced selection pressures on body shape in two recreationally exploited marine fish species. We show that individuals with larger-sized mouths and more streamlined and elongated bodies were more vulnerable to passively operated hook-and-line fishing independent of the individual's body size or condition. While the greater vulnerability of individuals with larger mouth gapes can be explained by the direct physical interaction with hooks, selection against streamlined and elongated individuals could either involve a specific foraging mode or relate to underlying elevated swimming behavior. Harvesting using passive gear is common around the globe, and thus, size-independent selection on body shape is expected to be widespread potentially leaving behind individuals with smaller oral gapes and more compact bodies. This might have repercussions for food webs by altering foraging and predation. © 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This study was financed by the research project REC2 (grant#CTM2011-23835) funded by the Spanish Ministry of Economy and Competiveness (MINECO) and a Marie Curie Post-Doc grant to JA (FP7-PEOPLE-2012-IEF, Grant Number 327160). RA received funding from the German Federal Ministry for Education and Research (BMBF) through the Program for Social-Ecological Research for the project Besatzfisch (Grant Number 01UU0907, www.besatz-fisch.de) and the University of Florida, School of Forest Resources and Conservation, during a sabbatical stay during which this manuscript was drafted. The finalization of the project was financially supported by the BTypes project funded through the Leibniz Competition (SAW-2013-IGB-2) to R.A.

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