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Shape up or ship out: migratory behaviour predicts morphology across spatial scale in a freshwater fish.

Author:
  • Ben Chapman
  • Kaj Hulthén
  • Christer Brönmark
  • Anders Nilsson
  • Christian Skov
  • Lars-Anders Hansson
  • Jakob Brodersen
Publishing year: 2015
Language: English
Pages: 1187-1193
Publication/Series: Journal of Animal Ecology
Volume: 84
Issue: 5
Document type: Journal article
Publisher: Federation of European Neuroscience Societies and Blackwell Publishing Ltd

Abstract english

1.Migration is a widespread phenomenon, with powerful ecological and evolutionary consequences. Morphological adaptations to reduce the energetic costs associated with migratory transport are commonly documented for migratory species. However few studies have investigated whether variation in body morphology can be explained by variation in migratory strategy within a species. 2.We address this question in roach Rutilus rutilus, a partially migratory freshwater fish that migrates from lakes into streams during winter. We both compare body shape between populations that differ in migratory opportunity (open versus closed lakes), and between individuals from a single population that vary in migratory propensity (migrants and residents from a partially migratory population). Following hydrodynamic theory, we posit that migrants should have a more shallow body depth, to reduce the costs associated with migrating into streams with higher flow conditions than the lakes the residents occupy all year round. 3.We find evidence both across and within-populations to support our prediction, with individuals from open lakes and migrants from the partially migratory population having a more slender, shallow-bodied morphology than fish from closed lakes and all-year residents. 4.Our data suggest that a shallow body morphology is beneficial to migratory individuals and our study is one of the first to link migratory strategy and intraspecific variation in body shape. This article is protected by copyright. All rights reserved.

Keywords

  • Ecology

Other

Published
  • CAnMove
  • ISSN: 1365-2656
Kaj Hultén
E-mail: kaj.hulthen [at] biol.lu.se

Postdoctoral fellow

Aquatic ecology

+46 46 222 84 37

+46 76 786 49 97

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden