, Volume 99, Issue 1, pp 11–21 | Cite as

The role of body size versus growth on the decision to migrate: a case study with Salmo trutta

  • M. L. AcolasEmail author
  • J. Labonne
  • J. L. Baglinière
  • J. M. Roussel
Original Paper


In a population exhibiting partial migration (i.e. migration and residency tactics occur in the same population), the mechanisms underlying the tactical choice are still unclear. Empirical studies have highlighted a variety of factors that could influence the coexistence of resident and migratory individuals, with growth and body size considered to be key factors in the decision to migrate. Most studies suffer from at least one of the two following caveats: (1) survival and capture probabilities are not taken into account in the data analysis, and (2) body size is often used as a proxy for individual growth. We performed a capture–mark–recapture experiment to study partial migration among juvenile brown trout Salmo trutta at the end of their first year, when a portion of the population emigrate from the natal stream while others choose residency tactic. Bayesian multistate capture–recapture models accounting for survival and recaptures probabilities were used to investigate the relative role of body size and individual growth on survival and migration probabilities. Our results show that, despite an apparent effect of both size and growth on migration, growth is the better integrative parameter and acts directly on migration probability whereas body size acts more strongly on survival. Consequently, we recommend caution if size is used as a proxy for growth when studying the factors that drive partial migration in juvenile salmonid species.


Bayesian model Capture–mark–recapture Migration Passive integrated transponders (PIT) 



This study was carried out with the financial support of Le Conseil Régional de Basse-Normandie and the French National Institute for Agronomic Research (INRA) to ML Acolas (doctoral fellowship). Dominique Huteau has developed the portable PIT detectors used in this project. He is gratefully acknowledged, as well as Frédéric Marchand and Julien Tremblay for their broad participation to field work and especially tracking surveys. We wish to thank Richard Delanoé and the Office National de l’Eau et des Milieux Aquatiques (ONEMA) in Basse-Normandie for electrofishing surveys. We thank Martin Schlaepfer and Rick Cunjak for relevant comments on earlier draft and edition of the English style.

This experiment complies with the current laws of the country in which they were performed.

Supplementary material

114_2011_861_MOESM1_ESM.doc (81 kb)
ESM 1 (DOC 81 kb)


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • M. L. Acolas
    • 1
    Email author
  • J. Labonne
    • 2
  • J. L. Baglinière
    • 1
  • J. M. Roussel
    • 1
  1. 1.INRA, UMR INRA-Agrocampus-Ouest Ecologie et Santé des EcosystèmesRennesFrance
  2. 2.INRA, UMR ECOBIOPSt-Pée Sur NivelleFrance

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