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Boldness and aggressiveness in early and late hatched three-spined sticklebacks Gasterosteus aculeatus

Authors

  • M. L. Ruiz-Gomez,

    Corresponding author
    1. Fish Biology Group, Institute of Biomedical and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, U.K.
      Author to whom correspondence should be addressed at present address: Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario # 100 Centro, Toluca, Estado de México, C. P. 50000 México. Tel.: +52 1722 160 90 79; email: ruiz.gomez.maria@gmail.com
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  • F. A. Huntingford

    1. Fish Biology Group, Institute of Biomedical and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, U.K.
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Author to whom correspondence should be addressed at present address: Facultad de Ciencias, Universidad Autónoma del Estado de México, Instituto Literario # 100 Centro, Toluca, Estado de México, C. P. 50000 México. Tel.: +52 1722 160 90 79; email: ruiz.gomez.maria@gmail.com

Abstract

Levels of boldness and the degree of aggressiveness were compared in juvenile three-spined sticklebacks Gasterosteus aculeatus that had hatched early and late in the breeding season. The most striking result found in this study was that early hatched individuals were bolder when exploring a novel environment than were late-hatched individuals. No differences in levels of aggression between early and late hatchlings were found, but a relationship between boldness and aggressiveness was present regardless of hatching date. The implications of these findings are discussed in the light of research on individual variation in behaviour and the development of behavioural syndromes.

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