The ontogeny of courtship, colour and sperm production in male guppies

Authors

  • J. P. Evans,

    Corresponding author
    1. Environmental and Evolutionary Biology, University of St Andrews, St Andrews, Fife, KY16 9TS, U.K.
      Author to whom correspondence should be addressed at present address: Dipartimento di Biologia, Università di Padova, via U. Bassi 58/B, I-35131, Padova, Italy. Tel.: +39 (0) 49 827 6224; fax: +39 (0) 49 827 6209; email: jpevans@civ.bio.unipd.it
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  • T. E. Pitcher,

    1. Department of Zoology, University of Toronto, 25 Harbord St, Toronto, Ontario M5S 3G5, Canada
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  • A. E. Magurran

    1. Environmental and Evolutionary Biology, University of St Andrews, St Andrews, Fife, KY16 9TS, U.K.
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Author to whom correspondence should be addressed at present address: Dipartimento di Biologia, Università di Padova, via U. Bassi 58/B, I-35131, Padova, Italy. Tel.: +39 (0) 49 827 6224; fax: +39 (0) 49 827 6209; email: jpevans@civ.bio.unipd.it

Abstract

The onset of sexual behaviour in three age classes of male guppy Poecilia reticulata occurred in synchrony with the appearance of body colouration and anal fin differentiation but not with sperm production. There was also a positive correlation between sperm production and sexual behaviour in the two older age classes.

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