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Open Access Research

Genetic analysis of male reproductive success in relation to density in the zebrafish, Danio rerio

Rowena Spence1*, William C Jordan2 and Carl Smith1

Author Affiliations

1 Department of Biology, University of Leicester, University Road, Leicester, UK

2 Institute of Zoology, Zoological Society of London, Regent's Park, London, UK

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Frontiers in Zoology 2006, 3:5  doi:10.1186/1742-9994-3-5

Published: 5 April 2006

Abstract

Background

We used behavioural and genetic data to investigate the effects of density on male reproductive success in the zebrafish, Danio rerio. Based on previous measurements of aggression and courtship behaviour by territorial males, we predicted that they would sire more offspring than non-territorial males.

Results

Microsatellite analysis of paternity showed that at low densities territorial males had higher reproductive success than non-territorial males. However, at high density territorial males were no more successful than non-territorials and the sex difference in the opportunity for sexual selection, based on the parameter Imates, was low.

Conclusion

Male zebrafish exhibit two distinct mating tactics; territoriality and active pursuit of females. Male reproductive success is density dependent and the opportunity for sexual selection appears to be weak in this species.