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Marine Biology

, Volume 152, Issue 3, pp 619–630 | Cite as

Reproductive isolation in temperate reef fishes

  • Maren Wellenreuther
  • Kendall D. Clements
Research Article

Abstract

Opportunity and recognition isolation can lead directly to reproductive isolation, the former via divergence in the location and timing of breeding, and the latter via differential mate preferences. We describe the potential significance of these factors in the maintenance of reproductive isolation in a clade of triplefin fishes that occur sympatrically around coastal New Zealand. Specifically, we investigate the roles of spawning time and nesting habitat in promoting opportunity isolation, and of interspecific variation in male body length and breeding colouration in promoting recognition isolation. The triplefin species investigated are reproductively active over several months and show high overlap in breeding times, thus rejecting temporal isolation as a mechanism. Differences in nesting habitats resulted in a reduced probability of encounter between some species, especially between sister-species pairs. Interspecific colour differences generally decreased during the reproductive period, and males of sister-species pairs showed no interspecific colour differences in the ultraviolet light spectrum, thus mate selection based on male colour patterns is unlikely to lead to premating isolation. Finally, males of closely related triplefin species differed in body length, a secondary sexual trait often involved in assortative mating. Thus, spatial differences in nesting habitats reduce the chances of encountering allospecific mates, which may facilitate opportunity isolation and differences in male length, possibly related to species-specific female selection on male body size, may lead to recognition isolation. The combination of limited spatial overlap in nesting habitat and differences in male body size may facilitate species assortative mating in sympatry or parapatry.

Keywords

Nest Site Reproductive Isolation Assortative Mating Male Body Breeding Habitat 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We would like to thank B. Doak and M. Birch for skippering the R.V. Hawere, and Z. Hilton and D. Moran for help with fieldwork. C. Syms has considerably improved the statistics used in this paper. We thank B. Doak, I. Skipworth and R. Armstrong for photographs of triplefin species and J. Marshall and K. Fritsches for advice on how to measure ultraviolet colour patterns. We would also like to thank P. Munday and three anonymous reviewers for helpful comments on the manuscript. M. Wellenreuther was funded by a Top Achiever Doctoral Scholarship from the Tertiary Education Commission of the New Zealand government and a doctoral scholarship from the University of Auckland. This research was supported by a Marsden grant from the New Zealand Royal Society to K. D. Clements.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.School of Biological SciencesThe University of AucklandAucklandNew Zealand

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