Abstract
Evolution of the mate recognition system (MRS) can play a central role in animal speciation. One dramatic consequence of changes in the MRS is the failure of individuals from divergent lineages to successfully court and mate, thereby reducing gene flow between these groups. Here, we test the role of an acoustic mating signal on mate choice in a Hawaiian cricket genus (Gryllidae: Laupala). Speciation in Laupala is proceeding at an extremely rapid rate, apparently driven by divergence in aspects of the mate recognition system, most conspicuously the pulse rate of male calling song. Previous studies demonstrate that females prefer the pulse rate of a conspecific male’s song when perceived at long range, in laboratory phonotaxis trials. In this study, we examined mate choice in two species that differ dramatically in pulse rate: Laupala paranigra and Laupala kohalensis. We tested the female’s preference in both species for pulse rates at close range, by providing females an opportunity to mate with hybrid males producing a range of intermediate pulse rates. Results of our study demonstrate that while strong behavioral barriers exist between these two species, variation in the pulse rate of male calling song did not predict female mate choice at close range. These results suggest a more complex architecture to mate recognition in Laupala than previously hypothesized.
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Acknowledgements
We thank T. deCarvalho for assisting in behavioral observations, and two anonymous reviewers for helpful comments on the manuscript. The research was funded in part by NSF training grant DBI-9602266 to T.C.M. and NSF grant DEB-9729325 to K.L.S.
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Communicated by D.T. Gwynne
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Mendelson, T.C., Shaw, K.L. Close-range acoustic signaling and mate choice in Hawaiian crickets (Gryllidae: Laupala). Behav Ecol Sociobiol 59, 770–776 (2006). https://doi.org/10.1007/s00265-005-0107-7
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DOI: https://doi.org/10.1007/s00265-005-0107-7