Close-range acoustic signaling and mate choice in Hawaiian crickets (Gryllidae: Laupala) |
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Authors: | Tamra C Mendelson Kerry L Shaw |
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Institution: | (1) Department of Biological Sciences, Lehigh University, Bethlehem, PA 18015, USA;(2) Department of Biology, University of Maryland, College Park, MD 20742, USA |
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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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Keywords: | Mate choice Acoustic signaling Premating barrier Speciation Laupala |
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