Abstract
In the katydid genus Neoconocephalus, males typically produce continuous calls with an extremely fast pulse rate of about 200/s. Divergence from this ancestral pattern includes alternation of pulse periods resulting in a double-pulse pattern, and the grouping of pulses into chirps. Double-pulse patterns evolved five times independently in the genus. Analysis of the female preferences and call recognition mechanisms revealed that in three species with double-pulse pattern, females have independently evolved new mechanisms for recognizing the derived call pattern. In the remaining two species with double-pulse pattern, females retain the ancestral recognition mechanism and exhibit no preference for the derived temporal pattern. These results suggest that males are leading the evolutionary divergence of call patterns in this genus. We propose a hypothetical scenario in which genetic bottlenecks and founder effects arising from the climatic history of North America contributed to the rapid diversification of calls in this genus.
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Acknowledgments
We thank the numerous members of our lab for their contributions and support. Oli Beckers, Josh Deily, and Rob Snyder each contributed significantly to this research. Tom Walker and Michael Greenfield introduced JS and SLB to many aspects of Neoconocephalus natural history and helped locate many species for these studies. We would like to thank Peter Heinecke for his help in assembling and maintaining our walking compensator (“Kramer Kugel”), which has been instrumental for this work.
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Schul, J., Bush, S.L., Frederick, K.H. (2014). Evolution of Call Patterns and Pattern Recognition Mechanisms in Neoconocephalus Katydids. In: Hedwig, B. (eds) Insect Hearing and Acoustic Communication. Animal Signals and Communication, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40462-7_10
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