Calling characteristics of parasitized and unparasitized populations of the field cricket Teleogryllus oceanicus |
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Authors: | Marlene Zukl Leigh W Simmons Luanne Cupp |
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Institution: | (1) Department of Biology, University of California, 92521 Riverside, CA, USA;(2) Department of Environmental and Evolutionary Biology, University of Liverpool, P.O. Box 147, L69 3BX Liverpool, U.K. |
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Abstract: | Summary Examination of three populations of the field cricket Teleogryllus oceanicus revealed the presence of an acoustically-orienting parasitoid fly, Ormia ochracea (Tachinidae), in the population of crickets that has been introduced to the Hawaiian Islands. The cricket is native to Australia and the Pacific, and the fly is native to North America but has also been introduced to Hawaii. Up to 27% of males and 7% of females in Hawaii were infested with fly larvae. Song structure in the parasitized Hawaiian population was distinct from that of the other two groups, with the Hawaiian crickets showing several reduced song parameters. In addition, onset and cessation of calling at dusk and dawn were more abrupt in the Hawaiian population. These results are consistent with selective pressure from the phonotactic flies to decrease risky calling. Silent males were present in all three populations, suggesting that these noncallers may not represent a unique adaptation to the parasitoid.
Correspondence to: M. Zuk |
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Keywords: | Crickets Phonotactic parasitoids Calling characters |
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