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Behavioral Ecology Vol. 10 No. 3: 227-233
© 1999 International Society for Behavioral Ecology

Female remating propensity contingent on sexual cannibalism in sagebrush crickets, Cyphoderris strepitans: a mechanism of cryptic female choice

J. Chadwick Johnson, Tracie M. Ivy and Scott K. Sakaluk

Behavior, Ecology, Evolution and Systematics Section, Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 USA

Address correspondence to J.C. Johnson, who is now at the Center for Ecology, Evolution and Behavior, T.H. Morgan School of Biological Sciences, University of Kentucky, Lexington, KY 40506-0225, USA.

Male sagebrush crickets (Cyphoderris strepitans) permit females to engage in an unusual form of sexual cannibalism during copulation: females feed on males' fleshy hind wings and ingest hemolymph oozing from the wounds they inflict. These wounds are not fatal, and normally only a portion of the hind wings are eaten at any one mating, so that mated males are not precluded from mating again. As a result, nonvirgin males have fewer material resources to offer females than do virgin males, such that females should be selected to preferentially mate with high-investment virgin males. We tested the hypothesis that female mating preferences favor males capable of supplying females with the highest material investment. Our results indicate that both female diet and opportunities for sexual cannibalism influence female mating behavior. Females maintained on a low-nutrient diet mounted males significantly sooner than females maintained on a high-nutrient diet, indicating that a female's overall nutrient intake may determine her propensity to mate. In addition, females were significantly more reluctant to mount and mate with males whose hind wings had been surgically removed and thus were incapable of providing females with a wing meal. Finally, females initially mated to dewinged males remated with winged males significantly sooner than females allowed to feed freely during their initial mating, resulting in cryptic female choice of investing males.

Key words: courtship feeding, cryptic female choice, Cyphoderris strepitans, sagebrush crickets, sexual cannibalism, sexual selection.


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