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Proc Biol Sci

Title:		"The Coolidge effect, individual recognition and selection for distinctive cuticular signatures in a burying beetle"
Author(s):		Steiger S; Franz R; Eggert AK; Muller JK;
Address:		"Department of Evolutionary Biology and Ecology, Faculty of Biology, University of Freiburg, Hauptstrasse 1, 79104 Freiburg, Germany. sandra.steiger@biologie.uni-freiburg.de"
Journal Title:		Proc Biol Sci
Year:		2008
Volume:		275
Issue:		1645
Page Number:		1831 - 1838
DOI:		10.1098/rspb.2008.0375
ISSN/ISBN:		0962-8452 (Print) 1471-2954 (Electronic) 0962-8452 (Linking)
Abstract:		"The ability to recognize individuals is an important aspect of social interactions, but it can also be useful to avoid repeated matings with the same individual. The Coolidge effect is the progressive decline in a male's propensity to mate with the same female combined with a heightened sexual interest in new females. Although males that recognize previous partners and show a preference for novel females should have a selective advantage as they can distribute sperm evenly among the females they encounter, there are few invertebrate examples of the Coolidge effect. Here we present evidence for this effect in the burying beetle Nicrophorus vespilloides and examine the mechanism underlying the discrimination between familiar and novel mates. Burying beetles feed and reproduce on vertebrate carcasses, where they regularly encounter conspecifics. Males showed greater sexual interest in novel females (virgin or mated) than in females they had inseminated before. The application of identical cuticular extracts allowed us to experimentally create females with similar odours, and male responses to such females demonstrated that they use female cuticular patterns for discrimination. The chemical analysis of the cuticular profile revealed greater inter-individual variation in female than in male cuticular patterns, which might be due to greater selection on females to signal their individual identity"
Keywords:		"Animals Coleoptera/genetics/*metabolism Female Inbreeding Male Pheromones/*metabolism Recognition, Psychology Selection, Genetic *Sexual Behavior, Animal;"
Notes:		"MedlineSteiger, Sandra Franz, Ragna Eggert, Anne-Katrin Muller, Josef K eng Research Support, Non-U.S. Gov't England 2008/05/15 Proc Biol Sci. 2008 Aug 22; 275(1645):1831-8. doi: 10.1098/rspb.2008.0375"