Document Detail

Biting off more than you can chew: sexual selection on the free amino acid composition of the spermatophylax in decorated crickets.
MedLine Citation:
PMID:  22357263     Owner:  NLM     Status:  MEDLINE    
Nuptial food gifts function to enhance male fertilization success, but their consumption is not always beneficial to females. In decorated crickets, the spermatophore transferred at mating includes a gelatinous mass, the spermatophylax, which is consumed by females after mating. However, females often discard spermatophylaxes shortly after mating, whereupon they terminate sperm transfer. We hypothesized that females discard gifts based on their assessment of the gift itself, and specifically the composition of free amino acids. We tested this hypothesis by comparing spermatophylaxes discarded by females after mating with those that were destined to be fully consumed, and employed multivariate selection analysis to quantify the strength and form of multivariate sexual selection operating on the free amino acid composition of gifts. The analysis yielded a saddle-shaped fitness surface with two local peaks. Different amino acid profiles appear to elicit continued feeding on the spermatophylax either because they offer the same level of gustatory appeal, or because they differentially affect both the gustatory appeal and texture of the spermatophylax. We conclude that the gustatory response of females to males' nuptial food gifts represents an important avenue of post-copulatory mate choice, imposing significant sexual selection on the free amino acid composition of the spermatophylax.
Susan N Gershman; Christopher Mitchell; Scott K Sakaluk; John Hunt
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-02-22
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  279     ISSN:  1471-2954     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-05-28     Completed Date:  2012-10-11     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2531-8     Citation Subset:  IM    
Behavior, Ecology, Evolution and Systematics Group, School of Biological Sciences, Illinois State University, Normal, IL 61790-4120, USA.
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MeSH Terms
Amino Acids / analysis*
Feeding Behavior
Gryllidae / physiology*
Mating Preference, Animal / physiology*
Reproduction / physiology
Sexual Behavior, Animal / physiology
Spermatogonia / chemistry*,  physiology
Reg. No./Substance:
0/Amino Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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