Document Detail

Sons are made from old stores: sperm storage effects on sex ratio in a lizard.
MedLine Citation:
PMID:  17650477     Owner:  NLM     Status:  MEDLINE    
Sperm storage is a widespread phenomenon across taxa and mating systems but its consequences for central fitness parameters, such as sex ratios, has rarely been investigated. In Australian painted dragon lizards (Ctenophorus pictus), we describe elsewhere that male reproductive success via sperm competition is largely an effect of sperm storage. That is, sperm being stored in the female reproductive tract out-compete more recently inseminated sperm in subsequent ovarian cycles. Here we look at the consequences of such sperm storage for sex allocation in the same species, which has genetic sex determination. We show that stored sperm have a 23% higher probability of producing sons than daughters. Thus, shifts in sex ratio, for example over the reproductive season, can partly be explained by different survival of son-producing sperm or some unidentified female mechanism taking effect during prolonged storage.
Mats Olsson; Tonia Schwartz; Tobias Uller; Mo Healey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biology letters     Volume:  3     ISSN:  1744-9561     ISO Abbreviation:  Biol. Lett.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-08-31     Completed Date:  2007-10-30     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  491-3     Citation Subset:  IM    
School of Biological Sciences, University of Wollongong, Wollongong, New South Wales 2522, Australia.
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MeSH Terms
Lizards / physiology*
Sex Determination Processes*
Sex Ratio*
Spermatozoa / physiology*

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

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