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Author (up) Gay, L.; Hosken, D.J.; Vasudev, R.; Tregenza, T.; Eady, P.E. url  doi
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  Title Sperm competition and maternal effects differentially influence testis and sperm size in Callosobruchus maculatus Type Journal Article
  Year 2009 Publication Journal of Evolutionary Biology Abbreviated Journal J Evol Biol  
  Volume 22 Issue 5 Pages 1143-1150  
  Keywords  
  Abstract The evolutionary factors affecting testis size are well documented, with sperm competition being of major importance. However, the factors affecting sperm length are not well understood; there are no clear theoretical predictions and the empirical evidence is inconsistent. Recently, maternal effects have been implicated in sperm length variation, a finding that may offer insights into its evolution. We investigated potential proximate and microevolutionary factors influencing testis and sperm size in the bruchid beetle Callosobruchus maculatus using a combined approach of an artificial evolution experiment over 90 generations and an environmental effects study. We found that while polyandry seems to select for larger testes, it had no detectable effect on sperm length. Furthermore, population density, a proximate indicator of sperm competition risk, was not significantly associated with sperm length or testis size variation. However, there were strong maternal effects influencing sperm length.  
  Address Center for Ecology and Conservation, University of Exeter Cornwall, Tremough Campus, Penryn, UK. l.gay@exeter.ac.uk  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1010-061X ISBN Medium  
  Area Expedition Conference  
  Notes PMID:19309491 Approved no  
  Call Number Hope @ putzke @ Serial 23  
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