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Author (up) Bilde, T.; Maklakov, A.A.; Meisner, K.; la Guardia, L.; Friberg, U. url  doi
openurl 
  Title Sex differences in the genetic architecture of lifespan in a seed beetle: extreme inbreeding extends male lifespan Type Journal Article
  Year 2009 Publication BMC Evolutionary Biology Abbreviated Journal BMC Evol Biol  
  Volume 9 Issue Pages 33  
  Keywords Animals; Beetles/*genetics/physiology; Crosses, Genetic; Female; Genotype; *Inbreeding; Inheritance Patterns; Longevity/*genetics; Male; Models, Biological; *Sex Characteristics; Sexual Behavior, Animal  
  Abstract BACKGROUND: Sex differences in lifespan are ubiquitous throughout the animal kingdom but the causes underlying this phenomenon remain poorly understood. Several explanations based on asymmetrical inheritance patterns (sex chromosomes or mitochondrial DNA) have been proposed, but these ideas have rarely been tested experimentally. Alternatively, sexual dimorphism in lifespan could result from sex-specific selection, caused by fundamental differences in how males and females optimize their fitness by allocating resources into current and future reproduction. RESULTS: Here we used sex-specific responses to inbreeding to study the genetic architecture of lifespan and mortality rates in Callosobruchus maculatus, a seed beetle that shows sexual dimorphism in lifespan. Two independent assays revealed opposing sex-specific responses to inbreeding. The combined data set showed that inbred males live longer than outbred males, while females show the opposite pattern. Both sexes suffered reduced fitness measured as lifetime reproductive success as a result of inbreeding. CONCLUSION: No model based on asymmetrical inheritance can explain increased male lifespan in response to inbreeding. Our results are however compatible with models based on sex-specific selection on reproductive strategies. We therefore suggest that sex-specific differences in lifespan in this species primarily result from sexually divergent selection.  
  Address Animal Ecology/Department of Ecology and Evolution, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden. trine.bilde@biology.au.dk  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1471-2148 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:19200350 Approved no  
  Call Number GA Highlands @ mclark @ Serial 119  
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