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dc.contributor.authorLorch, Patrick Den_UK
dc.contributor.authorBussiere, Lucen_UK
dc.contributor.authorGwynne, Darryl Ten_UK
dc.description.abstractSex differences in the correlation between number of offspring and number of mates likely drive much of the evolution of morphological and behavioral sexual differences. These correlations have traditionally been represented by slopes from regressions of number of offspring on number of mates (Bateman gradients). Typically the Bateman gradient is assumed to be large for males and zero for females. However, five of nine examples where male and female gradients have been measured show appreciable gradients for females. Difference in these 'actual' gradients reflect sex differences in the force driving sexual selection. In the lab it is simple to estimate the 'upper limits' on these Bateman gradients. Differences between male and female upper limits can be used to quantify the potential for sexual dimorphism. We demonstrate how to estimate these upper limits in a katydid (Conocephalus nigropleurum) where males provide females with a large food gift (nuptial gift) during mating. By mating males and females to either one or two virgin mates, we estimated the way maximum fecundity increased with additional mates for each sex, giving an estimate of the upper limit of sexual selection on each sex. We compared these estimates to predictions based on the relative value of the nuptial gift and female pre-mating fecundity. Contrary to expectation, the male upper limit did not exceed the female upper limit. Both the fact that a male's second nuptial gift was smaller than his first and that many matings failed to transfer appreciable numbers of sperm seem to have contributed to the unexpected result.en_UK
dc.publisherBrill Academic Publishersen_UK
dc.relationLorch PD, Bussiere L & Gwynne DT (2008) Quantifying the potential for sexual dimorphism using upper limits on Bateman gradients. Behaviour, 145 (1), pp. 1-24.
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.en_UK
dc.subjectsexual selectionen_UK
dc.subjectBateman's principleen_UK
dc.subjectmating frequencyen_UK
dc.subjectSex differencesen_UK
dc.subjectSexual behavior in animalsen_UK
dc.titleQuantifying the potential for sexual dimorphism using upper limits on Bateman gradientsen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreason[Quantifying the potential for sexual dimorphism.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.en_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.affiliationUniversity of Toronto at Mississauga, Canadaen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationUniversity of Torontoen_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorLorch, Patrick D|en_UK
local.rioxx.authorBussiere, Luc|0000-0001-8937-8381en_UK
local.rioxx.authorGwynne, Darryl T|en_UK
local.rioxx.projectInternal Project|University of Stirling|
local.rioxx.filenameQuantifying the potential for sexual dimorphism.pdfen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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