Larger ejaculate volumes are associated with a lower degree of polyandry across bushcricket taxa

Hdl Handle:
http://hdl.handle.net/10545/592752
Title:
Larger ejaculate volumes are associated with a lower degree of polyandry across bushcricket taxa
Authors:
Vahed, Karim
Abstract:
In numerous insects, including bushcrickets (Tettigoniidae), males are known to transfer substances in the ejaculate that inhibit the receptivity of females to further matings, but it has not yet been established whether these substances reduce the lifetime degree of polyandry of the female. The aim of this study was to test the hypothesis that larger ejaculate volumes should be associated with a lower degree of polyandry across tettigoniid taxa, controlling for male body mass and phylogeny. Data on ejaculate mass, sperm number, nuptial gift mass and male mass were taken primarily from the literature. The degree of polyandry for 14 species of European bushcrickets was estimated by counting the number of spermatodoses within the spermathecae of field-caught females towards the end of their adult lifespans. Data for four further species were obtained from the literature. Data were analysed by using both species regression and independent contrasts to control for phylogeny. Multiple regression analysis revealed that, as predicted, there was a significant negative association between the degree of polyandry and ejaculate mass, relative to male body mass, across bushcricket taxa. Nuptial gift size and sperm number, however, did not contribute further to interspecific variation in the degree of polyandry. A positive relationship was found, across bushcricket taxa, between relative nuptial gift size and relative ejaculate mass, indicating that larger nuptial gifts allow the male to overcome female resistance to accepting large ejaculates. This appears to be the first comparative evidence that males can manipulate the lifetime degree of polyandry of their mates through the transfer of large ejaculates.
Affiliation:
University of Derby
Citation:
Vahed, K 2006, 'Larger Ejaculate Volumes Are Associated with a Lower Degree of Polyandry across Bushcricket Taxa', Proceedings: Biological Sciences, 1599, p. 2387
Publisher:
The Royal Society
Journal:
Proceedings of the Royal Society B: Biological Sciences
Issue Date:
22-Sep-2006
URI:
http://hdl.handle.net/10545/592752
DOI:
10.1098/rspb.2006.3593
Additional Links:
http://rspb.royalsocietypublishing.org/cgi/doi/10.1098/rspb.2006.3593
Type:
Article
Language:
en
Series/Report no.:
Vol. 1599
ISSN:
0962-8452; 1471-2954
Appears in Collections:
Environmental Sustainability Research Centre

Full metadata record

DC FieldValue Language
dc.contributor.authorVahed, Karimen
dc.date.accessioned2016-01-04T14:11:02Zen
dc.date.available2016-01-04T14:11:02Zen
dc.date.issued2006-09-22en
dc.identifier.citationVahed, K 2006, 'Larger Ejaculate Volumes Are Associated with a Lower Degree of Polyandry across Bushcricket Taxa', Proceedings: Biological Sciences, 1599, p. 2387en
dc.identifier.issn0962-8452en
dc.identifier.issn1471-2954en
dc.identifier.doi10.1098/rspb.2006.3593en
dc.identifier.urihttp://hdl.handle.net/10545/592752en
dc.description.abstractIn numerous insects, including bushcrickets (Tettigoniidae), males are known to transfer substances in the ejaculate that inhibit the receptivity of females to further matings, but it has not yet been established whether these substances reduce the lifetime degree of polyandry of the female. The aim of this study was to test the hypothesis that larger ejaculate volumes should be associated with a lower degree of polyandry across tettigoniid taxa, controlling for male body mass and phylogeny. Data on ejaculate mass, sperm number, nuptial gift mass and male mass were taken primarily from the literature. The degree of polyandry for 14 species of European bushcrickets was estimated by counting the number of spermatodoses within the spermathecae of field-caught females towards the end of their adult lifespans. Data for four further species were obtained from the literature. Data were analysed by using both species regression and independent contrasts to control for phylogeny. Multiple regression analysis revealed that, as predicted, there was a significant negative association between the degree of polyandry and ejaculate mass, relative to male body mass, across bushcricket taxa. Nuptial gift size and sperm number, however, did not contribute further to interspecific variation in the degree of polyandry. A positive relationship was found, across bushcricket taxa, between relative nuptial gift size and relative ejaculate mass, indicating that larger nuptial gifts allow the male to overcome female resistance to accepting large ejaculates. This appears to be the first comparative evidence that males can manipulate the lifetime degree of polyandry of their mates through the transfer of large ejaculates.en
dc.language.isoenen
dc.publisherThe Royal Societyen
dc.relation.ispartofseriesVol. 1599en
dc.relation.urlhttp://rspb.royalsocietypublishing.org/cgi/doi/10.1098/rspb.2006.3593en
dc.rightsArchived with thanks to Proceedings of the Royal Society B: Biological Sciencesen
dc.subjectNuptial giftsen
dc.subjectSperm competitionen
dc.titleLarger ejaculate volumes are associated with a lower degree of polyandry across bushcricket taxaen
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.identifier.journalProceedings of the Royal Society B: Biological Sciencesen
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