Larger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae)

Hdl Handle:
http://hdl.handle.net/10545/592772
Title:
Larger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae)
Authors:
Vahed, Karim ( 0000-0001-8350-2775 ) ; Parker, Darren James ( 0000-0003-4027-7779 ) ; Gilbert, James D. J.
Abstract:
While early models of ejaculate allocation predicted that both relative testes and ejaculate size should increase with sperm competition intensity across species, recent models predict that ejaculate size may actually decrease as testes size and sperm competition intensity increase, owing to the confounding effect of potential male mating rate. A recent study demonstrated that ejaculate volume decreased in relation to increased polyandry across bushcricket species, but testes mass was not measured. Here, we recorded testis mass for 21 bushcricket species, while ejaculate ( ampulla) mass, nuptial gift mass, sperm number and polyandry data were largely obtained from the literature. Using phylogenetic-comparative analyses, we found that testis mass increased with the degree of polyandry, but decreased with increasing ejaculate mass. We found no significant relationship between testis mass and either sperm number or nuptial gift mass. While these results are consistent with recent models of ejaculate allocation, they could alternatively be driven by substances in the ejaculate that affect the degree of polyandry and/or by a trade-off between resources spent on testes mass versus non-sperm components of the ejaculate.
Affiliation:
University of Derby
Citation:
Vahed, K, Parker, D, & Gilbert, J n.d., 'Larger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae)', Biology Letters, 7, 2, pp. 261-264
Publisher:
The Royal Society
Journal:
Biology Letters
Issue Date:
10-Nov-2010
URI:
http://hdl.handle.net/10545/592772
DOI:
10.1098/rsbl.2010.0840
Additional Links:
http://rsbl.royalsocietypublishing.org/cgi/doi/10.1098/rsbl.2010.0840; http://rsbl.royalsocietypublishing.org/content/suppl/2010/10/21/rsbl.2010.0840.DC1.ht
Type:
Article
Language:
en
Series/Report no.:
Vol. 7; Issue 2
ISSN:
1744-9561; 1744-957X
Appears in Collections:
Environmental Sustainability Research Centre

Full metadata record

DC FieldValue Language
dc.contributor.authorVahed, Karimen
dc.contributor.authorParker, Darren Jamesen
dc.contributor.authorGilbert, James D. J.en
dc.date.accessioned2016-01-04T14:30:17Zen
dc.date.available2016-01-04T14:30:17Zen
dc.date.issued2010-11-10en
dc.identifier.citationVahed, K, Parker, D, & Gilbert, J n.d., 'Larger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae)', Biology Letters, 7, 2, pp. 261-264en
dc.identifier.issn1744-9561en
dc.identifier.issn1744-957Xen
dc.identifier.doi10.1098/rsbl.2010.0840en
dc.identifier.urihttp://hdl.handle.net/10545/592772en
dc.description.abstractWhile early models of ejaculate allocation predicted that both relative testes and ejaculate size should increase with sperm competition intensity across species, recent models predict that ejaculate size may actually decrease as testes size and sperm competition intensity increase, owing to the confounding effect of potential male mating rate. A recent study demonstrated that ejaculate volume decreased in relation to increased polyandry across bushcricket species, but testes mass was not measured. Here, we recorded testis mass for 21 bushcricket species, while ejaculate ( ampulla) mass, nuptial gift mass, sperm number and polyandry data were largely obtained from the literature. Using phylogenetic-comparative analyses, we found that testis mass increased with the degree of polyandry, but decreased with increasing ejaculate mass. We found no significant relationship between testis mass and either sperm number or nuptial gift mass. While these results are consistent with recent models of ejaculate allocation, they could alternatively be driven by substances in the ejaculate that affect the degree of polyandry and/or by a trade-off between resources spent on testes mass versus non-sperm components of the ejaculate.en
dc.language.isoenen
dc.publisherThe Royal Societyen
dc.relation.ispartofseriesVol. 7en
dc.relation.ispartofseriesIssue 2en
dc.relation.urlhttp://rsbl.royalsocietypublishing.org/cgi/doi/10.1098/rsbl.2010.0840en
dc.relation.urlhttp://rsbl.royalsocietypublishing.org/content/suppl/2010/10/21/rsbl.2010.0840.DC1.hten
dc.rightsArchived with thanks to Biology Lettersen
dc.subjectSperm competitionen
dc.subjectTestesen
dc.subjectEjaculation sizeen
dc.subjectPolyandryen
dc.titleLarger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae)en
dc.typeArticleen
dc.contributor.departmentUniversity of Derbyen
dc.identifier.journalBiology Lettersen
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