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

Journal article


Vahed, Karim, Parker, Darren James and Gilbert, James D. J. 2010. Larger testes are associated with a higher level of polyandry, but a smaller ejaculate volume, across bushcricket species (Tettigoniidae). Biology Letters. https://doi.org/10.1098/rsbl.2010.0840
AuthorsVahed, Karim, Parker, Darren James and 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.

KeywordsSperm competition; Testes; Ejaculation size; Polyandry
Year2010
JournalBiology Letters
PublisherThe Royal Society
ISSN1744-9561
1744-957X
Digital Object Identifier (DOI)https://doi.org/10.1098/rsbl.2010.0840
Web address (URL)http://hdl.handle.net/10545/592772
hdl:10545/592772
Publication dates10 Nov 2010
Publication process dates
Deposited04 Jan 2016, 14:30
SeriesVol. 7
Issue 2
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ContributorsUniversity of Derby
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