The evolution of sperm and non-sperm producing organs in male Drosophila

Kraaijeveld, Ken, Denniff, Matthew, Baker, Richard H. and Chapman, Tracey (2008) The evolution of sperm and non-sperm producing organs in male Drosophila. Biological Journal of the Linnean Society, 94 (3). pp. 505-512. ISSN 1095-8312

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The male ejaculate is made up of two components: sperm and non-sperm. There has been little consideration of how these two basic compartments evolve. If they are subject to trade-offs, theory predicts that when the sperm competition raffle is unfair, when seminal fluid proteins stimulate fecundity and/or when ejaculate components alter fertilization success, there will be differential selection on sperm versus non-sperm ejaculate characteristics. However, the fundamental assumption that there are trade-offs between sperm and non-sperm ejaculate compartments in Drosophila has not yet been tested. To address this, we examined testis (sperm producing) and accessory gland (non-sperm producing) size across 22 species of Drosophila. We also examined how these characters varied with copulation duration, which may represent an additional target for sperm competition. The results showed no evidence of a trade-off between testis length and accessory gland length. Copulation duration correlated negatively with accessory gland length and there was a positive correlation with testis length, but only after correcting for body size. Overall, the results suggest no evidence for gross trade-offs in sperm versus non-sperm compartments across these Drosophila species, and motivate more detailed examination of ejaculate investment patterns.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation
Faculty of Science > Research Groups > Organisms and the Environment
Depositing User: EPrints Services
Date Deposited: 01 Oct 2010 13:38
Last Modified: 16 May 2023 00:27
DOI: 10.1111/j.1095-8312.2008.01030.x

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