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Sperm death and dumping in Drosophila

Snook, R.R. and Hosken, D.J. (2004) Sperm death and dumping in Drosophila. Nature, 428 (6986). pp. 939-941. ISSN 0028-0836


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Mating with more than one male is the norm for females of many species. In addition to generating competition between the ejaculates of different males, multiple mating may allow females to bias sperm use. In Drosophila melanogaster, the last male to inseminate a female sires approximately 80% of subsequent progeny. Both sperm displacement, where resident sperm are removed from storage by the incoming ejaculate of the copulating male, and sperm incapacitation, where incoming seminal fluids supposedly interfere with resident sperm, have been implicated in this pattern of sperm use. But the idea of incapacitation is problematic because there are no known mechanisms by which an individual could damage rival sperm and not their own. Females also influence the process of sperm use, but exactly how is unclear. Here we show that seminal fluids do not kill rival sperm and that any 'incapacitation' is probably due to sperm ageing during sperm storage. We also show that females release stored sperm from the reproductive tract (sperm dumping) after copulation with a second male and that this requires neither incoming sperm nor seminal fluids. Instead, males may cause stored sperm to be dumped or females may differentially eject sperm from the previous mating.

Item Type: Article
Copyright, Publisher and Additional Information: © 2004 Nature Publishing Group
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > School of Biological Sciences (Sheffield) > Department of Animal and Plant Sciences (Sheffield)
Depositing User: Repository Officer
Date Deposited: 20 Sep 2004
Last Modified: 05 Jun 2014 07:49
Published Version: http://www.nature.com/nature
Status: Published
Refereed: Yes
Identification Number: 10.1038/nature02455
URI: http://eprints.whiterose.ac.uk/id/eprint/103

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