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Sperm Trading Can Resolve Hermaphrodite Mating Conflicts

Date:
October 13, 2005
Source:
Cell Press
Summary:
By directly manipulating mating performance in a tropical sea slug, Chelidonura hirundinina, researchers of the University of Tübingen have now shed light on the bizarre reproductive conflicts encountered by hermaphroditic animals. In some hermaphroditic species, such as C. hirundinina, mating partners may insist on copulating as a "male," "female," or both, resulting in unique biological conflicts over gender.

By directly manipulating mating performance in a tropical sea slug, Chelidonura hirundinina, researchers of the University of Tübingen have now shed light on the bizarre reproductive conflicts encountered by hermaphroditic animals.
Credit: Anthes et al./Current Biology

Sexual interactions in so-called cross-fertilizingsimultaneous hermaphrodites, such as earthworms, snails, leeches, andsome fishes, have long challenged researchers' understanding of howestablished theories regarding sexual selection apply in cases ofhermaphroditic species. For example, combining male and female genderin one and the same individual, hermaphrodites have been predicted tofrequently be at conflict (theoretically speaking) about which sexualroles to play, because matings are often more costly, in terms ofevolutionary fitness, to one gender than to the other. In such cases,hermaphrodites are predicted to share a preference to copulate in themore beneficial gender role. This would appear to make the interests ofany two potential mates incompatible. For 20 years, evolutionarybiologists have speculated that hermaphrodites may solve such matingconflicts by "trading sperm," that is, giving sperm only when themating partner follows suit. However, this prediction had never beenproven experimentally.

In the new work, researchers Nils Anthes,Annika Putz, and Nico Michiels generated individual sea slughermaphrodites only capable of performing a "dry" copulation--that is,without sperm transfer. Sea slugs that mated with such a "cheating"partner interrupted sexual intercourse significantly sooner than didcontrol pairs. This supports the concept of sperm trading, where matesnegotiate mating roles in order to balance sexual interactions.

###

Theresearchers included Nils Anthes, Annika Putz and Nico K. Michiels ofUniversität Tübingen in Tübingen, Germany. This research was supportedby the DFG and DAAD.

Anthes et al.: "Gender trading in a hermaphrodite." Publishing in Current Biology Vol 15, pages R792-R793, October 11, 2005 www.current-biology.com


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The above story is based on materials provided by Cell Press. Note: Materials may be edited for content and length.


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Cell Press. "Sperm Trading Can Resolve Hermaphrodite Mating Conflicts." ScienceDaily. ScienceDaily, 13 October 2005. <www.sciencedaily.com/releases/2005/10/051011072817.htm>.
Cell Press. (2005, October 13). Sperm Trading Can Resolve Hermaphrodite Mating Conflicts. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2005/10/051011072817.htm
Cell Press. "Sperm Trading Can Resolve Hermaphrodite Mating Conflicts." ScienceDaily. www.sciencedaily.com/releases/2005/10/051011072817.htm (accessed October 21, 2014).

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