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Copulation order, density cues and variance in fertilization success in a cestode

Published online by Cambridge University Press:  20 February 2014

D. ANDREOU  and
D. P. BENESH
D. ANDREOU
Affiliation:
Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann Str. 2, Plön, D-24306, Germany School of Applied Sciences, Bournemouth University, Talbot Campus, Poole, BH12 5BB, UK
D. P. BENESH*
Affiliation:
Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann Str. 2, Plön, D-24306, Germany
*
* Corresponding author: Current address: Marine Science Institute, University of California, Santa Barbara, CA 93106-6150, USA. E-mail: daniel.benesh@lifesci.ucsb.edu
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Summary

Simultaneous hermaphrodites maximize their fitness by optimizing their investment into male or female functions. Allocation of resources to male function (tissues, traits, and/or behaviours increasing paternity) is predicted to increase as density, and the associated level of sperm competition, increases. We tested whether the simultaneous hermaphroditic cestode Schistocephalus solidus uses cues of potential partner densities in its fish intermediate host to improve its male reproductive success in the final host. We had two worms, one originating from a multiple infection in the fish intermediate host and one from a single infection, sequentially compete to fertilize the eggs of a third worm. The fertilization rates of the two competitors nearly always differed from the 50–50 null expectation, sometimes considerably, implying there was a ‘winner’ in each experimental competition. However, we did not find a significant effect of density in the fish host (single vs multiple) or mating order on paternity. Additional work will be needed to identify the traits and environmental conditions that explain the high variance in male reproductive success observed in this experiment.

Keywords

copulation orderSchistocephalus solidussperm competitionsimultaneous hermaphroditesex allocationsexual selection
Type
Research Article
Information
Parasitology , Volume 141 , Issue 7 , June 2014 , pp. 934 - 939
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Copyright
Copyright © Cambridge University Press 2014 

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