Experimental variation in polyandry affects parasite loads and fitness in a bumble-bee

Boris Baer and Paul Schmid-Hempel ()
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Boris Baer: ETH Zürich, Experimental Ecology
Paul Schmid-Hempel: ETH Zürich, Experimental Ecology

Nature, 1999, vol. 397, issue 6715, 151-154

Abstract: Abstract In many species of animals, females typically mate with more than one male (polyandry). Some social insects carry this behaviour to extremes1. For example, honeybee queens mate with ten to twenty (or even more) males on their nuptial flights2. The reasons for this behaviour remain unknown, given the obvious costs of time, energy and exposure to predation. Several potential benefits of polyandry have been proposed1,3,3,4, but none are well supported yet. Here we test the hypothesis that genetic diversity among a female's offspring may offer some protection from parasitism5,6,7. We artificially inseminated queens of a bumble-bee (Bombus terrestris L.) with sperm of either low or high genetic diversity. The resulting colonies were exposed to parasitism under field conditions. High-diversity colonies had fewer parasites and showed greater reproductive success, on average, than did low-diversity colonies. We suggest that female mating frequency may be influenced in part by parasites.

Date: 1999
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DOI: 10.1038/16451

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