Baculum morphology predicts reproductive success of male house mice under sexual selection
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ICR Authors
Authors
Document Type
Journal Article
Date
2013-06-01
Date Accepted
Abstract
Background: Diversity in penile morphology is characterised by extraordinary variation in the size and shape of the baculum (penis bone) found in many mammals. Although functionally enigmatic, diversity in baculum form is hypothesised to result from sexual selection. According to this hypothesis, the baculum should influence the outcome of reproductive competition among males within promiscuous mating systems. However, a test of this key prediction is currently lacking. Results: Here we show that baculum size explains significant variation in the reproductive success of male house mice under competitive conditions. After controlling for body size and other reproductive traits, the width (but not length) of the house mouse baculum predicts both the mean number of offspring sired per litter and total number of offspring sired. Conclusions: By providing the first evidence linking baculum morphology to male reproductive success, our results support the hypothesis that evolutionary diversity in baculum form is driven by sexual selection.
Citation
Bmc Biology, 2013, 11
DOI
Source Title
Publisher
ISSN
1741-7007
eISSN
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Research Team
Myeloma Group