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- Title
Baculum morphology predicts reproductive success of male house mice under sexual selection.
- Authors
Stockley, Paula; Ramm, Steven A.; Sherborne, Amy L.; Thom, Michael D. F.; Paterson, Steve; Hurst, Jane L.
- 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.
- Subjects
BACULUM (Anatomy); LABORATORY mice; ANIMAL models in research; SEXUAL selection; MAMMAL reproduction; ANIMAL morphology
- Publication
BMC Biology, 2013, Vol 11, Issue 1, p1
- ISSN
1741-7007
- Publication type
Article
- DOI
10.1186/1741-7007-11-66