Sperm storage and sperm competition across ovarian cycles in the dragon lizard Ctenophorus fordi
Author
Summary, in English
Female sperm storage can influence male reproductive success and may favour males that produce sperm that remain viable across several ovarian cycles. Here we show that sperm are viable in the female reproductive tract across ovarian cycles in the mallee dragon, Ctenophorus fordi. Based on experimental mating trials, we show that stored sperm were generally less likely to fertilize eggs than recently inseminated sperm. The fertilization success of stored sperm increased with male body size relative to rivals. This may be due to differences in ejaculate volume or sperm number transferred by males of different sizes. However, there was no evidence that copulation time, which is correlated with ejaculate volume, contributed to fertilization success. We suggest that sperm storage across ovarian cycles may be common in small, multi-clutched lizards and that its impact on selection on male phenotypes could contribute to the evolution of lizard mating systems.
Publishing year
2013
Language
English
Pages
404-408
Publication/Series
Journal of Experimental Zoology A
Volume
319
Issue
7
Document type
Journal article
Publisher
Wiley-Blackwell
Topic
- Biological Sciences
Status
Published