activity predicts male reproductive success in a polygynous lizard在一夫多妻制蜥蜴活动预测男性生殖成功.pdfVIP

Activity Predicts Male Reproductive Success in a Polygynous Lizard 1 2 1 2 J. Scott Keogh *, Daniel W. A. Noble , Eleanor E. Wilson , Martin J. Whiting 1 Division of Evolution, Ecology and Genetics, Research School of Biology, The Australian National University, Canberra, Australia, 2 Department of Biological Sciences, Division of Brain, Behaviour and Evolution, Macquarie University, Sydney, Australia Abstract Activity patterns and social interactions play a key role in determining reproductive success, although this is poorly understood for species that lack overt social behaviour. We used genetic paternity analysis to quantify both multiple paternity and the relative roles of activity and social behaviour in determining reproductive success in a nondescript Australian lizard. During the breeding season we intensively followed and recorded the behaviour of a group of seven males and 13 females in a naturalistic outdoor enclosure to examine the relative roles of body size, activity and social interactions in determining male fertilization success. We found multiple paternity in 42% of clutches. No single behaviour was a significant predictor of male fertilization success in isolation, but male-female association, interactions and courtship explained 41% of the variation in male fertilization success. Males with the highest number of offspring sired invested heavily in interacting with females but spent very little time in interactions with males. These same males also sired offspring from more clutches. When taken collectively, an index of overall male activity, including locomotion and all social interactions, significantly explained 81%