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Influence of group size on reproductive success of female ring-tailed lemurs: distinguishing between IGFC and PFC hypotheses |
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| Authors: | Yukio Takahata Naoki Koyama Shinichiro Ichino Naomi Miyamoto Masayuki Nakamichi |
| Institution: | (1) School of Policy Studies, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan;(2) Kyoto University, Kyoto, Japan;(3) Graduate School of Asian and African Area Studies, Kyoto University, Kyoto, Japan;(4) Faculty of Human Sciences, Osaka University, Osaka, Japan |
| Abstract: | Based on data obtained over a period of 11 years from female ring-tailed lemurs (Lemur catta), we analyzed the correlation between group size and female reproductive parameters. The birth rate and mean number of surviving infants 1 year after birth per adult female generated an inverted U-shaped curve when plotted against group size (although not significant) and number of adult female members. Infant mortality rate did not have a consistent correlation with group size and number of adult female members. Thus, our findings were similar to the predictions of Wrangham’s inter-group feeding competition hypothesis. |
| Keywords: | Birth rate Female competition Group size Infant mortality Lemur catta |
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