Female sika deer have evolved larger incisors than males under relaxed selection aeainst rapid tooth wear.
Female sika deer have evolved larger incisors than males under relaxed selection aeainst rapid tooth wear.
复制标题
在牙齿快速磨损的宽松选择下，雌性梅花鹿进化出了比雄性更大的门牙。
DOI：
10.1111/bij.12128
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发表时间：
2013
影响因子：
1.9
通讯作者：
他9名
中科院分区：
文献类型：
--
作者：
Kubo;M. O.;他9名
门齿的大小与食草性有蹄类动物的摄食效率有关，可能是根据食物习惯进行选择的。与此同时，一夫多妻制、二形物种的雄性比雌性的颊齿小，可能是因为它们的生殖期比雌性短得多。因此，当没有生殖回报时，男性不会被选择更耐用的牙齿。因此，门齿的大小预计将在自然选择对磨损和基于性别的影响下，在生殖策略的差异。我们首先调查了门齿磨损在日本西卡鹿（Cervus nippon）和比较磨损率的性别和两个生态对比种群的金刚山岛和山。Goyo.然后，我们比较了未磨损的门牙的大小，以测试的假设，母鹿有相对较大的门牙比男性和人口更快的门牙磨损有较大的门牙。金刚山鹿的磨损速度明显快于山上的鹿。Goyo和Kinkazan男性的磨损速度比Kinkazan女性快。未磨损的门齿的大小是相对较大的女性比男性和较大的金刚山鹿比山。Goyo鹿。门齿大小的性别差异在Mt.高阳鹿比金刚山的鹿多。这些研究结果支持了这一假设，即基于性别的差异，在生殖跨度的结果在更大的门牙大小的女性西卡鹿，并意味着强大的自然选择对快速牙齿磨损减少基于性别的差异，在门齿大小的金刚山鹿。© 2013伦敦林奈学会，林奈学会生物学杂志，2013，110，384-397。
Incisor size is associated with feeding efficiency in herbivorous ungulates and may have been under selection in correspondence with food habits. In the meantime, males of polygynous, dimorphic species have smaller cheek teeth than females, possibly because their reproductive span is much shorter than that of females. Thus, males are not under selection for more durable teeth when there is no reproductive return. Therefore, incisor size is expected to be under natural selection against wear and under the influence of sex-based differences in reproductive strategy. We first investigated incisor wear in Japanese sika deer (Cervus nippon) and compared wear rates between the sexes and two ecologically contrasting populations on Kinkazan Island and Mt. Goyo. We then compared unworn incisor size to test the hypotheses that female deer have relatively larger incisors than males and a population with faster incisor wear has larger incisors. The Kinkazan deer showed significantly faster wear than those on Mt. Goyo, and Kinkazan males had faster wear than Kinkazan females. Unworn incisor size was relatively larger for females than that for males and was larger for Kinkazan deer than that for Mt. Goyo deer. The sex-based difference in incisor size was greater in Mt. Goyo deer than that in Kinkazan deer. These findings support the hypothesis that sex-based differences in reproductive span result in larger incisor size for female sika deer and imply that strong natural selection against rapid tooth wear diminishes sex-based differences in incisor size in Kinkazan deer. © 2013 The Linnean Society of London,Biological Journal of the Linnean Society, 2013,110, 384–397.