Ontogenetic bases of canine dimorphism in anthropoid primates
Ontogenetic bases of canine dimorphism in anthropoid primates
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DOI：
10.1002/ajpa.20096
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发表时间：
2005-07-01
影响因子：
2.8
通讯作者：
Buchanan, LS
中科院分区：
文献类型：
--
作者：
Leigh, SR;Setchel, JM;Buchanan, LS
本研究测试的假设关于犬牙齿大小二型性的个体发育在五个灵长类动物物种（Saguinus fuscicollis，猕猴，Cercocebus atys，Papio hamadryas，和Mandrillus斯芬克斯）。分析犬齿的测量和实足年龄数据，以确定犬齿两性异形是否是由双齿症（即停止萌出年龄的性别差异）引起的。通过各种回归技术评价犬身高测量值。结果表明，Saguinus缺乏两性异形。虽然大小二型性是不存在的所有物种的乳牙分析，成年的牙齿在长尾猴通过个体发育变得越来越二型。女性成年牙齿萌出规律先于男性牙齿萌出，并且基于回归的两性萌出轨迹在女性牙齿达到成年大小的年龄处相交。男性比女性更晚更快地长出牙齿。男性也达到了一个更大的成年人的大小比女性长出牙齿的时间更长。在二态性的产生中，双质性是主要的，但喷发速率显示出适度的变化。这些结果表明，通过雄性间的竞争作为一个主要因素，确定男性喷发时间，喷发率和成人大小的性选择的调度。生活史因素可能在决定性内竞争的时间安排和犬齿萌出之间的关系中起作用。女性的贡献性二型性在这些物种中是显而易见的，这表明类似水平的二型性可以通过不同的个体发育途径实现。(c)2005 Wiley-Liss，Inc.
This study tests hypotheses regarding the ontogeny of canine tooth size dimorphism in five anthropoid primate species (Saguinus fuscicollis, Macaca mulatta, Cercocebus atys, Papio hamadryas, and Mandrillus sphinx). Canine measurements and chronological age data are analyzed to determine if bimaturism, a sex difference in the age at which eruption ceases, accounts for canine tooth sexual dimorphism. Canine height measurements are evaluated through a variety of regression techniques. Results show a lack of sexual dimorphism in Saguinus. While size dimorphism is absent in the deciduous teeth of all species analyzed, the adult teeth in cercopithecines become increasingly dimorphic through ontogeny. Female adult tooth eruption regularly precedes male tooth eruption, and regression-based eruption trajectories for both sexes intersect at about the age at which the female tooth reaches adult size. Males erupt the tooth later and more rapidly than females. Males also reach a larger adult size than females by erupting the tooth for much longer periods of time. Bimaturism is primary in the production of dimorphism, but rates of eruption show modest variation. These results point to the scheduling of sexual selection through intermale competition as a primary factor determining male eruption timing, rates of eruption, and adult size. Life history factors may play a role in determining the relations between the scheduling of intrasexual competition and canine eruption. Female contributions to sexual dimorphism are apparent in these species, suggesting that similar levels of dimorphism can be attained through diverse ontogenetic pathways. (c) 2005 Wiley-Liss, Inc.