FLUCTUATING ASYMMETRY, SEXUAL SELECTION AND CANINE TEETH IN PRIMATES
FLUCTUATING ASYMMETRY, SEXUAL SELECTION AND CANINE TEETH IN PRIMATES
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DOI：
10.1098/rspb.1993.0012
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发表时间：
1993-02-22
影响因子：
4.7
通讯作者：
CHAMBERLAIN, AT
中科院分区：
文献类型：
--
作者：
MANNING, JT;CHAMBERLAIN, AT
波动不对称是由于对称性的微小偏差而产生的，这种偏差可以在身体的两侧表现出来。波动不对称性的增加可能表明基因组压力，例如定向选择的结果。有人认为，表位结构和武器应该表现出高度波动的不对称性，因为性选择本质上是定向的。我们通过检查 21 种旧大陆灵长类动物上犬齿的波动不对称表达来验证这一预测。我们发现，对于雄性而非雌性来说，不对称性与性选择的测量相关，包括犬二态性、犬的大小、群体二态性和雄性内部竞争。然而，与饮食类型和体重没有显着相关性，与性选择只有微弱的相关性。系统发育惰性并不能解释波动不对称性与性选择之间的关联。我们还发现，具有高犬二态性和雄性内部竞争值的物种往往在不对称性和平均犬齿高度之间存在负相关，并且后一种效应在雄性和雌性中都存在。讨论了这些发现对性选择理论的影响。
Fluctuating asymmetry arises as small deviations from symmetry which can be expressed on either side of the body. Increases in fluctuating asymmetry can suggest genomic stress such as results from directional selection. It has been argued that epigamic structures and weapons should show high levels of fluctuating asymmetry because sexual selection is essentially directional in nature. We tested this prediction by examining the expression of fluctuating asymmetry in the upper canines of 21 species of Old World primates. We found, for males but not for females, that asymmetry was correlated with measures of sexual selection including canine dimorphism, canine size, mass dimorphism, and intra-male competition. However, there was no significant correlation with diet type and body mass, which are only weakly associated with sexual selection. Phylogenetic inertia did not account for the association between fluctuating asymmetry and sexual selection. We also found that species with high values of canine dimorphism and intra-male competition tended to have a negative correlation between asymmetry and mean canine height, and this latter effect was present in both males and females. The implications of these findings for sexual selection theory are discussed.