首页> 美国卫生研究院文献>Proceedings of the Royal Society B: Biological Sciences >Natural selection on molar size in a wild population of howler monkeys (Alouatta palliata).
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Natural selection on molar size in a wild population of howler monkeys (Alouatta palliata).

机译:how叫猴野生种群中磨牙大小的自然选择。

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摘要

Dental traits have long been assumed to be under selection in mammals, based on the macroevolutionary correlation between dental morphology and feeding behaviour. However, natural selection acting on dental morphology has rarely, if ever, been documented in wild populations. We investigated the possibility of microevolutionary selection on dental traits by measuring molar breadth in a sample of Alouatta palliata (mantled howler monkey) crania from Barro Colorado Island (BCI), Panama. The age at death of the monkeys is an indicator of their fitness, since they were all found dead of natural causes. Howlers with small molars have significantly decreased fitness as they die, on average, at an earlier age (well before sexual maturity) than those with larger molars. This documents the existence of phenotypic viability selection on molar tooth size in the BCI howlers, regardless of causality or heritability. The selection is further shown to occur during the weaning phase of A. palliata life history, establishing a link between this period of increased mortality and selection on a specific morphological feature. These results provide initial empirical support for the long-held assumption that primate molar size is under natural selection.
机译:长期以来,人们一直以根据哺乳动物的牙齿形态和摄食行为之间的宏观进化相关性来选择牙齿的性状。但是,很少有关于野生种群中影响牙齿形态的自然选择的记载。我们通过测量来自巴拿马巴罗科罗拉多岛(BCI)的Alouatta palliata(有how叫的猴子)Crania样品的摩尔宽度来研究对牙齿特征进行微进化选择的可能性。猴子的死亡年龄是其适应性的指标,因为它们都被发现死于自然原因。臼齿较小的鼠平均死亡的年龄比臼齿较大的fitness鼠的寿命早(在性成熟之前),因此其适应力显着降低。这证明了在BCI咆哮中存在针对磨牙齿大小的表型生存能力选择,而与因果关系或遗传力无关。该选择进一步显示出发生在苍白曲霉生命史的断奶阶段,从而在死亡率增加与特定形态特征的选择之间建立了联系。这些结果为长期存在的假设提供了初步的经验支持,即灵长类动物的摩尔大小是自然选择的。

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