Craniometric variation in a population of mantled howler monkeys (Alouatta palliata): evidence of size selection in females and growth in dentally mature males.
Craniometric variation in a population of mantled howler monkeys (Alouatta palliata): evidence of size selection in females and growth in dentally mature males.
复制标题
鬃毛吼猴（Alouatta palliata）种群的颅骨测量变化：雌性体型选择和牙齿成熟雄性生长的证据。
DOI：
--
复制
发表时间：
2000
影响因子：
2.8
通讯作者：
K. Milton
中科院分区：
文献类型：
--
作者：
A. Jones;D. Degusta;S. P. Turner;C. J. Campbell;K. Milton
大量关于猴颅骨指标的研究（涉及种间变异、性二型和个体发育的结论）都依赖于这样的假设，即随着牙齿的成熟，生长有效地停止，种内变异可以忽略不计。我们测试这些假设的变化，在39个测量的166牙齿成熟Alouatta palliata头骨发现死亡的动物巴罗科罗拉多岛（BCI），巴拿马。我们还调查了这个群体是否是基于大小的选择，因为我们发现死亡的样本反映了这个群体的自然死亡率。根据牙合面磨损程度将样本分为三个年龄阶段（A-C，最小磨损到最大磨损）。对于三个颅骨测量值，女性A期平均值显著小于女性B期平均值。女性B期平均值显著小于女性C期平均值的5个颅骨测量值。对于21项颅骨测量，A期男性平均值显著小于B期男性平均值。多变量分析证实了成年年龄阶段之间的这种扩张趋势。牙齿测量和缝线闭合数据表明，女性的颅骨扩张是由于基于尺寸的选择，而男性的颅骨扩张是由于牙齿成熟后的显着增长。性二型率在不同的A. palliata，表明该物种的种群之间的二型性变化。这些结果提供了深入了解的选择性力量运作的BCI吼和挑战的有效性，许多研究池亚种，并假设增长停止成熟。
A large body of work on monkey cranial metrics (involving conclusions about interspecific variation, sexual dimorphism, and ontogeny) depends on the assumptions that growth effectively ceases with dental maturity and that intraspecific variation is negligible. We test these assumptions by examining variation in 39 measurements of 166 dentally mature Alouatta palliata skulls from animals found dead on Barro Colorado Island (BCI), Panama. We also investigate whether this population is under size-based selection, since our found-dead sample reflects the natural mortality in this population. The sample was divided into three age stages by occlusal wear (A-C, least to most wear). Female stage A means are significantly smaller than female stage B means for three cranial measures. Female stage B means are significantly smaller than female stage C means for five cranial measures. Male stage A means are significantly smaller than male stage B means for 21 cranial measures. Multivariate analyses confirm this trend of expansion between adult age stages. The dental metric and suture closure data suggest that the cranial expansion in females is due to size-based selection, while the cranial expansion in males is due to significant growth after dental maturity. Sexual dimorphism ratios are highly variable across different samples of A. palliata, indicating that dimorphism varies between populations of this species. These results provide insight into the selective forces operating on the BCI howlers and challenge the validity of the many studies which pool subspecies and assume growth ceases with maturity.