Effects of substrate and phylogeny on quadrupedal gait in free‐ranging platyrrhines
Effects of substrate and phylogeny on quadrupedal gait in free‐ranging platyrrhines
复制标题
底物和系统发育对自由放养的鸭嘴兽四足步态的影响
DOI：
10.1002/ajpa.23942
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发表时间：
2019
影响因子：
2.8
通讯作者：
Young, Jesse W.
中科院分区：
文献类型：
--
作者：
Dunham, Noah T.;McNamara, Allison;Shapiro, Liza J.;Hieronymus, Tobin L.;Phelps, Taylor;Young, Jesse W.
灵长类对角序列（DS）步态通常被认为是一种适应移动和觅食的细分支生态位;然而，现有的数据主要来自实验室研究，在分类学的广度有限，并没有考虑到自然基质的结构和生态变化。我们测试基板的直径和方向在多大程度上影响步态序列类型和肢体相在自由放养的灵长类动物，以及如何系统发育的相关性可能条件的响应patterns.Materials and MethodsWe拍摄四足运动在11个platyrrhine物种在现场在厄瓜多尔和哥斯达黎加和测量的直径和方向的运动基板使用遥感器。我们量化的肢体相位值和分类的步伐步态序列类型（N= 988步）。ResultsOur结果表明，在我们的样本中的大多数物种始终使用DS步态，无论基板直径或方向，但是，所有类群也使用不对称和/或横向序列步态。通过将系统发育特征向量纳入我们的模型，我们发现主要阔鼻类分支之间的步态序列模式和肢体相位值存在显着差异，讨论我们的现场数据通常证实了实验室研究的运动模式，但捕捉了步态变异性和灵活性的其他方面，以应对自然环境的复杂性。环境.总的来说，我们的研究结果表明，DS步态不专为狭窄或倾斜的基板，但一般用于乔木基板。
ObjectivesPrimate diagonal sequence (DS) gaits are often argued to be an adaptation for moving and foraging in the fine‐branch niche; however, existing data have come predominantly from laboratory studies that are limited in taxonomic breadth and fail to account for the structural and ecological variation of natural substrates. We test the extent to which substrate diameter and orientation influence gait sequence type and limb phase in free‐ranging primates, as well as how phylogenetic relatedness might condition response patterns.Materials and methodsWe filmed quadrupedal locomotion in 11 platyrrhine species at field sites in Ecuador and Costa Rica and measured the diameter and orientation of locomotor substrates using remote sensors. We quantified limb phase values and classified strides by gait sequence type (N= 988 strides).ResultsOur results show that most of the species in our sample consistently used DS gaits, regardless of substrate diameter or orientation; however, all taxa also used asymmetrical and/or lateral sequence gaits. By incorporating phylogenetic eigenvectors into our models, we found significant differences in gait sequence patterns and limb phase values among the major platyrrhine clades, suggesting that phylogeny may be a better predictor of gait than substrate diameter or orientation.DiscussionOur field data generally corroborate locomotor patterns from laboratory studies but capture additional aspects of gait variability and flexibility in response to the complexity of natural environments. Overall, our results suggest that DS gaits are not exclusively tailored to narrow or oblique substrates but are used on arboreal substrates in general.