The effects of natural substrate discontinuities on the quadrupedal gait kinematics of free‐ranging Saimiri sciureus

The effects of natural substrate discontinuities on the quadrupedal gait kinematics of free‐ranging Saimiri sciureus
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自然基质不连续性对自由放养的 Saimiri sciureus 四足步态运动学的影响

DOI:
10.1002/ajp.23055
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发表时间:
2019
影响因子:
2.4
通讯作者:
Young, Jesse W.
Young, Jesse W.
中科院分区:
生物学3区
文献类型:
--
作者:
McNamara, Allison;Dunham, Noah T.;Shapiro, Liza J.;Young, Jesse W.

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野生灵长类动物遇到的复杂基质的大小,方向,高度和顺应性不同,并经常在多个,不连续的基板上移动在一个单一的运动回合。我们目前对灵长类动物步态的理解受到人工实验室设置的限制,其中灵长类动物四足步态主要是研究。本研究分析wildSaimiri sciureus(常见的松鼠猴)步态不连续的基板捕捉现实的影响,复杂的树栖栖息地行走运动学。我们于2017年8月至10月期间在厄瓜多尔Tiputini生物多样性站收集了高速视频片段。总的来说,松鼠猴使用更多的不对称步行步态比对称步态,特别是不对称的横向序列步行步态时,跨越不连续的基板。当个人使用对称步态时,他们更多地使用对角序列步态而不是侧向序列步态。此外,个人更有可能改变他们的脚步序列在不连续的基板上大步。松鼠猴增加了触地得分同侧成对的肢体(对滞后)和成对的前肢(前肢滞后)之间的时间滞后时,走过连续基板相比,不连续的基板。研究结果表明,步态灵活性和能力,改变脚步模式在四足行走可能是至关重要的灵长类动物安全地移动在复杂的树栖栖息地。值得注意的是,野生松鼠猴四足动物是多样和灵活的,不对称行走的比例很高。在野外研究运动学对于理解灵长类动物四足行走的复杂性至关重要。
Wild primates encounter complex matrices of substrates that differ in size, orientation, height, and compliance, and often move on multiple, discontinuous substrates within a single bout of locomotion. Our current understanding of primate gait is limited by artificial laboratory settings in which primate quadrupedal gait has primarily been studied. This study analyzes wildSaimiri sciureus(common squirrel monkey) gait on discontinuous substrates to capture the realistic effects of the complex arboreal habitat on walking kinematics. We collected high‐speed video footage at Tiputini Biodiversity Station, Ecuador between August and October 2017. Overall, the squirrel monkeys used more asymmetrical walking gaits than symmetrical gaits, and specifically asymmetrical lateral sequence walking gaits when moving across discontinuous substrates. When individuals used symmetrical gaits, they used diagonal sequence gaits more than lateral sequence gaits. In addition, individuals were more likely to change their footfall sequence during strides on discontinuous substrates. Squirrel monkeys increased the time lag between touchdowns both of ipsilaterally paired limbs (pair lag) and of the paired forelimbs (forelimb lag) when walking across discontinuous substrates compared to continuous substrates. Results indicate that gait flexibility and the ability to alter footfall patterns during quadrupedal walking may be critical for primates to safely move in their complex arboreal habitats. Notably, wild squirrel monkey quadrupedalism is diverse and flexible with high proportions of asymmetrical walking. Studying kinematics in the wild is critical for understanding the complexity of primate quadrupedalism.
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