Headfirst descent behaviors in a comparative sample of strepsirrhine primates,American Journal of Primatology

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Headfirst descent behaviors in a comparative sample of strepsirrhine primates
American Journal of Primatology ( IF 2.0 ) Pub Date : 2021-04-01 , DOI: 10.1002/ajp.23259
Bernadette Perchalski _{1,

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Affiliation

The ability to safely ascend and descend is critical to the success of arboreal animals. Nonprimate mammals typically descend supports headfirst aided by their claws, but primates must rely on grasping, and use a variety of behaviors to move down within an arboreal environment, including headfirst and tailfirst descending. This study assesses hypothesized body mass limits on vertical headfirst descent and identifies approximate support orientations and diameters at which headfirst descent is ceased in a sample of nine strepsirrhines species ranging in mass from 0.06 to 4.5 kg. Species under 1 kg, arboreal quadrupeds Cheirogaleus medius and Microcebus murinus, and slow climber Nycticebus pygmaeus, always descended supports headfirst regardless of orientation and diameter as long as a grasp could be established. Arboreal quadrupedal species above 1 kg, Daubetonia madagascariensis, Eulemur coronatus, Eulemur mongoz, Lemur catta, and Varecia variegata differed in the orientation at which they ceased using headfirst descent and the types of alternative descending behaviors they employed. Lemur catta, a highly terrestrial species, started to employ tailfirst descents at 45° and completely stopped using headfirst descent on steeper and thicker supports. Other arboreal quadrupeds, D. madagascariensis, E. coronatus, E. mongoz, and V. variegata, began using tailfirst descent at 60°. The vertical clinging and leaping species Propithecus coquereli rarely engaged in above branch quadrupedalism, and individuals were observed using tailfirst descents on supports as shallow as 15°. This study shows the ways in which mass and anatomy may constrain use of headfirst descent through arboreal environments, and the alternate strategies strepsirrhine primates employ to descend.

中文翻译：

链球菌灵长类动物比较样本中的先行后裔行为

安全上升和下降的能力对于树栖动物的成功至关重要。非灵长类哺乳动物通常在爪子的帮助下头朝下下降，但灵长类动物必须依靠抓握，并使用各种行为在树栖环境中向下移动，包括头朝下和尾朝下。本研究评估了垂直头朝下下降的假设体重限制，并确定了在质量范围为 0.06 至 4.5 公斤的九种链球菌样本中停止头朝下下降的大致支撑方向和直径。1公斤以下的物种，树栖四足动物Cheirogaleus medius和Microcebus murinus，以及慢爬动物Nycticebus pygmaeus，只要可以建立抓握，无论方向和直径如何，始终下降支撑头朝下。超过 1 公斤的树栖四足动物、马达加斯加毛茛、Eulemur coronatus、Eulemur mongoz、Lemur catta和Varecia variegata 的不同之处在于它们停止使用头朝下下降的方向以及它们采用的替代下降行为的类型。狐猴 catta是一种高度陆生的物种，开始在 45° 时采用尾先下降，并在更陡峭和更厚的支撑物上完全停止使用头先下降。其他树栖四足动物、D. madagascariensis、E. coronatus、E. mongoz和V. variegata，在 60° 开始使用尾先下降。垂直依附和跳跃物种Propithecus coquereli很少从事以上分支的四足运动，并且在浅至 15° 的支撑物上使用尾先下降观察到个体。这项研究显示了质量和解剖结构可能会限制在树栖环境中使用头朝下下降的方式，以及链球菌灵长类动物用于下降的替代策略。

更新日期：2021-05-28

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