Illuminating movement? Nocturnal activity patterns in chacma baboons,Journal of Zoology

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Illuminating movement? Nocturnal activity patterns in chacma baboons
Journal of Zoology ( IF 1.9 ) Pub Date : 2020-04-01 , DOI: 10.1111/jzo.12747
A. M. Ayers _{1,

2} , A. T. L. Allan _{1,

2} , C. Howlett _{1,

2,

3} , A. S. W. Tordiffe ₄ , K. S. Williams _{1,

2} , S. T. Williams _{1,

2,

5,

6} , R. A. Hill _{1,

2,

5}

Affiliation

Recent analyses have shown that typically diurnal primates may periodically exhibit some levels of activity at night. Despite this, there have been few studies that have explored whether diurnal primates living in temperate environments will extend their activity budgets to the nocturnal phase as a response to seasonal constraints. Using dual‐axis accelerometers, we explored whether chacma baboons (Papio ursinus; N = 3) in the western Soutpansberg Mountains, South Africa, responded to seasonally fluctuating levels of day length, lunar illumination, wind speed, precipitation and temperature by heightening or lowering nocturnal activity levels. Our results showed that chacma baboons engaged in low levels of activity at night throughout the year. Although baboons had heighted nocturnal activity as a response to shorter days, moonlit nights and lower temperatures, these responses were most likely due to disturbed sleeping patterns rather than more active movement. Nocturnal activity significantly dropped in a female baboon throughout the course of her pregnancy and remained low after giving birth suggesting that females with infants must increase resting. Our results compliment previous analyses which suggest that although diurnal primates may periodically be active at night, there is limited evidence for strategic use of the nocturnal phase even in highly seasonal environments.

中文翻译：

发光运动？查克马狒狒的夜间活动模式

最近的分析表明，通常昼行的灵长类动物可能会在夜间周期性地表现出一定程度的活动。尽管如此，很少有研究探讨生活在温带环境中的昼夜灵长类动物是否会将其活动预算扩展到夜间阶段，以应对季节性限制。使用双轴加速度计，我们探索了南非 Soutpansberg 山脉西部的 chacma 狒狒（Papio ursinus；N = 3）是否通过升高或降低昼长、月球光照、风速、降水和温度的季节性波动水平来响应夜间活动水平。我们的研究结果表明，查克马狒狒全年夜间活动水平较低。尽管狒狒的夜间活动增加作为对较短白天的反应，在月夜和较低的温度下，这些反应很可能是由于睡眠模式受到干扰而不是更积极的运动。雌性狒狒在整个怀孕过程中的夜间活动显着下降，并且在分娩后保持低水平，这表明有婴儿的雌性必须增加休息时间。我们的结果与之前的分析相辅相成，这表明尽管昼夜灵长类动物可能会在夜间定期活跃，但即使在高度季节性的环境中，战略性使用夜间阶段的证据也有限。雌性狒狒在整个怀孕过程中的夜间活动显着下降，并且在分娩后保持低水平，这表明有婴儿的雌性必须增加休息时间。我们的结果与之前的分析相辅相成，这表明虽然昼夜灵长类动物可能会在夜间定期活跃，但即使在高度季节性的环境中，战略性使用夜间阶段的证据也有限。雌性狒狒在整个怀孕过程中的夜间活动显着下降，并且在分娩后保持低水平，这表明有婴儿的雌性必须增加休息时间。我们的结果与之前的分析相辅相成，这表明尽管昼夜灵长类动物可能会在夜间定期活跃，但即使在高度季节性的环境中，战略性使用夜间阶段的证据也有限。

更新日期：2020-04-01

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