Assessing male gelada chest patches: color measurement and physiological mechanisms
Assessing male gelada chest patches: color measurement and physiological mechanisms
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DOI：
10.1007/s42991-021-00211-5
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发表时间：
2022-02-22
影响因子：
1.6
通讯作者：
Bergman, Thore J.
中科院分区：
文献类型：
--
作者：
DeLacey, Patricia M.;Perlman, Rachel F.;Bergman, Thore J.
选择压力在众多分类群中都有利于显著的体色。显著体色的一个特别突出的例子是雄性狮尾狒（Theropithecus gelada）鲜艳的红色胸部斑块，狮尾狒是一种在埃塞俄比亚高海拔地区发现的猕猴属猴子。先前的研究发现，狮尾狒胸部斑块的红色程度随着年龄（成年与亚成年）、社会地位（“首领”与非首领）以及交配机会（成年雌性的数量）而增加，但调节红色程度变化的机制尚未得到研究。首先，我们验证并比较了多种颜色测量方法（Adobe Photoshop、专为ImageJ设计的micaToolbox以及用人眼进行的主观测量）。其次，我们证明胸部斑块的红色程度与高强度的体力活动、直接在胸部皮肤使用热敷袋以及较高的胸部皮肤表面温度呈正相关。总之，这些结果表明胸部红色程度的增加是由流向该区域的血液增加以及伴随的表面温度升高所介导的。需要进一步的研究来了解与红色相关的能量成本以及其他雄性对该信号变化的反应。
Selective pressures have favored conspicuous coloration across a wide variety of taxa. A particularly striking example of conspicuous coloration is the brilliant red chest patch of male geladas (Theropithecus gelada), a species of cercopithecine monkey found in the high-altitude regions of Ethiopia. Previous research found that gelada chest patch redness increases with age (adult vs subadult), social status ("leader" vs non-leader), and mating opportunities (number of adult females), but the mechanism mediating changes in redness has not yet been examined. First, we validated and compared multiple color measurement methods (Adobe Photoshop, micaToolbox designed for use with ImageJ, and a subjective measure using the human eye). Second, we demonstrated that chest patch redness is positively associated with high-intensity physical activity, the application of a heat pack directly to the chest skin, and higher chest skin surface temperatures. Together, these results suggest that increases in chest redness are mediated by increased blood flow to this area with a concomitant increase in surface temperature. Further research is needed to understand both the energetic costs associated with redness and how other males respond to variation in the signal.