Schwartz G G, Rosenblum L A
Am J Phys Anthropol. 1981 May;55(1):9-12. doi: 10.1002/ajpa.1330550103.
Allometric analyses of hair densities in 23 anthropoid primate taxa reveal that increasingly massive primates have systematically fewer hairs per equal unit of body surface. Considering the absence of effective sweating in monkeys and apes, the negative allometry of relative hair density may represent an architectural adaptation to thermal constraints imposed by the decreasing ratios of surface area to volume in progressively massive primates. Judging by estimates of body volume, denudation of the earliest hominids should have progressed to a considerable extent prior to their shift from a forest to a grassland habitat during the Pliocene. We propose that, lacking a reflective coat of hair, the exploitation of eccrine sweating emerged as the primary mechanism for adaptation to the increased heat leads of man's new environment and permitted further reduction of the remnant coat to its present vestigial condition.
对23种类人猿灵长类动物毛发密度的异速生长分析表明，体型越来越大的灵长类动物，每单位体表面积的毛发数量系统性地减少。鉴于猴子和猿类缺乏有效的排汗能力，相对毛发密度的负异速生长可能代表了一种结构上的适应，以应对体型逐渐增大的灵长类动物表面积与体积之比下降所带来的热约束。根据身体体积的估计判断，最早的原始人类在更新世从森林栖息地转移到草原栖息地之前，脱毛过程应该已经有了相当程度的进展。我们认为，由于缺乏有反射作用的毛发覆盖，利用外泌汗腺排汗成为适应人类新环境中增加的热负荷的主要机制，并使得残余毛发进一步减少到目前的退化状态。
