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波动不对称(FA)是压力的随机性引发双侧完美对称偏离的现象,这是个体无力免受发展中不利因素(如早期营养不良)侵害的一个标志。比较个体口腔两侧牙齿的大小是一种测量 FA 的方法。本研究汇集了 10 个物种共 296 名个体的牙齿测量结果,测量对象包括黑猩猩(学名 Pan troglodytes)、猩猩(学名Pongo pygmaeus)、大猩猩(学名 Gorilla gorilla)、智人(学名 Homo sapiens),以及许多化石人。分析发现,猩猩样本牙齿的 FA 水平要显著低于大猩猩、黑猩猩、直立人、尼安德特人和智人样本的 FA 水平。而与之相反的是,智人与尼安德特人样本的牙齿 FA 水平要显著高于其它任何一种巨猿样本的 FA 水平。该文提出了有关缓和的选择压力的解释。
Fluctuation Asymmetry (FA) is a phenomenon where the randomness of pressure triggers a perfect symmetrical deviation of both sides, a hallmark of an individual’s inability to suffer from unfavorable factors of development such as early malnutrition. Comparing the size of the teeth on both sides of an individual’s mouth is a method of measuring FA. This study brings together measurements of the teeth of 296 individuals in 10 species, including chimpanzees (Pan troglodytes), apes (Pongo pygmaeus), gorillas (Gorilla gorilla), Homo sapiens Many fossil people. Analysis found that FA levels in orangutan samples were significantly lower than those in gorillas, chimpanzees, erects, Neandertals and Homo sapiens. In contrast, Homo sapiens and Neanderthal samples had FA levels significantly higher than those of any other great ape sample. This article presents an explanation of the pressures of moderation.