Lewis E R, Hecht E I, Narins P M
Electronics Research Laboratory, University of California, Berkeley 94720.
J Comp Physiol A. 1992 Nov;171(4):421-35. doi: 10.1007/BF00194575.
In modern frogs, the amphibian papilla exhibits a caudal extension whose shape, relative length, and proportion of hair cells vary markedly from species to species. Tuning in the caudal extension is organized tonotopically and evidently involves the tectorium. In terms of the proportion of amphibian-papillar hair cells in the caudal extension, we report more diversity among 8 species of a single genus (Eleutherodactylus) on a single island (Puerto Rico) than has been found so far among all of the (more than 50) other modern anurans examined for this feature from around the world. These 8 Puerto Rican species have overlapping habitat and conspicuous diversity in the male advertisement call. For 7 of the 8 species, we report that the call has transient spectral components in the frequency range of the amphibian papilla, and that the proportion of caudal extension hair cells and the frequency distribution of those components are correlated. Thus one might conclude that the selective pressures that led to diversity of calls among the 8 species also led to diversity in form of the amphibian papilla.
在现代蛙类中，两栖乳头体呈现出一个尾部延伸部分，其形状、相对长度以及毛细胞的比例在不同物种间存在显著差异。尾部延伸部分的调谐呈音频拓扑组织，且显然涉及到盖膜。就尾部延伸部分中两栖乳头体毛细胞的比例而言，我们发现在波多黎各岛的一个单一属（雨蛙属）的8个物种之间的差异，比迄今为止在全球范围内检查过这一特征的所有其他（超过50种）现代无尾目动物之间的差异还要多。这8种波多黎各蛙类具有重叠的栖息地，并且在雄性求偶叫声方面有显著的多样性。对于这8个物种中的7个，我们报告称其叫声在两栖乳头体的频率范围内具有瞬态频谱成分，并且尾部延伸部分毛细胞的比例与这些成分的频率分布相关。因此，人们可能会得出结论，导致这8个物种间叫声多样性的选择压力，也导致了两栖乳头体形态的多样性。
