Abstract：
Trait functionality can act as a constraint on morphological development. Traits that become vestigialized can exhibit unstable developmental patterns such as fluctuating asymmetry (FA) and variation in populations. We use clearing and staining along with morphometric analyzes to compare FA and allometry of limbs in Western lesser sirens (Siren nettingi) to Ouachita dusky salamanders (Desmognathus brimleyorum). Our results describe new carpal phenotypes and carpal asymmetry in our sample of S. nettingi. However, we found no significant evidence of limb length asymmetry in S. nettingi. The degree of relative limb asymmetry correlates inversely with body size in both of our samples. This work provides strong evidence of increased mesopodal variation within a population of S. nettingi. Our work provides a basis for further study of a broader range of morphological traits across salamanders.
摘要：
特征功能可以作为形态发育的约束。被恢复的性状可能表现出不稳定的发育模式，例如波动的不对称（FA）和种群的变化。我们使用清除和染色以及形态计量学分析来比较西方小警报器（Sirennettingi）和Ouachita昏暗的sal（Desmognathusbrimleyorum）的FA和肢体的异形。我们的结果描述了我们的纳丁氏链球菌样本中新的腕骨表型和腕骨不对称性。然而,我们没有发现纳丁氏链球菌肢体长度不对称的显著证据.在我们的两个样本中，相对肢体不对称的程度与身体大小成反比。这项工作提供了有力的证据，证明了网汀S.种群中的中足变异增加。我们的工作为进一步研究sal的更广泛的形态特征提供了基础。
