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首页> 外文期刊>Herpetologica >Proximate contributions to adult body size in two species of dusky salamanders (Plethodontidae: Desmognathus)
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Proximate contributions to adult body size in two species of dusky salamanders (Plethodontidae: Desmognathus)

机译：两种灰sal（Plethodontidae：Desmognathus）对成年体型的最大贡献

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I used skeletochronological data to evaluate the contributions of propagule size, larval/juvenile growth, and age at first reproduction to differences in adult body size in two species of plethodontid salamanders of the genus Desmognathus. The traits in question were evaluated in populations of the larger D. quadramaculatus and smaller D. monticola in the southern Blue Ridge Mountains of North Carolina, USA. Gompertz and von Bertalanffy functions were fitted to the plots of standard length on skeletochronological age of each complete sample (larvae and/or juveniles, and adults) of earlier data sets; linear functions were fitted to data of immatures (larvae and/or juveniles). In order to examine the relationship of body mass and age, I conducted regressions of body mass on standard length in later samples of both species, calculated estimated body masses of the salamanders in the skeletochronological data sets, and then fitted a modified Gompertz function to each plot of body mass on age. The results showed that age at first reproduction is the principal factor contributing to differences between the species in size at first reproduction and adult size. Larger propagule sizes (i.e., hatching sizes) in D. quadramaculatus versus D. monticola may also be a factor; however, there is no evidence that a difference in larval/juvenile growth rate contributes to the adult size differential. Comparison of two populations of D. monticola suggested that small differences in adult body size result mainly from slight differences in age at first reproduction. Tradeoffs among propagule size, clutch size, growth, and age and size at first reproduction are discussed in the context of selective pressures that may have generated diversification in body size and life history in the genus.
机译：我使用骨骼年代学数据来评估繁殖体大小，幼体/幼体生长和初次繁殖的年龄对地蝇属两种正畸齿sal的成年体型差异的影响。在美国北卡罗来纳州南部的蓝岭山脉的较大的四头。和较小的D. monticola种群中评估了所讨论的性状。将Gompertz和von Bertalanffy函数拟合到较早数据集的每个完整样本（幼虫和/或青少年以及成年）的骨骼年代上的标准长度图。线性函数适合未成熟（幼虫和/或幼虫）的数据。为了检查体重与年龄之间的关系，我在两个物种的后来样本中对标准长度进行了体重回归，在骨骼年代学数据集中计算了estimated的估计体重，然后将修正的Gompertz函数拟合到每个体重随年龄变化的曲线图。结果表明，初次繁殖的年龄是造成初次繁殖的物种大小与成年大小之间差异的主要因素。四棱D与斑节对虾的繁殖体较大（即孵化大小）也可能是一个因素。但是，没有证据表明幼虫/幼体生长率的差异会导致成年大小差异。两种D. monticola种群的比较表明，成人体型的细微差异主要是由于初次繁殖时的年龄略有差异造成的。在选择压力的背景下，讨论了繁殖体大小，离体大小，生长，年龄和初次繁殖的大小之间的权衡，这些选择压力可能已导致该属的体型和生活史多样化。

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