Elevation-related variation in life history traits among Phrynocephalus lineages on the Tibetan Plateau: do they follow typical squamate ecogeographic patterns?
Elevation-related variation in life history traits among Phrynocephalus lineages on the Tibetan Plateau: do they follow typical squamate ecogeographic patterns?
复制标题
青藏高原沙蜥属生活史特征与海拔相关的变化：它们是否遵循典型的有鳞动物生态地理模式？
DOI：
10.1111/jzo.12042
复制
发表时间：
2013-08-01
影响因子：
2
通讯作者：
Liu, N. F.
中科院分区：
文献类型：
--
作者：
Jin, Y. T.;Li, J. Q.;Liu, N. F.
研究了青藏高原8个近缘胎生沙蜥科（Agamidae）谱系的个体大小、窝仔数以及Bergmann和Rensch规则的证据。平均口鼻长度和（相对）腹部长度是女性大于男性，而绝对和相对平均头部大小，前肢和后肢长度是男性较大。这些模式表明，身体大小可能反映了性进化的保守性。蜥蜴在海拔较高或气候较冷的地方体型较小，这与伯格曼法则匡威。分类群间雌性个体大小的绝对差异不等于分类群间雄性个体大小的绝对差异。这导致当雄性体型回归到雌性体型时，斜率小于1，这允许拒绝Rensch的规则。雌性个体大小与海拔高度相关的梯度比相应的雄性梯度更陡。窝大小都较小，在较高的海拔变化较小。这些海拔梯度仍然应用系统发育的比较方法后，表明生态过程中发挥了更重要的作用，在塑造这些蜥蜴的大小和生殖变异的模式，而不是繁殖。有人建议，季节性活动和温度是重要的环境因素，有助于匡威伯格曼的渐变群，而在女性和性别特异性差异可塑性的生育力选择可能解释为什么模式不符合Rensch的规则。
We examined body size, litter size and evidence for Bergmann's and Rensch's rules among eight closely related viviparous Phrynocephalus (Agamidae) lineages from the Qinghai-Xizang (Tibetan) Plateau. Mean snout-vent length and (relative) abdomen length was greater in females than males, whereas absolute and relative mean head size, fore - and hindlimb length was larger in males. These patterns suggest that body size may reflect sexual evolutionary conservatism. The lizards are smaller at higher elevations or in colder climates, representing the converse of Bergmann's rule. Absolute differences in female body size among taxa are not equal to the male differences among taxa. This results in a slope less than one when male size is regressed on female size, which allows rejection of Rensch's rule for this group. The female body size elevation-related cline was steeper than the corresponding male cline. Litter sizes were both smaller and less variable at higher elevations. These elevational clines remained after application of phylogenetic comparative methods, indicating that ecological processes play a more important role than phylogeny in shaping patterns of size and reproductive variation in these lizards. It is suggested that seasonal activity and temperature are important environmental factors that contribute to the converse Bergmann's cline, while fecundity selection in females and sex-specific differential-plasticity likely explain why patterns do not conform to Rensch's rule.