Reproductive traits of the gray ratsnake Ptyas korros from three geographically distinct populations
Reproductive traits of the gray ratsnake Ptyas korros from three geographically distinct populations
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三个不同地理种群的灰鼠蛇 Ptyas korros 的繁殖特性
DOI：
10.1093/czoolo/58.6.820
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发表时间：
2012-01-01
期刊：
影响因子：
2.2
通讯作者：
Ji, Xiang
中科院分区：
文献类型：
--
作者：
Lin, Long-Hui;Mao, Fei;Ji, Xiang
以中国郴州、江山和定海3个不同地理种群的灰腹青蛇Ptyas korros为材料，研究了雌性生殖性状的地理变异。三个种群的产卵期不同，北方纬度最高的种群产卵最晚，而纬度最低的种群产卵最早。窝卵数、窝卵质量、卵质量、卵形、窝卵内卵大小的变异性和相对窝卵质量在三个种群之间存在差异，而产卵后体重则无差异。除产卵日期外，没有一个性状的变化在地理上连续的趋势。CZ和DH女性，虽然分开的距离约1100公里的乌鸦飞，在几乎所有的性状检查相似。JS雌虫与CZ和DH雌虫的区别在于其较高的产卵量（窝卵数）、较大的繁殖产量（窝卵质量）和较圆的卵。我们的数据并没有证实更大的后代应该在寒冷的地方产生的预测。在三个种群中，每个种群都没有蛋的大小-数量权衡，这大概表明，P. korros是种群中蛋的大小得到很好优化的物种之一（Current Zoology 58（6）：820-827，2012）。
We collected gravid gray rat snakes Ptyas korros from three geographically distinct populations in China, Chenzhou (CZ), Jiangshan (JS) and Dinghai (DH), to study geographical variation in female reproductive traits. Egg-laying dates differed among the three populations such that at the most northern latitude egg-laying was latest, and earliest at the most southern lati- tutde. Clutch size, clutch mass, egg mass, egg shape, within clutch variability in egg sizes and relative clutch mass differed among the three populations, whereas post-oviposition body mass did not. Except for egg-laying date, none of the traits examined varied in a geographically continuous trend. CZ and DH females, although separated by a distance of approximately 1100 km as the crow flies, were similar in nearly all traits examined. JS females were distinguished from CZ and DH females by their higher fe- cundity (clutch size), greater reproductive output (clutch mass) and more rounded eggs. Our data do not validate the prediction that larger offspring should be produced in colder localities. The absence of an egg size-number trade-off in each of the three populations presumably suggests that P. korros is among species where eggs are well optimized for size within a population (Current Zoology 58 (6): 820-827, 2012).