COVARIATION BETWEEN CLUTCH SIZE, EGG WEIGHT AND EGG SHAPE - COMPARATIVE EVIDENCE FOR CHELONIANS
COVARIATION BETWEEN CLUTCH SIZE, EGG WEIGHT AND EGG SHAPE - COMPARATIVE EVIDENCE FOR CHELONIANS
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DOI：
10.1111/j.1469-7998.1989.tb02572.x
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发表时间：
1989-09-01
影响因子：
2
通讯作者：
HEAPHY, LJ
中科院分区：
文献类型：
--
作者：
ELGAR, MA;HEAPHY, LJ
繁殖变量的变化在龟种内和种间都有记载。在属水平和家系水平上，平均体重和窝卵大小与成虫甲长呈显著正相关。剔除个体大小和蛋重的影响后，窝卵数和蛋重在不同的属和科之间呈负相关，在这两个生活史特征之间存在进化权衡和个体大小的影响。然而，暗示和进化的权衡并不完全，因为在剔除体型大小的影响后，产卵大小与产卵重量呈正相关。与淡水或海洋物种相比，陆生物种产卵更少、更大，但这种联系在统计学上是混乱的，因为龟科形成了生态群体。去掉个体大小的影响后，栖息地和窝卵重之间没有显著的相关性，纬度与卵重和窝卵大小之间也没有显著的相关性，但温带物种在去掉体型大小的影响后有更重的窝卵重量。体型较大的物种产下的卵更圆，但在控制了身体大小后，卵的形状与产卵的大小无关。文中还讨论了成虫体重、卵重和窝卵大小之间的协变规律，并与鸟类和哺乳动物的报道进行了对比，并讨论了产生这些差异的一些原因。
The variation in reproductive variables is documented both within and across species of chelonians. At both the generic and family levels, ege weight and clutch size show positive, significant correlations with adult carapace length. There is a negative correlation across both genera and families between clutch size and egg weight after removing the effects of body size, and egg weight after removing the effects of body size suggesting and evolutionary trade-off between these two life-history characteristics. However, the suggesting and evolutionary trade-off is not complete, since clutch size is positively correlated with clutch weight after removing the effects of body size. Terrestrial species lay fewer and larger eggs for their size than freshwater or marine species, but this association is statisitically confounded by the fact that chelonian families form ecological groups. There is no significant association between habitat and clutch weight after removing the effects of body size, nor between latitude and either egg weight or clutch size, but temperate species have a heavier clutch weight after removing the effects of body size. Larger species lay eggs that are more spherical, but after controlling for body size, egg shape is not associated with clutch size. The pattern of covariation between adult weight, egg weight and clutch size contrast with those reported for birds and mammals, and some reasons for these differences are discussed.