REPRODUCTIVE EFFORT AND TERMINAL INVESTMENT IN ITEROPAROUS ANIMALS
REPRODUCTIVE EFFORT AND TERMINAL INVESTMENT IN ITEROPAROUS ANIMALS
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DOI：
10.1086/284198
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发表时间：
1984-01-01
影响因子：
2.9
通讯作者：
CLUTTONBROCK, TH
中科院分区：
文献类型：
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作者：
CLUTTONBROCK, TH
虽然人们普遍预测，在繁殖价值随年龄下降的动物中，繁殖努力应该在寿命结束时增加，但由于测量繁殖成本的基本困难，对繁殖努力变化的分析受到阻碍。精力充沛的措施可能无法反映繁殖对随后的生存和繁殖成功的影响，特别是在身体大小随年龄增加的生物体中，而直接估计繁殖成本的尝试则因繁殖成功与亲本生存之间的正相关而变得复杂。虽然长寿的鸟类和哺乳动物是最有希望检验生殖努力随年龄增长而增加的理论的生物体之一，但生殖力的测量通常会随着母亲年龄的增加而下降。然而，最近的一些证据表明，后代的生存可能会在寿命结束时有所改善。
Though it has been widely predicted that in animals in which reproductive value declines with age, reproductive effort should increase toward the end of the lifespan, analysis of changes in reproductive effort are impeded by fundamental difficulties in measuring the costs of reproduction. Energetic measures may not reflect the effects of breeding on subsequent survival and breeding success, especially in organisms in which body size increases with age, while attempts to estimate reproductive costs directly are complicated by positive correlations between breeding success and parental survival. Though the long-lived birds and mammals are among the most promising organisms on which to test the theory that reproductive effort increases with age, measures of fecundity commonly decline with increasing maternal age. Some recent evidence suggests, however, that offspring survival may improve toward the end of the lifespan.