DELAYED REPRODUCTION AND FITNESS IN VARIABLE ENVIRONMENTS
DELAYED REPRODUCTION AND FITNESS IN VARIABLE ENVIRONMENTS
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DOI：
10.1073/pnas.87.3.1139
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发表时间：
1990-02-01
影响因子：
11.1
通讯作者：
TULJAPURKAR, S
中科院分区：
文献类型：
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作者：
TULJAPURKAR, S
许多生物延迟生殖的开始，即使这种延迟在恒定的环境中是不适应的。本文的理论论证表明，延迟繁殖可以在足够可变的环境中增加适应性。本文运用随机人口学的方法分析了环境不确定性引起的人口结构波动。这些结果解释了以前在自然界中观察到的令人困惑的生命周期延迟的特征，预测生活在不同严酷环境中的同一物种的种群可以显示不同的生活史表型，一些不同的生活史表型可以在单个种群中中性共存，如果杂合子具有中间生活史表型，则很容易保持遗传多态性。
Many organisms delay the initiation of reproduction even though such delay is not adaptive in a constant environment. Theoretical arguments in this paper show that delaying reproduction can increase fitness in a sufficiently variable environment. This paper uses stochastic demography to analyze the fluctuating population structure produced by environmental uncertainty. The results explain previously puzzling features of life cycle delays observed in nature, predicting that populations of the same species living in environments of differing harshness can display different life history phenotypes, a number of distinct life history phenotypes can coexist neutrally within a single population, and genetic polymorphisms are easily maintained if heterozygotes have intermediate life history phenotypes.