Reproductive decisions under ecological constraints: It's about time
Reproductive decisions under ecological constraints: It's about time
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DOI：
10.1073/pnas.0901130106
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发表时间：
2009-06-16
影响因子：
11.1
通讯作者：
Hubbell, Stephen P.
中科院分区：
文献类型：
--
作者：
Gowaty, Patricia Adair;Hubbell, Stephen P.
转换点定理（SPT）是一种假设的定量陈述，即生存、配偶相遇和潜伏期的随机效应会影响个体可用于交配的时间、适应度的均值和方差，因此，最初有利于个体能够做出适应性灵活的生殖决策的进化。防止酷刑小组委员会说，人口统计学的随机性通过以下变量起作用：（一）个体生存概率，s;（二）个体相遇概率，e;（三）潜伏期，l;（四）群体中潜在配偶的数量，n;以及（五）赋予的适应性分布，w分布，共同影响平均终身适应性，并诱导个体生殖决策的适应性转变。切换点是焦点个体从接受到拒绝潜在伴侣的潜在伴侣的排名，SPT证明了在给定的生态约束时间值下最大化焦点个体的平均寿命适应度的决策规则。SPT做出了许多预测，包括赋予的适应性分布的形状会影响个人的转换点。在其他条件相同的情况下，个体生存和相遇的概率越高，可接受的潜在配偶的比例就越低，这样，焦点个体通过拒绝更多的潜在配偶来实现更高的平均终身适应度。SPT的主要预测是，焦点个体做出的每个决定都由e，s，l，n和w分布共同决定。
The switch point theorem (SPT) is the quantitative statement of the hypothesis that stochastic effects on survival, mate encounter, and latency affect individuals' time available for mating, the mean and variance in fitness, and thus, originally favored the evolution of individuals able to make adaptively flexible reproductive decisions. The SPT says that demographic stochasticity acting through variation in (i) individual survival probability, s; (ii) individual encounter probability, e; (iii) latency, l; (iv) the number of potential mates in the population, n; and (v) the distribution of fitness conferred, the w distribution, together affect average lifetime fitness, and induce adaptive switches in individual reproductive decisions. The switch point is the rank of potential mates at which focal individuals switch from accepting to rejecting potential mates, a decision rule that the SPT proves maximizes the average lifetime fitness of a focal individual under given values of ecological constraints on time. The SPT makes many predictions, including that the shape of the distribution of fitness conferred affects individual switch points. All else equal, higher probabilities of individual survival and encounter decrease the fraction of acceptable potential mates, such that focal individuals achieve higher average lifetime fitness by rejecting more potential mates. The primary prediction of the SPT is that each decision a focal individual makes is determined jointly by e, s, l, n, and the w distribution.