Giaimo Stefano, Traulsen Arne
Am Nat. 2023 Mar;201(3):404-417. doi: 10.1086/722608. Epub 2023 Jan 20.
AbstractA common measure of generation time is the average distance between two recruitment events along a genetic lineage. In populations with stage structure that live in a constant environment, this generation time can be computed from the elasticities of stable population growth to fecundities, and it is equivalent to another common measure of generation time: the average parental age of reproductive-value-weighted offspring. Here, we show three things. First, when the environment fluctuates, the average distance between two recruitment events along a genetic lineage is computed from the elasticities of the stochastic growth rate to fecundities. Second, under environmental stochasticity, this measure of generation time remains equivalent to the average parental age of reproductive-value-weighted offspring. Third, the generation time of a population in a fluctuating environment may deviate from the generation time the population would have in the average environment.
摘要
世代时间的一个常用衡量指标是沿着遗传谱系的两次补充事件之间的平均距离。在生活在恒定环境中的具有阶段结构的种群中，这个世代时间可以根据稳定种群增长对繁殖力的弹性来计算，并且它等同于世代时间的另一个常用衡量指标：繁殖价值加权后代的平均亲本年龄。在这里，我们展示三件事。第一，当环境波动时，沿着遗传谱系的两次补充事件之间的平均距离是根据随机增长率对繁殖力的弹性来计算的。第二，在环境随机性下，这个世代时间的衡量指标仍然等同于繁殖价值加权后代的平均亲本年龄。第三，处于波动环境中的种群的世代时间可能偏离该种群在平均环境中会有的世代时间。
