An evolutionary tipping point in a changing environment
An evolutionary tipping point in a changing environment
复制标题
不断变化的环境中的进化转折点
DOI:
10.1111/evo.13374
复制
发表时间:
2017
期刊:
影响因子:
3.3
通讯作者:
C. Klausmeier
中科院分区:
文献类型:
--
作者:
Matthew M. Osmond;C. Klausmeier
Populations can persist in directionally changing environments by evolving. Quantitative genetic theory aims to predict critical rates of environmental change beyond which populations go extinct. Here, we point out that all current predictions effectively assume the same specific fitness function. This function causes selection on the standing genetic variance of quantitative traits to become increasingly strong as mean trait values depart from their optima. Hence, there is no bound on the rate of evolution and persistence is determined by the critical rate of environmental change at which populations cease to grow. We then show that biologically reasonable changes to the underlying fitness function can impose a qualitatively different extinction threshold. In particular, inflection points caused by weakening selection create local extrema in the strength of selection and thus in the rate of evolution. These extrema can produce evolutionary tipping points, where long‐run population growth rates drop from positive to negative values without ever crossing zero. Generic early‐warning signs of tipping points are found to have little power to detect imminent extinction, and require hard‐to‐gather data. Furthermore, we show how evolutionary tipping points produce evolutionary hysteresis, creating extinction debts.
DOI:
10.1007/978-3-0348-8882-0_12
发表时间:
1997
期刊:
EXS.
影响因子:
--
作者:
Burger,R;Lynch,M
通讯作者:
Lynch,M