The dynamics of phenotypic change and the shrinking sheep of St. Kilda.

The dynamics of phenotypic change and the shrinking sheep of St. Kilda.
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DOI:
10.1126/science.1173668
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发表时间:
2009-07-24
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Coulson T
Coulson T
中科院分区:
其他
文献类型:
--
作者:
Ozgul A;Tuljapurkar S;Benton TG;Pemberton JM;Clutton-Brock TH;Coulson T

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环境变化,包括气候变化,可以通过生态和进化过程引起快速的表型变化。由于生态和进化动力学密切相关,因此一个主要挑战是确定它们的相对作用。我们将自由生活的索伊羊群体的平均体重变化准确地分解为促成变化的所有过程。生态过程贡献最大,而选择——适应性进化的基础——对观察到的表型趋势几乎没有解释。我们的研究结果使我们能够解释为什么尽管体重是可遗传的,选择却没有实现,以及为什么环境变化导致了索伊羊体型的下降。
Environmental change, including climate change, can cause rapid phenotypic change via both ecological and evolutionary processes. Because ecological and evolutionary dynamics are intimately linked, a major challenge is to identify their relative roles. We exactly decompose change in mean body weight in a free-living population of Soay sheep into all processes that contribute to change. Ecological processes contribute most, with selection – the underpinning of adaptive evolution – explaining little of the observed phenotypic trend. Our results enable us to explain why selection is not realized even though weight is heritable and why environmental change has caused a decline in Soay sheep body size.
DOI: 10.1111/j.1558-5646.1983.tb00236.x
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