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:
影响因子:
--
通讯作者:
Coulson T
中科院分区:
文献类型:
--
作者:
Ozgul A;Tuljapurkar S;Benton TG;Pemberton JM;Clutton-Brock TH;Coulson T
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.
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