Antler size in red deer: Heritability and selection but no evolution
Antler size in red deer: Heritability and selection but no evolution
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DOI：
10.1111/j.0014-3820.2002.tb01480.x
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发表时间：
2002-08-01
期刊：
影响因子：
3.3
通讯作者：
Clutton-Brock, T
中科院分区：
文献类型：
--
作者：
Kruuk, LEB;Slate, J;Clutton-Brock, T
我们对野生种群中雄性第二性武器的选择和遗传力进行了估计：马鹿的鹿角大小。拥有大鹿角的雄性马鹿在体型校正之前和之后都提高了终生繁殖成功率，产生了 0.44 (+/-0.18 SE) 的标准化选择梯度。尽管与年龄和环境相关的差异很大，但鹿角大小也是可遗传的（鹿角质量的遗传力= 0.33 +/- 0.12）。然而，在近 30 年的研究期间，观察到的选择并没有对鹿角大小产生进化反应，并且没有证据表明鹿角大小和健康度之间存在正向遗传相关性，也没有证据表明鹿角大小和健康度的育种值之间存在正相关性。我们的结果与这样的假设是一致的：如果测量的性状和适应性之间的关联是由环境协方差决定的，那么定向选择下的遗传性状就不会进化：例如，在雄性马鹿中，鹿角的大小和争夺配偶的成功可能在很大程度上取决于个体的营养状态。
We present estimates of the selection on and the heritability of a male secondary sexual weapon in a wild population: antler size in red deer. Male red deer with large antlers had increased lifetime breeding success, both before and after correcting for body size, generating a standardized selection gradient of 0.44 (+/-0.18 SE). Despite substantial age- and environment-related variation, antler size was also heritable (heritability of antler mass = 0.33 +/- 0.12). However the observed selection did not generate an evolutionary response in antler size over the study period of nearly 30 years, and there was no evidence of a positive genetic correlation between antler size and fitness nor of a positive association between breeding values for antler size and fitness. Our results are consistent with the hypothesis that a heritable trait under directional selection will not evolve if associations between the measured trait and fitness are determined by environmental covariances: In red deer males, for example, both antler size and success in the fights for mates may be heavily dependent on an individual's nutritional state.