Phenotypic selection on a heritable size trait revisited

被引:126
作者
Kruuk, LEB
Merilä, J
Sheldon, BC
机构
[1] Univ Edinburgh, Inst Cell Anim & Populat Biol, Edinburgh EH9 3JT, Midlothian, Scotland
[2] Uppsala Univ, Dept Populat Biol, Evolutionary Biol Ctr, SE-75236 Uppsala, Sweden
[3] Univ Oxford, Dept Zool, Oxford OX1 3PS, England
[4] Uppsala Univ, Ctr Evolutionary Biol, Dept Anim Ecol, SE-75236 Uppsala, Sweden
关键词
natural selection; additive genetic variance; BLUP breeding values; Ficedula albicollis; tarsus length;
D O I
10.1086/323585
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
One of evolutionary biology's most persistent puzzles is the fact that apparent directional selection on a heritable trait in a natural population often does not produce a selection response. We tested three possible explanations for this problem using data on body size of more than 23,000 individuals, measured over 18 yr, in a collared flycatcher (Ficedula albicollis) population. Using a restricted maximum likelihood "animal model," we found a narrow-sense heritability for fledgling tarsus length of S0.35 +/- 0.02 E and substantial common environment effects (0.30 +/- 0.01 SE). For survival to adulthood hood, the selection differential on tarsus length was 0.18 +/- 0.02 SE. There was, however, no response to this selection over the study period. One explanation for the lack of response might have been that selection was associated with only the environmental (nonheritable) component of phenotype, but we found significant selection on breeding values (the heritable component). There was also no evidence of fluctuating selection pressures or of antagonistic selection between the sexes in selection pressures. Thus, in contrast to earlier investigations in this same population, none of the potential explanations for the absence of a selection response was supported; we discuss alternative hypotheses yet to be investigated.
引用
收藏
页码:557 / 571
页数:15
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