Severe inbreeding depression in collared flycatchers (Ficedula albicollis)

被引:148
作者
Kruuk, LEB
Sheldon, BC
Merilä, J
机构
[1] Univ Edinburgh, Inst Cell Anim & Populat Biol, Edinburgh EH9 3JT, Midlothian, Scotland
[2] Univ Oxford, Dept Zool, Oxford OX1 3PS, England
[3] Uppsala Univ, Evolutionary Biol Ctr, Dept Anim Ecol, SE-75236 Uppsala, Sweden
[4] Uppsala Univ, Evolutionary Biol Ctr, Dept Populat Biol, SE-75236 Uppsala, Sweden
[5] Univ Helsinki, Dept Ecol & Systemat, Div Populat Biol, Bioctr 3, FIN-00014 Helsinki, Finland
关键词
Ficedula; genetic load; inbreeding avoidance; lethal equivalents; dominance variance; mate choice;
D O I
10.1098/rspb.2002.2049
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The causes and magnitude of inbreeding depression are of considerable importance for a wide range of issues in evolutionary and conservation biology, but we have only a limited understanding of inbreeding depression in natural populations. Here, we present a study of inbreeding in a large wild population of collared flycatchers (Ficedula albicollis). Inbreeding was rare, to the extent that we detected only 1.04% of 2139 matings over 18 years that resulted in offspring with a non-zero inbreeding coefficient, f > 0. When it did occur, inbreeding caused a significant reduction in the egg-hatching rate, in fledgling skeletal size and in post-fledging juvenile survival, with the number of offspring being recruited to the breeding population from a nest of f = 0.25 being reduced by 94% relative to a non-inbred nest. A maximum-likelihood estimate of the number of lethal equivalents per gamete was very high at B = 7.47, indicating a substantial genetic load in this population. There was also a non-significant tendency for inbreeding depression to increase with the strength of selection on a trait. The probability of mating between close relatives (f = 0.25) increased throughout the breeding season, possibly reflecting increased costs of inbreeding avoidance. Our results illustrate how severe inbreeding depression and considerable genetic load may exist in natural populations, but detecting them may require extensive long-term datasets.
引用
收藏
页码:1581 / 1589
页数:9
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