Heritability of morphological traits in Darwin's Finches: misidentified paternity and maternal effects
Heritability of morphological traits in Darwin's Finches: misidentified paternity and maternal effects
复制标题
DOI：
10.1046/j.1365-2540.2001.00900.x
复制
发表时间：
2001-09-01
期刊：
影响因子：
3.8
通讯作者：
Petren, K
中科院分区：
文献类型：
--
作者：
Keller, LF;Grant, PR;Petren, K
本研究以加拉帕戈斯群岛达芙妮岛中地雀（Geospiza fortis）为研究对象，研究了多对父权对其形态性状遗传力估计的影响。来自8个微卫星基因座的数据用于亲子鉴定。测量到的每只雀的6个形态特征由两个独立的主成分分析来表示，一个用于三个喙的测量，一个用于体型的测量。遗传力的计算采用加权回归法，对后代的父母和后代的祖父母进行加权回归。我们发现20%的后代都是额外的一对，但所有的后代都和他们的母亲匹配。中亲代回归的遗传力均较高，且与零有显著差异。从数据集中删除所有额外的年轻对，父系后代的回归平均提高了21%，但母系后代的相似性仍然比父系后代的相似性高出42%。这些结果和祖父母-后代回归为母系效应提供了证据，其量级与其他野生鸟类研究报告相当。
We studied the influence of extra-pair paternity on heritability estimates of morphological traits in a population of the Medium Ground Finch (Geospiza fortis) on Isla Daphne Major, Galapagos. Data from eight microsatellite loci were used to determine parentage. Six morphological traits measured on each finch were represented by two separate principal components analyses, one for the three bill measurements and one for the body size measurements. Heritabilities were calculated using weighted regressions of offspring on their parents and also offspring on their grandparents. We found that 20% of all offspring were extra-pair young but all offspring matched their mothers. Heritabilities derived from midparent-offspring regressions were all high and significantly different from zero. Removing all extra-pair young from the data set increased father-offspring regressions by an average of 21%, but mother-offspring resemblance still exceeded father-offspring resemblance by up to 42%. These results and grandparent-offspring regressions provide evidence for maternal effects, comparable in magnitude to those reported in other studies of wild birds.