Price Trevor
Department of Biology C-016, University of California at San Diego, 92093, La Jolla, CA, USA.
Oecologia. 1991 May;86(4):535-541. doi: 10.1007/BF00318320.
I investigated genetic and environmental factors affecting fledgling chick size in the Yellow browed leaf warbler Phylloscopus inornatus. The proportion of variation among broods is >45% for both tarsus length and body weight; this can be attributed at least in part to effects of the shared nest environment. A high off-spring-parent regression for weight also appears to be partly due to an environmentally induced correlation and the regression is reduced when effects of laying date are controlled for. A cross-fostering experiment demonstrated a significant nest of origin x nest of rearing interaction. The presence of genotype-environment interaction affecting chick size may be quite general in birds. It is shown how this can account for observed patterns of the dependence of the magnitude of offspringparent regression on prevailing conditions, as has been found in other studies. In P. inornatus the failure to detect significant genetic variance in chick body weight and tarsus length may be due to high standard errors on the estimates, but it may also reflect true low levels of genetic variance in chick size if the genotype-interaction effect described occurs regularly in this species.
我研究了影响黄眉柳莺雏鸟体型大小的遗传和环境因素。跗跖长度和体重在窝间的变异比例均超过45%；这至少部分可归因于共享巢环境的影响。体重的高亲子回归似乎也部分归因于环境诱导的相关性，并且在控制产卵日期的影响后，回归系数会降低。一项交叉寄养实验表明，雏鸟的出生巢与育雏巢之间存在显著的交互作用。影响雏鸟体型大小的基因型-环境相互作用在鸟类中可能相当普遍。研究表明，这可以解释其他研究中观察到的后代-亲代回归系数大小对环境条件的依赖性模式。在黄眉柳莺中，未能检测到雏鸟体重和跗跖长度的显著遗传方差，可能是由于估计值的标准误差较高，但如果该物种中经常出现上述基因型-环境相互作用效应，这也可能反映出雏鸟体型大小的遗传方差确实较低。
