查看文章

Quantifying sex-specific additive genetic variance (V A) in fitness, and the cross-sex genetic correlation (r A), is prerequisite to predicting evolutionary dynamics and the magnitude of sexual conflict. Further, quantifying V A and r A in underlying fitness components, and genetic consequences of immigration and resulting gene flow, is required to identify mechanisms that maintain V A in fitness. However, these key parameters have rarely been estimated in wild populations experiencing natural environmental variation and immigration. We used comprehensive pedigree and life-history data from song sparrows (Melospiza melodia) to estimate V A and r A in sex-specific fitness and underlying fitness components, and to estimate additive genetic effects of immigrants alongside inbreeding depression. We found evidence of substantial V A in female and male fitness, with a moderate positive cross-sex r A. There was also …