Lifetime reproductive success in relation to morphology in the house sparrowPasser domesticus

Abstract

SummaryIn this study we relate variation in lifetime reproductive success (LRS) of male and female house sparrowsPasser domesticusto morphological characteristics.Our analyses demonstrated no sex‐specific difference in the distribution ofLRS. The variance inLRSwas influenced mainly by variation in individual annual reproductive success, and to a lesser extent by variation in individual lifespan.Phenotypic traits explained a significant proportion of the variation inLRSin males, but not in females. The effect of male morphology onLRSoperated mainly through an effect on the number of recruiting daughters.The size of the patch of black feathers on the chest of males (badge size) and male bill length were both positively associated withLRS. Lifespan and bill length were positively related and reproductive success increased with badge size. In females, number of recruiting daughters was positively related to bill length, body mass and body condition index due to the positive effect of these traits on annual production of daughters.These results indicate that identifying factors causing the large individual variation inLRS, which is likely to be closely related to fitness, will be important to understand microevolutionary processes in this metapopulation, and hence their demographic feedbacks.