Hatching order affects offspring growth, survival and adult dominance in the joint‐laying Pukeko Porphyrio melanotus melanotus

摘要: In birds with asynchronous hatching, hatching order is an important factor in determining offspring phenotype. Many previous studies have demonstrated that later-hatched show reduced growth and survival during development. However, few followed individuals from to adulthood test whether the effects of persist into later life. Here, we explore patterns fitness-related traits Pukeko Porphyrio melanotus melanotus, a cooperatively breeding bird lives stable social groups form linear dominance hierarchies. sometimes contain two females lay eggs same nest (jointlaying). Thus, competition between nest-mates can influence relative fitness each laying female. We both single-clutch joint-clutch nests, earlier-hatched chicks grow faster survive better than brood-mates. Moreover, achieve higher ranks as adults, making this study one first find relationship adult wild birds. Finally, females, primary female hatch earlier secondary As result, may be at competitive advantage, which could implications for dynamics species.