Data for: Cooperative partnerships of the azure-winged magpie shift from kin to non-kin during colonization of the Tibetan Plateau

Cooperative breeding (CB) has recently become hot research topic in the field of evolution of animal behavior. However, while CB-related factors have been identified at the species and individual level separately, few studies have used both large- and fine-scale effects to demonstrate CB-related tradeoffs. Here, we propose a “resource gain-fitness loss” model that addresses this question and applied it to the Tibetan azure-winged magpie during their colonization of a high-altitude (i.e., harsh) habitat. We found that CB occurrence decreased with time after colonization and during the breeding season. The decrease coincided with increasing nest security as the threat of predation decreased. Along the same timeline, the relatedness of helpers to the opposite-sexed breeder shifted from kin to non-kin. Cooperative breeders allocated parentage among their social mate, helpers, and outgroup extra-pair mates, with extra-pair mates obtaining larger reproductive shares over time during colonizat..., We collected the life history data of the azure-winged magpie the field on the Tibetan Plateau. The data about parentage analysis were collected in the labotory. All the data have been processed according to their characteristics.,