Helping in Cyanopica · Why helping others? The role of direct fitness benefits within the social-networks in cooperatively breeding azure-winged magpies

Current literature on the evolution of cooperation agrees that kin selection cannot explain the benefits accrued by cooperators in many systems. One main gap is the type of direct benefits that helpers obtain in cooperative breeding systems and how they are ESS provided that natural selection favours defectors over cooperators in unstructured populations. Recent advances show that ""social viscosity"" can maintain benefits for cooperators. Thus, the study of social-network structure can potentially explain why cooperation persists. This type of approach can only be tackled after a long-term study at individual level. I have monitored a population of cooperative breeding Azure-winged magpie (Cyanopica cooki) for more than 20 years. I have pedigree data, their reproductive behaviour in helper and breeder roles, and lifetime reproductive success for many birds. Yet, the reason why helpers contribute to rearing other birds' offspring has remained elusive. Here I will use network approach to previous data plus new monitoring of breeding groups to study: the role of kinship, by using pedigree and genetic analyses