Immigration counter-acts local micro-evolution of a major fitness component : migration-selection balance in free-living song sparrows

Acknowledgements: We thank the Tsawout and Tseycum First Nations Bands for allowing access to Mandarte, everyone who contributed to long-term data collection, NSERC (Canada), the Swiss National Science Foundation (recently P400PB-180870), the Research Council of Norway (SFF-III, project 223257) and NTNU for funding. The authors declare no conflicts of interest.Peer reviewedPublisher PD