Acknowledgments
We thank the University of La Rochelle (ULR) for funding LT PHD, and the ULR and CEBC molecular core facilities for lab support. We also thank the Parc Naturel Regional de la Martinique and the DEAL Martinique for help and funding of the research program on shearwaters. Blood samples of Audubon’s shearwaters of St Barth were obtained with the agreement of Agence Territoriale de l’Environnement de Saint-Barthélémy. We are also grateful to the Direção Nacional do Ambiente of Cape Verde, the Cabildo de Lanzarote and Gobierno de Canarias of Spain, and the Direcção Regional do Ambiente from Azores of Portugal for permission and logistical support in conducting fieldwork in the respective countries and to the Spanish Government (CGL2009-11278/BOS, CGL2013-42585-P, CGL2016-78530-R) and Fondos FEDER for funding. We warmly thank Pierre-André Crochet, Sarah Samadi and Joan Ferrer-Obiol for great comments on previous draft that very much improved our manuscript.