Population genetic structure and colonisation of the Western Antarctic Peninsula by the 2 seabird tick Ixodes uriae . 4 McCoy, K.D. 1*, P. Beis 1, A. Barbosa 2, 7 , J.J. Cuervo 2,7 , W.R. Fraser 3, J. Gonzalez-Solis 4, E. Jourdain 5,8 , M. Poisbleau 6, P. Quillfeldt 6, E. Leger 1, M. Dietrich 1 6 1 Maladies Infectieuses et Vecteurs : Ecologie, Génétique, Evolution et Contrôle, UMR 8 UM1 UM2 CNRS 5290 - UR IRD 224, Centre IRD, 34394 Montpellier, France 2 Dept. Ecología Funcional y Evolutiva, Estación Experimental de Zonas Áridas, CSIC, 10 04120 Almería, Spain 3 Polar Oceans Research Group, Sheridan, Montana, 59749 USA 12 4 Insitut de Recerca de la Biodiversidad (IRBio) and Dept. Biologia Animal, Universitat de Barcelona, Barcelona 08028, Spain 14 5 Zoonotic Ecology and Epidemiology, Linnaeus University Kalmar, Sweden 6 Max Planck Institute for Ornithology, Vogelwarte Radolfzell, Radolfzell, Germany 16 7 Present address: Dept. Ecología Evolutiva, Museo Nacional de Ciencias Naturales, CSIC, 28006 Madrid, Spain 18 8 Present address: INRA, UR346, Saint Genès Champanelle, France 20 *Correspondance: Karen D. McCoy,
[email protected] Maladies Infectieuses et Vecteurs : Ecologie, Génétique, Evolution et 22 Contrôle, UMR UM1 UM2 CNRS 5290 - UR IRD 224, Centre IRD, 911 Avenue Agropolis, BP 64501, 34394 Montpellier, France 24 Running head : Tick colonisation of the Antarctic Peninsula 1 26 Abstract : Recent observations on the western Antarctic Peninsula have suggested that more 28 favourable climatic conditions may be increasing pressure on breeding seabirds due to higher exploitation rates by the tick, Ixodes uriae . Using data from eight microsatellite 30 markers and ticks from six Pygoscelis colonies, we employed a population genetics approach to specifically test the hypothesis that I.