bioRxiv preprint doi: https://doi.org/10.1101/079459; this version posted October 5, 2016. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Polyphyletic ancestry of expanding Patagonian Chinook salmon populations 2 Cristian Correa1, 2,*, and Paul Moran3 3 1 Facultad de Ciencias Forestales y Recursos Naturales, Instituto de Conservación Biodiversidad y 4 Territorio, Universidad Austral de Chile, Casilla 567, Valdivia, Chile. 5 2 Facultad de Ciencias, Instituto de Ciencias Marinas y Limnológicas, Universidad Austral de Chile, 6 Casilla 567, Valdivia, Chile. 7 3 Conservation Biology Division, Northwest Fisheries Science Center, Seattle, Washington, United 8 States of America. 9 * Author of correspondence, E-mail:
[email protected] 10 Number of words: 11 Number of tables: 1 12 Number of figures: 3 13 Supplementary Information: 3 tables, 4 figures 1 of 42 bioRxiv preprint doi: https://doi.org/10.1101/079459; this version posted October 5, 2016. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 14 Abstract 15 Chinook salmon native to North America are spreading through South America’s Patagonia and have 16 become the most widespread anadromous salmon invasion ever documented. To better understand the 17 colonization history and role that genetic diversity might have played in the founding and radiation of 18 these new populations, we characterized ancestry and genetic diversity across latitude (39-48°S). 19 Samples from four distant basins in Chile were genotyped for 13 microsatellite loci, and allocated, 20 through probabilistic mixture models, to 148 potential donor populations in North America 21 representing 46 distinct genetic lineages.