title: Genomic patterns of diversity and divergence of two introduced salmonid species in Patagonia, South America.
abstract: Invasive species have become widespread in aquatic environments throughout the world, yet there are few studies that have examined genomic variation of multiple introduced species in newly colonized environments. In this study, we contrast genomic variation in two salmonid species (anadromous Chinook Salmon,Oncorhynchus tshawytscha, 11,579 SNPs and resident Brook CharrSalvelinus fontinalis, 13,522 SNPs) with differing invasion success after introduction to new environments in South America relative to populations from their native range in North America. Estimates of genetic diversity were not significantly different between introduced and source populations for either species, indicative of propagule pressure that has been shown to maintain diversity in founding populations relative to their native range. Introduced populations also demonstrated higher connectivity and gene flow than those in their native range. Evidence for candidate loci under divergent selection was observed, but was limited to specific introduced populations and was not widely evident. Patterns of genomic variation were consistent with general dispersal potential of each species and therefore also the notion that life history variation may contribute to both invasion success and subsequent genetic structure of these two salmonids in Patagonia.
authors.affiliation: Hagerman Fish Culture Experiment Station Columbia River Inter-Tribal Fish Commission Hagerman ID USA.
authors.forename: Shawn R
authors.identifier: 0000-0002-7470-7485
authors.initials: SR
authors.lastname: Narum
authors.affiliation: Centro de Cultivos Marinos Bahía Laredo University of Magallanes Punta Arenas Chile.
authors.forename: Pablo
authors.initials: P
authors.lastname: Gallardo
authors.affiliation: Facultad de Ciencias Forestales y Recursos Naturales Instituto de Conservación Biodiversidad y Territorio Universidad Austral de Chile Valdivia Chile; Facultad de Ciencias Instituto de Ciencias Marinas y Limnológicas Universidad Austral de Chile Valdivia Chile.
authors.forename: Cristian
authors.initials: C
authors.lastname: Correa
authors.affiliation: Hagerman Fish Culture Experiment Station Columbia River Inter-Tribal Fish Commission Hagerman ID USA.
authors.forename: Amanda
authors.initials: A
authors.lastname: Matala
authors.affiliation: Hagerman Fish Culture Experiment Station Columbia River Inter-Tribal Fish Commission Hagerman ID USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Hasselman
authors.affiliation: Institut de Biologie Intégrative et des Systèmes (IBIS) Université Laval Québec QC Canada.
authors.forename: Ben J G
authors.initials: BJ
authors.lastname: Sutherland
authors.affiliation: Institut de Biologie Intégrative et des Systèmes (IBIS) Université Laval Québec QC Canada.
authors.forename: Louis
authors.initials: L
authors.lastname: Bernatchez
keywords: RAD‐seq; adaptation; genomics; invasive species; salmonids