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Neutral and adaptive loci reveal fine-scale population structure in Eleginops maclovinus from North Patagonia
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  • Cristian Canales-Aguirre,
  • Wes Larson,
  • Garrett McKinney,
  • C. Eliza Claure,
  • J. Dellis Rocha,
  • Santiago Ceballos,
  • Maria Cadiz,
  • Jose Yanez,
  • Daniel Gomez-Uchida
Cristian Canales-Aguirre
Universidad de Los Lagos
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Wes Larson
U.S. Geological Survey, Wisconsin Cooperative Fisheries Research Unit
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Garrett McKinney
Washington Department of Fish and Wildlife
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C. Eliza Claure
Universidad de Los Lagos Centro i-mar
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J. Dellis Rocha
Universidad de Los Lagos Centro i-mar
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Santiago Ceballos
Centro Austral de Investigaciones Científicas
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Maria Cadiz
Aarhus University
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Jose Yanez
University of Chile
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Daniel Gomez-Uchida
Universidad de Concepcion Facultad de Ciencias Naturales y Oceanograficas
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Abstract

Patagonia is an understudied area, especially when it comes to population genomic studies with relevance to fishery management. However, the dynamic and heterogeneous landscape in this area can harbor important but cryptic genetic population structure. Once such information is revealed, it can be integrated into the management of infrequently investigated species. Eleginops maclovinus is a protandrous hermaphrodite species with economic importance for local communities that is currently managed as a single genetic unit. In this study, we sampled five locations distributed across a salinity cline from Northern Patagonia to investigate the genetic population structure of E. maclovinus. We use Restriction-site Associated DNA (RAD) sequencing and outlier tests to obtain neutral and adaptive loci, using FST and GEA approaches. We identified a spatial pattern of structuration with gene flow and spatial selection by environmental association. Neutral and adaptive loci showed two and three genetic groups, respectively. The effective population sizes estimated ranged from 572 (Chepu) to 14,454 (Chaitén) and were influenced more by locality than salinity cline. We found loci putatively associated with salinity suggesting that salinity may act as a selective driver in E. maclovinus populations. These results suggest a complex interaction between genetic drift, geneflow, and natural selection in this area. Our findings suggest several units in this area, and the information should be integrated into the management of this species. We discuss the significance of these results for fishery management and suggest future directions to improve our understanding of how E. maclovinus is adapted to the dynamic waters of Northern Patagonia.
07 Jan 2022Submission Checks Completed
07 Jan 2022Assigned to Editor
19 Aug 2022Submitted to Ecology and Evolution
24 Aug 2022Review(s) Completed, Editorial Evaluation Pending
30 Aug 2022Editorial Decision: Revise Minor
05 Sep 20221st Revision Received
06 Sep 2022Submission Checks Completed
06 Sep 2022Assigned to Editor
06 Sep 2022Review(s) Completed, Editorial Evaluation Pending
06 Sep 2022Editorial Decision: Accept