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Young-of-the-year Coho Salmon Oncorhynchus kisutch recruit in fresh waters of remote Patagonian fjords in southern Chile (51°S)

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Abstract

Salmonid invasions are currently recognized as one of the main threats to the conservation of freshwater ecosystems in Patagonia. Although a number of salmonid species have been introduced to Patagonia over the last century not all species have succeeded at establishing widespread and large populations. To date, there are no reports of established self-sustaining Coho Salmon (Oncorhynchus kisutch) populations in southern Chile despite propagule pressure from aquaculture. Here, we assessed the natal origin of young-of-the-year Coho Salmon collected from estuaries and lakes associated with remote Patagonian fjords (51°S) by examining their otolith microchemical composition. Low strontium concentrations along a line transect from the otolith edge to its core in fish collected in one lake are consistent with freshwater residence until the moment of capture. Fish caught in estuaries displayed instead, relatively high strontium concentrations only at the otolith edge. This pattern suggests very recent movement from freshwater down to the estuary. Our findings are consistent with the hypothesis that the juvenile Coho Salmon collected in estuaries originated in the local freshwater system (lake) and provide the first ever evidence of recruitment and probable establishment of self-sustaining Coho Salmon population in Patagonia.

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Fig. 1

Data obtained from Servicio Nacional de Pesca y Acuicultura (Chile; http://www.sernapesca.cl)

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Acknowledgements

We thank CONAF, especially Jovito Gonzalez and the crew of the Yepayek (Captains Guillermo Igor and Germán Coronado and Machinist Victor Muñoz) for their assistance in the field. Funding for this study was provided by CONICYT Chile Grant to KG (Project REDES 140187). Financial support for the fieldwork was provided by a Grant to DER from the Committee for Research and Exploration of the National Geographic Society (Grant # 9247-13).

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Authors and Affiliations

  1. Departamento de Ecología, Facultad de Ciencias y Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile

    Konrad Górski

  2. Departamento de Sistemas Acuáticos, Facultad de Ciencias Ambientales y Centro EULA – Chile, Universidad de Concepción, Barrio Universitario S/N, Concepción, Chile

    Konrad Górski, Jorge F. González & Evelyn M. Habit

  3. Department of Zoology, University of Otago, Dunedin, New Zealand

    Aurélien Vivancos

  4. Department of Biology, Dalhousie University, Halifax, NS, B3H 4R2, Canada

    Daniel E. Ruzzante

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  1. Konrad Górski
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  2. Jorge F. González
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  3. Aurélien Vivancos
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  4. Evelyn M. Habit
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  5. Daniel E. Ruzzante
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Correspondence to Konrad Górski.

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Górski, K., González, J.F., Vivancos, A. et al. Young-of-the-year Coho Salmon Oncorhynchus kisutch recruit in fresh waters of remote Patagonian fjords in southern Chile (51°S). Biol Invasions 19, 1127–1136 (2017). https://doi.org/10.1007/s10530-016-1341-9

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