Contemporary distribution of non-native Chinook salmon (Oncorhynchus tshawytscha) in South America

Guillermo Figueroa-Munoz; J. Andres Olivos; Ivan Arismendi; Graciela Fabiano; Martin Laporta; Santiago Silveira; Ivan González-Bergonzoni; Guido Pavez; Billy Ernst; Javier E. Ciancio; Chris Harrod; Cecilia Y. Di Prinzio; Tomás Chalde; Christina Amy Murphy; Daniel Gomez-Uchida

doi:10.1007/s10530-023-03083-7

Contemporary distribution of non-native Chinook salmon (Oncorhynchus tshawytscha) in South America

Biological Invasions

By: Guillermo Figueroa-Munoz, J. Andres Olivos, Ivan Arismendi, Graciela Fabiano, Martin Laporta, Santiago Silveira, Ivan González-Bergonzoni, Guido Pavez, Billy Ernst, Javier E. Ciancio, Chris Harrod, Cecilia Y. Di Prinzio, Tomás Chalde, Christina Amy Murphy, and Daniel Gomez-Uchida

https://doi.org/10.1007/s10530-023-03083-7

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Abstract

Chinook salmon represent one of the most successful salmonid introductions in South America, and today multiple naturalized populations exist across Patagonia. Here, we present an updated regional distribution of Chinook salmon that includes new records of occurrences collected between 2006 and 2022. We found a significant range expansion in terms of occurrences for adult (18 new basins; 2,854,108 km²) and adult spawners or juvenile (12 new basins; 53,262 km²) salmon extending both to the north and south of the previously known colonized range in South America. This range expansion (38% of the area considering only occurrences indicating reproduction via adult spawners or juvenile salmon) included major basins draining to both the Pacific Ocean and Atlantic Ocean coasts of the continent. Adult Chinook salmon are currently reported from 48 large basins (33.62°–54.97° S) covering a total drainage area of 3,047,197 km². The observed expansion we document here has been likely driven by the dispersal of straying adults from historically naturalized populations. Our findings provide evidence that the invasion of Chinook salmon in South America is ongoing and updated information relevant to the management of this invasive and socio-ecologically important fish.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Contemporary distribution of non-native Chinook salmon (Oncorhynchus tshawytscha) in South America
Series title	Biological Invasions
DOI	10.1007/s10530-023-03083-7
Volume	25
Publication Date	May 20, 2023
Year Published	2023
Language	English
Publisher	Springer Nature
Contributing office(s)	Coop Res Unit Leetown
Description	9 p.
First page	2727
Last page	2735
Other Geospatial	South America