Responses of pink salmon to CO2-induced aquatic acidification

Michelle Ou (), Trevor J. Hamilton, Junho Eom, Emily M. Lyall, Joshua Gallup, Amy Jiang, Jason Lee, David A. Close, Sang-Seon Yun and Colin J. Brauner ()
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Michelle Ou: University of British Columbia
Trevor J. Hamilton: MacEwan University
Junho Eom: University of British Columbia
Emily M. Lyall: University of British Columbia
Joshua Gallup: MacEwan University
Amy Jiang: University of British Columbia
Jason Lee: University of British Columbia
David A. Close: University of British Columbia
Sang-Seon Yun: Fisheries Centre, University of British Columbia
Colin J. Brauner: University of British Columbia

Nature Climate Change, 2015, vol. 5, issue 10, 950-955

Abstract: Abstract Ocean acidification negatively affects many marine species and is predicted to cause widespread changes to marine ecosystems. Similarly, freshwater ecosystems may potentially be affected by climate-change-related acidification; however, this has received far less attention. Freshwater fish represent 40% of all fishes, and salmon, which rear and spawn in freshwater, are of immense ecosystem, economical and cultural importance. In this study, we investigate the impacts of CO2-induced acidification during the development of pink salmon, in freshwater and following early seawater entry. At this critical and sensitive life stage, we show dose-dependent reductions in growth, yolk-to-tissue conversion and maximal O2 uptake capacity; as well as significant alterations in olfactory responses, anti-predator behaviour and anxiety under projected future increases in CO2 levels. These data indicate that future populations of pink salmon may be at risk without mitigation and highlight the need for further studies on the impact of CO2-induced acidification on freshwater systems.

Date: 2015
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DOI: 10.1038/nclimate2694

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