Chronic exposure to environmental temperature attenuates the thermal sensitivity of salmonids

Alexia M. González-Ferreras (), Jose Barquín, Penelope S. A. Blyth, Jack Hawksley, Hugh Kinsella, Rasmus Lauridsen, Olivia F. Morris, Francisco J. Peñas, Gareth E. Thomas, Guy Woodward, Lei Zhao and Eoin J. O’Gorman
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Alexia M. González-Ferreras: IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria
Jose Barquín: IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria
Penelope S. A. Blyth: Imperial College London, Silwood Park Campus
Jack Hawksley: Imperial College London, Silwood Park Campus
Hugh Kinsella: University of Essex, Wivenhoe Park
Rasmus Lauridsen: Salmon and Trout Research Centre, East Stoke
Olivia F. Morris: Imperial College London, Silwood Park Campus
Francisco J. Peñas: IHCantabria - Instituto de Hidráulica Ambiental de la Universidad de Cantabria
Gareth E. Thomas: University of Essex, Wivenhoe Park
Guy Woodward: Imperial College London, Silwood Park Campus
Lei Zhao: China Agricultural University
Eoin J. O’Gorman: University of Essex, Wivenhoe Park

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Metabolism, the biological processing of energy and materials, scales predictably with temperature and body size. Temperature effects on metabolism are normally studied via acute exposures, which overlooks the capacity for organisms to moderate their metabolism following chronic exposure to warming. Here, we conduct respirometry assays in situ and after transplanting salmonid fish among different streams to disentangle the effects of chronic and acute thermal exposure. We find a clear temperature dependence of metabolism for the transplants, but not the in-situ assays, indicating that chronic exposure to warming can attenuate salmonid thermal sensitivity. A bioenergetic model accurately captures the presence of fish in warmer streams when accounting for chronic exposure, whereas it incorrectly predicts their local extinction with warming when incorporating the acute temperature dependence of metabolism. This highlights the need to incorporate the potential for thermal acclimation or adaptation when forecasting the consequences of global warming on ecosystems.

Date: 2023
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DOI: 10.1038/s41467-023-43478-7

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