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Thermal responses of two sub-Antarctic notothenioid fishes, the black southern cod Patagonotothen tessellata (Richardson, 1845) and the Magellan plunderfish Harpagifer bispinis (Forster, 1801), from southern South America

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Abstract

The Notothenioidei are a typical example of stenothermal fishes since most species have evolved and lived in Antarctic waters, where the water temperature is low and stable. This fact enabled them to evolve physiological characteristics related to cold. Nevertheless, some species came out of Antarctic waters a few million years ago and coped with more variable thermal regimes. This work aims to determine the thermal tolerance and preference of two sub-Antarctic notothenioid species found in Southern South America, Patagonotothen tessellata and Harpagifer bispinis, adding valuable information about thermal adaptation mechanisms. Experiments were conducted after exposing their juveniles for three weeks at 4, 7, 10 and 12 °C. Their thermal tolerance limits were established using the Critical Thermal Methodology and their acute thermal preferenda, employing a horizontal thermal gradient tank. Fishes acclimated to different exposure temperatures had small to intermediate thermal tolerance polygons (P. tessellata: 593.85°C2, H. bispinis: 475.40 °C2) and positive relationships between preferred and acclimation temperatures. The Final Temperature Preferenda were estimated to be 14.25 °C for P. tessellata and 13.05 °C for H. bispinis, allowing to characterize them as cold eurythermal species, with P. tessellata more tolerant to heat and H. bispinis more tolerant to cold. Their different thermal sensitivities are in agreement with their different thermal histories and distributions. In a climate change context, the increase of sea surface temperatures is likely to reduce the northern boundaries of their distributions. Conversely, it can potentially enhance both species’ performances at their southernmost distribution limits since those environments are cooler than their maximum thermal tolerances.

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Acknowledgements

We are grateful to D. Aureliano, S. Rimbau, C. Fraysse and M. Rubel to assist in field works and technical support at the laboratory. We also acknowledge Dr. F.J. Sola and Dr. A. Patino-Douce for their assistance with the English language editing of the manuscript. We acknowledge G. N. Somero and two anonymous reviewers for their advice to improve this manuscript.

Funding

This work was funded by the Consejo Nacional de Investigaciones Científicas y Técnicas (Grant Numbers PIP 0440, and PUE 2016—CADIC) and it contributes to the ERANet-LAC program CLIMAR “Climate-driven Changes in the Habitat Suitability of Marine Organisms” (ELAC2015/T01-0495).

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Contributions

Conceptualization: E. M. Giménez; M. E. Lattuca; Investigation: E. M. Giménez, M. E. Barrantes, M. E. Lattuca; Formal analysis: E. M. Giménez, M. E. Lattuca; Writing - Original draft preparation: E. M. Giménez; Writing - reviewing and editing the original draft: M. E. Barrantes, M. E. Lattuca, D. A. Fernández; Funding acquisition and Project Administration: D. A. Fernández.

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Correspondence to Eloísa Mariana Giménez.

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The authors declare that they have no conflicts of interest.

Ethical approval

Sampling protocols and experiments on P. tessellata and H. bispinis were approved by the Ethics Committee of Austral Center for Scientific Research (CIB – CADIC).

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Giménez, E.M., Barrantes, M.E., Fernández, D.A. et al. Thermal responses of two sub-Antarctic notothenioid fishes, the black southern cod Patagonotothen tessellata (Richardson, 1845) and the Magellan plunderfish Harpagifer bispinis (Forster, 1801), from southern South America. Polar Biol 44, 1055–1067 (2021). https://doi.org/10.1007/s00300-021-02852-1

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  • DOI: https://doi.org/10.1007/s00300-021-02852-1

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