Heat tolerance of marine ectotherms in a warming Antarctica

• Main Authors: Rezende, Enrico, Molina, Andres, Pulgar, José, Carter, Mauricio
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2022
• Subjects: heat tolerance; thermal tolerance limits; critical thermal limits; Heat stress; temperature mortality; thermal death time curves; Antarctica; Antarctic; The Antarctic; Inach; Antarc*
• Online Access: https://doi.org/10.5061/dryad.zgmsbccfk

Global warming is affecting the Antarctic continent in complex ways. Because Antarctic organisms are specialized to living in the cold, they are vulnerable to increasing temperatures, though quantitative analyses of this issue are currently lacking. Here we compiled a total of 184 estimates of heat tolerance belonging to 39 marine species and quantified how survival is affected concomitantly by the intensity and duration of a thermal stress. Species exhibit thermal limits displaced towards colder temperatures, with contrasting strategies between arthropods and fish that exhibit low tolerance to acute heat challenges, and brachiopods, echinoderms and molluscs that tend to be more sensitive to chronic exposure. These differences might be associated with mobility. A dynamic mortality model suggests that Antarctic organisms already encounter temperatures that might be physiologically stressful and indicate that these ecological communities are indeed vulnerable to ongoing rising temperatures. All analyses were performed with open source R ( https://cran.r-project.org/ ) Funding provided by: Fondo Nacional de Desarrollo Científico y Tecnológico Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100002850 Award Number: FONDECYT 1211113 Funding provided by: Fondo Nacional de Desarrollo Científico y Tecnológico Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100002850 Award Number: FONDECYT 1200813 Funding provided by: Institut chilien de l'Antarctique Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100015634 Award Number: INACH RT_09-18