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Measuring critical thermal maximum in aquatic ectotherms: A practical guide.

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Title: Measuring critical thermal maximum in aquatic ectotherms: A practical guide.
Authors: Raby, Graham D., Morgan, Rachael, Andreassen, Anna H., Stewart, Erin M. C., De Bonville, Jeremy, Hoots, Elizabeth C., Kuchenmüller, Luis, Metz, Moa, Rowsey, Lauren E., Green, Leon, Griffin, Robert A., Martin, Sidney, Reid, Heather Bauer, Ern, Rasmus, Åsheim, Eirik Ryvoll, Cowan, Zara‐Louise, Leeuwis, Robine H. J., Blewett, Tamzin A., Speers‐Roesch, Ben, Clark, Timothy D.
Source: Methods in Ecology & Evolution; Oct2025, Vol. 16 Issue 10, p2208-2228, 21p
Subject Terms: EXPERIMENTAL design, PHYSIOLOGICAL effects of temperature, GLOBAL warming, SPECIFIC heat capacity, DOCUMENTATION standards, COLD-blooded animals, PHYSIOLOGY
Abstract: Critical thermal limits, commonly quantified as CTmax (maximum) or CTmin (minimum), are core metrics in the thermal biology of aquatic ectotherms. CTmax, in particular, has recently surged in popularity due to its various applications, including understanding and predicting the responses of animals to climate warming.Despite its growing popularity, there is a limited literature aimed at establishing best practices for designing, running and reporting CTmax experiments. This lack of standardisation and insufficiently detailed reporting in the literature creates challenges when designing CTmax studies or comparing results across studies.Here, we provide a comprehensive, practical guide for designing and conducting experiments to measure critical thermal limits, with an emphasis on CTmax. Our recommendations cover 12 topic areas including apparatus design, masking (blinding), warming rates, end points, replication and reporting. We include diagrams and photos for designing and building critical thermal limit arenas for field or lab applications. We also provide a reporting checklist as a reference for researchers when carrying out experiments and preparing manuscripts.Future studies incorporating critical thermal limits would benefit from transparent reporting of warming/cooling rates (raw data, supplementary graphs) and photo/video evidence showing arena designs and critical thermal limit end points. We also provide directions for empirical research that will help further inform the measurement of critical thermal limits, including biotic factors like stress and digestion, warming/cooling rates, the effects of body mass on heat transfer and the physiological mechanisms underlying thermal tolerance. [ABSTRACT FROM AUTHOR]
Copyright of Methods in Ecology & Evolution is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Critical thermal limits, commonly quantified as CTmax (maximum) or CTmin (minimum), are core metrics in the thermal biology of aquatic ectotherms. CTmax, in particular, has recently surged in popularity due to its various applications, including understanding and predicting the responses of animals to climate warming.Despite its growing popularity, there is a limited literature aimed at establishing best practices for designing, running and reporting CTmax experiments. This lack of standardisation and insufficiently detailed reporting in the literature creates challenges when designing CTmax studies or comparing results across studies.Here, we provide a comprehensive, practical guide for designing and conducting experiments to measure critical thermal limits, with an emphasis on CTmax. Our recommendations cover 12 topic areas including apparatus design, masking (blinding), warming rates, end points, replication and reporting. We include diagrams and photos for designing and building critical thermal limit arenas for field or lab applications. We also provide a reporting checklist as a reference for researchers when carrying out experiments and preparing manuscripts.Future studies incorporating critical thermal limits would benefit from transparent reporting of warming/cooling rates (raw data, supplementary graphs) and photo/video evidence showing arena designs and critical thermal limit end points. We also provide directions for empirical research that will help further inform the measurement of critical thermal limits, including biotic factors like stress and digestion, warming/cooling rates, the effects of body mass on heat transfer and the physiological mechanisms underlying thermal tolerance. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Methods in Ecology & Evolution is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/2041-210X.70103
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