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Thermal limits of survival and reproduction depend on stress duration: a case study of Drosophila suzukii
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  • Michael Ørsted,
  • Quentin Willot,
  • Andreas Olsen,
  • Viktor Kongsgaard,
  • Johannes Overgaard
Michael Ørsted
Aalborg University

Corresponding Author:[email protected]

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Quentin Willot
Aarhus Universitet
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Andreas Olsen
Aarhus Universitet
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Viktor Kongsgaard
Aarhus Universitet
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Johannes Overgaard
Aarhus Universitet
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Studies of ectotherm responses to heat extremes often rely on assessing absolute critical limits for heat coma or death (CTmax), however, such single parameter metrics ignores the importance of stress exposure duration. Furthermore, population persistence may be affected at temperatures considerably below CTmax through decreased reproductive output. Here we investigate the relationship between tolerance duration and severity of heat stress across four ecologically relevant life-history traits (productivity, sterility, coma, and mortality) using the global agricultural pest Drosophila suzukii. For the first time, we show that for sublethal reproductive traits, tolerance duration decreases rapidly and exponentially with increasing temperature (R2>0.97), thereby extending the Thermal Death Time framework recently developed for mortality and coma. Using field micro-environmental temperatures, we show how thermal stress can lead to considerable reproductive loss at temperatures with limited heat mortality highlighting the importance of including limits to reproductive performance in ecological studies of heat stress vulnerability.
08 Sep 2023Submitted to Ecology Letters
13 Sep 2023Submission Checks Completed
13 Sep 2023Assigned to Editor
13 Sep 2023Review(s) Completed, Editorial Evaluation Pending
14 Sep 2023Reviewer(s) Assigned
14 Oct 2023Editorial Decision: Revise Major
13 Nov 20231st Revision Received
13 Nov 2023Review(s) Completed, Editorial Evaluation Pending
14 Nov 2023Submission Checks Completed
14 Nov 2023Assigned to Editor
14 Nov 2023Reviewer(s) Assigned