Volta

Contrasting respiratory response to regulate resilience under marine heatwave intensities and onset rates

Marine heatwaves (MHW) occur at varying profiles (intensity, onset, duration) and their impact depends on species-specific thermal physiology. While physiological processes may support resilience to MHW-induced thermal stress, metabolic costs may have strong post-MHW implications. Here, by assessing respiratory response, we link metabolic costs of a model marine crustacean (copepod) to MHW profiles and determine the mechanisms involved in recovery and potential vulnerability to additional thermal stress. Our results suggest that copepods potentially used metabolic depression as a response to increased temperature, but the responses were not uniform across MHW profiles. Harsher MHW (composite higher intensity and onset rate) caused an upsurge in metabolic rate but also high metabolic rates during the recovery phase. Therefore, copepods exposed to the harsher …

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