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Variable responses to chronic and acute elevated temperature of three coral species from reefs with distinct thermal regimes

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Abstract

Ocean warming and marine heatwaves caused by climate change are adversely affecting the health, structure, and function of coral reefs globally. As seawater temperature continues to rise, and with the intensity and duration of heat stress events expected to increase, it is pertinent to understand the environmental drivers of variability in coral thermal tolerance under both chronic and acute warming. We assessed the performance of three species of corals, Acropora nana, Pocillopora acuta, and Porites lutea, sourced from reefs with distinct thermal regimes (variable vs. stable) in southern Taiwan, when exposed to chronic long-term temperature conditions (12 weeks at 26 °C or 30 °C) and then, using a subset of corals, subsequently exposed to acute short-term elevated temperature conditions (8 days at 32 °C). Under chronic temperature exposure we found clear species-specific responses, and some differences between reef sites and temperature treatments. Despite being perceived as relatively thermally sensitive, A. nana had the most stable maximum quantum yield (Fv/Fm), consistent growth, and the highest survival among the study species. Survival of P. acuta under chronic warming showed the clearest reef site effect and was lower in coral nubbins sourced from the thermally stable reef than the thermally variable reef. Porites lutea showed the greatest decline in Fv/Fm and lowest overall growth under chronic temperature exposure. All coral species, regardless of source reef site or previous chronic temperature exposure, experienced substantial bleaching (50–100% of all nubbins) upon acute exposure to elevated temperature. We found that, overall, corals were able to tolerate chronic warming above seasonal mean temperatures, but that bleaching occurred after acute exposure to a temperature ~ 2 °C above their mean summer maxima.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author upon request.

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Acknowledgements

Thank you to Jing-Ya Yan for undertaking the water chemistry measurements and Jie-Wei for dive assistance. Also, thank you to two anonymous reviewers for their valuable feedback and comments.

Funding

This study was funded by a grant awarded to Tung-Yung Fan by the Taiwan Ministry of Science and Technology (MOST 107–2611-M-291–004). The authors have no financial or proprietary interests in any material discussed in this article.

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Contributions

Conception and design of this study was formulated by Crystal J. McRae, Tung-Yung Fan, and Wen-Bin Huang. Material preparation, colony collection, and nubbin fragmentation was done by Crystal J. McRae, Shashank Keshavmurthy, Sabrina L. Rosset, and Chaolun Allen Chen. Data analysis was performed by Crystal J. McRae with feedback and contributions from Isabelle M. Côté, and water chemistry analysis was undertaken by Pei-Jie Meng. The manuscript was written by Crystal J. McRae and Isabelle M. Côté, and benefited from feedback from all authors. All authors have read and approved this manuscript for submission.

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Correspondence to Tung-Yung Fan.

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The authors declare no conflict of interest.

Ethical approval

We declare that all national and institutional guidelines for sampling, care and experimental use of organisms for the study have been followed, and that all necessary approvals have been obtained. Corals were collected with permission from the Kenting National Park (permit #: 10703044800).

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Responsible Editor: C. Voolstra.

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McRae, C.J., Keshavmurthy, S., Meng, PJ. et al. Variable responses to chronic and acute elevated temperature of three coral species from reefs with distinct thermal regimes. Mar Biol 169, 97 (2022). https://doi.org/10.1007/s00227-022-04071-6

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  • DOI: https://doi.org/10.1007/s00227-022-04071-6

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