Abstract
Clones of hermatypic coral Acropora digitifera from Sesoko Island, Okinawa, were exposed to temperatures of 29 °C, 30 °C, 31 °C, and 32 °C for 14 days in a laboratory to identify their response to high seawater temperature. Coral colour was evaluated by RGB (R, red; G, green; B, blue) values and a 6-point brightness/saturation scale coral colour reference card. The colour of A. digitifera shifted slightly toward the black end of the scale in the 29 °C and 30 °C treatments throughout the experiment. The maximum effective quantum yield (ΔF/Fm′) was stable at these temperatures treatments. By the end of the experiment at 31 °C, coral colour and ΔF/Fm′ were slightly altered in the direction of bleaching, but the coral was not bleached. This result indicates that A. digitifera can resist bleaching for at least 2 weeks at 31 °C which is 2 °C above the highest summertime seawater temperature in Okinawa. In the 32 °C treatment, while bleaching occurred approximately on day 3, the ΔF/Fm′ was reduced but increased again with fluctuations. The succession of ΔF/Fm′ after exposure to 32 °C differed from that in corals exposed to herbicides. Taken together, these results suggest that corals may keep the platform for primary production after bleaching under high temperature conditions.
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Change history
29 January 2023
The article is updated to remove the Data Availability Statement.
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Acknowledgements
The sampling of Acropora was conducted under special permission from the Okinawa Prefectural Government (No. 31–13). The support of the Motobu Fisheries Cooperative Association is acknowledged for submitting the special permission. The present study was supported by a research grant from the Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (KAKENHI; grant nos. 18H03387). The authors express their thanks to two anonymous reviewers and the corresponding editor of Fisheries Science for useful comments. The authors would like to thank Editage (www.editage.com) for English language editing.
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IT Conceptualization, Funding acquisition, Methodology, Project administration, Validation; Visualization, Writing–original draft, and Writing–review/editing. MM Data curation, Formal analysis, Investigation, Methodology, and Writing–original draft. HI Data curation, Formal analysis, Methodology, and Writing–review/editing. KT Methodology, Formal analysis. HY Investigation, Methodology.
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Takeuchi, I., Mizuguchi, M., Ishibashi, H. et al. Upper thermal tolerance of hermatypic coral Acropora digitifera collected from Sesoko Island, southern Japan, based on a laboratory experiment. Fish Sci 89, 181–189 (2023). https://doi.org/10.1007/s12562-022-01657-3
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DOI: https://doi.org/10.1007/s12562-022-01657-3