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Monthly progression rates of the coral-killing sponge Terpios hoshinota in Sesoko Island, Okinawa, Japan

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Abstract

Terpios hoshinota is a black, encrusting sponge that hosts numerous symbiotic cyanobacteria in its tissues. The sponge often overgrows live scleractinian corals, thereby causing widespread and accelerated coral loss. However, our understanding of how subtropical waters influence the seasonal change in the progression rate of the sponge is poor. To elucidate the progression dynamics over a year, we obtained monthly measurements of linear progression of T. hoshinota (mm month−1) on the branching coral Montipora digitata in the subtropical waters of Sesoko Island, Okinawa, Japan from 2019 to 2020. The progression rate of T. hoshinota varied monthly throughout the year. The progression rates were the highest in summer (July, August, and October) with a mean value of 66 mm month−1, except in September, when strong typhoons came close to Okinawa and the progression rate decreased temporarily. The progression rates were the lowest in February 2020, at 9 mm month−1. The mean annual linear progression rate was estimated to be 28 mm month−1. Therefore, the progression dynamics of T. hoshinota could be linked to their growth mechanisms in relation to the seasonal changes in subtropical waters.

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Data availability

The datasets generated or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

This work was supported by JSPS (Japan Society for the Promotion of Science) KAKENHI (no. 19K06091 to HY). We thank the staff of Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus for their kind support. Coral sampling was carried out with the approval of the authorities of Okinawa Prefecture, Japan. We are grateful to anonymous reviewers with their comments and suggestions. All necessary permits for sampling and observational field studies were obtained from the concerned authorities and are mentioned in the acknowledgments section

Funding

This work was supported by a grant from the Japan Society for the Promotion of Science (JSPS) KAKENHI (grant no. 19K06091).

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by SNA and HY. All authors read and approved the final manuscript.

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Correspondence to Hideyuki Yamashiro.

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The authors declare that they have no conflicts of interest.

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Aini, S.N., Tang, SL. & Yamashiro, H. Monthly progression rates of the coral-killing sponge Terpios hoshinota in Sesoko Island, Okinawa, Japan. Coral Reefs 40, 973–981 (2021). https://doi.org/10.1007/s00338-021-02099-6

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  • DOI: https://doi.org/10.1007/s00338-021-02099-6

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