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<p>In shallow water zooxanthellate coral communities, large aggregations of benthic groups other than scleractinians have been occasionally noted and sometimes linked with various disturbances. Here, we report on a large aggregation of a corallimorpharian, <i>Rhodactis</i> aff. <i>indosinensis</i>, at a site off Himeshima Island, Kochi, Japan, from surveys in July 2023 and August 2024. The overall area reached approximately 2100 m<sup>2</sup> in 2024, with corallimorpharians accounting for approximately 70% of all benthic coverage. No such aggregation was noted in similar surveys in July 2016. While the cause of this aggregation formation is not known, it is possible that unusually cold winter seawater temperatures in 2018–2019 may have caused favorable conditions for <i>Rhodactis</i>, given that benthic space was available. Regardless of the cause, this is among the first reported corallimorpharian outbreaks in Japan, and we recommend continued monitoring of this site.</p>

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A corallimorpharian barren in southwestern Kochi, Japan

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • James Davis Reimer,
  • Fabian Gösser,
  • Kenta C. F. Kondo,
  • Stephane De Palmas,
  • Daito Yamaguchi,
  • Maria Beger,
  • Brigitte Sommer,
  • Fiona Chong,
  • Camille Burke,
  • Ayaka Umeda Paul,
  • James Lock,
  • Takuma Mezaki

摘要

In shallow water zooxanthellate coral communities, large aggregations of benthic groups other than scleractinians have been occasionally noted and sometimes linked with various disturbances. Here, we report on a large aggregation of a corallimorpharian, Rhodactis aff. indosinensis, at a site off Himeshima Island, Kochi, Japan, from surveys in July 2023 and August 2024. The overall area reached approximately 2100 m2 in 2024, with corallimorpharians accounting for approximately 70% of all benthic coverage. No such aggregation was noted in similar surveys in July 2016. While the cause of this aggregation formation is not known, it is possible that unusually cold winter seawater temperatures in 2018–2019 may have caused favorable conditions for Rhodactis, given that benthic space was available. Regardless of the cause, this is among the first reported corallimorpharian outbreaks in Japan, and we recommend continued monitoring of this site.