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      https://www.ias.ac.in/article/fulltext/jess/130/0208

    • Keywords

       

      Bleaching; hard corals; octocorals; recovery.

    • Abstract

       

      The objective of the present study is to assess the status of the octocoral communities, and the extent of bleaching they suffered in 2016 (in line with the third Global Bleaching Event). Bleaching survey was carried out in the permanently Bxed study sites in the 21 island of Gulf of Mannar. A focused study was carried out in Kariyachalli Island to monitor post-bleaching effects on octocorals. The overall octocoral cover in 2015 was 1.59±0.29%, and octocoral genera such as Sinularia, Sarcophyton, Lobophytum and Subergorgia were observed predominantly in GoM (Gulf of Mannar). Temperature reached a maximum of 32.5°C (March) during 2016 bleaching. The extent of bleaching in 2016 was 1.05±0.65% and the overall octocoral cover was reduced to 1.16±0.22%. Multiple paired t-test results indicate a significant variation in the octocoral covers between 2015 and 2016 (t = 3.173, p${\le}$0.01). Sinularia, Xenia, and Subergorgia were the most affected genera during this bleaching episode. The percentage bleaching in octocorals was the highest in Vembar group of islands (1.9±0.62%) and the continuous monitoring studies reveal the increase in the octocorals diversity from 1.16±0.22% to 1.34±0.21% in 2018 indicating the recoverypattern of octocorals in GoM. Post-bleaching surveys carried out in Kariyachalli Island revealed the occurrence of tissue degradation and algal overgrowth following the bleaching event. However, this study concludes that octocorals in GoM could adapt and Courish in the context of changing climatic conditions. However, more studies on octocoral ecology and biology are warranted.

    • Author Affiliations

       

      MAHALAKSHMI BOOPATHI1 P DINESH KUMAR J K PATTERSON EDWARD

      1. Suganthi Devadason Marine Research Institute, Tuticorin, Tamil Nadu; Affliated to Manonmaniam Sundarnar University, Abishekapatti, Tirunelveli 627 012, India.
    • Dates

       
  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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