The corals at Con Dao archipelago (south Vietnam): Before, during and after the bleaching event in 1998

  • Tuan V
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Reef Check with more detail records was used to monitor variation of coral community of Con Dao archipelago. By April 1998, exposed reefs showed major hard coral cover loss (up to 100%) due to the typhoon, while repeated surveys of 6 sites not hit by the typhoon revealed that high coral cover was still present. Follow-up surveys in October 1998 coincided with the world-wide bleaching event. The frequency of coral colonies suffering bleaching ranged from 0 to 74.2% (n=11 sites) with a mean value of 37% not including more than 10% considered as mortality up to this time. The soft coral Sinularia was most affected by bleaching with almost 100% colonies bleached and then the fire coral Millepora (83%). The hard corals belonging to strongly impacted group included Porites (57%), Symphyllia (42%), Leptastrea (40%), …and also Acropora. Contrarily, there was no bleaching among 45 Galaxea colonies observed. In July 1999, most reefs showed recovery with some new recruits evident, but coral abundance was less than that before bleaching. The long-term influence was significant for massive corals, especially big Porites colonies.

Author-supplied keywords

  • bleaching
  • corals
  • recovery
  • reef check

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  • Vo Si Tuan

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