Ocean Science Journal

, Volume 52, Issue 2, pp 267–275 | Cite as

Application of the coral health chart to determine bleaching status of Acropora downingi in a subtropical coral reef

  • Mahshid Oladi
  • Mohammad Reza ShokriEmail author
  • Hassan Rajabi-Maham


The ‘Coral Health Chart’ has become a popular tool for monitoring coral bleaching worldwide. The scleractinian coral Acropora downingi (Wallace 1999) is highly vulnerable to temperature anomalies in the Persian Gulf. Our study tested the reliability of Coral Health Chart scores for the assessment of bleaching-related changes in the mitotic index (MI) and density of zooxanthellae cells in A. downingi in Qeshm Island, the Persian Gulf. The results revealed that, at least under severe conditions, it can be used as an effective proxy for detecting changes in the density of normal, transparent, or degraded zooxanthellae and MI. However, its ability to discern changes in pigment concentration and total zooxanthellae density should be viewed with some caution in the Gulf region, probably because the high levels of environmental variability in this region result in inherent variations in the characteristics of zooxanthellae among “healthy” looking corals.

Key words

Symbiodinium bleaching zooxanthellae density mitotic index chlorophyll content 


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Copyright information

© Korea Institute of Ocean Science & Technology (KIOST) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Mahshid Oladi
    • 1
  • Mohammad Reza Shokri
    • 1
    Email author
  • Hassan Rajabi-Maham
    • 1
  1. 1.Faculty of Biological Science and TechnologyShahid Beheshti University, G.C.TehranIran

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