Photophysiology of in hospite zooxanthellae in diseased and non-diseased scleractinian corals from Belle Mare, Mauritius

  • Sushma Mattan-Moorgawa Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.
  • Deepeeka Kaullysing Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.
  • Nawsheen Taleb Hossenkhan Department of Biosciences, Faculty of Science, University of Mauritius.
  • Soonil DDV Rughooputh Department of Physics, Faculty of Science, University of Mauritius, Reduit, Mauritius
  • Ranjeet Bhagooli Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.
Keywords: coral disease, Mauritius, photophysiology, scleractinian corals

Abstract

This study investigated the occurrence of white band disease (WBD, tissue sloughing) and white plague (WP, com- plete whitening) among six scleractinian corals at Belle Mare, Mauritius. Photosynthetic responses of in hospite zoox- anthellae in diseased and non-diseased/ healthy corals were characterised via e ective quantum yield (ФPSII or ΔF/Fm, light-adapted), relative maximum electron transport rate (rETRmax), and non-photochemical quenching (NPQ), using a Diving Pulse-Amplitude Modulated (D-PAM) uorometer. Coral disease occurrence survey (n=20 colonies) and sampling for diseased and non-diseased/ healthy corals were carried out at 9 stations along 3 transects across the lagoon from coast to reef, for the November 2013 to February 2014 summer non-bleaching months. A higher percentage (90%) of disease occurrence was observed in Acropora muricata (WBD 45%; WP 55%) than in Pocillopora damicornis (WBD only 10%). Pocillopora eydouxi, Galaxea fascicularis, Acropora cytherea, and Fungia repanda exhibited no diseases. ФPSII was normal (0.60±0.01) in all non-diseased/ healthy corals, but was signi cantly low (<0.20) in diseased corals in healthy-looking tissues adjacent to disease lesions. Low ФPSII was accompanied by low rETRmax and NPQ, indicating damage to photosynthetic apparatus in WBD-a ected A. muricata. The ndings indicated a higher suscep- tibility of A. muricata to the two diseases and may have implications for coral reef management and conservation. 

 

Author Biographies

Sushma Mattan-Moorgawa, Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.
Sushma Mattan-Moorgawa is a Lecturer in the field if Marine and Environmental Sciences at the Department of Marine and Ocean Science, Fisheries and Mariculture,
Faculty of Ocean Studies, University of Mauritius. She is also undergoing her last year of part-time PhD research.
Deepeeka Kaullysing, Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.
Lecturer at the Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies,
University of Mauritius.
Nawsheen Taleb Hossenkhan, Department of Biosciences, Faculty of Science, University of Mauritius.

Senior Lecturer and Head of Department,

Department of Biosciences,

Faculty of Science,

University of Mauritius

Reduit

Mauritius

Soonil DDV Rughooputh, Department of Physics, Faculty of Science, University of Mauritius, Reduit, Mauritius

Professor (Physics)

Department of Physics,

Faculty of Science,

University of Mauritius

Ranjeet Bhagooli, Department of Marine and Ocean Science, Fisheries and Mariculture, Faculty of Ocean Studies, University of Mauritius. Reduit, Mauritius.

Associate Professor (Marine Science and Biosciences)

Department of Marine and Ocean Science, Fisheries and Mariculture,
Faculty of Ocean Studies,
University of Mauritius.

Published
2017-08-14
Section
Articles

Journal Identifiers


eISSN: 0856-860X
print ISSN: 0856-860X