In situ release of coral mucus by <Emphasis Type="Italic">Acropora</Emphasis> and its influence on the heterotrophic bacteria |
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Authors: | Ryota Nakajima Teruaki Yoshida Bin Abdul Rahim Azman Kassim Zaleha Bin Haji Ross Othman Tatsuki Toda |
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Institution: | (1) Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, Tangi, Hachioji Tokyo, 192-8577, Japan;(2) Marine Ecosystem Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;(3) Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia |
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Abstract: | In situ mucus release by Acropora nobilis and degradation of mucus from A. nobilis and Acropora formosa, by heterotrophic bacteria were investigated at Bidong and Tioman Island, Malaysia. Mucus release rate for A. nobilis was on average 38.7 ± 35.2 mg C m−2 h−1, of which ca. 70% consisted of dissolved organic carbon (DOC) and 30% particulate organic carbon (POC). In the mucus degradation
experiment, seawater-mucus mixtures were incubated and compared with control runs for 24 h. Bacterial abundance in the seawater-mucus
mixture increased significantly and coincided with a decline in DOC concentration. In controls, bacteria and DOC did not significantly
change. The coral mucus had a high content of inorganic phosphate. It is suggested that the coral mucus rich in DOC and phosphate
can induce the high bacterial growth. |
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