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Development of a coastal environment assessment system using coral recruitment
Authors:Kakaskasen A Roeroe  Minlee Yap and Mineo Okamoto
Institution:(1) Tokyo University of Marine Science and Technology, 4-5-7 Konan Minato-ku, Tokyo 108-8477, Japan;(2) Faculty of Fisheries and Marine Sciences, Sam Ratulangi University, Kampus Bahu, Manado, 95115, Indonesia;(3) Directorate of Conservation and Marine National Park, Ministry of Marine Affairs and Fisheries, Jakarta, 10110, Indonesia
Abstract:A new method for assessing coastal environments using the reproduction potential of corals has been developed and examined in situ. Six assessment racks were deployed before the full moon of May 2006 at three sites located around a river outlet in Nagura Bay, Ishigaki Is. and at one control location in Sekisei Lagoon. Each rack was equipped with two marine blocks (MB) containing 378 holes, two cases of coral settlement devices (CSDs), each containing 120 CSDs, and a water temperature logger. Assessment was based on recruitment of Acropora due to mass spawning. After 4 months of deployment, the surface of assessment racks showed apparent biofouling depending on sites mainly by algal settlement on the surfaces. Almost all the holes of the MBs were partly occupied, mainly by turf algae. Nagura Bay was thought likely to be an “unhealthy” coral reef due to runoff from land. However, our assessment showed that there were 0.85 corals per CSD in the Bay, compared with 0.51 in Sekisei Lagoon, indicating that coral larvae supply is not the cause of the unhealthy condition of corals in the Nagura Bay.
Keywords:Coral recruitment  Coral reef  Coral settlement device  Marine block  Nagura Bay  Terrestrial runoff
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