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- Title
Development of a coastal environment assessment system using coral recruitment.
- Authors
Roeroe, Kakaskasen A.; Minlee Yap; Okamoto, Mineo
- 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.
- Subjects
ISHIGAKI Island (Japan); JAPAN; CORAL reefs &; islands; CORAL reproduction; ACROPORA; ACROPORIDAE; ALGAE; FOULING; MARINE biology
- Publication
Fisheries Science, 2009, Vol 75, Issue 1, p215
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-008-0031-7