In situ growth and mortality of juvenile Acropora over 2 years following mass spawning in Sekisei Lagoon,Okinawa (24°N) |
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Authors: | Okamoto Mineo Yap Minlee Roeroe Andreus Kakaskasen Nojima Satoshi Oyamada Kumi Fujiwara Shuichi Iwata Itaru |
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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, Campus Bahu, Manado, 95115, Indonesia;(3) Kyushu University, Kumamoto 863-2507, Japan;(4) JFE Steel Corporation, Tokyo 100-0011, Japan;(5) IDEA Consultants, Naha Okinawa, 900-0003, Japan;(6) Fuyo Ocean Development & Engineering (FODECO), 2-5-6 Kuramae, Taito-ku, Tokyo 111-0051, Japan |
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Abstract: | The growth of Acropora in Sekisei Lagoon was investigated in situ using ceramic coral settlement devices (CSDs) and marine blocks (MBs) with small
holes on their surfaces that were deployed prior to a mass spawning event. Acropora that had settled in 10-mm holes on the upper surface of the MBs were found to have grown inwards after 348 days post-mass
spawning. After 733 days, the colonies had grown outwards, encrusting the blocks and attaining a maximum diameter of 21.5 mm
(3.7 mm). CSDs that had been stacked above each other on frames were separated and observed in situ on 405 and 764 days after
mass spawning. After 405 days, the maximum diameter of the encrusting Acropora was 7.6 mm (±2.4 mm), which increased to 19.4 mm (±5.5 mm) after 764 days, with 30% of colonies extending short branches.
The length of the branches of Acropora grown on the CSDs fixed to the MBs 3 months after the mass spawning event exceeded the size of the encrusting portion of
the colony 629 days after spawning. The mortality of colonies between 1 and 2 years was slight, with the temperatures conducive
to coral bleaching that occurred during the study also having only a slight effect. |
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