Reduced trends of annual growth of Indonesian Porites over ~20 years

Annual coral growth bands serve as an important indicator for detecting the response of coral reefs to environmental change, through the study of coral growth chronologies and geochemical analysis of the skeleton. In this study, we analyzed the annual linear growth rates of 10 Porites coral colonies from Indonesia. Samples were taken from Natuna (South China Sea), Wakatobi (Banda Sea), Maumere (Flores Sea) and Biak (Indo-West Pacific Sea). Each location, with the exception of Natuna, was represented by three colonies. Annual growth rates (linear extension) were determined from the annual high and low density banding patterns observed using X-ray techniques. Coral XDS was used to calculate annual linear extension. Average linear growth of Porites colonies ranged from 0.4 cm to 1.4 cm/year over the past ~20 years. Seven of the ten Porites from Indonesia have displayed reduced linear growth over the past~20 years. However, three colonies showed increasing linear growth, for example WDB (North Eastern Biak), SRM (Southern Biak) and MMR4 (Maumere coast). At the Wakatobi site, all three Porites colonies showed reduced linear growth.

Suharsono & Sri Yudawati Cahyarini, 2012. Reduced trends of annual growth of Indonesian Porites over ~20 years. Proceedings of the 12th International Coral Reef Symposium, Cairns, Australia, 9-13 July 2012. 8D Effects of ocean acidification. 5 pp. Article.

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