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| Atsushi Suzuki | |
| Marine Resources and Environmental Division | |
| Marine Geology Department | |
| Geological Survey of Japan | |
| Higashi 1-1-3, Tsukuba, Ibaraki, 305-8567, Japan | |
| Tel/Fax: +81-298-61-3769 | |
| E-mail: a_suzuki@gsj.go.jp |
9,641,000 Yen
(FY 1999; 2,896,000 Yen)
Measurements of carbon dioxide system parameters and nutrients revealed a potential influence of terrestrial inputs on community structure as well as carbon budget in a fringing coral reef of Ishigaki Island, where currently coral reefs are greatly stressed by human activities. Land derived fresh waters including river water and groundwater are extremely high in the fugacity of carbon dioxide up to 6,400 μatm, reflecting enrichments in total alkalinity and dissolved inorganic carbon. Since dissolved inorganic C:P ratio is anomalously high in terrestrial waters compared to mean C:P ratios of primary production, excess carbon has a potential to be released to the atmosphere and to decrease saturation degree of reef waters with respect to calcium carbonate. Terrestrial inputs deliver large quantity of C relative to P, probably resulting in modification of community structures.
Coral Reefs, Biodiversity, Carbon Dioxide, Circulation, Nutrients, Groundwater