Seawater carbonate chemistry, community calcification and photosynthesis during experiments with coral reefs at Shiraho reef, Ishigaki Island, southwest Japan, 2009, supplement to: Nakamura, T; Nakamori, T (2009): Estimation of photosynthesis and calcification rates at a fringing reef by accounting for diurnal variations and the zonation of coral reef communities on reef flat and slope: a case study for the Shiraho reef, Ishigaki Island, southwest Japan. Coral Reefs, 28(1), 229-250

• Main Authors: Nakamura, T, Nakamori, T
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Entire community; Field experiment; North Pacific; Primary production/Photosynthesis; Rocky-shore community; Temperate; Site; Date/time start; Date/time end; Salinity; Temperature, water; Radiation, photosynthetically active; Carbonate system computation flag; pH; Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide; Carbonate ion; Bicarbonate ion; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcite saturation state; Calcification rate of calcium carbonate; Net photosynthesis rate; Experiment; Salinometer Model 601 MK-IV, Yeo-Kal Electronics Pvt. Ltd.; Temperature/pH-logger; Photon flux sensor MDS MkV/L, Alec Electronics Co., Ltd; Calculated using seacarb after Nisumaa et al. 2010; pH meter Radiometer, PHM, 240; Potentiometric open-cell titration; Calculated; Alkalinity anomaly technique Smith and Key, 1975; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.721856; https://doi.pangaea.de/10.1594/PANGAEA.721856

Seven coral reef communities were defined on Shiraho fringing reef, Ishigaki Island, Japan. Net photosynthesis and calcification rates were measured by in situ incubations at 10 sites that included six of the defined communities, and which occupied most of the area on the reef flat and slope. Net photosynthesis on the reef flat was positive overall, but the reef flat acts as a source for atmospheric CO2, because the measured calcification/photosynthesis ratio of 2.5 is greater than the critical ratio of 1.67. Net photosynthesis on the reef slope was negative. Almost all excess organic production from the reef flat is expected to be effused to the outer reef and consumed by the communities there. Therefore, the total net organic production of the whole reef system is probably almost zero and the whole reef system also acts as a source for atmospheric CO2. Net calcification rates of the reef slope corals were much lower than those of the branching corals. The accumulation rate of the former was approximately 0.5 m kyr?1 and of the latter was ~0.7-5 m kyr?1. Consequently, reef slope corals could not grow fast enough to keep up with or catch up to rising sea levels during the Holocene. On the other hand, the branching corals grow fast enough to keep up with this rising sea level. Therefore, a transition between early Holocene and present-day reef communities is expected. Branching coral communities would have dominated while reef growth kept pace with sea level rise, and the reef was constructed with a branching coral framework. Then, the outside of this framework was covered and built up by reef slope corals and present-day reefs were constructed. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).