The stable isotopic composition of coral skeletons: control by environmental variables |
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| Authors: | Sandra M Weil Robert W Buddemeier Stephen V Smith Peter M Kroopnick |
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| Institution: | 1. Department of Oceanography and Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, U.S.A.;2. Hawaii Institute of Marine Biology, University of Hawaii, Kaneohe, HI 96744, U.S.A. |
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| Abstract: | The reef corals Pocillopora damicornis and Montipora verrucosa were cultured under various controlled temperature and light conditions. The corals were analyzed for growth rate, tissue pigment content and skeletal 13C and 18O. Coral skeletal δ13C values varied with light dose and correlated with changes in zooxanthellar pigment. The δ13C values of skeletal aragonite seem to be modified by oxidation of photosynthetically produced organic matter.Functionally significant relationships between coral skeletal δ18O values and temperature have been determined. The temperature coefficients of the δ18O values ?4.4°C (%.)?1] are similar to the first order coefficient in the equilibrium paleotemperature equation, but the δ18O values have taxonomically consistent offsets from equilibrium. The offsets may be attributed to the coral metabolism with slight but statistically significant differences between the two genera. Environmental and metabolic variables other than temperature have little or no effect on skeletal δ18O. |
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