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Monthly δ 18 O records of 2 coral colonies (Porites cf. lutea and P. cf. nodifera) from dif- ferent localities (Aqaba and Eilat) from the northern Gulf of Aqaba, Red Sea, were calibrated with recorded sea surface temperatures (SST) between 1988 and 2000. The results show high correlation coefficients between SST and δ 18 O. Seasonal variations of coral δ 18 O in both locations could explain 91% of the recorded SST. Different δ 18 O/SST relations from both colonies and from the same colonies were obtained, indicating that δ 18 O from coral skeletons were subject to an extension rate effect. Sig- nificant δ 18 O depletions are associated with high extension rates and higher values with low exten- sion rates. The relation between coral skeletal δ 18 O and extension rate is not linear and can be described by a simple exponential model. An inverse relationship extends over extension rates from 1 to 5 mm yr -1 , while for more rapidly growing corals and portions of colonies the relation is constant and the extension rate does not appear to have a significant effect. We recommend that δ 18 O values be obtained from fast-growing corals or from portions in which the isotopic disequilibrium is fairly constant (extension rate > 5 mm yr -1 ). The results show that interspecific differences in corals may produce a significant δ 18 O profile offset between 2 colonies that is independent of environmental and extension-rate effects. We conclude that the rate of skeletal extension and the species of coral involved have an important influence on coral δ 18 O and must be considered when using δ 18 O records

Environmental and biological effects on the stable oxygen isotope records of corals in the northern Gulf of Aqaba, Red Sea