Abstract
Stable isotope ratios of hydrogen, oxygen, nitrogen and carbon can serve as (palaeo‐) environmental indicators [eg, Ramesh et al., 1986]. 2H and 18O have the clearest relationship with precipitation and temperature, while the sensitivity of carbon is thought to be far less pronounced, and understanding is not complete. Carbon isotopic variation in ecosystems is mainly due to photosynthesis in plants, and passed on in the foodweb without much overall modification (this enables palaeodiet reconstructions using archaeological bone [Schwarcz, 1991]). Using radiocarbon databases [Van der Plicht, 1992] which also contain 13C data, we have compared a number of European countries for geographical variation in 13C/12C ratio of archaeological wood, charcoal and bone samples. We find similar trends for all three materials. A significant trend from northwestern to southern Europe exists in the plant samples, which we relate to climatic differences influencing 13C/12C ratios during carbon fixation. This shift passes through the food web, and is thus found in the bone samples, which makes it possible to use accumulated bone stable isotopic data for palaeoclimatic reconstructions.
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