Stable carbon isotope ratios differentiate autotrophs supporting animal diversity in Lake Baikal |
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| Institution: | 1. UCL Qatar, PO BOX 25256, 2nd Floor Georgetown Building, Hamad bin Khalifa University, Doha, Qatar;2. Department of Earth and Environmental Sciences, KU Leuven;3. Faculty of Archaeology, Universiteit Leiden; Instituto Tecnológico de Santo Domingo;1. Department of History, Philosophy, Culture and Art Studies, P.O. Box 59, FI-00014, University of Helsinki, Finland;2. Arkteekki ltd, Finland;3. Department of Archaeology, University of York, The King''s Manor, York YO1 7EP, UK / Oxford Archaeology ltd, Janus House, Osney Mead, Oxford, OX2 0ES, UK;4. Peter the Great''s Museum of Anthropology and Ethnography (Kunstkamera), Russian Academy of Sciences, Universitetskaya Nab. 3, RU 199034, St. Petersburg, Russia |
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| Abstract: | Stable carbon isotopes (δ13C) were determined for autotrophic producers and animals from Lake Baikal (eastern Siberia), the deepest, the oldest and largest body of fresh water in the world. The extensive survey shows that the mean carbon isotope compositions of planktonic and benthic autotrophs differ in Lake Baikal by 21.5 ‰ the largest difference ever observed for lakes, thus giving an easy means to distinguish between pelagic and inshore carbon flows. Furthermore, our data give evidence that inshore macrofauna, which contributes greatly to the diversity within Baikalian animals, is supported by less abundant but highly diversified benthic flora, rather than by phytoplankton or terrigenous organic matter that dominate in the global carbon cycle of the lake. |
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