Dear colleagues, just shortly before Christmas time, we would like to draw your attention to the EGU session BG5.03 "Application of Stable Isotopes in Biogeosciences" (Convenor: Böttcher, M.E.; Co-Conveners: Bouillon, S.; Buchmann, N.) at the European Geosciences Union (EGU) General Assembly 2007 (Vienna, Austria, 15 -20 April 2007) This session is open to all contributions in biogeochemistry and ecology where stable isotope techniques are used as analytical tools, with a focus on stable isotopes of light elements (C, H, O, N, S, …). We welcome studies from both terrestrial and aquatic environments as well as methodological and experimental studies that introduce new approaches or techniques (including natural abundance work and labelling studies). Results from the successful EGU session on the ‘Application of Stable Isotopes in Biogeosciences’ that took place in 2005 have recently been published in a special issue of Organic Geochemistry (Bouillon & Böttcher (eds.) Vol.37, Issue 10, p.1197-1425). All information can be found under http://meetings.copernicus.org/egu2007. The deadline for the receipt of abstracts is January 15th, 2007. Please do not hesitate to contact us in case of any questions. We hope that we can stimulate your interest in the programme and we are looking forward to receiving your contributions on new stable isotope results, and meeting you in Vienna. Merry Christmas and a happy new year, Michael Böttcher, Steven Bouillon, Nina Buchmann (IO Warnemünde, Uni Brussel, ETH Zurich) ***************************************************************** Prof.Dr. Michael E. Böttcher Leibniz Institute for Baltic Sea Research Marine Geochemistry-Geology Seestr.15 D-18119 Warnemünde, Germany Phone: 0049-381-5197-402