Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 9 2009 10.5194/bg-6-1877-2009 http://www.biogeosciences.net/6/1877/2009/ http://www.biogeosciences.net/6/1877/2009/bg-6-1877-2009.html http://www.biogeosciences.net/6/1877/2009/bg-6-1877-2009.pdf 1877 1882 2009-09-04 Impact of ocean acidification on a key Arctic pelagic mollusc (<i>Limacina helicina</i>) S. Comeau comeau@obs-vlfr.fr G. Gorsky R. Jeffree J.-L. Teyssié J.-P. Gattuso CNRS-INSU, Laboratoire d'Océanographie de Villefranche, BP 28, 06234 Villefranche-sur-Mer Cedex, France Université Pierre et Marie Curie-Paris 6, Observatoire Océanologique de Villefranche, 06230 Villefranche-sur-Mer, France Marine Environmental Laboratories, International Atomic Energy Agency, 4 quai Antoine 1^er 98000 Monaco, Principality of Monaco Thecosome pteropods (shelled pelagic molluscs) can play an important role in the food web of various ecosystems and play a key role in the cycling of carbon and carbonate. 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