Arctic Frontiers 2009, Fri 23.01, Session V: Marine food web dynamics in an era of climate warming Chair: Lisa Bjørnsdatter Helgason 09:00 Key lecture IX: L. Fortier: Circumpolar comparison of the hatching season of Arctic cod: a test of the freshwater hypothesis 09:30 Key lecture X: H. Hop: Key players in the marine food web of Kongsfjorden, Svalbard 10:00 Key lecture XI: M. Reigstad & J. Carroll: Carbon flux, ecosystem feed back and climate change in the seasonal ice zone of the Barents Sea (Javascript is required to view Mediasite content)