Back when the Vikings ruled, blue mussels had a natural habitat in Svalbard. They disappeared when the climate cooled, but today blue mussels have re-established themselves at 78 degrees North. The Svalbard blue mussel is thus a clear and present climate indicator of a warming Arctic. The reappearence of the blue mussels is in the focus of the Marine Night PhD student Peter Leopold. At several occasions the topic has been in the media recently:

 

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