population from the southern North Sea, i.e. from the warmest range of the species, to a population from the northern Atlantic, from the fjords of Spitsbergen and the Barents Sea. They are two extreme populations [...] and oxygen depletion? Ocean acidification, temperature rise, oxygen depletion and pollution of the seas – these are, of course, all factors that reinforce or weaken one another and jointly have an impact [...] Report on Ocean Acidification Summary of the current knowledge on ocean acidification Changes of the sea water chemistry This dataset has both historic and forecasted model-based changes in the ocean's carbonate