AGATA WEYDMANN1*, JANNE E. SØREIDE2, SŁAWEK KWAŚNIEWSKI1, EVA LEU3, STIG FALK-PETERSEN3,4 AND JØRGEN BERGE2,4 1 INSTITUTE OF OCEANOLOGY, POLISH ACADEMY OF SCIENCES, POWSTANCOW WARSZAWY ST. 55, 81-712 SOPOT, POLAND, THE UNIVERSITY CENTRE IN SVALBARD, N-9171 LONGYEARBYEN, NORWAY, THE NORWEGIAN POLAR INSTITUTE, N-9296 TROMSØ, NORWAY AND FACULTY OF BIOSCIENCES, FISHERIES AND ECONOMICS, UNIVERSITY O...