Y Olsen Editor

E. Moksness is based at the Institute of Marine Research, Flodevigen Marine Research Station, His, Norway.

E. Kjorsvik is at the Department of Biology, Brattora Research Center, Norwegian University of Science and Technology, Trondheim, Norway.

Y. Olsen is at the Trondheim Biological Station, Department of Biology, Norwegian University of Science and Technology, Trondheim, Norway.