Correction to: Polar Biol https://doi.org/10.1007/s00300-018-2300-y

During initial stage of copyediting, extra columns were spanned in Table 2; i.e., 6 and 7 and 10 and 11 resulting from automation. This produced an extra space between columns, which went unnoticed following the proofing stage. There was no request for a correction until publication. The publisher sincerely apologizes to the authors for the inconvenience caused. The original article has been corrected.