Fig. 7 Heatmaps of Euclidean distance based on the proteomic spectrum of specimens from different regions (annotation, abbreviations see Fig. 1), hierarchical clustering with average linkage, congener pairs included:Acartia clausi and A. longiremis, Centr opages typicus and C. hamatus, Temora stylifera, and T. longicornis, Calanus hyperboreus and C. finmarchicus