Phylogenetic patterns
No strong multi-species clusters (based on species means) could be identified for a particular genus (Fig. 4), although there is a tendency of some congener pairs to form common clusters, e.g. Calanus, Pseudocalanus and some Acartia and Centropages species. Prominent similarity was found between the congener pairs A. danae and A. negligens , as well as C. chierchiae andC. typicus . The latter also shows strong overlaps in the important peaks for species classification. The Principal Coordinates Analysis (PCoA) on proteomic spectra of congener species revealed a general similarity between congeners of Acartia , Calanus ,Centropages , Metridia , Pseudocalanus andTemora (Fig. 5), however with overlap between congener groups.