Figure S1. Phylogenetic tree of Isochrysidales 18S rRNA detected in the northern Antarctic Peninsula region1. Bootstrap values that are >50% are shown. Liu et al.1 collected surface water samples and water column samples in the northern Antarctic Peninsula region. Only three samples collected from water column at depth of 150m, 200m, 340m at 60.85˚S, 45.64˚W recovered Isochrysidales DNA, all three ASVs falls into Group 2i.