Fig. 4: Latitudinal patterns and phylogenetic distance of ASVs of the SAR11 Clade 1 along the transect.

A Heatmap of abundances of SAR11 Clade I-ASVs in the epipelagic along the transect. Abundance was normalized row-wise and displayed by colour. Classification of each ASV is based on SILVA132. Rows are sorted by hierarchical clustering based on Bray–Curtis and separated by gaps that represent clusters inferred from silhouette clustering; B UniFrac dissimilarity of members of the SAR11 Clade I in the epipelagic along the transect. Black dots indicate SAR11 clade I community members of individual samples and the blue line and grey shaded area a loess-fit and its 95% confidence interval.