Fig. 3. Biogeographical mapping of the node-specific abundance for each protein family (Pfams) network across all stations from pole to pole.

Contribution of Pfam containing sequences from individual metatranscriptome sites to corresponding protein family co-occurrence networks. Bubbles scaled according to percentage contribution to total abundance pool. A Pfam biogeography of cold co-occurrence network and B Pfam biogeography of warm co-occurrence network. Abundance is given in percentage contribution to the total sequence pool per site with increasing contribution from small to large circles and from blue to red.