Venn diagrams showing the number of site-specific and shared OTUs among the six sampling stations.

Abstract

<p>(A) V4 at Naples, Oslo Fjord, Gijon and Blanes (B) V9 at Varna, Oslo Fjord, Naples and Roscoff (C) V9 at Oslo Fjord, Gijon, Blanes and Naples. Venn diagrams for V9 have been split into two figures to compare OTU distribution among the sequence-abundant stations Naples and Oslo and the other four stations.</p