Relative abundance of alphaproteobacterium LD12 compared with A. lacustris. The relative abundances were assessed for public lake metagenomes Vattern, Sparkling (Summer), Sparkling (Spring), Mendota (Summer), Mendota (Spring), Erken, Ekoln, Damariscotta (Summer) and Damariscotta (Spring) and public SSU amplicon data sets Rare biosphere at the North Falmouth Fire Station (VAMPS accession: RARE_NFF_Bv6v4), ~25 lakes and streams of the Toolik Lake Research Area sequencing run 1 and 2 (SRA accessions: SRR305966, SRR305967). Each point represents the relative abundance of a LD12 SAG (described in (Zaremba-Niedzwiedzka et al., 2013)) for lake metagenomes and the relative abundance of the LD12 SSU sequence (accession no. Z99997.1) for the amplicon data sets. Points are jittered and colored alternating black and dark gray per data set to improve readability.