Abundance of Meringosphaera group 1 and 2 and respective plastids detected in the monthly sampling from the Swedish west coast. The top panel shows the number of 18S rDNA gene copies L-1 for the Meringosphaera group 1 and group 2 and the lower panel shows the respective number of rbcL gene copies L-1 for the plastid group 1 and group 2. The group identity of the hosts and plastids is indicated by the color of the points. The abundance is reported as the Log of the gene copies L-1. The samples were taken monthly between March 2021 and February 2022, in addition two extra samples were taken in October and November 2020, and these are indicated by triangle-shaped points. There is variation in the number of locations sampled, which is why the number of points varies between the months (see Figure S2 and STAR Methods for details). If the target was detected in some but not all of the technical replicates, the sample was marked as detected but not quantifiable and was plotted with a value of 1.1. Data are represented as the mean +- SEM. See also Figure S3 for the hydrographic conditions at the sampling stations.
