Fig. 6

Occurrence frequency of planktonic ARG subtypes in spring (a) and autumn (b) as well as hosts in spring (c) and autumn (d) fitted to the mean relative abundance using Sloan et al.’s neutral model [45]. Inserts in (a) and (b), and (c) and (d) show neutral model fits to ARG type and HPB. respectively. Purple and green dots indicate ARGs/hosts that occur more (“above”) and less (“below”) frequently than given by the neutral model (gray dots, “neutral”). R² indicates the fit to the neutral model, and m indicates the immigration rate. Dashed lines represent the 95% confidence intervals about the model prediction