Figure 1.

Concentrations in ng/L of [d-Asp³,(E)-Dhb⁷]MC-RR (top) and Anabaenopeptin A (bottom) in Lake Greifensee from 2019 to 2023, with n = 21–36 annual sampling dates for biomass (black, triplicates) and aqueous samples (blue, triplicates). Dashed lines indicate the limit of quantification for each annual data set run on separate LC-MS sequences each year. Each data point represents one sample out of triplicate samples collected on each sampling date. Solid lines connect the average concentration of these triplicate samples on each sampling date, while white spaces between data sets reflect the dates where no sampling took place.