Fig. 2

Number of contaminated sites with different pesticide classes (and preservative agent) in the four seasons. Names of detected residues across all sites within a season are listed for each pesticide class; not all residues were found at each site. Total number of residues = 33. Significance values *** (p < 0.001, adj. Fisher’s exact for multiple comparisons across seasons and within seasons) denote the difference between the total number of residues and number of EDA residues for spring and summer compared to winter