Figure 1

Chemical parameters between 2013 and 2017 in the shallow, intermediate, and deep sites. Chemical parameters were measured on pore water (0–1 cm) for phosphate (µM), total iron (µM), sulfate (mM), and nitrate + nitrite (µM) (in combination) plus on sediment for organic matter (%) in the shallow (salmon), intermediate (green), and deep (black) site in 2013 and 2017. Error bars show the mean and standard deviations (n = 3); significant p-values, ***p < 0.001 **p < 0.01 *p < 0.05.