Lakes FH, SL, TF, and OR demonstrate a slight increase in DDD and DDE concentrations after year 2000. described the same phenomenon in a sediment core from a lake situated downhill of a vineyard in France in the 1990s. According to their theory, legacy pesticides (DDT among others) were remobilized from the soil by increased erosion, which in turn was caused by the application of the herbicide glyphosate, as it leads to a reduction in canopy above the soils, leaving them vulnerable to erosion. A similar effect could be imaginable here.