Are there longitudinal effects of forest harvesting on carbon quality and flow and methylmercury bioaccumulation in primary consumers of temperate stream networks?

Catchment explanatory variables (catchment area, % harvest, logging road density, etc.) and response variables (dissolved organic matter quality, autochthony of a primary consumer as determined using hydrogen stable isotopes, and mercury in water and a primary consumer) measured at 12 to 13 streams along a longitudinal gradient in paired reference and harvested catchments in Ontario in 2016 and 2017.