Using sulfur stable isotopes to assess mercury bioaccumulation and biomagnification in temperate lake food webs

Nitrogen and carbon stable isotopes (δ¹⁵ N, δ¹³ C) are commonly used to understand mercury (Hg) bioaccumulation and biomagnification in freshwater food webs. Though sulfur isotopes (δ³⁴ S) can distinguish between energy sources from the water column (aqueous sulfate) and from sediments to freshwater organisms, little is known about whether δ³⁴ S can help interpret variable Hg concentrations in aquatic species or food webs. Seven acidic lakes in …