Letter reSeArCH
extended data table 1 | Mehg in Gulf of Maine plankton
MeHg concentrations (ng g−^1 ; mean ± s.d.) measured in Gulf of Maine plankton between 2000 and 2002^19. Plankton were collected yearly with 3–5 tows and sieved for size fractions. Macroplankton,
ichthyoplankton and nekton were collected yearly with 4–5 Vass–Tucker trawls^19.
*Trophic level (TL) was estimated previously^19 as TL = 1 + (δ^15 N + 0.03)/3.4.