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Concentrations of PCB congeners relative to PCB congener 153 for lichen, caribou, and wolf in the Bathurst herd, Canada The light bars denote that the congener was not detectedConcentrations of PCB congeners relative to PCB congener 153 for lichen, caribou, and wolf in the Bathurst herd, Canada The light bars denote that the congener was not detected |
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Sensitivity of Arctic ecosystems to acid depositionSensitivity of Arctic ecosystems to acid deposition |
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(a) Critical deposition of sulfur, and (b) its exceedance, in forest soils of northern Europe and Russia (5th percentile of the calculation points in each EMEP grid cell)(a) Critical deposition of sulfur, and (b) its exceedance, in forest soils of northern Europe and Russia (5th percentile of the calculation points in each EMEP grid cell) |
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Schematic illustration of ecosystem carbon fluxes and nutrient circulation in the tundra Carbon and nutrient pathways are shown by dashed and continuous lines, respectivelySchematic illustration of ecosystem carbon fluxes and nutrient circulation in the tundra Carbon and nutrient pathways are shown by dashed and continuous lines, respectively |
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