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nitrates(7)
oxygen(6)
sea water(6)
sediment(6)
stable isotopes(6)
biogeochemistry(5)
ecosystems(5)
phytoplankton(5)
biomass (ecology)(4)
carbon dioxide(4)
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grasslands(4)
isotopes(4)
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oceans(4)
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surface water(4)
atmospheric chemistry(3)
biodiversity(3)
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