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nitrates(70)
sediment(16)
surface water(14)
salinity(11)
phosphates(10)
ecosystems(9)
nitrites(9)
phytoplankton(9)
sea water(9)
diatoms(8)
oxygen(8)
fresh water(7)
water pollution(7)
biogeochemistry(6)
chlorophyll(6)
lakes(6)
nitrification(6)
polymerase chain reaction(6)
ribosomal rna(6)
estuaries(5)
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