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population(61)
surface water(34)
lakes(26)
oxygen(20)
sediments(17)
carbon(16)
conservation(15)
ph(12)
oceans(11)
biomass(10)
degradation(10)
mortality(10)
density(9)
invasive species(9)
nitrogen(8)
water quality(8)
iron(7)
islands(7)
wetlands(7)
phosphorus(6)
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