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density(6)
sediments(5)
population(4)
surface water(4)
biomass(3)
drought(3)
forests(3)
heavy metals(3)
lakes(3)
metals(3)
precipitation(3)
urban areas(3)
community dynamics(2)
conservation(2)
diffusion(2)
mortality(2)
nitrogen(2)
oxygen(2)
phosphorus(2)
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