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water quality(125)
water pollution(48)
surface water(45)
water resources(33)
lakes(23)
rivers(21)
water management(19)
sediment(15)
fresh water(13)
habitats(12)
climate change(11)
ecosystems(10)
seasons(10)
turbidity(10)
phytoplankton(9)
algae(8)
bacteria(8)
cyanobacteria(8)
polymerase chain reaction(8)
sea water(8)
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