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population(72)
conservation(54)
fisheries(25)
oceans(19)
density(15)
lakes(15)
wetlands(14)
surface water(13)
forests(12)
mortality(12)
islands(11)
landscape(11)
vegetation(11)
lead(9)
isotopes(8)
salinity(8)
beaches(7)
coral reefs(7)
surface temperature(7)
estuaries(6)
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