Increasing pressures from human-induced activities are causing habitat loss and degradation, fisheries declines, and overall reductions in estuarine health and productivity. Associated physical alterations, such as dredging, damming, and bulkheading, change the natural flow of fresh water to estuaries, dramatically affecting water quality. Toxic substances and excess nutrients contribute to fish diseases, algal blooms, and low dissolved oxygen and can pose a threat to the health of humans and estuarine wildlife. Because of this drop of wildlife, humans could lose needed areas for fishing, healthy drinking water, or good soil to grow crops. With such pollutants, humans could lose what they desperately need to survive.
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