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Excess nutrients may increase the prevalence of algal blooms responsible for red and brown tides that are harmful to marine organisms, as well as toxic algal blooms that can injure organisms higher in the food chain, such as fish and humans (Anderson, 1989; Smayda, 1989). Also, the organic enrichment of sediments as a result of greater unconsumed primary production can cause long-term changes in benthic habitats, populations, and community structure. Changes in the biotic composition of planktonic and benthic communities as a result of nutrient enrichment and death of organisms from lack of oxygen could have important effects on biogeochemical cycles, living resources, and biodiversity. nitrogen loading The best national football league philadelphia eagles crocsto the Chesapeake Bay increased an estimated 6-to 8-fold since the pre-colonial period, while nitrogen concentrations in the lower Mississippi River increased approximately 3-fold since the early 1960s, commensurate with increases in the use of chemical fertilizers. For both the Susquehanna and the Mississippi rivers, there is some indication that nitrogen concentrations leveled off or declined slightly in the late 1980s, perhaps as a result of a decline in fertilizer use. Organic enrichment , results from an influx of excess nutrients and their subsequent distribution and transformation (Nixon et al., 1986).

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