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ESM202Lecture03(eutrophication)_2008

ESM202Lecture03(eutrophication)_2008 - Eutrophication...

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Eutrophication
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Eutrophication – nutrient enrichment of waters Major nutrients - phosphorus and nitrogen Consequences - increased plant growth - decreased water quality
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Eutrophication of lakes, reservoirs and rivers ranks as one of the most widespread environmental problems. Eutrophication can have significant negative ecological, health, social and economic impacts on use of a primary and finite resource, water.
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Decreased water quality Algal blooms Decreased transparency DOC and chlorination disinfection products Toxic cyanobacteria and dinoflagellate Growth of aquatic plants Anoxia
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Effects of Eutrophication Source: Issues in Ecology #2 (1998)
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Laguna de Bay, Philippines
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US East Coast Source: Issues in Ecology #2 (1998)
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Decreased water quality Elevated nitrate concentrations Species changes Increased incidence of water-related diseases
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Positive features of eutrophication - increased fish yield - increased plant production and nutrient reuse
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Indicators of eutrophication Secchi disk transparency Chlorophyll concentration Phosphorus concentrations Nitrogen concentrations
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Effects of Eutrophication Source: Issues in Ecology #2 (1998)
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Source: Issues in Ecology #2 (1998)
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Source: Issues in Ecology #2 (1998)
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Classification of Lakes Source: Principles Env. Sci. & Eng. (Davis & Masten)
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Probable, not certain… Eutrophic Source: Principles Env. Sci. & Eng. (Davis & Masten)
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Total P vs. Chlorophyll a Source: Principles Env. Sci. & Eng. (Davis & Masten)
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Meybeck, 1982
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Is N or P limiting? – Assessment Concentration ratios Experimental enrichments Supply and recycling ratios Physiological assays
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