Eutrophication nutrient enrichment of waters

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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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Positive features of eutrophication -
increased fish yield - increased plant
production and nutrient reuse
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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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Algal bioassays addition of known quantities
of nutrients to algal suspensions and
measurement of physiological or ecological
responses
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Watershed factors which moderate degree of
eutrophication climate hydrology
biogeochemistry land use
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Within-lake factors which moderate degree of
eutrophication food web structure sediment
regeneration basin morphology hydrodynamics