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Eutrophication

Eutrophication. Eutrophication. When it occurs naturally Bodies of water gradually age and become more productive. Takes thousands of years to develop. Today Overabundance of nutrients and wastes has increased this process at an alarming rate. Today’s Eutrophication.

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Eutrophication

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  1. Eutrophication

  2. Eutrophication • When it occurs naturally • Bodies of water gradually age and become more productive. • Takes thousands of years to develop. • Today • Overabundance of nutrients and wastes has increased this process at an alarming rate.

  3. Today’s Eutrophication • A condition in which an aquatic ecosystem contains a high nutrient concentration (mainly phosphorus, nitrogen and carbon nutrients), which stimulates blooms of algae to occur. • Overgrowth of algae blocks sunlight to reach aquatic plant species below this “carpet” of algae and die off. • Bacteria feed on dead matter and increase in number • This in turn causes oxygen depletion, and other aquatic species may be choked out (fish kills)

  4. How ? • Humans add excessive amounts of plant nutrients to streams and lakes in various ways. • Runoff from agricultural fields, field lots, urban lawns, and golf courses are a source for these nutrients. • Untreated, or partially-treated, domestic sewage is another major source.

  5. Eutrophication Project Set up

  6. Objectives • To observe the effect of three fertilizer concentrations on terrestrial plants, and aquatic environments. • To use this information for the Analysis of Eutrophication Project Data, and the Eutrophication Project Paper

  7. Your Assignment • Worth 50 points • Due April 16th • Have to meet all report requirements • Will take time • Start now, do not wait until you have 1 week left.

  8. To Do • Set up the terrestrial plant portion of the experiment • Observations of both environments will done weekly (Record on tables on pg 9 and 17) • Each bench will have an assigned duty and measurement to record. • Record soil and water quality pre-treatment data • Follow Eutrophication instructions from web site

  9. Terrestrial Bean plant (Vicia faba) 2 seeds 4 pots/treatment Fertilizer (liquid) Predetermined amount Potting Soil Standard commercial mix Lighting 16L:8D photoperiod Aquatic Algae (Oedogonium sp.) Three aquaria: Each has a pre-weighed amount of algae Covers allow fertilizer to drain in to each tank Access holes to retrieve water samples and conduct water quality measurements Set Up

  10. Treatments • Aquarium 1: No fertilizer (Control) • Aquarium 2: Low fertilizer (25% of recommended concentration) Aquarium 3: High fertilizer (100% of recommended concentration)

  11. Protocol • Planting (our lab) • 4pots/aquarium, 2 seeds/pot (thinned out later) • Pre-treatment (supervisor) • Soil quality (Nitrogen, Phosphorus, Potassium, and pH) • Water nutrients ( Nitrate, Nitrite, and Phosphorus) • Weekly • Adding fertilizer and watering (supervisor) • Plan height (our lab) • DO, conductivity, temperature, OD, pH (our lab) • Post-treatment • Soil quality and water nutrient final measurements (our lab)

  12. Paper Instructions

  13. Bench Duties

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  20. Bench Duties

  21. Next Lab • Water Quality Assessment II • Outdoors • Quiz # 2 • Review power points • Turn in Scientific article and worksheet • Need two citations minimum relevant to Eutrophication (use Galileo) • Print out Eutrophication instructions from web site

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