Eutrophication

Eutrophic waters, algal bloom and fish kill in fish farming areas in Bolinao, Pangasinan, PhilippinesMaria Lourdes San Diego-McGlone Rhodora V. Azanza, Cesar L. Villanoy,

Marine Science Institute1, University of the Philippines, Diliman, Quezon City 1101, Philippines

Abstract

The coastal waters of Bolinao, Pangasinan, Philippines experienced environmental changes over a 10-year period (1995–2005), the most significant effect of which was the major fish kill event in 2002 that coincided with the first reported Philippine bloom of a dinoflagellate Prorocentrum minimum.

Mariculture activities release organic matter from unconsumed feed and fecal material that accumulate in the water and sediments. In over 10 years, water quality conditions have become eutrophic with ammonia increasing by 56%, nitrite by 35%, nitrate by 90%, and phosphate by 67%. The addition of more fish pens and cages placed additional stress to this poorly flushed, shallow area that affected water quality due to changes in the water residence time.

1. What is it?2. How can it occur naturally?3. Where do the nitrates and phosphates come from in

anthropogenic cases?4. Are these point or non-point sources or both? Explain how.5. Draw a flow chart to show how eutrophication happens.6. What are the effects of eutrophication?7. What solutions can be put into place to prevent this pollution:

altering human behaviour, regulating pollutants at point of emission and clean-up and restoration?

You must be able to answer these:

http://www.youtube.com/watch?v=UGqZsSuG7ao causes

http://www.youtube.com/watch?v=cDhmtQUWS8I

http://www.youtube.com/watch?v=mCrudYcq_mo&NR=1

http://www.youtube.com/watch?v=9HmkfbUI-AA solutions

Make your own youtube clip – 3-6 minutes covering what you need to understand about eutrophication

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