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4.4 water pollution - Coggle Diagram
4.4 water pollution
sources
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possible effects
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distruptions to breeding grounds, nest site
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BOD (biochemical oxygen demand)
-measure amount of dissolved oxygen (DO) required to break down organic material
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steps measure BOD
measure DO level immediately (1st,
incubate in dark space at 20degreeC for 5 days (2nd)
re measure (2nd) sample DO level ,
repeat after suitable time frame
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eutrophication
+ve feedback
- algal block light - death of plant ( more nutrient)
- more growth of algal - divert from equilibrium
- increase bacteria feeding on dead remains
- increase BOD decrease DO ,
- lead to high BOD, divert from equilibrium
- more nutrient more algal growth.
- dead & decomposed algal increase nutrients
- divert further from equilibrium
-ve feedback
- rise in species feed on increasing algal
(algal decrease)
- equilibrium restored
-high dead organism increase decomposers
- lead to decrease organic matter- restore equilibrium
- increase nutrient increase biomass (nutrient uptake by plant)
- reduction in nutrient- restore equilibrium