1. Point source or non-point source pollution?
Eutrophication
Definition:
The rapid growth of plants which reduce oxygen supply in water, caused by excess nutrients
Causes:
Nitrates from fertilisers applied to surrounding arable land
Phosphates from animal slurry
Phosphates from sewage effluent from settlements and holiday centres
Point source or non-point source pollution?

5. Effects of Eutrophication

6. Ecological Impacts
What role do positive feedback mechanisms play in the process of eutrophication?
Explain why eutrophication can have the following ecological impacts:
death of aerobic organisms
(invertebrates, fish, amphibians)
increased turbidity (cloudiness)
loss of macrophytes
(emergent, submergent or floating aquatic plants)
shortening of food chains
loss of species diversity

7. Tackling Eutrophication
Dredging out algal mud
Damming small broads to prevent pollution from main broads and rivers
Extracting more phosphates at sewage treatment works
Grants to farmers to recreate traditional grazing lands, with limited/no fertiliser application

8. MANAGEMENT of EUTROPHICATION
Pollution management can be considered using three broad strategies:
replace (with alternatives)
regulate (the release)
restore (the environment)
Factors such as culture, politics and economics influence strategies used to manage pollution.
Case Study:
Norfolk Broads, UK

9. Effects on Norfolk Broads:

10. Strategies specific to tackling eutrophication