What is Eutrophication?
-mineral ions from organic fertilisers dissolve in rainwater and leach out of the soil
-Nitrates leach into rivers
-algae grows and blooms because there are more nitrates to make protein
-Algal bloom cuts off light to algae + rivers below so they can't PHS and die
-Bacterial decomposer pop inc. they use O2 up in respiration
-Fish and invertebrates don't have enough O2 to respire+die
What effect does inorganic fertilisers have on eutrophication and why?
-inc of nitrates conc, more nitrates leach into rivers
-algae rate of growth inc + forms algal bloom, because more nitrates to make protein
-this leads to plants below algal blloms to not have enough light for PHS and die
-Bacterial decomposer pop inc, they use up o2 in respiration
-this leads to fish and invertebrates not having enough o2 to respire+die
Why is sewage treatment important in reducing Eutrophication
-Important because decomposers decompose amino acds to ammonia (eg fungi)
-Ammonia converted to NItrites to Nitrates by Nitrifying bacteria
-Inc conc ofNitrates leads to eutrophication as algae have more Nitrates to make protein
Name as least 3 sources of Nitrogen to aquatic environments that can cause Eutrophication
-Acid rain (NO in rain)/detergents
-Inorganic and Organic Fertilisers
Explain why sewage outlets in rivers can result in the death of fish?
-Sewage provides nutrients for bacterial growth
-Bacterial pop inc.
-bacteria decompose and respire
-use up o2 = o2 depletion
-not enough o2 for fish to respire and they die
-sewage can also lead to eutrophication which can also result in the death of fish