20.Human influences on Ecosystems Flashcards

Part 2:Pollution and Conservation

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1
Q

Describe the effects of :

a) Untreated sewage on aquatic ecosystems

A
  1. Provides a good source of food for bacteria and they reproduce rapidly
  2. Bacteria respire aerobically and deplete oxygen
  3. Aquatic organisms such as fish die of suffocation-Eutrophication
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2
Q

b) Fertilisers on aquatic ecosystems

A
  1. Causes rapid growth of algae which then die
  2. Decomposing bacteria feed on algae
  3. Oxygen is depleted and aquatic organisms die-Eutrophication
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3
Q

c)Heavy metals

A

Heavy metals do not break down and so bioaccumulate in food chains
This cause food poisoning to top carnivores.

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4
Q
A
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