The living world: Ecosystems - Changes Affecting Ecosystems Flashcards

1
Q

Changes affecting ecosystems:

A

Ecosystems take hundreds of years to develop. Ecosystems need to be in balance, if there is a change to one of the components, it may well affect the rest of the ecosystem.

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2
Q

Causes of change:

A
  • global scale changes, such as climate change.

- local scale change, such as changes to a habitat – e.g. when a hedge is removed.

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3
Q

Natural changes:

A

Extreme weather events like droughts can be devastating to ponds and lakes.
Plants will dry out and die.
Fish starved of oxygen might not survive.

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4
Q

Human changes:

A

Changing one component has been changed it can have serious knock-on effects on the ecosystem:

  • agricultural fertilisers can lead to eutrophication.
  • ponds may be drained to use for farming.
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