Ecosystems Summary

Summary of Ecosystems and Large Scale Biomes

For GCSE AQA Geography (A) - Living World

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  • Created by: Patrick I
  • Created on: 09-06-11 13:58
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Geography Revision Living World
ECOSYSTEMS
Ecosystem: A unit which includes all the living parts (e.g. plants & animals) and the non-living,
physical parts (e.g. soil and climate) in an area.
ORGANISMS OF AN ECOSYSTEM
PRODUCER ­ An organism which uses sunlight energy to produce food
CONSUMER ­ An organism which gets its energy from eating other organisms; either producers, other consumers, other both
DECOMPOSER ­ An organism which gets energy by breaking down dead material (e.g. dead producers, dead consumers, and
fallen leaves). Bacteria and fungi are decomposers
NUTRIENT CYCLE
INTERDEPENDENCE
Organisms within an ecosystem are dependent on each other ­ meaning the system as a whole is interdependent. Often a
change in on part will affect all other parts that depend on it. Examples within a small-scale hedgerow eco-system:
Even small changes can build up thorugh levels of dependence, and generally changes affect high level consumers the most.

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Geography Revision Living World
LARGE SCALE ECOSYSTEMS [BIOMES]
TROPICAL RAINFOREST
LOCATION
Between tropics of Cancer and Capricorn: Central America, North-East Southern America (Amazon), Central Africa, South-East
Asia.
CLIMATE
Hot, wet, rain almost every day, limited seasonal variation
SOIL
Low levels of nutrients in soil, all stored in the vegetation. When a tree dies, all of the nutrients are decomposed quickly (due
to hot, damp conditions), and used by other plants. Very thin surface leaf layer as a result, and so heavy rain washes nutrients
away.…read more

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Geography Revision Living World
VEGETATION STRUCTURE
Plant growth is sparse due to lack of rainfall. Only very robust plants such as cacti and thorn bushes can grow, as they have
adapted.
PLANT ADAPTATIONS
Extremely long plant roots in order to reach the deep water supplies OR Widespread roots near the surface, to catch
as much water as possible when it rains.…read more

Comments

Mr A Gibson

A precise and concise document with three useful pages of information. Print these off for you revision folder.

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