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  • AQA
  • A Level Biology
  • Unit 6 - Organisms respond to changes in their internal and external environments
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Summary Notes on Populations in ecosystems - AQA A Level Biology

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Populations in ecosystems – AQA A Level Biology Summary Notes

Definitions

Species
- A group of similar organisms that can reproduce to give fertile offspring


Population
- A group of organisms of the same/1 species living in a particular area at a certain time


Community
- All of the populations of a different species in an area


Biotic
- The living gators within an area
- Eg Competition between organisms of the same species (Intraspecific)


Abiotic
- The non-living factors within an area
- Eg temperature, soil, amount of rainfall, humidity, wind speed etc)


Competition
- The populations of all the different species in an area/habitat


Ecosystem
- All the organisms living in a community, plus the biotic and abiotic conditions in the area in
which they live


Climax Community
- Most complex community an ecosystem can support


Climatic Climax
- The Climax Community for a particular climate


Habitat
- Place where an organism lives within an ecosystem
- Each habitat has “microhabitats” – smaller sections within a habitat
- Eg grass is a microhabitat for bugs, water is a microhabitat for algae and mud at bottom for
blood worm

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Subject
A Level Biology
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September 8, 2023
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Summary
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  • aqa
  • a level
  • science
  • biology
  • bio
  • populations
  • ecosystems

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