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Ecology

Organisms are found all over the planet
Each is adapted to suit the environment in which it lives ­
its habitat

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Habitats

Animals

Food
Shelter / a place to breed
( Warmth )
Water

Plants

Sunlight

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Water
Space

The number of the same organisms in a habitat us called
the population
The population of each organism is dependent on
competition and predator / prey relationships
All the other organisms in a habitat are interdependent
( depend on each other )

The habitat, its conditions, all the…

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They are used to collect insects in long grass or
moderately dense woodland where there are lots of shrubs

Pitfall traps

Pitfall traps are containers set into
the
ground that are used to catch small
insects e.g. beetles

Quadrats

Quadrats are square frames that have
sides 0.5 m long
You…

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Sampling

When sampling, you must make sure you ...

Take a big enough sample to make the results a good
estimate ­ the larger the sample the more accurate the
results

Sample randomly ­ the more random the sample the more
likely it is to be representative of the population

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Capture, mark and recapture

The previous methods are useful for estimating organisms
that don't move and very small organisms but a different
method is needed for larger animals that move around a
lot

Practical : Estimating the size of a bead population using
capture, mark and recapture

1. Fill a…

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Biodiversity

The number of different organisms in a ecosystem is
called biodiversity
Natural ecosystem usually have a high biodiversity
Artificial ecosystems e.g. farm field or gardens ect,
usually have a low biodiversity due to the use of weed
killers, pesticides and fertilisers
Organisms are identified using keyS

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