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Shelter / a place to breed
( Warmth )
Sunlight…read more

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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 animals and plants that
live there are called an ecosystem
To study a ecosystem scientists have to develop methods
to estimate populations
Sampling methods
The size and distribution of a population can be measured by…read more

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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
ground that are used to catch small
insects e.g. beetles
Quadrats are square frames that have
sides 0.…read more

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When sampling, you must make sure you ...…read more

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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
Practical : Estimating the size of a bead population using
capture, mark and recapture
1. Fill a bucket or large tray with a large number of beads,
all the same colour and size
2. Capture a sample of about 50 beads
3.…read more

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The number of different organisms in a ecosystem is
called biodiversity
Natural ecosystem usually have a high biodiversity
Artificial ecosystems e.g.…read more


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