4763669
Description
Mind Map by Jack Willepotte, updated more than 1 year ago
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Created by Jack Willepotte
over 9 years ago
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Distribution of
Organisms and
Environment
- organisms live in
different places because
environment varies
- distribution of an organism
is where it is found many
factors affect where an
organism is found
- - Temperature - Availability
of water - Availability of
oxygen and CO2 -
Availability of nutrients -
Amount of light
- These may mean an organism may be
common in certain areas and less common
in other areas E.G daisies in middle of field
and none under the trees due to light levels
- to study the distribution of organisms you
could use quadrats in two areas then compare
them or study how the oranisms' distribution
changes by placing quadrats along a transect.
- Quadrats: study the
distribution of small
organisms
- basically place a quadrat in a
random area (usually 1M
squared) and count the
organisms inside that
quadrat.
- basically place a quadrat in a
random area (usually 1M
squared) and count the
organisms inside that
quadrat.
- Transects: study
distribution of organisms
along a line
- For example to see if a plant becomes
less common as you move from a
hedge to the middle of the field
- to do this you can simply
measure a line using a tape
measure then count the
number of organisms which
touch that line( which
you're interested in) or use
quadrats which can be
placed next to each other
on the line or at intervals
- to do this you can simply
measure a line using a tape
measure then count the
number of organisms which
touch that line( which
you're interested in) or use
quadrats which can be
placed next to each other
on the line or at intervals
- For example to see if a plant becomes
less common as you move from a
hedge to the middle of the field
- Quadrats: study the
distribution of small
organisms
- to study the distribution of organisms you
could use quadrats in two areas then compare
them or study how the oranisms' distribution
changes by placing quadrats along a transect.
- These may mean an organism may be
common in certain areas and less common
in other areas E.G daisies in middle of field
and none under the trees due to light levels
- - Temperature - Availability
of water - Availability of
oxygen and CO2 -
Availability of nutrients -
Amount of light
- distribution of an organism
is where it is found many
factors affect where an
organism is found
- work out population
size multiply mean
number of organisms
per quadrat by the
total area the
quadrats covered
- when collecting environmental data
- Reliability
- Quadarts and
Transects are good
tools
- but the results
must be reliable
and reproducible
- larger sample size is
better in terms of
reliable results and
reproducible results
- larger sample size is
better in terms of
reliable results and
reproducible results
- but the results
must be reliable
and reproducible
- Quadarts and
Transects are good
tools
- Validity
- to be valid results
must be reliable
- all variables need to
be controlled
- the real question is
whether a
difference in
distribution is due
to only 1
environmental
factor
- random samples
improve validity
- random samples
improve validity
- the real question is
whether a
difference in
distribution is due
to only 1
environmental
factor
- all variables need to
be controlled
- to be valid results
must be reliable
- Reliability
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