Light intensity :- this is the amount of light in the environment.
It is measured with a
light meter similar to that
used with a camera.
Ph :- This is a measure of the acidity of the soil.It is measured
with Ph paper.Acid turns pH paper red .The soil in high rainfall
areas tends to be acidic.Plants like rhododendrons and azaleas
grow in this type of soil.
Water flow rate :- this tells us the flow rate of moving water.We can
measure this by using a cork and seeing how fast it flows in a stream.
These animals have streamlined bodies to cope with the
fast moving streams.They are shown on the next slide.Take a note
of their names.
Water flow rate cont`d
The animals shown on the next slide can survive in more still waters.
Wind flow rate :- this tells about how fast the wind is flowing in a
particular area.It is measured with a wind speed gauge.Some trees
become windswept and indeed in windy conditions,some trees
will not grow at all.
Within each habitat , we find populations of different living things.
A population is the number of a particular species in a certain area.
For example we may have a local magpie population.
Climate affects populations , for example the Osprey shown below
migrate to Africa in the winter to return to breed in the spring.
POPULATION CHANGE FACTORS AFFECTING CHANGE
1. Predators during the 1970`s huge numbers of ladybirds appeared.
2. This was because of a large greenfly population increase.
3. This made more food available for the ladybirds which grew in number.
Competition for space
1. Ladybird overcrowding was so bad that in some places they covered the ground