Environments

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environments

environmental factors

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.

Slide 19

environments

Environmental factors

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.

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environments

environmental factors

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.

Slide 21

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environments

environmental factors

Water flow rate cont`d

The animals shown on the next slide can survive in more still waters.

Slide 23

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environments

environmental factors

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.

Slide 25

environments

Population change

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.

Slide 26

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.

Slide 27

Factors affecting change

Competition for space

1. Ladybird overcrowding was so bad that in some places they covered the ground

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