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3.1 How Changes Occur Naturally in Ecosystems
Transcript of 3.1 How Changes Occur Naturally in Ecosystems
Living organisms have an incredible ability to adapt to change.
This is the basis for
In natural selection, the best-adapted members of a species will survive and reproduce.
These changes are
SUCCESION and they
can occur in two ways.
These individuals then pass along the favorable characteristics to their offspring
This is the basis for Adaptive radiation
The most famous example of natural
selection are the 13 species of finches
inhabiting the Galapagos Islands
Primary succession occurs in an
area where no soil exists, such
as on bare rock.
Wind and rain can carry spores of lichens and other
organisms to these rocks.
These organisms are called
Lichen, weathering and decay cause the
the rock to break down and form soil
This may take 100's of years
The soil allows moss and other plants
to take over this nutrient poor soil.
The result of a succesful primary
succession is a climax community
Secondary succession occurs in an area
where there was once soil but a disturbance
has caused the loss of the living organisms
Secondary succession occurs much
faster than primary
There are several causes of
Read pages 108 - 117
Do questions 1-12 page 121
A great example is Mt St Helens
There can also be change
to entire ecosystems