Changing Ecosystems Flashcards

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1
Q

Explain the concept of ecological succession.

A

Ecological succession is a natural process of progressive change in an ecological community as a result of interaction between biotic and abiotic factors over time. Overtime, a series of communities (seres) form taking over the previous ones until a stable community is formed (climax community).

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2
Q

Contrast primary and secondary succession.

A

Primary succession refers to the introduction of organisms into areas that have not previously been colonised whereas secondary succession refers to the re-introduction of organisms into a bare habitat, previously occupied by plants and animals. Secondary succession is usually faster.

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3
Q

Why are pioneer species effective colonisers?

A

-They have the ability to fixate nitrogen (will allow plants to grow)
-Tolerance to extreme conditions
-Rapid germination of seeds
-Ability to photosynthesise efficiently

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