Biological communities. Limiting Factors Any biotic or abiotic factor that restricts an organism’s existence or reproduction Each species has a range.

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Presentation transcript:

biological communities

Limiting Factors Any biotic or abiotic factor that restricts an organism’s existence or reproduction Each species has a range of tolerance for each condition

Plants need everything in this barrel in order to grow. Which factor is limiting how much the plant can grow?

Succession = changes in a community over time Areas naturally change over time if left undisturbed Occurs in stages – takes a long time

Primary succession: starts with bare rock –Pioneer species like lichens grow on the rock and start to break it down into soil –Soil sits in crevices on rocks and small plants start to grow there –Plant growth/death aids in breakdown of rock to make more soil –Eventually results in a climax community where little chance is taking place anymore

Secondary succession: results from a natural disaster or from human activity –does not start with bare soil Some seeds still present, some species still living Takes less time than primary succession