Thursday, October 25, 2007

Community Ecology: Part III


Today's lesson was on ECOLOGICAL SUCCESSION... and it's outcomes.

What is ecological succession??? Well it is a "sequence of community changes."
Yeah... but what does that mean . It means that the ecology of a community changes to maintain the balance and success. It is the transition in species composition over time (may be years or even decades). Species composition refers to the contribution of plant species in a certain area. Most of the time this is caused by a disturbance in the area.

There are two types of ecological succession: Primary succession and Secondary succession.

Primary Succession
Primary Succession begins on plain lifeless land without soil...
What happens next...
1. Bacteria moves in and by definition of what they do, they turn the dirt into soil. Land with nutrient and land able to support some sort of living matter besides bacteria.
2. Lichen and mosses move in and begin to grow. They use the nutrient from the soil to support themselves.
3. Grasses are then able to move in by the seeds that come in from adjacent communities.

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