= Newly formed habitats, where there has never been a community before.
1. Pioneer species lichens & algae, first to colonise bare rock. Can cope with extreme conditions.
2. Pioneers breeak up rock surface= organic matter accumulate. Chanage conditions in habitat to make more suitable for other species.
3. Wind Blown moss spores start growing.
4. Mosses build up more organic matter= soil: can hold water.
5. Development of soil enables seeds of small, shallow rooted plants to establish.
6. Conditions in habitat improve, seeds from larger, taller plants appear.
7. Plants out compete existing community.
8. Eventually a stable climax community is reached, usually dominated by trees.
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