Describe the general types of environmental change that occur during succession. Predict changes in the distribution of biomes that might occur as a result of an increase in global temperature brought on by an increase in the concentration of greenhouse gasses in the atmosphere. A community that remains fairly constant in species composition if the ecosystem is undisturbed. These are the communities that characterize the various biomes. The first species to colonize an area following a disturbance.
Primary succession is essentially the same thing as soil formation in terrestrial systems.
There is no community because there is no soil. In primary succession the initial organic matter is added to the mineral substrate by the pioneer plants. Pioneer plants become established on the bare mineral substrate from spores, seeds, or other propagules that are blown, washed, or caried in by animals. Examples of Primary Succession See page 856, text Primary succession on bare rock. Volcanic eruption is primary succession.