BIOL 2Q04 Lecture Notes - Lecture 2: Competitive Exclusion Principle, Clearcutting, Glacier Bay National Park And Preserve
28 Jul 2015
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Primary: site previously unoccupied by a community process of weathering of rock with gradually colonization of pioneer plants which transform the soil we have to start from scratch. Can be from rock outcrops and cliffs, sand dunes that come from sand deposits, newly exposed glacial till. Secondary: previously occupied (vegetated) sites after disturbance (floods, hurricanes, fires) we already had something here and now we are rebuilding thus it takes less time than primary. It can start with the same forest we just saw in primary; it starts with a disaster that destroys the surface invasive plants (weeds) grow back first. Old field communities commonly occur in the eastern us and represent the early stages of secondary succession these start from abandonment of the land *read various examples in text. Rhizophytic macroalgae: contribute to sediment they deposit on this new area and accumulate forming a layer. Halodule wrightii colonizes: stabilizes the sediment surface more filamentous (ex.
