The sequence of changes initiated by disturbance.
A type of secondary succession that occurs when farmland is abandoned. When a farmer stops cultivating a field, grasses and weeds quickly grow and cover the abandoned land. Over time, taller plants (such as perennial grasses, shrubs, and trees) take over the area.
- Cultivation ceases, crabgrass dominates
- Crabgrass --> horseweed --> broomsege and other weeds --> pine trees --> hardwood trees
- North Carolina
- Then animals can come in and live
The set of communities that succeed one another over the course of succession at a given location. Each of these successional sequences is called a sere.
Example= Forest plot in southern Polan.
1-Forest plot cleared 2-(7yrs) low lying grasses grow 3-(15yrs) mix of grasses, ferns, and beginning small trees. 4-(30yrs) Skinny trees shade out small vegetation 5-(95yrs) medium sized trees 6-(150yrs) Large, thick forest,
One species is prevented from being established in an area simply by the presence of a different species.
A mature community, such as a boreal forest, tropical rainforest, grassland, or desert, that undergoes little or no change in species composition over time.
Community composition influence factors:
Ability of a species to withstand physical conditions of environment. Does not take community interactions into account (chicken can tolerate a particular sere, but then predator foxes will determine their position in community...).
development of communities in a lifeless area not recently inhabited by life (ex. lava flow, retreating glacier).
When one species increases the probability of another species being established.
Succession following a disturbance that destroys a community without destroying the soil. When a community regenerates following this disturbance.