Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Succession
Document related concepts
Island restoration wikipedia , lookup
Introduced species wikipedia , lookup
Habitat conservation wikipedia , lookup
Biological Dynamics of Forest Fragments Project wikipedia , lookup
Conservation agriculture wikipedia , lookup
Biodiversity action plan wikipedia , lookup
Reconciliation ecology wikipedia , lookup
Theoretical ecology wikipedia , lookup
Latitudinal gradients in species diversity wikipedia , lookup
Transcript
Succession PAGES 407-410 Disturbance •Events that change communities by removing or destroying organisms • Abiotic examples: droughts, fires, floods, etc. • Biotic examples: elephants tearing up trees, prairie dogs moving soil for burrows, etc • Human examples: bulldozing, paving, etc Stability •Ability to withstand a disturbance and maintain constant conditions • The more species richness and evenness in an area, the more stability a community shows Ecological Succession •Sequential and gradual growth of a community Succession •Primary succession: occurs when a community is first formed (moving/melting glaciers, area covered by lava, rocky outcropping, sand dunes, etc.) • Occurs on bare rock •Pioneer species are the first to colonize the area • Microbes, lichens, and mosses must break down rocks into soil before other organism can grow Succession •The community continues to change until a climax community is reached •Climax community: marked by the domination of long-lived species and great diversity Succession •Secondary succession: occurs when succession must start over after the destruction of a climax community (forest fire, logging, farming, etc.) • First the area will be settled by pioneer species, usually small herbs, and will eventually become a climax community Example: 1980 eruption of Mt. Saint Helens Before the eruption During and after the eruption Succession Today
