BIOL 121 Lecture Notes - Lecture 6: Ecological Succession, Secondary Succession, Primary Succession

• School: UBC
• Department: Biology
• Course: BIOL 121
• Professor: Lynn Norman

Document Summary

Ecological succession : directional , predictable change in species composition of a community over time. 4 typically refers to plants succession starts w/ type of disturbance that results in an area becoming partially / compete ly devoid of vegetation disturbances : can be abiotic / biotic. Can vary in size / intensity large in scale ex . Volcanic eruption , flood , earthquake small : windstorm severe in impact ex . crown fire c trees burn ) moderate : ground fire. Abiotic ex . hurricane biotic ex , mountain pine beetle primary succession : sufficiently extreme to remove all the soil & living organisms follows a disturbance that was. In both types of succession pioneer species appear first leaky succession) Can live on bare rock , typically disperse through lichens : crucial pioneer species wind / water ex . as spores. Secrete acids that can break down rock. When they die , it becomes detritus.