BIOB50H3 Lecture 18: Lec-18-Ecological-Succession
4 Nov 2016
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Document Summary
Succession: the non-seasonal, directional and continuous pattern of species colonization and extinction over time at a given site. The trajectory of a community over time: 1o succession: the colonization of new, barren sites that are the result of geologic processes (glaciers, volcanoes, new islands) Starts the ecosystem brand-new, no soil, short process, pionees species start habitat. Barren sites, ridiculous disturbance that completely creates a brand new environment, low biomass: 2o succession: the re-colonization of sites that were previously inhabited but disturbed (removal or biomass fires, flood, etc). Continuous ecosystem, pre-existing soil, started by a certain event, long process, population of species is introduced to establish the ecosystem. Abiotic and biotic agents of stress, disturbance and change in communities (secondary. Waves, currents (storms, hurricanes, floods, tsunamis, ocean upwelling) Wind (storms, tornadoes, hurricanes, wind-driven sediment storms) Chemical composition (pollution, acid rain, high/low salinity, high/low nutrient supply) Volcanic activity (lava, hot gases, mudslides, floods, flying debris)
