BIOL 2Q04 Lecture Notes - Lecture 17: Glacier Bay National Park And Preserve, Volcanic Gas, Community Structure
2 Dec 2015
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Document Summary
Ecological community= set of plant and animal species that occupy an are. Community= a group of species that occupy a given area, interacting either directly or indirectly. More restrictive definition= a subset of species (e. g. as a plant, bird, small mammal etc. ) Gradual and (seemingly) directional change in community structure through time from field to forest. Process of weathering of rock with gradually colonization of pioneer plants which transform the soil. 1980, 400m was blown off the cone of the volcano. 3m wide arc of the crater were devastated o. Blast zone- trees and vegetation were blown down but not killed. Pyroclastic flows- volcanic gas, pumice and ash- vegetation killed north of the crater. Extensive mudflows and ash deposits south, east and west- intense drought, limited nutrients, erosion= no vegetation. Recovery from a disturbance which can include: o o. Old field communities commonly occur in the eastern united states and.
