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Ecological succession is the sequence of community changes after a disturbance • Ecological succession is ... • Two kinds of Succession: Primary & Secondary • Primary succession is… • The first colonizers are: • An example after a glacier or volcanic rock. • Next, grasses and small plants move in and take over the scant soil. Their death adds to the soil. • Next shrubs and pioneer tree species move into the area. Outgrow earlier species & add to the soil. • Next intermediate species (Doug fir) move in. Add to soil, retain moisture, but shade the forest floor. • Lastly, climax species grow in forest shade supplanting earlier species (Western hemlock, & W. red cedar). • Secondary succession is: • Grasses grow first, then trees and other organisms. • More than just communities change w/ succession, other factors also change, soil nutrients dramatically change over time. Ecological succession in Glacier Bay
