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Unformatted text preview: Succession 2 2 July 1 Succession temporal change in community composition Primary Succession begins on bare rock or sand (no soil) Secondary Succession begins on soil Glacial Moraines in Southeast Alaska Glacial Moraines in Southeast Alaska primary succession primary succession Glacier 50 25 5 Years uncovered Spruce and Hemlock trees 50- Alder trees 10-50 Willows and Cottonwoods 4-10 Mosses, Weeds 1-3 Predominant plants Years final stage Most studies are on plants Old Fields in North Carolina Old Fields in North Carolina secondary succession secondary succession Succession of plants on abandoned farmlands 50- 5-50 3 2 1 <1 Predominant plants Years Crabgrass Horseweed-Ragweed Aster-Ragweed Broomsedge Pine trees Oak and Hickory trees Succession 2 2 July 2 General Patterns General Patterns Life history characteristics of early and late-successional plants Dispersal ability Mature size Structural strength Life span Seeds Drought tolerance Shade tolerance Growth rate Late Early Trait Early = r-selected species Late = K-selected species Biomass and Productivity Biomass and Productivity A m o u n t P r o d u c t i v i t y / B i o m a s s Concepts of Communities and Succession Concepts of Communities and Succession Superorganism Hypothesis (Clements) (Clements) Classic Theory Classic Theory Productivity Biomass communities are fundamental units of highly integrated species succession proceeds in a predetermined sequence toward the climax, analogous to development from an embryo into an adult...
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- Spring '08