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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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This note was uploaded on 01/06/2010 for the course EVE 101 taught by Professor Strong,d during the Spring '08 term at UC Davis.
- Spring '08