Ch19 Ecological Succession and Community Development4.pdf

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Spencer Barrett

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BIO120H © Li| Page 4011  tolerance and inhibition combine to influence the early stages of plant succession in old agricultural  first 3-4 years: species of crabgrass, horseweed, ragweed, aster, broomsedge replaced each other in rapid sequence (stress tolerant)  their indiv. life cycle determines its place in the successional seq.  crabgrass (rapidly growing annual) – prominent during year when field is abandoned  horseweed (winter annual; seeds germinate in autumn) – disperses well, develops rapidly, dominates 1yro fields, seedlings require full sunlight; quickly replaced by shade- tolerant species Henry J. Oosting Catherine Keever  early succession is dominated by tolerance (colonizing species disperse and cope w/ harsh conditions)  inhibition then comes into play  decaying horseweed roots stunt seedling growth (self- cologists in the field e limiting) – growth inhibitor; it is a by-product of adaptations that increase fitness during year 1 of succession  ragweed (summer annual) – dominates fields that are plowed under late autumn (instead of horseweed)  aster, broomsedge (biennials, germinate in spring and early
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