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Key Stages in the Life-History of a Plant

Seed Maturation. Growth. Key Stages in the Life-History of a Plant. Dispersal. Flowering. seed phase. Dormancy. Pollination. Germination. Hitch-hikers. Dispersal by Frugivores. Disperse How Far?. Near Parent. Far From Parent. Advantages. Advantages. No competition with parent.

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Key Stages in the Life-History of a Plant

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  1. Seed Maturation Growth Key Stages in the Life-History of a Plant Dispersal Flowering seed phase Dormancy Pollination Germination

  2. Hitch-hikers

  3. Dispersal by Frugivores

  4. Disperse How Far? Near Parent Far From Parent Advantages Advantages • No competition with parent • Parent habitat was good • Weak sib competition Disadvantages • Escape from potentially deteriorating habitat • Direct competition with parent • Strong sib competition • Potential colonization of new area • Habitat may deteriorate • Potentially less disease burden • Random disaster may strike • Seedlings harder to find by predators • Disease burden may increase Disadvantages • Seedlings easily found by predators • Parent habitat was good

  5. Janzen-Connell Hypothesis Seed distribution Probability of escaping predation Surviving plants

  6. Seed Survivorship in a Tropical Tree:Cecropia peltata Seed distribution Probability of surviving Surviving plants Fleming and Williams 1990. Journal of Tropical Ecology6:163-178

  7. Seed Maturation Growth Key Stages in the Life-History of a Plant Dispersal Flowering seed phase Dormancy Pollination Germination

  8. Seed Dormancy: Dispersal in Time Ambrosia artemisifolia: a summer annual

  9. Seed Dormancy: Dispersal in Time Patterns of dormancy as a function of local environment

  10. Seed Dormancy: Dispersal in Time (1) A mechanism for timing germination when conditions are favorable for seedling survival (2) A tactic for dealing with environmental uncertainty

  11. The Ecology of Seed Banks

  12. Serotinous cones: an above ground seed bank

  13. End of Material covered on Exam #1!

  14. Plant Population Ecology

  15. What is a population? “A collection of individuals of the same species living in the same area”

  16. What we define to be a population is often context dependent

  17. Static Measures of Population Structure

  18. Numeric Status Area (sq. mi) ~70 591,000 Abundance 640,000 531,947 Density ~9142 0.90 Minneapolis/St. Paul Alaska

  19. Population Density • Scale independent • Can be used to estimate numbers for areas of different size Only true if individuals are distributed at random, with the same intensity over the entire study area

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