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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. - PowerPoint PPT Presentation
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Key Stages in the Life-History of a Plant
Growth
Flowering
Pollination
Seed Maturation
Dispersal
Dormancy
Germinationse
ed
ph
ase
Disperse How Far?
Near Parent
Advantages
• Parent habitat was good
Disadvantages• Direct competition with parent
• Strong sib competition
• Habitat may deteriorate
• Random disaster may strike
• Disease burden may increase
• Seedlings easily found by predators
Far From Parent
Advantages
• Parent habitat was good
Disadvantages
• No competition with parent
• Weak sib competition
• Escape from potentially deteriorating habitat
• Potential colonization of new area
• Potentially less disease burden
• Seedlings harder to find by predators
Seed Survivorship in a Tropical Tree:Cecropia peltata
Seed distribution
Probability of surviving
Surviving plants
Fleming and Williams 1990. Journal of Tropical Ecology 6:163-178
Key Stages in the Life-History of a Plant
Growth
Flowering
Pollination
Seed Maturation
Dispersal
Dormancy
Germinationse
ed
ph
ase
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
Numeric Status
Minneapolis/St. Paul
Alaska
Abundance
640,000
531,947
Area (sq. mi)
~70
591,000
Density
~9142
0.90