plant population ecology - wouguralnl/gural/454plant population...• population density usually not...
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Plant Population Ecology• Populations • Measuring Plant
density• Population growth
models
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Population
• Population = group of individuals of a species with the potential to interbreed in a defined geographic region
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Population• What is an individual? • Branches (modular units) • genets = sexual reproduction, genetically distinct
individuals• ramets = asexual reproduction, tillers , runners; can be
physiologically distinct
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Opuntia fulgida
• Clonal fragmentation• ramets
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Measuring Plant density
• #'s / unit area, volume, diameter at breast height
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Plant structure problems
• seed pool • age structure • age of reproduction • population density usually not static
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Population structure
Age vs stage in plants
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Population growth models
• Exponential growth model
• birth and death rates • immigration/emigratio
n • dN/dt = rN• assume I and E are 0 • examples of
exponential growth
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Exponential growth
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Logistic growth model• actual populations
plateau • carrying capacity • dN/dt = rN (K-N/K) • different types of logistic
growth curves • growth rates differ in
different phases • Overshoot K • K dependent on resource
availability
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Growth rates
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Logistic growth
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Random variation in Population growth and decline
• Hurricanes• Fire• Pests
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Matrix models
• Transition Matrix • calculation of plant
populations • matrix multiplication
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Multiplication
• Row X column• Sum of result• Gives new column matrix
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Stable age structure