what regulates population growth? abiotic: physical factors biotic: density-dependence density-vague...
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What Regulates Population Growth?
Abiotic: Physical Factors
Biotic: Density-Dependence
Density-Vague Regulation
Discrete Generation Growth
Model Characteristic
Density-Independent
Geometric Growth
Density-Independent
Geometric Mean Growth
Density-Dependent Growth
Biotic Regulation
• Density-Dependence
• Individual-Level, Birth and Death– Depends on Population Size
• Driven by Ecological Interactions
Self-Regulation
• Species Growth Responds to Own Density
• Intra-specific Competition
• Limiting resource(s)
dN/dt = F(N) N
Glycine soja (soy bean)
Tribolium confusum (flour beetle)
“ – 3/2 Rule”
Drosophila melanogaster
Melospiza melodia (song sparrow)Seed Production
Logistic Growth
Brewer’s yeast
Tasmanian sheep
References
• http://jan.ucc.nau.edu/~doetqp-p/courses/env470/Lectures
• http://www.micro.utexas.edu/courses/levin/bio304
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