What Regulates Population Growth? Abiotic: Physical Factors Biotic: Density-Dependence Density-Vague Regulation.

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Presentation transcript:

What Regulates Population Growth? Abiotic: Physical Factors Biotic: Density-Dependence Density-Vague Regulation

Discrete Generation Growth ModelCharacteristic 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