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Transcript
Populations
Video Objectives
- Describe typical population dynamics
- Explain how population sizes are regulated
Video Objectives
Population Dynamics
Population Dynamics
How is population regulated?
Population change is a result of:
Births + Immigration
Deaths + Emigration
-
Regulation
Population is regulated in 2 ways:
Biotic regulation
Abiotic regulation
Biotic Regulation
Predation and Competition
Disease
Abiotic Regulation
Drought/Famine
Fires/Disasters
Extreme weather
Summary
- Population is the number of individuals of one species in a given place and time.
- Population changes over time
Summary
- Change can be exponential if no limiting factors exist - this is rare.
- Logistic population growth plateaus at carrying capacity
- Populations are regulated by biotic and abiotic factors
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