Bio36_04_PopCom - Overview Register your ResponseCard RF if...

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1 Overview • Register your ResponseCard RF if not previously registered – Dynamics of Natural Populations – Limits on Populations – Community Interactions – Evolution – Human Management Dynamics of Natural Populations • Population growth curves – Exponential increase b population explosion J -curve – Logistic growth •Carrying capacity (K) S -curve • Biotic potential (r) – Population growth under ideal conditions • Environmental resistance – Limits to population increase Reproductive Strategies r -strategists – Opportunistic species K -strategists – Equilibrial species • Life history – Survivorship curves •Type I •Type II •Type III Limits on Populations • Density-dependent factors as population – Population regulation b logistic growth •Top-down control (predation) •Bottom-up control (food scarcity) • Density-independent factors – Not related to population size – E.g., natural disasters • Critical number – # necessary for population survival – Threatened species •Rapidly declining pop. – Endangered species
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Bio36_04_PopCom - Overview Register your ResponseCard RF if...

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