8-EcologyIII-Comm-53+54-S08

8-EcologyIII-Comm-53+54-S08 - 2/20/2008 1 Community Ecology...

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Unformatted text preview: 2/20/2008 1 Community Ecology & Ecosystems with a little left over population ecology Community Ecology & Ecosystems with a little left over population ecology Population ecology Population ecology Question: Can the density of organisms influence their population size? Figure 52.13 Graphic model showing how equilibrium may be determined for population density Figure 52.14 Decreased fecundity at high population densities 2/20/2008 2 Figure 52.15 Decreased survivorship at high population densities Figure 52.19 Population cycles in the snowshoe hare and lynx Population ecology Population ecology Abiotic factors that do not depend on density of the pop. Aff ts ll p p l ti ns dl ss f Density independent controls: Affects all populations regardless of density Exp/ Weather, climate, freezes, hurricanes, storms Not a negative feedback (WHY?) Population ecology Population ecology Question: How might age structure effect a populations growth or decline? 2/20/2008 3 Figure 52.21 Figure 52....
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This note was uploaded on 05/18/2008 for the course BIOL 211B taught by Professor Lowe/zahn during the Spring '08 term at CSU Long Beach.

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8-EcologyIII-Comm-53+54-S08 - 2/20/2008 1 Community Ecology...

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