33_Population_structure

33_Population_structure - Can only breed in meadows with...

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Population Structure Today’s questions: I. How does age structure affect population ynamics? dynamics? II. How does geographic structure affect opulation dynamics? population dynamics? III. What regulates populations?
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I. How does age structure affect population dynamics? Using population pyramids to characterize age structure nd assess prospects for population growth. and assess prospects for population growth. Assess: Relative number of newly born/hatched/germinated Relative number approaching or at peak reproductive age elative number of old/post productive Relative number of old/post reproductive
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There are three basic patterns. Data from human opulations populations.
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What do you notice about these graphs?
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II. How does geographic structure affect population dynamics? ange maps in books: Actual: Range maps in books:
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Metapopulation = a population of populations e.g. Glanville fritillaries in Åland islands of Finland
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Unformatted text preview: Can only breed in meadows with certain host plants (larvae eat leaves) How do metapopulations work? Census: Mark individuals; later in season, re ‐ capture nd new patch Find % in new patch Census 2 years later: some populations gone, other abitats habitats Punchlines: Humans are fragmenting habitats and forcing many populations into a metapopulation structure. How will this affect: breeding? • Inbreeding? • Genetic drift? • Geographic range changes in response to climate change? III. What regulates populations? What factors are important in controlling population size? • Western bluebirds: • Elk, California mussels: • Red grouse: • Snowshoe hares (from book): • Humans (historically, currently): Is the human population at or near carrying capacity?...
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33_Population_structure - Can only breed in meadows with...

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