BIOL 121 Lecture : Biol 121- 2010.04.07- Ecology- Demograpy and Population Growth (Ch. 52).docx
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BIOL 121 Full Course Notes
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Population ecology is the study of how and why the number of individuals in a population change over time. A group of individuals of the same species that live in the same area at the same time. Individuals in one population tend to rely on the same resources (ie. food, water, nesting sites) Pattern of spacing in habitat (3): clumped (e. g. a few schools of fish, uniform (e. g. penguins, random (e. g. trees) Is the study of vital statistics that affect population size. Births, deaths, immigration and emigration (emigration is leaving) Count the whole population (most accurate but time consuming) Index of population size (indirect counting: e. g. count nests, burrows, droppings) Traps placed in study area, trapped animals are marked with tags bands or tracking devices. Then allow some time for them to mix randomly with the unmarked population. Recapture (set traps a second time) and look at the proportion of recaptured animals.
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