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Chapter 54.doc

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Biology (Sci)
BIOL 467
Imad Mansour

Chapter 54Population Ecology541 How Do Ecologists Study PopulationsA population consists of the individuals of species within a given areaThe members of a population are distributed over space and they differ in age and sizeThe age distribution of individuals are spread over the environment describe its population structureThe number of individuals of a population per unit of area is its population densityThe structure of a population changes continually because demographic events are common occurrencesPopulation densities can be estimated from samplesEstimating population densities is easiest for sedentary organismsCounting mobile organisms is much more difficult because individuals move into and out of census area write equation hereBirth and death rates can be estimated from population density dataWrite equation hereIndividuals born at the same time cohortThe number of a population still alive at a given period of time in the futuresurvivorship542 How Do Ecological Conditions Affect Life HistoriesAn organisms life history describes how it allocates its time and energy among the various activities that occupy its lifeEcological interactions influence the e
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