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BIOL211#24 - Chapter 56 A population is a group of...

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1 Chapter 56 Population Ecology A population is a group of interbreeding individuals occupying the same area at the same time Boundaries may be difficult to define Members rely on the same resources and are influenced by similar environmental factors Population ecology The study of what factors affect population size and how these factors change over space and time Demography The study of birth rates, death rates, age distributions, and the sizes of populations Understanding Populations Characteristics of a population Density Dispersion Reproductive strategies Age classes Density is the number of individuals per unit area or volume Determining the density of a population is extremely difficult Sampling methods Random sampling of a subpopulation Mark-recapture Sampling methods Quadrat Pitfall Trap Mist Net Figure 56.1
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2 Sampling methods Mark-Recapture Figure 56.2 Density is not a static property Additions Birth Immigration Deletions Death Emigration Dispersion is the pattern of spacing among individuals within the boundaries of the population Clumped dispersion Individuals aggregate in patches Influenced by resource availability and behavior Figure 56.3 Uniform dispersion Individuals are evenly spaced Influenced by social interactions such as
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