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Chapter 52 - Population Ecology

Chapter 52 - Population Ecology - Chapter 52 Class Notes...

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Chapter 52 Class Notes – Population Ecology – Page 1 Max Sauberman AP Biology – Mr. Schilp Chapter 52 Population Ecology Earth’s Fluctuating Populations: To understand human population growth, we must consider general principles of population ecology. Population ecology is the study of populations in relation to environment, including environmental influences on density and distribution, age structure, and population size. The fur seal population of St. Paul Island off the coast of Alaska has experienced dramatic fluctuations in size. Thus, seal hunters will go to St. Paul Island, kill all the seals, further allowing population size to fluctuate. Dynamic biological processes influence population density, dispersion, and demography. A population is a group of individuals of a single species living in the same general area. Density and Dispersion: Density is the number of individuals per unit area or volume. Dispersion is the pattern of spacing among individuals within the boundaries of the population. Density: Determining the density of natural populations is difficult. In most cases, it is impractical or impossible to count all individuals in a population. Density is the result of an interplay between processes that add individuals to a population and those that remove individuals, like emigration or death. Patterns of Dispersion: Environmental and social factors influence spacing of individuals in a population. Clumped Dispersion: In clumped dispersion, individuals aggregate in patches. A clumped dispersion may be influenced by resource availability and behavior. For many animals like wolves, living in groups increases the effectiveness of hunting, spreads the work of protecting and caring for the young, and helps execute other individuals from their territory. Packs must mate with other packs to maintain genetic variability.
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Chapter 52 Class Notes – Population Ecology – Page 2 Uniform Dispersion: A uniform dispersion is one in which individuals are evenly distributed.
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