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Unformatted text preview: 1 Population Ecology 1. Density, Dispersion and Demography 2. Life History Traits 3. Growth a) Exponential b) Logistic 4. Population-Limiting Factors 5. Human Population Growth Reading: Chapter 52 Examples of applications • Invasive species • Endangered species • Pest control (e.g., agriculture) • Human population growth Population : individuals of same species occupying the same general area • Density : the number of organisms in a given area (e.g. oak trees/km 2 ) • Dispersion : how the organisms are spaced in the area Aerial census for African buffalo in the Serengeti of East Africa. Births Immigration Deaths Emigration Population Size Additions Subtractions Changes in population size Growing Fig. 52.19 Fluctuating Shrinking Northern Pintail Duck Whooping Crane Population Ecology: Density, Dispersion and Demography Fig. 52.3 Clumped Random Uniform Patterns of dispersion within a population’s geographic range Eric Preston 2 Demography • Study of the statistics of populations and how they change over time Population Ecology: Density , Dispersion and Demography Focus is on birth rates and death rates . Life Table : Survival pattern of a population (Table 52.1) life history table Follow a cohort from birth until all are dead 1.000 0.386 0.197 0.106 0.054 0.029 0.014 0.008 0.006 0.002 Population Ecology: Density , Dispersion and Demography Survivorship Curves Fig. 52.5 Proportion or numbers in a cohort still alive at each age Fig. 52.4 Population Ecology: Density , Dispersion and Demography Reproduction Tables : Reproductive output of a cohort from birth until death (Table 52.2) 4-5 0.95 5.45 2.73 2.59 Population Ecology: Density , Dispersion and Demography 2. Life History Traits • Traits that affect an organism’s schedule of reproduction and survival • Basic variables: 1. When reproduction begins 2. How often the organism reproduces 3. How many offspring are produced each reproductive episode • How do we figure out growth rate for different populations?...
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This note was uploaded on 05/25/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.
- Spring '07