chapter 40 edited - Population Ecology Chapter 40 Easter...

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Population Ecology Chapter 40
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Easter Island
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40.1 Populations Population A group of individuals of the same species Population growth is affected by demographics Population size Population density Population distribution Age structure
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Three Patterns of Population Distribution Clumped , uniform , or random Most populations in nature have a clumped distribution pattern
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40.2 Population Counts Counting the number of individuals in quadrats estimates the density of a population in a specified area Capture-recapture methods estimate the population density for mobile animals
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Population Counts
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Key Concepts: THE VITAL STATISTICS Ecologists explain population growth in terms of population size, density, distribution, and number of individuals in different age categories They have methods of estimating population size and density in the field
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40.3 Population Size Many factors affect population size Immigration and emigration Birth and death rates Biotic potential Maximum possible per capita rate of increase for a species
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Growth Rates Per capita growth rate ( r ) of a population Per capita birth rate minus per capita death rate General growth equation: G = rN G = population growth N = number of individuals
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Exponential Growth In exponential growth
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