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Population Ecology

Chapter 52. Population Ecology. Modified from: Kim Foglia, Explore Biology. Changes to population size. Adding & removing individuals from a population birth death immigration emigration. Growth rate. Exponential growth characteristic of a population without limiting factors

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Population Ecology

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  1. Chapter 52 Population Ecology Modified from: Kim Foglia, Explore Biology

  2. Changes to population size • Adding & removing individuals from a population • birth • death • immigration • emigration

  3. Growth rate • Exponential growth • characteristic of a population without limiting factors • ex. introduced to a new environment Whooping crane coming back from near extinction African elephant protected from hunting

  4. Carrying capacity • Can populations continue to grow exponentially? • of course NOT! • what sets limit? • resources, predators, parasites • Carrying Capacity (K) • maximum population size that environment can support with no degradation of habitat • not fixed; varies with changes in resources

  5. Model of growth Decrease in rate of growth as reach carrying capacity

  6. Different life strategies • K-selection • r-selection K-selection mortality constant r-selection

  7. Reproductive strategies • K-strategy • have few offspring & invest a lot of energy in raising them to reproductive age • primates • coconut • r-strategy • have many offspring & invest little in their survival • insects • dandelion & other weeds

  8. Predator – prey interactions • Population cycles

  9. Age structure • Relative number of individuals of each age What do the data imply about population growth in these countries?

  10. Is the human population reachingcarrying capacity? Human population What factors have contributed to this exponential growth pattern? 20056 billion 1650500 million

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