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

2. AP Biology Changes to population size  Adding & removing individuals from a population  birth  death  immigration  emigration

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

4. AP Biology 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. AP Biology Model of growth Decrease in rate of growth as reach carrying capacity

6. AP Biology Different life strategies  K-selection  r-selection K-selection r-selection mortality constant

7. AP Biology 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. AP Biology Predator – prey interactions  Population cycles

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

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