1. How do resources affect population density?

2. What is a population? 3. What is a population? 4. What is the density of a population? 5. What is the density of a population? 6. What causes population density to change? 7. What causes population density to change? Density Births Deaths Migration Resources Space Food Other necessities Enemies Predators Disease 8. Resources Populationdensity Hypothesis 9. Resources Populationdensity Null Hypothesis 10. Experiment design What Ive Done 1. Cut leaves into three sizes 2. Place leaves in test tubes 3. Add 10 aphids to each tube What Youll Do 1. Count the number of adult aphids 2. Count the number of baby aphids 3. Switch to a tube with a different leaf size and repeat 1 and 2 11. Whats an aphid?? 12. Whats an aphid?? 13. Whats an aphid?? 14. Whats an aphid?? 15. Whats an aphid?? 16. Experiment design What Youll Do 1. Count and record the number of adult aphids 2. Count and record the number of baby aphids 3. Add these together for the population density (What is the unit for area?) 4. Calculate the number of births and deaths 5. Switch to a tube with a different leaf size and repeat 1 and 2 17. Resources Populationdensity 3 cm 6 cm 9 cm 18. Review What is a population? What is population density? What factors affect population density? How does food affect aphid population density?