1. Corian Thomas Taylor Kirsten Mr. LY’s desk Promethean Board Carolann James Joekey- dia Korey Melvin Johnny Byron Torre Dominique Briana Kierra JonathanKrystal- yn DarnellKeiana Chanc Aaron Maria Lashante Patric k Aron Cierra Blue Caira BrandenTerrance Door into class LR

2. Carrying Capacity  Catalyst  Humans cut down 2.4 acres of rainforest (about the size of two football fields) EVERY SECOND. We estimate that 137 species go extinct every day as a result. How does deforestation affect biodiversity? Are rainforest ecosystems more or less stable due to deforestation? How might the biodiversity in these rainforests benefit humans?

3. Objectives By the end of today, all SWBAT…  Ace the quiz!  Predict if population size will increase or decrease based upon limiting factors and carrying capacity

4. Agenda  Catalyst review  Quiz  How many in a population?  Analyzing graphs  Jeopardy!  Closing  Exit Question

5. Catalyst Review  Humans cut down 2.4 acres of rainforest (about the size of two football fields) EVERY SECOND. We estimate that 137 species go extinct every day as a result.  How does deforestation affect biodiversity?  Are rainforest ecosystems more or less stable due to deforestation?  How might the biodiversity in these rainforests benefit humans?

6. Quiz!  Put away your binders…  Turn your desks into rows… And let’s ace that quiz! You have 15 minutes

7. How Many?  We’ve been talking about populations of organisms increasing or decreasing in size…  When new predators come  When organisms leave the food web  But what controls how many organisms exist in a population in the first place?

8. What determines population?  Why can’t we have…1,000,000 students here at L.W. Higgins?  Space  Teachers  Supplies  Student Behavior These resources are our limiting factors

9.  Key Point #1: An environment can only support as many organisms as there is available food, water, and free space  Carrying capacity = maximum number of organisms that can live somewhere, based on the food, water, and free space there  Every species has a different carrying capacity. Food, water, and free space are the LIMITING FACTORS that determine carrying capacity Carrying Capacity

10. Your fridge is like all of the resources (food, water, free space) in an ecosystem. What if we want to throw a party? Imagine Your Fridge

11. We can keep inviting people, as long as there’s enough food in the fridge. But with each new guest, there’s less to go around. Imagine Your Fridge

12. The fridge won’t replenish magically, and I don’t have the money to keep putting food in the fridge forever. So too many guests means that… So too many animals means that… Someone goes hungry… Not enough food/water/free space… And leaves the party.  And organisms die.  Imagine Your Fridge

13. Carrying Capacity  Key Point #2: We can read a carrying capacity graph to predict changes in population size Time Population size A B C D

14. Carrying Capacity  When a population is BELOW its carrying capacity, it will INCREASE in size  Birth rate exceeds death rates Time Population size A B C D

15. Carrying Capacity  But if it increases too much and rises ABOVE its carrying capacity, it will DECREASE in size  Death rate exceeds birth rate Time Population size A B C D

16. Carrying Capacity  This happens over and over… but the increases and decreases get smaller and smaller… Time Population size A B C D

17. Carrying Capacity  Until eventually, the population size BECOMES STABLE AT THE CARRYING CAPACITY  Birth rate = death rate Time Population size A B C D

18. determined by such as above it WORD BANK: water, carrying capacity, pop. size increases, limiting factors, food, pop. size decreases, space below it

19. Jeopardy! Rules: 1. Groups will be pulled at random to select questions from Jeopardy board 2. All groups will answer all questions 3. All groups will get 50 points for a correct answer, and the group that selected the answer will get ALL points

20. Closing  An environment can only support as many organisms as there is available food, water, and free space  Carrying capacity = maximum number of organisms that can live somewhere based on these limiting factors  We can read a carrying capacity graph to predict changes in population size  Below carrying capacity = increase  Above carrying capacity = decease  Over time, population stabilizes at carrying capacity

21. Exit Questions  What is the carrying capacity of rabbits in this ecosystem?  When is the carrying capacity for rabbits first reached?  Why does rabbit population size increase in the highlighted section of the graph?