1. Bell Ringer Create an example of commensalism.
Draw an image of parasitism.
What are the two main chemicals in acid rain? What does acid rain do to the environment?
Draw and label the carbon cycle. Where do you see the carbon cycle present in your life?

2. Bell Ringer
A lion kills a zebra and eats. Once the lion leaves a vulture comes to consume the remains of the zebra. What type of symbiotic relationship is this?
Draw an image of parasitism.
What are the two main chemicals in acid rain? What does acid rain do to the environment?

3. Matching Symbiosis
On the back of yesterday’s video sheet identify each square as either Commensalism, Parasitism, or Mutualism.

4. Population Ecology Notes

5. Demography
Demographers are scientists who study population growth. When studying population growth, you will often refer to charts and graphs. The following graphs and charts display examples of population growth.

6. Linear Growth
Linear Growth – Growth in a straight line. Your hourly wage would grow constantly.

7. Logistic Growth
Logistic or S-Shaped Growth Curve – Most populations grow this way. Occurs when the growth rate decreases as the population reaches carrying capacity

8. Population Growth
Lag Phase  Many organisms are reproducing and the population is just getting started.

9. Population Growth Continued
Exponential Growth  The numbers of organisms are increasing rapidly because there are good environmental conditions, enough food and shelter and few predators.

10. Population Growth Continued
Carrying Capacity  (represented by the letter K) the maximum number of organisms the environment can support.

11. Population can reach carrying capacity because of two types of limiting factors….
Density-Dependent Factors: factors that limit the population size because there are too many organisms.
Examples are: food, shelter, & disease
Density-Independent Factors: factors that limit the population size regardless of the number of organisms.
Examples are: weather, natural disasters, & temperature

12. Population Growth Continued
Stabilization Phase  The population levels out and will remain at or below the carrying capacity.

13. What other factors limit pop. size?
Predation: Predatory-Prey Relationships are important for the health of natural populations. Usually in natural populations, the young, weak, or diseased members are caught by predators.

14. What other factors limit pop. size?
Competition: When the population number increase in an area, competition increases until eventually the demand is greater than the supply and the population size will reach its carrying capacity and the population will stabilize.
Crowding/Stress: Crowding
of organisms can cause
stress-related effects such
as fighting, disease, infertility,
and other odd behaviors.

15. Human Population Growth
Human Population: The human population has been growing exponentially over the past 100 or so years. This is because of the introduction of medicine, technology, and longer life spans.

16. Human Population Growth
What are some consequences of the rapid growth of the human population?

18. Population Graphs Identify which graph is: On the back: Steady growth
Steady decline
Exponential (rapid growth)
Logistic growth (carrying capacity)
On the back:
Create a graph with proper labels using the chart below.
Hint: You will need two different colors for hare line and lynx line.

19. Lynx & Hare Graph Sheet
If not finished, its homework.

20. 300 Years of Fossil Fuels in 300 Seconds

21. Closure Part 1
Lion kills a zebra & eats until full. Once lion leaves a vulture comes & eats the remains.
Shark swims & pilot fish swims underneath for protection.
A leech on your skin.
Plover bird cleans alligators teeth.