Thursday, June 6, 2013

Hello students.  I know you all missed me; don't worry I missed you too.  I will be back tomorrow though.  I decided to post-pone the test until Tuesday.  I realized it wasn't fair if I didn't do the review with you.  For today, please use regular lined paper to answer all the questions and turn it into the guest teacher at the end of the day.

Activity 1 - Carrying Capacity and Satiation in Predator-Prey Relationships

You will first look up a definiton to help you understand the assignemtn.  Once that is done, you will be runngin a carrying capacity simulation.  Answer the questions that go with the simulation.

Satiation Definition - Click Here

Simulation - Click Here
In case you didnt understand, satiaiton just means that something is beyond full.  Also, equalibrium just means balanced.

1. In the absence of predators, what happens to the population of herbivores? Why? Is this reasonable?
2. Try the simulator with various carrying capacity values for both options, with and without satiation and note the differences?
3. What is the effect of carrying capacity on equilibrium densities? And how does this carrying capacity affect the stability of the population?
4. How do your conclusions from this satiation model differ from your conclusions from the non-satiation model?
5. Change the satiation value of the predator and try to repeat the experiment as asked in problem 4 and note down the differences? Try the higher values of satiation and lower values of satiation

Activity 2 - Video Time - Population Growth
Watch the videos
Which one was the the most helpful? Why? (3-5 sentences)
Which was the least helpful? Why? (3-5 sentences)

Video 1 - Click Here
Video 2 - Click Here
Video 3 - Click Here


Activity 3 - Graphing

Using the data in the table below, make a graph illustrating the changes in a gray bat population of a single colony. Don’t forget to label your graph. Use the graph you’ve create to answer the questions .

Data

Year                       1982   1986   1988  1990  1991   1994   1997   1998    1999   2000

Number of Bats       400     453     253    481    752    1101   1949   1552   1430    3768 

1. How many times has the population decreased since it started being measured in 1982?
2. What are some reasons the population could decrease? (give at least 3)
3. The colony was not measured in 1995. Using your graph, estimate how many bats were in the colony that year.
4. When do you think this colony started being protected? 

Activity 4 - Food Web Activity
You need to complete 2 of the food webs from the website.  Please draw them on your paper and make sure your arrows are going in the correct direction.  
Click Here