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The questions and answers for exam ii in environmental biology 102, taught by professor gotelli during the fall 2002 semester. The exam covers topics such as statistical analysis, island biogeography, competition, and predator-prey dynamics.
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Environmental Biology Fall 2002
Name________________________________________
Total = 100 points
1 (12 points) _________ 2 (12 points) __________ 3 (25 points) __________ 4 (10 points) __________ 5 (15 points) __________
6 (6 points) __________ 7 (5 points) __________ 8 (15 points) __________
There are 4 pages and 8 questions.
To receive full credit for numerical problems, show your calculations and give the correct units for your answer. Partial credit will be given, so try to provide an answer for all questions.
Species Allopatric Populations Sympatric Populations Anolis grismani 7.5 mm 12.5 mm Anolis grappelli 8.5 mm 13.5 mm
You use a statistical test to assess the differences in jaw length among these four groups. Your statistical test produces a probability p = 0.006.
a) Carefully explain the meaning of “p = 0.006” in this test. Will you accept or reject the null hypothesis? Explain your reasoning. (6 points)
b) Does your statistical analysis tend to confirm or refute the hypothesis that character displacement has led to shifts in jaw size of these lizards? Briefly explain your reasoning. (6 points)
Environmental Biology Fall 2002
Suppose the initial population sizes are 30 red scorpions and 30 black scorpions. Plot these initial population sizes. Graph the state space and isoclines for each species, and the trajectories of population change. Be sure you label both axes and indicate the values at which each isocline crosses the x or y axis. (15 points)
Predict the short-term dynamics of each population and predict the final outcome of interspecific competition. (10 points)
Environmental Biology Fall 2002
rescue effect
competition coefficient (alpha (α))
escape in numbers
sink population
rescue effect