Midterm2-spring2003

Midterm2-spring2003 - Name: Page 1 of 8 Instructions:...

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Name: Page 1 of 8 Instructions: --Write your name on all the pages --Make sure that all 8 pages are attached. --You may NOT use calculators or other electronic aids. The math needed to solve a problem should be relatively simple. If not please give your answer by showing how you would make the calculation: e.g., showing "(10+10)/4" is as good an answer as "5" (writing down an appropriate equation and clearly defining the variables, as well as indicating their values, if known, will also suffice). --If you get hung up on a problem, skip it; return to it after you’ve answered the “easy” problems. GENERAL ECOLOGY PCB 4044 SPRING 2001 MIDTERM 2 PAGE POINTS POSSIBLE SCORE 2 10 _____ 3 17 _____ 4 12 _____ 5 12 _____ 6 10 _____ 7 12 _____ 8 10 _____ Bonus Points 17 17 _________ TOTAL 100 _____
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Name: Page 2 of 8 2-1. (5 points) Compared with the standard Lotka-Volterra predator-prey model, which is neutrally stable, how will each of the following modifications affect the stability of the equilibrium (assuming other aspects of the system remain unchanged)? Circle the best answer for each item. Prey density-dependence Stabilize Destabilize Either No effect Type II functional response Stabilize Destabilize Either No effect Prey switching by the predator Stabilize Destabilize Either No effect Cannibalism by the predator Stabilize Destabilize Either No effect Increased attack rate by the predator Stabilize Destabilize Either No effect 2-2. ( 5 points ) Pick the best option from the choices in parentheses (2 points each): a) A substitutive competition design (aka “deWit replacement series”) is most useful if you want to quantify the ( strength of intraspecific competition ; the strength of interspecific competition ; the ratio of the strength of intra- to interspecific competition ; the relative importance of competition to predation ). b) an effective bio-control agent should have a ( low; moderate; high ) conversion efficiency. c)
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Midterm2-spring2003 - Name: Page 1 of 8 Instructions:...

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