Midterm2-spring2001

# Midterm2-spring2001 - Name Page 1 of 7 Instructions-Write...

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Name: Page 1 of 7 Instructions: --Write your name on all the pages --Make sure that all 7 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 ±easy² problems. GENERAL ECOLOGY PCB 4044 SPRING 2001 MIDTERM 2 PAGE POINTS POSSIBLE SCORE 2 26 _____ 3 12 _____ 4 10 _____ 5 29 _____ 6 12 _____ 7 10 _____ Bonus for surviving to this point 1 ___1_ _________ TOTAL 100 _____

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Name: Page 2 of 7 2-1. (12 points) Compared with the standard Lotka-Volterra predator-prey model, how will each of the following modifications affect the stability of the equilibrium? Circle the best answer for each item. Prey density-dependence Stabilize Destabilize Either No effect Type II functional response Stabilize Destabilize Either No effect Type III functional response Stabilize Destabilize Either No effect Predator interference Stabilize Destabilize Either No effect Cooperative foraging among predators Stabilize Destabilize Either No effect High conversion efficiency of the predator Stabilize Destabilize Either No effect 2-2. ( 14 points ) Pick the best option from the choices in parentheses (2 points each): a) increased contact rate between hosts should lead to the evolution of ( increased; decreased ) virulence of a pathogen. b) an effective bio-control agent should have a ( low; moderate; high ) conversion efficiency. c) an effective bio-control agent should have a ( low; moderate; high ) attack rate on its prey. d) Based on the Lotka-Volterra models (and the Competitive Exclusion Principle), two competing species ( can; cannot ) stably coexist on a single limiting resource. e) True or False : coevolution involves the simultaneous and independent evolution of the same trait in two different species.
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## This note was uploaded on 06/04/2011 for the course PCB 4043 taught by Professor Osenberg during the Spring '10 term at University of Florida.

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Midterm2-spring2001 - Name Page 1 of 7 Instructions-Write...

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