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Midterm2-spring2001-key

# Midterm2-spring2001-key - Name KEY Page 1 of 7...

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Name: KEY 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 _____ Note: Correct answer given on figures or in bold and italics.

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Name: KEY 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. f) A mutualism exists if the dynamics of one species is ( positively ; negatively; not ) affected by a second species, and the second species is ( positively ; negatively; not ) affected by the first g) Exploitative competition arises when two competing species ( share a limited resource ; eat each other; defend mating territories ).
Name: KEY Page 3 of 7 3-1. You have been asked by the State of Florida to design a network (i.e., an interconected system of "islands") of pine barren reserves in north Florida. The State is particularly interested in the long-term conservation of a species of butterfly.

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Midterm2-spring2001-key - Name KEY Page 1 of 7...

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