Midterm2-2004-Fall-KEY

# Midterm2-2004-Fall-KEY - Name KEY Page 1 of 9...

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Name: KEY Page 1 of 9 Instructions: --Write your name on all the pages --Make sure that all 9 pages are attached. --You may NOT use calculators or other electronic aids. --If you get hung up on a problem, skip it; return to it after you’ve answered the “easy” problems. GENERAL ECOLOGY PCB 4044 FALL 2004 MIDTERM 2 PAGE POINTS POSSIBLE SCORE 2 11 _____ 3 17 _____ 4 12 _____ 5 12 _____ 6 10 _____ 7 12 _____ 8 4 _____ 9 15 _____ Bonus (for surviving so far) 7 ___7_ _ _________ TOTAL 100 _____

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Name: KEY Page 2 of 9 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. Intraspecific competition among the prey Stabilize Destabilize Either No effect Type II functional response for the predator feeding on the prey Stabilize Destabilize Either No effect Allee effect for predator Stabilize Destabilize Either No effect Cannibalism by the predator Stabilize Destabilize Either No effect Increased conversion efficiency of the predator Stabilize Destabilize Either No effect 2-2. ( 6 points ) Circle the best option from the choices given in bold (1 point each): a) An additive competition design varies the density of species A (holding B constant) and the density of B (while holding A constant) and measures the per capita growth of both Species A and B. This design is most useful if you want to quantify the: i) strength of intraspecific competition ii) the strength of interspecific competition iii) the relative strength of intra- to interspecific competition iv) all of the above v) none of the above b) an effective bio-control agent should have a ( low; moderate; high ) conversion efficiency. c) Based on the Lotka-Volterra competition model (and the Competitive Exclusion Principle), two competing species ( can; cannot ) stably coexist on a two limiting resources. d) Exploitative competition arises when two species ( both consume a limited resource; eat each other; defend mating territories ). e) 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
Name: KEY Page 3 of 9 3-1. (7 points) Explain, using words , the conditions that must be satisfied for a disease that has infected only a few hosts thus far to spread to a greater number of hosts. Be sure to explain the role of key factors (e.g., think about variables in models that we explored) that play an important role in this process. An infected host must transmit the disease to a new host before dying or recovering

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Midterm2-2004-Fall-KEY - Name KEY Page 1 of 9...

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