Exam 2 - 2010-Spring

Exam 2 - 2010-Spring - Your code: Page 1 of 12 GENERAL...

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Your code: Page 1 of 12 GENERAL ECOLOGY (PCB 4043) Spring 2010 EXAM 2 Write your code on all the pages Make sure that all pages are attached. You may not use calculators, cell phones, brain chips, or other electronic aids. The math needed to solve a problem should be relatively simple. If you can't do the math, just show what needs to be calculated (e.g., "answer = .5 x .3") If you get hung up on a problem, skip it; return to it after you’ve answered the “easy” problems. PAGE POINTS POSSIBLE SCORE 1 2 _____ 2 6 _____ 3 8 _____ 4 8 _____ 5 10 _____ 6 10 _____ 7 6 _____ 8 11 _____ 9 10 _____ 10 11 _____ 11 8 _____ 12 10 _____ _____ _________ TOTAL 100 _____ 1-1. ( 2 points for either answer) Are you interested in being an undergraduate TA for this course next year? ( YES, NO )
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Your code: Page 2 of 12 2-1. A student doing an independent project (Zoo 4905) monitored Daphnia growth in a lake, and based on their performance was able to describe how the per capita growth rate varied as a function of density. Her data are shown below. a) (4 points) Given enough time, to what density will the population converge if initiated at the following densities: U Final Density N 0 = 1 N 0 = 3 N 0 = 7 N 0 = 14 b) ( 2 points ) Give a biologically plausible explanation for this hump-shaped function (your answer must be sufficiently complete to explain both the rise and fall of the curve). -0.4 -0.2 0 0.2 0.4 0 2 4 6 8 10 12 14 Per Capita Growth Rate, dN/Ndt (per week) Daphnia Density (no. / 10 ml)
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Your code: Page 3 of 12 3-1. (2 points) Dr. I.M. Green monitored a plant population’s density through time (note the logarithmic scale): Over which time period does the plant population exhibit the greatest per capita growth rate ( circle the correct option )? i. 0-3 yrs ii. 3-6 yrs iii. 7-10 yrs iv. The answer can’t be obtained from the data available 3-2. The dynamics of three species can be described using the following equations (where N is density, in no./m 2 ): dN 1 /N 1 dt = +1.0 – 0.1N 1 – 0.1N 2 dN 2 /N 2 dt = +0.6 – 0.2N 1 – 0.2N 2 – 0.1N 3 dN 3 /N 3 dt = –0.1 + 0.1N 2 For each of the following, choose (i.e., circle ) the best option from the those available within parentheses: a) (1 point) Species 1 and 2 are: ( competitors; predator and prey; mutualists, do not interact directly ) b) (1 point) Species 1 and 3: ( competitors; predator and prey; mutualists, do not interact directly ) c) (4 points) In the absence of Species 3, Species 1 and 2 will: ( both persist; only species 1 will persist; only species 2 will persist; neither will persist; there is not enough information provided ) hint: for c) apply the concept of invisibility. 1 10 100 1000 01234567891 0 Density time (years)
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Your code: Page 4 of 12 4-1. The following life cycle diagram is based upon a time interval of one year.
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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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Exam 2 - 2010-Spring - Your code: Page 1 of 12 GENERAL...

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