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Exam 2 - 2008-Spring.pdf

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University of Florida
PCB 4043C

Name: 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. 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. GENERAL ECOLOGY PCB 3034/4044 Spring 2008 EXAM 2 PAGE POOSNIBLE SCORE 1 2 _____ 2 12 _____ 3 15 _____ 4 8 _____ 5 11 _____ 6 13 _____ 7 10 _____ 8 17 _____ 9 12 _____ _____ _________ TOTAL 100 _____ (2 points): 1) Are you interested in being an undergraduate TA for this course next year? ( YES, NO ) 2) From where/whom did you take Intro Bio (Ecology): e.g., “UF, Dr. Palmer”: ________ Name: Page 2 of 9 2-1. a. (4 points) Rank the following animals in order of lowest to highest production efficiency. Also indicate lowest and highest with words. _____worm that eats decomposing plant material _____fish that eats other fish _____goose that grazes on wetland grasses _____chicken that eats grain b. (4 points) Explain your ranking for each organism in relation to its (1) activity level, (2) assimilation efficiency of food resources and (3) thermoregulation. 2-2. (4 points) Explain why there are no wood eating hummingbirds. Name: Page 3 of 9 3-1. Assume that trophic efficiency for phytoplankton-animal energy transfer is 10%, animal-animal energy transfer is 50%. a) (5 points) How many kg of phytoplankton would it take to produce 70 kg of human biomass if that phytoplankton is first eaten by sardines, the sardines are eaten by tuna, and the tuna is eaten by humans? b) (5 points) How many kg of sardines would it take to produce 70 kg of human biomass if the humans ate the sardines directly? How many kg of phytoplankton if the humans ate the phytoplankton directly? 3-2. (5 points) On a recent trip to the north, you are startled by a rat scurrying acr oss the snowy surface of a parking lot; you do not see it at first because its c reamy white fur blends almost perfectly with the snow. How would you determine if the rat’s white fur is an acclimation to the snowy conditions? Name: Page 4 of 9 4-1. 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. 0.4 0.2 0 (per week)46411 -0.2 -0.4 Per Capita Growth Rate, dN/Ndt Daphnia Density (no. / 10 ml) a) (4 points) Given enough time, to what density will the population converge if initiated at the following densities: Final Density N 0 = 1 N 0 = 3 N 0 = 7 N 0 = 14 b) (4 points) Give a biologically plausible explanation for this hump-shaped function. Name: Page 5 of 9 5-1. (3 points) Dr. I.M. Green followed a cohort of plants through time, and at each point in time, recorded the number of survivors. (note the logarithmic scale). 100 10 Number still alive 0123456789 01 age (or time) Which of the following statements is correct (circle the correct one)? i. Younger plants have a higher annual survival probability than older plants ii. Older plants have a higher annual survival probability than younger plants iii. Young and old plants survive with the same probability iv. The answer can’t be obtained from the data available 5-2. The dynamics of three species can be described using the following equations: dN 1/N1dt = +1.0 - 0.1N 1 0.2N -20.1N 3 dN 2N 2t = +0.6 – 0.2N 1 dN 3/N3dt = -0.1 + 0.1N 1 For each of the following, choose (i.e., circle) the best option from the those available within parentheses: b) (2 points) Species 1 and 2: ( compete, are predator and prey; are mutualists, do not interact directly). c) (2 points) Species 1 and 3: ( compete, are predator and prey; are mutualists, do not interact directly). d) (2 points) Species 1 and 2 interact: ( indirectly only, di
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