Exam 2 - 2008-Spring-key

Exam 2 - 2008-Spring-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. 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 POINTS POSSIBLE 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”: ________
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Name: KEY 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. __ 4 ___worm that eats decomposing plant material ( Highest ) __ 3 ___fish that eats other fish __ 1 ___goose that grazes on wetland grasses ( Lowest ) ___ 2 __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. Goose: Lowest production efficiency because it has a high activity level (grazing, flying, escaping predators, migrating in search of food resources),a high cost of homeostasis since it is an endotherm/homeotherm, and it is consuming grasses, a food resource that has relatively low assimilation efficiency (60-70%). Chicken: Like the goose, it has a high activity level (finding grain, flying, escaping predators, “the pecking order”) and is an endotherm. Unlike the goose, it is consuming a food resource with a relatively high assimilation efficiency (80%). As a result, it has higher production efficiency than the goose. Fish: lower activity level than birds and low cost of homeostasis due to ectotherm/poikilotherm/heterotherm thermoregulation. High assimilation efficiency of meat (60- 90%). Worm: Highest production efficiency because of low activity (surrounded by food resources) and medium-high assimilation efficiency since it is consuming a rich mix of plant material and microbes. It is an ectotherm so the energetic costs of homeostasis are relatively low. 2-2. (4 points ) Explain why there are no wood eating hummingbirds. High energetic cost of activity and homeostasis, low assimilation efficiency of wood.
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Name: KEY Page 3 of 9 3-1. Assume that trophic efficiency for phytoplankton-animal energy transfer is 10%, animal-animal energy transfer is 50%.
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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 - 2008-Spring-key - Name KEY Page 1 of 9...

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