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Exam 3 - 2008-Spring.pdf

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PCB 4043C

Name: Page 1 of 8 Instructions: --Write your name on all the pages --Make sure that all pages are attached. --Any 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). ECOLOGY PCB 4044 / 3063 SPRING 2008 EXAM 3 PAGE POOSNIBLE SCORE 2 16 _____ 3 18 _____ 4 16 _____ 5 16 _____ 6 17 _____ 7 17 _____ 8 Extra space _____ _____ _________ TOTAL 100 _____ Name: Page 2 of 8 2-1. ( 10 points) Consider the following food-chain: bass – shiners – zooplankton – phytoplankton You bought an undeveloped lake (it had very clear water) 10 years ago and built your dream house on its shores. Recently, the lake water has turned green due to high concentrations of algae (phytoplankton). List two hypotheses (involving different aspects of the ecosystem) that can explain this increase in phytoplankton since you built your dream house. Provide a brief explanation (1-2 sentences) of the logic underlying ea ch hypothesis. 2-2. (6 points) Based on the theory of island biogeography, which island in each pair, w ould you expect to contain the greatest number of species (all else being equal)? Circle the best answer from each set. Set 1: small Large Can't be determined with available data Set 2: near Far Can't be determined with available data Set 3: near and large far and small Can't be determined with available data Name: Page 3 of 8 3-1. (12 points) In the middle of the course, we noted that two competing species cannot coexist on a single limiting resource. We subsequently discussed several ways in which several potentially competing species could persist together. Please list and briefly discuss (e.g., in one sentence each), three ways in which two or more competing species can persist locally. 3-2. (6 points) Capybara are semi-aquatic, herbivorous rodents native to South America. At an average of 35-75 Kg, they are the largest rodents on the planet. 25 animals escaped from a South Florida breeding facility, and there is concern that they may be persisting and even reproducing in the Everglades. List six ways (1 phrase each) that Capybara might affect nati
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