Exam 3 - 2008-Spring-KEY

Exam 3 - 2008-Spring-KEY - Name: KEY Page 1 of 8...

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Name: KEY 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 POINTS POSSIBLE SCORE 2 16 _____Schuyler 3 18 _____Caitlin 4 16 _____Caitlin 5 16 _____Schuyler 6 17 _____Michelle 7 17 _____Craig 8 Extra space _____ _________ TOTAL 100 _____
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Name: KEY 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 each hypothesis. (1) My buddies and I fished too much and reduced the density of bass, which led to a trophic cascade: fishing of bass released shiners from predation, which led to increased planktivory on zooplankton, which released phytoplankton from grazers. (2) The lake has become eutrophic because I (a) fertilize my lush green lawn with a suite of nutrients (especially nitrogen and phosphorus), and (b) my septic system might be leaking into the lake. The increase in nutrients stimulated algal production. [Note that this mechanism requires an incomplete numerical response of zooplankton, but you did not have to say this to get full credit.] 2-2. (6 points) Based on the theory of island biogeography, which island in each pair, would 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
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Name: KEY 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. 1. Niche partitioning (requires >1 resource); each species is limited by a different resource. 2.
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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 3 - 2008-Spring-KEY - Name: KEY Page 1 of 8...

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