final-spring2003 - Name: Page 1 of 13 Instructions: -Write...

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Name: Page 1 of 13 Instructions: --Write your name on all the pages --Make sure that all 13 pages are all 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). GENERAL ECOLOGY PCB 4044 SPRING 2003 FINAL PAGE POINTS POSSIBLE SCORE 2 10 _____ 3 9 _____ 4 14 _____ 5 11 _____ 6 9 _____ 7 8 _____ 8 14 _____ 9 15 _____ 10 10 _____ 11 8 _____ 12 15 _____ 13 12 _____ _____ _________ TOTAL 135 _____
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Name: Page 2 of 13 2-1. The following life cycle diagram is based upon a time interval of 1 month, and was used to construct a projection matrix ( recall that reproduction in a projection matrix is handled differently than in a life table ). Juvenile Stage 3 Juvenile Stage 1 Eggs Juvenile Stage 2 Adult 0.3 0.2 0.5 0.1 0.4 0.1 0.2 100 a. (5 points) What proportion of individuals in each life stage survive from one month to the next? Eggs Stage 1 Juveniles Stage 2 Juveniles Stage 3 Juveniles Adults b. (5 points) If there were 10 individuals of each stage on 1 May 2003, how many individuals of each stage should there be on 1 June 2003? Eggs Stage 1 Juveniles Stage 2 Juveniles Stage 3 Juveniles Adults
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Name: Page 3 of 13 3-1. The following life table was developed for a small mammal: Age class (yrs.) l x b x 0 1.0 0 1 0.9 0 2 0.5 0 3 0.3 2 4 0.1 2 5 0.0 0 a. (2 point) Based on this life table, what is the net reproductive rate (R 0 ). Be sure to provide units along with your answer. b. (1 points) Assuming the population has achieved a stable age distribution, how will its density change? Circle the best answer: decrease remain the same increase 3-2. (6 points) Define each of the following and explain why they are a critical element of a good experiment. CONTROL(S) REPLICATION RANDOM ASSIGNMENT
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Page 4 of 13 4-1. Dr. Denise T. Pendant established a gradient of Daphnia density (number per liter flask). She then recorded the number that were still alive one week later. She summarized the data by plotting the proportion of the original Daphnia that were still alive after one week: 0 0.2 0.4 0.6 0.8 1 0 20 40 60 80 100 120 140 160 180 Number of Daphnia Proportion surviving ( 3 points ) Over what range of densities is Daphnia survival density-dependent? 4-2 ( 5 points ) The U.S. applies vast amounts of nitrogen to agricultural fields to enhance the production of crops. Briefly discuss the general fate of this nitrogen (i.e., where does it go?) and its possible implications (what effects might it have on ecological systems). 4-3.
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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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final-spring2003 - Name: Page 1 of 13 Instructions: -Write...

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