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Unformatted text preview: Name: Page 0 of 13 Instructions: Write your name on all the pages Make sure that all 13 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). GENERAL ECOLOGY PCB 4044 SPRING 2001 FINAL PAGE POINTS POSSIBLE SCORE 1 6 _____ 2 3 _____ 3 8 _____ 4 6 _____ 5 8 _____ 6 8 _____ 7 10 _____ 8 12 _____ 9 9 _____ 10 4 _____ 11 12 _____ 12 8 _____ 13 6 _____ _____ _________ TOTAL 100 _____ Name: Page 1 of 13 1. The following information was collected as part of a longterm study of the yellow headed salamander. 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 ). a. (3 points) What is the monthly mortality rate of Eggs Stage 1 Juveniles Stage 2 Juveniles Stage 3 Juveniles Adults b. (3 points) If there were 100 individuals of each stage on 1 May 2001, how many should there be on 1 June 2001? Eggs Stage 1 Juveniles Stage 2 Juveniles Stage 3 Juveniles Adults Juvenile Stage 3 Juvenile Stage 1 Eggs Juvenile Stage 2 Adult 0.3 0.2 0.5 0.1 0.2 0.1 0.2 0.2 100 Name: Page 2 of 13 2. The following life table was developed for the onelegged, red breasted goldfinch (a rare bird inhabiting swamps of northern Florida): Age class (yrs.) l x b x 0 1.0 0 1 0.8 0 2 0.4 0 3 0.2 4 4 0.1 1 5 0.0 0 a. (2 point) Based on this life table, what is the net reproductive rate (R ). 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 Name: Page 3 of 13 31. (6 points) List the three major elements of a well designed field experiment, and briefly (in a sentence) explain why each is important: 32. Dr. Dennis Dependent established a gradient of Daphnia density (number per liter flask). He then recorded the number that were still alive one week later. He summarized the data by plotting the proportion of the original Daphnia that were still alive after one week: 0.2 0.4 0.6 0.8 1 20 40 60 80 100 120 140 160 180 Number of Daphnia Proportion surviving ( 2 points ) Over what range of densities is Daphnia survival probability density in dependent? Name: Page 4 of 13 4. The dynamics of three species can be described using the following equations: dN 1 /N 1 dt = 1.3 & 0.2N 1 & 0.2N 2 + 0.7N 3 dN 2 /N 2 dt = 0.9 + 0.3N 1 & 0.6N 2 dN 3 /N 3 dt = 0.7 + 0.2N 1 & 0.4N 3 a. Based on the direct effects,...
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 Spring '10
 Osenberg

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