final-spring2001-key

final-spring2001-key - Name: KEY Spring 2001 Final Page 0...

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Name: KEY & Spring 2001 Final 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 _____
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Name: KEY & Spring 2001 Final Page 1 of 13 1. The following information was collected as part of a long-term 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 0.70 Stage 1 Juveniles 0.50 Stage 2 Juveniles 0.30 Stage 3 Juveniles 0.90 Adults 0.80 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 10,000 Stage 1 Juveniles 50 Stage 2 Juveniles 20 Stage 3 Juveniles 60 Adults 50 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
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Name: KEY & Spring 2001 Final Page 2 of 13 2. The following life table was developed for the one-legged, 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 0 ). Be sure to provide units along with your answer. R 0 = 0.9/ind/ind/generation 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
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Name: KEY & Spring 2001 Final Page 3 of 13 3-1. (6 points) List the three major elements of a well designed field experiment, and briefly (in a sentence) explain why each is important: Replication: units treated in similar ways will vary; replication allow you to estimate how much variation arises within a treatment group and thus assess whether the differences among groups are greater than expected. Increasing the number of replicates increases the statistical power. Controls: a control provides a basis for comparison that allows the experimenter to isolate the factor of interest from other factors that might be associated with a particular treatment. (A control is usually NOT "a treatment that is not unmanipulated"). Random assignment : Replicates are assigned to treatment groups at random (i.e., without regard to their characteristics) in order to avoid systematic variation among the groups not caused by the treatments.
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final-spring2001-key - Name: KEY Spring 2001 Final Page 0...

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