final-spring2003-key

# final-spring2003-key - Name KEY Page 1 of 13...

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Name: KEY 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: KEY 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 0.3 Stage 1 Juveniles 0.7 Stage 2 Juveniles 0.5 Stage 3 Juveniles 0.1 Adults 0.2 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 1000 Stage 1 Juveniles 7 Stage 2 Juveniles 2 Stage 3 Juveniles 6 Adults 3
Name: KEY 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. 0.8 individuals/individual/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 3-2. (6 points) Define each of the following and explain why they are a critical element of a good experiment. CONTROL(S) A treatment that lacks the factor of interest, but is otherwise identical to another treatment. A control allows the experimenter to isolate the effect of the factor of interest (from cofounding influences). REPLICATION Replication refers to the number of independent subjects that receive a treatment. Because subjects will not respond identically to a given treatment, replication allows the experimenter to estimate the within-treatment variation in the response and thus helps her/him guage whether the observed differences between treatments are real (i.e., exceed the expected difference within a treatment due to sampling error). Increased replication leads to increased power. RANDOM ASSIGNMENT

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final-spring2003-key - Name KEY Page 1 of 13...

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