https://mymasonportal.gmu.edu/bbcswebdav/users/klargen/Case%20Study%20-%20The%20

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https://mymasonportal.gmu.edu/bbcswebdav/users/klargen/Case%20Study%20-%20The%20Wolf%20the%20Moose%20and%20the%20Fir%20Tree%20-%20Who%20Controls%20Whom%20on%20Isle%20Royale.pdf

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QUESTION 5 What happened to balsam fir after colonization of Isle Royale by moose?

baslam fir increased from 5% to 59% of the overstor

y balsam fir decreased from 59% to 5% of the overstory

balsam fir decreased from 46% to 5% of the overstory

balsam fir increased from 5% to 46% of the overstory

QUESTION 6

Refer to the information on page 2. Which of the following statements is correct?

A. tree-ring widhts will not change over time in response to herbivory

B. trees which have a lot of their foliage removed by herbivores will produce tree rings that are narrower

C. trees which have a lot of their foliage removed by herbivores will produce tree rings that are wider

D. narrower tree rings indicate the a tree has been subjectede to more intense herbivory

E. B and D

QUESTION 7 Refer to the figure on page 3. The data for wolves and AET in 1980 supports the "bottom up" hypothesis.

True

False

QUESTION 9 Part II: According to Figure 1, fir tree (east and west) ring-widths were at their lowest at approximately the same time that moose populations were at their lowest.

True

False

QUESTION 10 Part III: According to Figure 2, none of the trees that were less than 2m in height had ring-widths greater than 1.3mm.

A. True

B. False

Explanation / Answer

QUESTION 5. balsam fir decreased from 46% to 5% of the overstory
QUESTION 6. D. narrower tree rings indicate the tree has been subjected to more intense herbivory
QUESTION 7 True
QUESTION 9 False
QUESTION 10 False

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