Wolves were reintroduced to Yellowstone in 1995. Explain the trend seen in each
ID: 203234 • Letter: W
Question
Wolves were reintroduced to Yellowstone in 1995. Explain the trend seen in each part (A-H) of the following figure and propose a hypothesis for each trend that explains how the trend could be related to wolf reintroduction. Refer to a food web above to help you generate hypotheses. Note that browsing mean eating of trees.
200 20A Wolves 100 E Cottonood 150 40 50 F Willow 20B Elk -Booth o 15 10 c 10 C Browsing 2 G Beaver 10 100 With Without 40 Uplands-4- 20Ripariano 2500 E 2000 81500 1000 2 350 D Aspen height H Bison 250 200 150 100Ripara With Without 0 1990 1995 2000 2005 2010 1990 1995 2005 2000 Year 2010Explanation / Answer
A) Wolves Population: Trend- After reintroduction of wolves in Yellowstone wolves population increased upto certain limit and now it is decreasing from 2007 to 2010.
Hypothesis: Increase in wolves Population is limited by certain factors.
B) Elk Population: Trend- After reintroduction of wolves in Yellowstone Elk population showed decreasing trend Hypothesis: Decrease in Elk Population is due to increase in wolves’ population as elk are eaten by reintroduced wolves.
C) Browsing
Trend: After reintroduction of wolves in Yellowstone Percent of browsing is decreasing continuously.
Hypothesis: Percentage of browsing is decreasing as numbers of Elk are decreasing because they are eaten by reintroduced wolves.
D) Aspen height
Trend: After reintroduction of wolves in Yellowstone Aspen height is showing increasing trend continuously in uplands and riparian.
Hypothesis: Aspen height is increasing as there is reduction in browsing as Elk population is decreasing because they are eaten by reintroduced wolves.
E) Cottonwood
Trend: After reintroduction of wolves in Yellowstone Number of cottonwood tress are increasing.
Hypothesis: Increased number of cottonwood tress is due to reduced browsing of Elk population as elk population is decreasing because elks are eaten by reintroduced wolves.
F) Willow
Trend: After reintroduction of wolves in Yellowstone ring area of Willow showed increasing trend
Hypothesis: Increased ring area of Willow is related to number of cottonwood tress
G) Beaver
Trend: After reintroduction of wolves in Yellowstone Number of Beaver colonies are increasing
Hypothesis: Beaver colonies increased as there is increase in number and height of tress.
H) Bison
Trend: After reintroduction of wolves in Yellowstone Bison count is increasing
Hypothesis: Bison count is increasing because their completion with elks is less as elks are eaten by reintroduced wolves.
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