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The Wolf, the Moose, and the Fir Tree: A Case Study of Troph

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christianna glaze

on 24 September 2013

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Transcript of The Wolf, the Moose, and the Fir Tree: A Case Study of Troph

Christianna Glaze, Keairus Graves, Ray Tillman
Part 3: Summary
Ring-widths of balsam firs from Isle Royale. each line represents data from an individual tree harvested in 1992.
The Wolf, the Moose, and the Fir Tree: A Case Study of Trophic Interactions
Isle Royale National Park (longest island in lake Superior) is a good place for Biologist to study interactions between diffrent Trophic levels.
Consisting of producers and a single larde herbivore that in turn has only a single preator, the gray wolf(canis Lupus
The island had a large abundance of Balsam Fir , until the island was took over by Moose. (1900's)
After the Mooses (large herbivore) arrived to this island the percentage of the Fir dropped from 46% in the 19th century , to 5% today.
Part 1:
Part 1:
Question & Answer
1. What type of correlation (positive or negative) would you expect to see between the population densities or growth rates of each trophic level in this system (fir/moose/wolves) under the primary productivity hypothesis?
- Our hypothesis is, it will be a negative because they will begin to feed on each other cause it will be less to eat.
Part 2: Summary
This graph is a representation of the moose and wolf populations.
Ring width indicates from firs on each end of the lsland ,and actual evaptranspiration rates, From April to October.
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