section23

section23 - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 23 May 9-10, 2005 Communities The set of graphs on page 3 shows the results of a 35-year study of a seemingly simple food chain on Isle Royale in Michigan. These results were published in the journal Science (vol. 266 pp. 1555-1558) – you don’t need to read this, although it is an interesting paper. On Isle Royale, moose ( Alces alces ) eat fir tree ( Abies balsamea ) leaves and wolves ( Canis lupus ) eat the moose. a) In the graph, “Fir (west) (mm)” gives the average size of the tree rings produced in each year by the fir trees on the west end of the island in millimeters; “Fir (east) (mm)” gives the same for the trees on the east end. The more a tree grew in a particular year, the wider the ring. The width of a tree ring is defined as the distance from the ring in question to the ring formed just prior to it. i) The scientists use the width of the tree rings as a measure moose consumption. That is, they
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section23 - MIT Department of Biology 7.014 Introductory...

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