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The Canada lynx feeds primarily on snowshoe hares. When the population of hares increases or decreases, so does the lynx population.
The numbers of lynx are very dependent on the numbers of hares; when hares are few, lynx are few, and vice versa. The numbers of snowshoe hares tend to reach a peak every ten to fifteen years. The increased food source results in larger lynx litter sizes, fewer kitten deaths, and a corresponding increase in the lynx population.
 Eventually, the increased number of lynx preying on the hares causes a decline in the hare population. As hares become rare, lynx litter sizes shrink, fewer kittens survive, and lynx numbers decline. This sets the stage for the cycle to begin again.
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These graphs show the numbers of snowshoe hares and Canada lynx over a thirty-year period. Note how the lynx population reaches its peak one or two years after the hares have reached theirs. Why do you think this is the case? Select this text to see the answer. |
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Produced by the Natural History Museum of Los Angeles County. © Natural History Museum of Los Angeles County Foundation This page was made possible by a grant from Friskies PetCare Company and the National Science Foundation. All photographic images contained within these Web pages ARE COPYRIGHTED and may not be reproduced or utilized in any manner without the express written consent of the owner. Photograph of lynx and hare diorama by Jim Angus © Natural History Museum of Los Angeles County Foundation Sketches of lynx, hare, and the lynx/hare cycle by Rick Roe © Natural History Museum of Los Angeles County Foundation Composite photograph of snow-covered landscape by Jim Angus © Jim Angus Page design by Jim Angus |