Population Regulation

figure 19-10

The hare and the lynx (a) were observed by Elton to have parallel changes in their population cycles. The graph below (b) shows the data recorded by Elton supporting his idea that each animal controlled the other animal's cycle. You can see that the cycles fluctuate together. Because hares show the same population cycles when there are no lynxes present, it is now known that lynxes are not controlling factors in the hares' cycles.

(a)

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