Boonstra knew that during the decline

[bovton1818]

Boonstra knew that during the decline phase of the snowshoe hare cycle, the great majority of hares are killed by predators. But there turned out to be more to the story. When Boonstra's student, Michael Sheriff, tested faeces of live-caught hares during the rise and fall phases of the population cycle, he found that levels of the stress hormone cortisol in mother hares fluctuated with predator density, peaking when predators were most numerous.

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