Effects of bird predation on grasshopper densities in an Arizona grassland

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Date: Oct. 1992
From: Ecology(Vol. 73, Issue 5)
Publisher: Ecological Society of America
Document Type: Article
Length: 472 words

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Abstract :

Enclosure-exclosure experiments in an ungrazed, semi-arid Arizona grassland were conducted over a four-year period to determine whether insectivorous birds were the keystone predators that control the densities of and competition among herbivorous grasshoppers and thus indirectly affect vegetation cover. The results showed that the birds limited grasshopper densities. However increased grasshopper densities in the birds' absence did not affect vegetation cover significantly, indicating that at least in the short term, the birds were not the keystone predators.

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Gale Document Number: GALE|A14317820