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Radioactive phosphorus was used as a tracer in assessing the number of red-legged grasshoppers (Melanoplus femurrubrum(De Geer)) eaten by the European praying mantis (Mantis religiosaL.) under seminatural conditions. The predator showed a functional response to changing prey densities with a continuously decreasing increase in the number of prey removed from the population.
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Mook et al. (1966) studied this question.
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