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The influence of foraging by the ant, Lasius niger, on the population growth of two aphid species, Lachnus tropicalis and Myzocallis kuricola, on chestnut trees, Castanea crenata, was examined. The ant-tending effect was divergent depending on the aphid density per ant: it was positive when there were few aphids per ant, but negative when there were many aphids per ant. In addition, the density of...
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