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The influence of defoliation by leaf-cutting ants (Atta mexicana) on the dispersion patterns of xerophytic shrubs in the semi-arid valley of Zapotitlán, Mexico was analysed. All shrubs and ant nest entrances were mapped in a 65×50 m stand, and the vigour of each individual shrub was estimated. A regression analysis between the distance to the nearest nest and the vigour of plants showed a significant...
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