We experimentally determined whether the low density of antlion larvae found in ant-acacia clearings is due to high levels of ant predation or an inadequate substrate for pit-trap construction. Pit establishment was more affected by soil improvement than by the exclusion of ants, suggesting that soil condition is the main factor that affect antlions' density. The low density of this ant-predator in ant-acacia clearings may be considered as an indirect advantage of the ant's pruning behavior.
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