Abstract
We measured the direct and interactive effects of larval density, ant predation, and soil moisture on larval survival and community structure of mycophagous flies. First instar larvae of a brown-eyed Drosophila tripunctata mutant were added to Agaricus bisporus mushrooms (10, 20 or 40 larvae/mushroom). The mushrooms were placed on dry, moist, or wet soil in ant-access and ant-exclusion treatment cups. The cups were placed in a woodland for 5 days where they were available to native flies for oviposition. We used ANOVA and MANOVA to measure the effects of our independent variables on the percentage of mutant larvae completing development and the number and diversity of native metamorphs. Ants visited wet soils (30% visited) more frequently than moist (20% visited) or dry soils (10% visited), and had stronger negative effects on larval survivorship and native metamorph abundance in wet and moist microenvironments
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