Filtration of Nutritional Fluids in the German Wasp <i>Vespula germanica</i> (Vespidae, Hymenoptera).

When testing the different size categories of glass beads, a highly significant difference between the presence and absence of glass beads in both the infrabuccal pocket (χ2(5) = 51.516, p < 0.001, φc ≈ 0.912, n = 62) and the crop (χ2(5) = 24.428, p < 0.001, φc ≈ 0.633, n = 62) was found ( Table 2 ).

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