Biotic and abiotic effects on density, body size, sex ratio, and survival in immature stages of the European woodwasp, <i>Sirex noctilio</i>.

Head width estimates differed and generally increased from the early to late sampling date, though this relationship was only marginally significant (Tukey's HSD, p = 0.05) and was overshadowed by a significant sampling date × position effect ( F = 7.2; df = 4, 94.4; p < 0.0001).

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