THE BEHAVIOR OF THE LARVAE OF ORTHOSOMA BRUNNEUM (FORSTER) (COLEOPTERA, CERAMBYCIDAE) IN RELATION TO GASES FOUND IN THE LOGS INHABITED BY THE LARVAE

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Abstract
During the present study we tested the influence of the gas concentrations found in logs on the behavior of Orthosoma brunneum larvae. We also tested gas concentrations far higher than found in nature. Feeding larvae gather in places containing over 0.03% CO2; where a choice of 0.03–100% CO2is available, they select the place containing 30–50% CO2. They do not congregate selectively in varied concentrations of O2, N2, or CH4. When the larvae cease feeding, although active, they no longer gather in places containing a higher concentration of CO2than 0.03%. These findings are related to the occurrence of the larvae in the natural environment.