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Feeding of tobacco hornworm larvae under different light conditions as indicated by fecal evacuations



Feeding of tobacco hornworm larvae under different light conditions as indicated by fecal evacuations



Ohio Journal of Science 77(2): 81-83



The periodicity of fecal evacuations of tobacco hornworm larvae (Manduca sexta) was monitored throughout the total larval phase in constant light, constant darkness, and a fall rhythm of light and darkness. By observation of feeding behavior and fecal evacuations of larvae, the time relationship of fecal evacuation and ingestion was recorded. The interval between initial ingestion and first evacuation averaged 3.75 h. During intervals between molts larvae actively fed in periods averaging 14 min. The average length of feeding periods between molts was 58 h and the length of molting periods 22 h. The total larval phase covered 375 h in the fall light-dark cycle, 358 h in continuous darkness, and 407 h in continuous light. The total larval phase and the total numbers of fecal pellets evacuated in the different light regimes were not significantly different.

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Accession: 005454054

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