Author: BECK STANLEY D.
Publisher: Entomological Society of America
ISSN: 1938-2901
Source: Annals of the Entomological Society of America, Vol.66, Iss.4, 1973-07, pp. : 895-900
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Abstract
Some developmental characteristics of Trogoderma glabrum (Herbst) are considered in relation to the biological adaptations of the species. Larvae in five different physiological states—normal, Dauer, retrogressed, regrown, and Dauer-regrown—were compared with respect to environmental stimuli controlling the induction of pupation. The responses of the larvae showed that retrogression led to a requirement not only for food but also for long-day photoperiods and the presence of males as stimuli inducing pupation of female larvae. The Dauer condition did not in itself influence competence to pupate. Retrogressive ecdyses were found to exact only very small expenditure of the larval reserves of energy and material. The function of retrogressive ecdyses is postulated to be the adjustment of body size to maintain a constant physiological state, density, and water content. Retrogression and the Dauer larval condition were compared with the diapause state as currently defined and were postulated to be unrelated to diapause or any form of dormancy.
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