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Non-Dissective Pupal Indicators of Diapause Commitment in the Small Ermine Moth of Orpine, Yponomeuta Vigintipunctatus

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

In the long-day insect Yponomeuta vigintipunctatus the critical photoperiod (at 20°C) for the induction of pupal diapause lies between LD 16:8 and 17:7 for a Dutch and between LD 15:9 and 16:8 for a French population. Diapause commitment could only be ascertained by the simultaneous application of three non-dissective pupal characteristics, viz. duration of pupal development, relative weight loss and eye pigmentation. This method practically eliminated the uncertainty as to the status of individuals showing pupal characteristics, intermediate to those found in diapause and non-diapause samples.

Affiliations: 1: Department of Population Biology, University of Leiden, P. O. Box 9516, 2300 RA Leiden, The Netherlands


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