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Journal of Biological Rhythms
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The Same Photoperiodic Clock May Control Induction and Maintenance of Diapause in the Spider Mite Tetranchus urticae

D.S. Koveos

Department of Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands

A. Kroon

Department of Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands

A. Veerman

Department of Pure and Applied Ecology, Section Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands

In the spider mite Tetranychus urticae, both diapause induction (which takes place during the larval and nymphal stages) and diapause maintenance (in the adult female) are under photoperiodic control. The question of whether or not the same photoperiodic clock is involved in both photoperiodic reactions was investigated in eight strains of the spider mite, originating from different localities in Europe. The methods employed consisted of (1) determination of the relative importance of the photophase and scotophase in the two photoperiodic reactions; (2) comparison of photoperiodic response curves for diapause induction and diapause maintenance; and (3) determination of the effect of light breaks on the capacity of long nights to maintain diapause, and comparison with the effect of light breaks in diapause induction experiments.

Key Words: photoperiodism • diapause • geographic strains • spider mites • Acarina • Tetranychidae • Tetranychus urticae

Journal of Biological Rhythms, Vol. 8, No. 4, 265-282 (1993)
DOI: 10.1177/074873049300800401
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