Global solar radiation as the factor controlling induction of diapause in the pod midge (Dasyneura brassicae Winn.) |
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Authors: | Jørgen Aagaard Axelsen Rigmor Fink Christian Kjær |
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Institution: | National Environmental Research Institute, Department of Terrestrial Ecology, P.O. Box 314, Vejls?vej 25, DK-8600 Silkeborg, Denmark Fax: +45-89201413; e-mail jaa@dmu.dk, DK Institute of Biology, Department of Zoology, University of Aarhus, Building 135, DK-8000 Aarhus C, Denmark, DK
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Abstract: | In this paper we examine the hypothesis that diapause induction in the polyvoltine pod midge Dasyneura brassicae Winn. (Diptera: Cecidomyiidae) is controlled by cumulative global solar radiation during the larval stage. The correlation
between field observations of relative diapause for 3 years and four environmental factors (daylength, temperature, cumulative
daylight time, and cumulative global solar radiation) was investigated. The cumulative global solar radiation during the larval
stage clearly showed the strongest correlation with the observed relative diapause. It was estimated that larvae which cumulated
less than 71.1 kWh m−2 entered diapause. Compared to former theories on diapause induction in insects, this hypothesis explains how temperature
and light can function together and, furthermore, it removes the requirement for biological clock involvement in diapause
induction in insects.
Received: 21 December 1996 / Accepted: 26 February 1997 |
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Keywords: | Dasyneura brassicae Diapause induction Solar radiation |
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