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With increasing soil depth, the diel temperature amplitude gradually decreases and the phase of the temperature cycle is delayed. The onion fly Delia antiqua (Meigen) (Diptera: Anthomyiidae), which pupates at a soil depth of 2–20 cm, advances the eclosion phase of its circadian rhythm as the temperature amplitude decreases. This ‘temperature amplitude response’ is considered to allow pupae located...
Soil temperature cycles are considered to play an important role in the entrainment of circadian clocks of underground insects. However, because of the low conductivity of soil, temperature cycles are gradually dampened and the phase of the temperature cycle is delayed with increasing soil depth. The onion fly, Delia antiqua, pupates at various soil depths, and its eclosion is timed by a circadian...
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