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Journal of Experimental Biology 56,353-359 (1972)
Published by Company of Biologists 1972

An Analysis of a Circadian Rhythm of Oviposition in Oncopeltus Fasciatus

MARY ANN RANKIN ¹, ROY L. CALDWELL ², and HUGH DINGLE ¹

¹ Department of Zoology, University of Iowa, Iowa City, Iowa 52240
² Department of Zoology, University of Iowa, Iowa City, Iowa 52240; Department of Zoology, University of California, Berkeley, California 94720 U.S.A.

1. Oviposition in Oncopeltus fasciatus shows a daily periodicity, eggs being laid 4-10 h after light onset.

2. In constant light the inter-ovipositional interval is temperature dependent, being about 12 h at 28°C and 27 h at 23°C.

3. Ovariectomized females began to display normal ovipositional behaviour and attempt oviposition after hypertrophy of the fat body.

4. Ovariectomized females attempt to oviposit 4-10 h after light onset, just as do normal intact females, indicating that control of the time of oviposition lies, at least in part, outside the ovary.