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Possible natural circaseptan rhythm in the beach beetle Chaerodes trachyscelides White

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Meyer-Rochow V. B., Brown P. J.

Acta Neurobiologiae Experimentalis

1998

vol. 58

issue 4

287-290

Activity rhythms in groups of captive beach beetles (Chaerodes trachyscelides White) have been recorded in an actograph over a period of 29 days. Under constant illumination and when no sand was provided for the beetles to burrow in abnormal behaviour occurred. With sand and in constant darkness a strictly nocturnal activity period with apparently circaseptan components superimposed was observed. The beetles in their natural habitat are confined to the debris zone where they feed on washed up seaweed and this debris zone moves up and down depending on the heights of the tides. Circaseptan elements in the beetles' activity may act as adaptations to the weekly alternations between spring- and neap-tides.

Clock-spiking cells not only in the eye of the fly, but also in the antenna!

100%

Moro S. D., Huotari M.

Acta Neurobiologiae Experimentalis

1998

vol. 58

issue 4

277-281

During the course of single cell olfactory recordings from the funicular part of the antenna of Drosophila virilis we encountered a pair of cells firing synchronously and consistently at a rate of about 9 to 14 spikes per second. Every spike was seen to consist of a spike complex made up of two separate biphasic components thought to originate from two separate cells. The larger action potential, appearing first, had a peak-to-peak (ptp) amplitude of up to 200 mV followed closely by a smaller spike with an amplitude of about 60 mV. The repetitive firing pattern was not affected by air or odour puffs. This kind of consistent spontaneous spiking activity of two closely associated cells resembles remarkably closely the clock-spikes hitherto known only from the eyes of flies. Our encounter with such cells in a sense organ other than the eye poses many new questions and could lead to a renewed effort to understand the role(s) of the clock-spiking cells as possible oscillatory components of the dipteran pacemaking system in particular and the insect nervous systems, generally.

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2 Acta Neurobiologiae Experimentalis

2 1998

1 Brown P. J.

1 Huotari M.

1 Meyer-Rochow V. B.

1 Moro S. D.

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Possible natural circaseptan rhythm in the beach beetle Chaerodes trachyscelides White

Clock-spiking cells not only in the eye of the fly, but also in the antenna!