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Endogenous circadian changes in orientational behaviour of Talitrus saltator

Published online by Cambridge University Press:  11 May 2009

Joan M. Edwards  and
E. Naylor
Joan M. Edwards
Affiliation:
Animal Biology Group, Marine Science Laboratories, University College of North Wales, Bangor, Gwynedd LL57 2UW
E. Naylor
Affiliation:
Animal Biology Group, Marine Science Laboratories, University College of North Wales, Bangor, Gwynedd LL57 2UW
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Abstract

Orientated navigational behaviour in Talitrus saltator (Montagu) was studied throughout the diel cycle. Amphipods released at the centre of a circular arena without an artificial horizon on the periphery showed random escape directions at all times of day. In the presence of an artificial light/dark boundary the escape direction was random at night but was towards the boundary by day. The onset of significantly orientated navigation occurred just before the time of dawn and persisted in a typically circadian manner for 7 days in amphipods kept in continuous darkness.

The phase of the circadian rhythm could be reset in altered light/dark cycles. Phase changes were directly proportional to imposed L:D phases over the range —4 to + 12 h, except that shifts from —2 to +2 h induced no phase change in the orientation rhythm. The endogenous pattern of change of orientated navigation is discussed in relation to the nocturnal endogenous locomotor activity rhythm of Talitrus and its diel pattern of foraging and burrowing behaviour on sandy beaches.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 67 , Issue 1 , February 1987 , pp. 17 - 26
Copyright
Copyright © Marine Biological Association of the United Kingdom 1987

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