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An endogenous rhythm in shell deposition in Cerastoderma edule

Published online by Cambridge University Press:  11 May 2009

C. A. Richardson ,
D. J. Crisp  and
N. W. Runham
C. A. Richardson
Affiliation:
Department of Zoology, University College of North Wales, Deiniol Road, Bangor, Gwynedd and N.E.R.C. Unit of Marine Invertebrate Biology, Marine Science Laboratories, Menai Bridge, Gwynedd
D. J. Crisp
Affiliation:
Department of Zoology, University College of North Wales, Deiniol Road, Bangor, Gwynedd and N.E.R.C. Unit of Marine Invertebrate Biology, Marine Science Laboratories, Menai Bridge, Gwynedd
N. W. Runham
Affiliation:
Department of Zoology, University College of North Wales, Deiniol Road, Bangor, Gwynedd and N.E.R.C. Unit of Marine Invertebrate Biology, Marine Science Laboratories, Menai Bridge, Gwynedd
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Extract

The intertidal bivalve, Cerastoderma edule, when grown under constant conditions of temperature, salinity, water flow, light and food supply lays down faint internal shell bands at approximately semi-diurnal intervals, though with wide variations in periodicity from individual to individual. Animals grown continuously immersed under natural light/ dark cycles on a raft or below the tide marks produce similar bands. These bands are very faint compared with those in the shells of animals grown intertidally or under simulated semi-diurnal tidal conditions of emersion and immersion. The bands of intertidal animals also differ in their almost exact coincidence with the number of emersions. Cockles subjected to a diurnal cycle of immersion lay down strong bands coinciding approximately with the number of daily emersions, together with irregular faint bands. Thus the total number of bands exceeds the number of emersions.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 60 , Issue 4 , November 1980 , pp. 991 - 1004
Copyright
Copyright © Marine Biological Association of the United Kingdom 1980

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References

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