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Age and growth of the echinoid Sphaerechinus granularis from the Algerian coast

Published online by Cambridge University Press:  01 December 1999

Dina Lila Soualili ,
Monique Guillou  and
Rachid Semroud
Dina Lila Soualili
Affiliation:
Laboratoire de Biologie et d'Ecologie Marine, Université des Sciences et de la Technologie Houari Boumedienne, Institut des Sciences de la Nature, 16000 Alger, Algérie
Monique Guillou
Affiliation:
Laboratoire Bioflux, UMR CNRS 6539, Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané, France
Rachid Semroud
Affiliation:
Institut des Sciences de la Mer et de l'Aménagement du littoral, BP.54, Sidi Fredj 42321 W.Tipaza, Algérie
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Abstract

The growth bands in the plates of the echinoid Spharechinus granularis settled on the Algerian coast were analysed. Two distinct groups of sea urchins were identified with different growth patterns related to the period of recruitment, i.e. spring or autumn. The growth rate of the autumn cohort was higher over the year following the first winter after settlement. From the second winter there was little growth difference between the two cohorts. Compared to populations from Atlantic sites, the Algerian population has a lower growth rate and reduced longevity.

Type
Brief Report
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 79 , Issue 6 , December 1999 , pp. 1139 - 1140
Copyright
© 1999 Marine Biological Association of the United Kingdom

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