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Demographic structure suggests migration of the sea urchin Paracentrotus lividus in a coastal lagoon

Published online by Cambridge University Press:  14 June 2001

Catherine Fernandez ,
Angela Caltagirone  and
Monique Johnson
Catherine Fernandez
Affiliation:
EqEL, Université de Corse BP52, 20250 Corte, France
Angela Caltagirone
Affiliation:
UMR DIMAR 3, COM, Université de la Méditerranée, Case 901, 13288 Marseille Cedex 9, France
Monique Johnson
Affiliation:
EqEL, Université de Corse BP52, 20250 Corte, France
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Abstract

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The demographic structure of a population of Paracentrotus lividus living in a coastal Mediterranean lagoon was studied in 1990. Analysis of this structure revealed that the population examined was made up of four distinct cohorts which represented individuals 2, 3, 4 and over 4 y of age. The variability in demographic structure as a function of biotope revealed that sea urchin migration occurred from the pebble area (recruitment area, high sea urchin density and overgrazing facies) towards areas made up of Cymodocea nodosa sea grass beds (growth areas, low density and abundant prefered food). These migrations seem to have been caused by food limitation in the former biotope coupled with a shift in diet in young individuals.

Type
Brief Report
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 81 , Issue 2 , April 2001 , pp. 361 - 362
Copyright
2001 Marine Biological Association of the United Kingdom