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Infestation by excavating sponges on the oyster (Ostrea edulis) populations of the Blanes littoral zone (north-western Mediterranean Sea)

Published online by Cambridge University Press:  04 April 2001

Dolors Rosell ,
Maria-Jesús Uriz  and
Daniel Martin
Dolors Rosell
Affiliation:
Centre d'Estudis Avançats de Blanes, Camí de Santa Bàrbara, s/n, 17300 Blanes, Girona, Spainrosell@ceab.csic.es
Maria-Jesús Uriz
Affiliation:
Centre d'Estudis Avançats de Blanes, Camí de Santa Bàrbara, s/n, 17300 Blanes, Girona, Spainrosell@ceab.csic.es
Daniel Martin
Affiliation:
Centre d'Estudis Avançats de Blanes, Camí de Santa Bàrbara, s/n, 17300 Blanes, Girona, Spainrosell@ceab.csic.es
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Abstract

In order to estimate the degree of implantation of excavating sponges in the oyster populations from the littoral zone at Blanes (north-western Mediterranean Sea), a representative sample of oysters (Ostrea edulis) was collected from depths between 0.5 and 4 m in 1986. All oysters were infested by the excavating sponges Cliona viridis and Cliona celata. Infestation affected always and exclusively the lower valve always reaching the inner side. The degree of infestation proved to be independent of oyster size and weight. Colonization by contact was considered the main means of dispersion of these sponges within the oyster population. Cliona viridis and C. celata emerged as the single excavating species able to effectively compete with other non-excavating or excavating organisms when trying to colonize the particular calcareous substrate provided by oyster shells in the north-western Mediterranean Sea.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 79 , Issue 3 , June 1999 , pp. 409 - 413
Copyright
© 1999 Marine Biological Association of the United Kingdom

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