Reproduction and growth of Sphaerechinus granularis (Echinodermata: Echinoidea) in southern Brittany

Although the English Channel is the northern limit of the latitudinal range of Sphaerechinus granularis (Echinodermata: Echinoidea), this echinoid can produce locally high densities in Brittany, such as in the Glénan Archipelago (Bay of Concarneau) where a small-scale fishery has been exploited sinc...

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Bibliographic Details
Published in:Journal of the Marine Biological Association of the United Kingdom 1993-02, Vol.73 (1), p.179-192
Main Authors: Guillou, Monique, Michel, Christine
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Biological and medical sciences
Demecology
Echinoidea
Fundamental and applied biological sciences. Psychology
Marine
Protozoa. Invertebrata
Sphaerechinus granularis
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Summary:Although the English Channel is the northern limit of the latitudinal range of Sphaerechinus granularis (Echinodermata: Echinoidea), this echinoid can produce locally high densities in Brittany, such as in the Glénan Archipelago (Bay of Concarneau) where a small-scale fishery has been exploited since 1985. The reproductive cycle, the growth patterns and the migration of the species in this area were studied from 1988 to 1992. Sphaerechinus granularis presents an annual reproductive cycle with a major spawning in the early spring. But inter annual variability in the time when spawning starts can be observed. A relationship is established between the date of onset of spawning and the climatic conditions during the whole period of gonadal growth. Recruitment is isolated in time and reflects the reproductive cycle.
ISSN:0025-3154
1469-7769
DOI:10.1017/S0025315400032719