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Investigation into the ecology of the ormer (Haliotis tuberculata L.), factors influencing spatial distribution

Published online by Cambridge University Press:  15 October 1989

Jacques Clavier  and
Pierre Chardy
Jacques Clavier
Affiliation:
ORSTOM, Centre de Nouméa, BP n° A5 , Nouméa, Nouvelle-Calédonie
Pierre Chardy
Affiliation:
IFREMER, Centre de Brest, BP n° 70, 29280 Plouzané, France
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Abstract

The factors affecting spatial distribution of the ormer (Haliotis tuberculata L.) in the vicinity of Saint-Malo (northern Brittany, France) are analyzed using a multivariate approach. A correspondence analysis is applied to a contingency table based on 200 samples. Ormers are always absent from smooth rocky substrata, exposed to a strong current or deeper than 8 m below low chart datum. Abundance and biomass of H. tuberculata are distributed along a gradient correlated with an increasing complexity of habitat and a reduction of current. Otherwise, no correlation has been found between characteristics of ormer distribution and surge, depth or large and turf algae.

Keywords

HaliotisBrittanyecologyspatial distributioncorrespondence analysisHaliotisBretagnerépartition spatialeanalyse factorielle des correspondances
Type
Research Article
Information
Aquatic Living Resources , Volume 2 , Issue 4 , October 1989 , pp. 191 - 197
Copyright
© IFREMER-Gauthier-Villars, 1989

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