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Factorial Analysis in the Ecology of Rocky Subtidal Areas Near Brest (West Brittany, France)

Published online by Cambridge University Press:  11 May 2009

A. Castric  and
C. Chasse
A. Castric
Affiliation:
Laboratoire de Biologie Marine du College de France, 29900 Concarneau, France
C. Chasse
Affiliation:
Laboratoire d'Oceanographie Biologique, Universite de Bretagne Occidentale, 29187 Brest Cedex, France
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Extract

In order to investigate the characteristic species and the relative importance of selected environmental conditions of rocky bottom communities in coastal waters and to estimate their richness, 27 sites in the Brest area were surveyed by diving. The abundances of underwater species, from a check-list of 115, were plotted as number of individuals or colonies in m2 or in percentage cover of the rock, against the environmental conditions (depth, bedrock slope, substrate type and sediment nature of the nearest soft bottom). Raw data were converted to biovolume expressed as mm3 m–2 and expressed as log 10 (x + 1).

Various correspondence analyses were applied to these data: the first included bedrock slope (lit/dark surfaces) and takes into account the four biological formations according to the depth. It shows zonation with depth and decreasing light as factor 1, hydrodynamic conditions (waves or current) as factor 2, mixing of estuarine and oceanic waters as factor 3 and turbidity as factor 4. Four species assemblages emerge from these four axes, for which the main species contributing to the four axes may be considered as characteristic species. These correspond well to four broad communities described in British waters: very exposed to wave-action, semi-exposed to wave-action, exposed to strong tidal current, very sheltered sites. The second analysis, in which lit and dark surfaces are distinguished, but some very close sites are fused together, shows in detail the photophilous or sciaphilous nature of the species. Values of hydrodynamic conditions and percentage of surface light plotted on the 'stations-points' of the graphs allow drawing of a factorial network which may be used as hydrodynamic and illumination scales.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 71 , Issue 3 , August 1991 , pp. 515 - 536
Copyright
Copyright © Marine Biological Association of the United Kingdom 1991

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