Recolonisation benthique d'un sédiment dans des enceintes expérimentales replacées dans le milieu naturel (étage infralittoral d'une baie méditerranéenne, Toulon, France) = Benthic recolonization processes of defaunated sediment in experimental boxes placed in a natural environment (sublittoral zone of a Mediterranean bay, Toulon, France)
Diaz-Castaneda, V. (1987). Recolonisation benthique d'un sédiment dans des enceintes expérimentales replacées dans le milieu naturel (étage infralittoral d'une baie méditerranéenne, Toulon, France) = Benthic recolonization processes of defaunated sediment in experimental boxes placed in a natural environment (sublittoral zone of a Mediterranean bay, Toulon, France). Cah. Biol. Mar. 28(4): 551-566
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094, more
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| Abstract |
The process of recolonization of defaunated sediments (pollution, anoxia) was studied by transplanting samples of this substrate in an area of similar environmental conditions, but less polluted. Azoic sediments, from the etang de Berre, were placed in experimental boxes of about 5 dm super(3) fixed at 5 m depth in Lazaret's bay (Toulon). Two boxes were removed each month during one year; one for the chemical analyses and the other to follow the degree of colonization by macrofauna. Monthly grab samples were also taken in the area surrounding the experimental boxes to compare with the experimental populations. Results concerning lists of species and their abundance were submitted to several multi-variable numerical methods: diversity index, calculation of affinity coefficients, factorial analyses of correspondences, rank-frequency diagrams. |
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