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| Meinesz, Alexandre; Belsher, Thomas; Boudouresque, Charles-françois; Lefevre, Jean-robert. |
| A Spot satellite image was processed to assess the suitability of this facility for the cartography of epibenthic populations and bottom types in the Mediterranean sublittoral fringe. The area studied was on the north coast of Porquerolles island (Hyeres, SE France). The treated data were compared with mapping carried out by diving. We show that satellite remote sensing may permit a distinction between certain epibenthic populations and bottom types down to 10 m depth. Thus the usefulness of the satellite is reduced where the sublittoral is steeply shelving, as the mappable area is narrow and represented by only a few pixels, each of which tends to overlap several separate biocoenoses. The image treated was obtained in June under very favourable... |
| Tipo: Text |
Palavras-chave: POSIDONIA-OCEANICA; MAPPING; REMOTE SENSING; SPOT. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00183/29397/27762.pdf |
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| De Vaugelas, Jean; Meinesz, Alexandre; Antolic, Boris; Ballesteros, Enrique; Belsher, Thomas; Cassar, Nicolas; Ceccherelli, Giulia; Cinelli, Francesco; Cottalorda, Jean-michel; Orestano, Carla Fradà; Grau, Antoni; Jaklin, Andrej; Morucci, Carlo; Relini, Marco; Sandulli, Roberto; Span, Ante; Tripaldi, Giuseppe; Van Klaveren, Patrick; Zavodnik, Nevenka; Zuljevic, Ante. |
| Fourteen years after the first observation of Caulerpa taxifolia (Valh) C. Agardh in the northwestern Mediterranean Sea, this green alga of tropical origin is now present in five countries (Spain, France, Monaco, Italy and Croatia). By the end of 1997, more than 46 km(2), at depths of between 0 and 50 m, were found to be affected by this expansion. A standardization of the cartographic procedure is proposed here. Such a standardization is necessary to compare maps produced by various organizations from different countries. For a given independent station, it is based on the definition of three levels of colonization:Level I refers to a station where one or several colonies less than 100 m apart cover a total surface area inferior to 1000 m(2):Level II... |
| Tipo: Text |
Palavras-chave: Mediterranean Sea; Invasive species; Standardization; Caulerpa taxifolia; Cartography; Mer Méditerranée; Espèces envahissantes; Standardisation; Caulerpa taxifolia; Mediterranean Seacartographie. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/1999/publication-837.pdf |
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