Data/hora: 01/06/2024 02:38:52

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Cartographie des biocénoses marines de Guadeloupe à partir de données SPOT (récifs coralliens, phanérogames marines, mangroves)
Autores: | Chauvaud, S; Bouchon, C; Maniere, R.
Data: | 2001
Ano: | 2001
Palavras-chave: | Télédétection; Cartographie; Récif corallien; Phanérogame marine; Mangrove; Remote sensing; Mapping; Coral reef; Seagrass; Mangrove.
Resumo: | In the framework of a comprehensive study of the coastal marine ecosystems of Guadeloupe Island (French West Indies), a remote sensing survey of marine communities was conducted in the Bay of the Grand Cul-de-Sac Marin. Pictures of SPOT satellite were used. At first sight, XS data from SPOT did not seem to be well adapted to extract information from deepest underwater areas. In the present study, a method for analysis of XS data was developed, which increases tenuous spectral differences associated to very low intensity signals. This technique led to a better distinction of objects, even the deepest ones. Reference surfaces were then identified in the field and a reliable supervised classification was conducted, which reflected the high diversity of ecological themes (up to 32) of the area to 20 m depth. A total of 23 700 ha of biota was clearly identified. Mangrove covered up to 2 700 ha. Submerged areas were constituted of 15 700 ha of soft bottoms and 3 800 ha of hard substrate bottoms. On the coral reefs, flourishing coral communities accounted only for 113 ha (11.2%). This result enhances the alarming situation of these communities in Guadeloupe. Finally, seagrass beds took up to 8 200 ha (i.e. 42% of the total sublittoral area, 58% of soft bottom substrates). This ecosystem revealed to be of primary importance within the studied area and particular attention was paid to seagrass beds of Thalassia rest testudinum. Twelve themes were retained to describe them, based on the coverage rate of the substratum by the plants and the type of the sediment colonised. The final document expresses well the high complexity of the studied area. This map constitutes a reference of the present status of the coastal benthic communities of the 'Grand Cul-de-Sac Marin' and can be useful for scientists and the administrative managers of that area. (
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00291/40267/38646.pdf

DOI:10.1016/S0399-1784(01)00079-2

http://archimer.ifremer.fr/doc/00291/40267/

Editor: | Gauthier-villars/editions Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-villars/editions Elsevier), 2001 , Vol. 24 , N. Suppl.1 , P. S3-S16

Fonte:

2001 Ifremer/CNRS/IRD/Éditions scientifiques et médicales Elsevier SAS

info:eu-repo/semantics/openAccess

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