Data/hora: 01/06/2024 05:34:13

Provedor de dados: | 5
País: | France
Título: | Habitats et communautés benthiques du bassin oriental de la Manche : état des lieux au début du XXIe siècle
Autores: | Foveau, Aurelie.
Data: | 2009-12-14
Ano: | 2009
Palavras-chave: | Bassin oriental de la Manche; Couverture sédimentaire; Communautés benthiques; Diversité; Modélisation d’habitats; Comparaison; Eastern English Channel; Sedimentary cover; Benthic communities; Diversity; Habitat modeling; Comparison.
Resumo: | This study is devoted in providing an updated knowledge on the macrobenthic community structure and biodiversity in the eastern English Channel in the early 2000s. Results obtained were compared with results obtained by L. Cabioch and colleagues for the period of 1971-1976. The distribution of macrobenthic communities is highly governed by the sedimentary cover. The Folk classification was used for sedimentology and mapping of bottom type characterization for the two study periods. A relative stability of the sedimentary cover was observed wherein 69% of the study area showed slight or no change in sedimentary cover. This is mainly due to the hydrodynamics in the area which is the dominant structuring factor in the eastern English Channel. Variations were observed in bays, near the mouth of the estuaries and in the sand bank areas. The macrobenthic communities were studied separately for each period then compared. However, due to differences in methodologies applied for each period, the comparison, in the strict sense of the word, is impossible. Geographical mapping results revealed that four entities or communities seemed recurrent in time depending on sediment type associations: (1) medium sand; (2) coarse sand; (3) sandy gravel and (4) pebbles. Analysis showed that the various geographical entities, constituting the two latter sediment type associations, are distinct at the scale of the eastern English Channel. Study of the biological diversity showed that the eastern English Channel is a rich (875 taxa identified from 318 sampled sites) and diverse (Shannon index until 6 bits) area. But the richness is still underestimated. Finally, statistical methods were applied to modeling and predicting potential habitats of 22 benthic invertebrates. Habitat modeling results obtained were in accordance with field observations and showed that for the majority of considered species (medium and fine sand-associated species excluded) occupy their suitable habitats.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00083/19474/17089.pdf
Editor: | Université Lille 1
Relação: | http://archimer.ifremer.fr/doc/00083/19474/
Formato: | application/pdf
Fonte: | 2009 the author, Univ. Lille 1