Data/hora: 07/06/2024 04:35:11

Provedor de dados: | 5
País: | France
Título: | Oceanologic study of an open coastal area in the Ionian sea with emphasis on its benthic fauna and some zoogeographical remarks
Autores: | Zenetos, A; Christianidis, S; Pancucci, Ma; Simboura, N; Tziavos, C.
Data: | 1997
Ano: | 1997
Palavras-chave: | Macrobenthos; Zoogeography; Physical oceanography; Sedimentology; Ionian Sea.
Resumo: | The macrobenthic faunal composition, sedimentology and physical characteristics were investigated in an open coastal area of the Greek Ionian Sea. Hydrographic parameters were recorded at 26 stations using a CTD profiler during nine cruises performed between 1990 and 1991, while benthic samples were collected in November 1990 and April 1991 at 22 stations with the aid of a Ponar grab. Macrobenthic variety indicated an area of high scientific interest : 351 species in all, 18 of which are new to the Creek fauna. Furthermore, 10 species are previously unrecorded in the Eastern Mediterranean. Of the biological indices estimated, species richness was comparable to that of other open Greek areas, while population density seemed to be a function of a) depth and b) degree of enclosure. Community diversity and evenness of distribution varied within a great range. The minimal values which were noticed at the stations situated in front of the Amvrakikos Gulf opening can be attributed to the outflow of eutrophic waters from the Gulf of Amvrakikos in combination with the area's hydrodynamism and bottom topography. The absence of Sine sediments at the shallow stations is indicative of a high energy regime as opposed to the high percentages of fines dominating at the deeper stations. The area's water masses are mainly of Atlantic origin with some mixing of Levantine Intermediate Water at the deeper layers. Outflow of less saline water from Amvrakikos Gulf was observed during winter and spring. Classification analysis, based on the faunal composition, produced four groups corresponding to different depth zones. However, due to the heterogeneity of sediment types within each group, the biocoenotic approach showed a muddy biocoenosis only for the deeper group - associated with the biotope of the generally accepted Mediterranean muddy detritus (DE) biocoenosis and that of coastal terrigenous muds (VTC) - while the other groups presented a more complex physiognomy.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00093/20408/18075.pdf
Editor: | Gauthier-Villars
Relação: | http://archimer.ifremer.fr/doc/00093/20408/
Formato: | application/pdf
Fonte: | Oceanolica Acta (0399-1784) (Gauthier-Villars), 1997 , Vol. 20 , N. 2 , P. 437-451