Data/hora: 04/06/2024 09:36:16

Provedor de dados: | 5
País: | France
Título: | Hydrologie et distribution de dinophysis en juin 1988, dans la frange côtière nord-Gascogne
Autores: | Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele.
Data: | 1989-06
Ano: | 1989
Palavras-chave: | Phytoplancton; Dinophysis; Gyrodinium aureolum; Hydrologie; Sels nutritifs; Campagne côtière; Nord Gascogne; Phytoplankton; Dinophysis; Gyrodinium aureolum; Hydrology; Nutrients; Coastal cruise; Northern Biscay.
Resumo: | During the oceanographic cruise of June 1988, phytoplankton and correlated hydrological parameters were studied in the coastal area between Camaret and Ile d'Oléron. 62 stations were sampled in the 0-30 m layer within the 50 m depth limited coastal area. Observations focused on two toxic dinoflagellate species: Dinophysis spp and Gyrodinium aureolum. Dinophysis spp is more abundant in the Loire/Vilaine area, which is.characterized by high surface Nitrate levels, high 30 m depth Phosphate levels and Chlorophyll a amounts higher than elsewhere during the survey. This particuliar pattern can be related to the Nutrient outputs of Loire and Vilaine Rivers. Max. Dinophysis concentrations were observed in Vilaine bay (very high Phosphate levels) and in Douarnenez bay (no special hydrological pattern) as well as in the west of Belle-Ile, with low phytoplankton amounts and poor nutrient levels but with as trong surface stratification. G. aureolum was observed only in far-west of Brittany, with max. concentrations outside of Douarnenez bay, at - 10 m depth. No direct significative correlation was found between nutrients and either Dinophysis or Gyrodiniμm concentrations. On the other hand, both species are correlated with 20-30 m thermal gradient, more precisely, the enriched cold bottom waters and warmer surface waters discontinuity
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00432/54323/58896.pdf

http://archimer.ifremer.fr/doc/00432/54323/

Formato: | application/pdf

Fonte:

1989 Ifremer

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