Data/hora: 04/06/2024 11:31:51

Provedor de dados: | 5
País: | France
Título: | Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France)
Autores: | Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy.
Data: | 1998
Ano: | 1998
Palavras-chave: | Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos.
Resumo: | Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that seasonal dynamics of benthic microalgae biomass obeys a 'constant-density model' that describes the alternating spreading /shrinkage phenomenon around the few persistent patches of maximum biomass (ca 300 mg chl a m-2). Total biomass estimates were ca 13 t chl a (SE = 0.26) in June and 10 t chl a (SE = 0.28) in January. Calculating a raw approximation of the growth rate (0.1 d-l) of that biomass and considering that the total produced biomass is resuspended at flood tide, we found that microphytobenthos supplies about 2 µg chl a 1-', which corresponds to 30-90% of the chl a suspended in the water column, depending on the season. This suggests that microphytobenthos could be a major food source for secondary producers in both pelagic and benthic ecosystems of the Marennes-Oleron Bay.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/1998/publication-3820.pdf

https://archimer.ifremer.fr/doc/00000/3820/

Editor: | Inter-Research
Formato: | application/pdf
Fonte: | Marine Ecology Progress Series (depuis 2001) (Inter-Research), 1998 , Vol. 166 , P. 131-141

Fonte:

Inter-Research

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