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

Provedor de dados: 	5	
País: 	France	
Título: 	Monthly HPLC measurements of pigment concentration from an intertidal muddy sediment of Marennes-Oléron Bay, France	
Autores: 	Cariou-le Gall, Valerie; Blanchard, Gerard.	
Data: 	1995-05	
Ano: 	1995	
Palavras-chave: 	Pigment; HPLC; Intertidal mudflat; Microphytobenthos; Seasonal change.	
Resumo: 	Chloropigments and carotenoids were measured by HPLC in an intertidal muddy sediment of Marennes-Oleron Bay (France). Concentrations were determined as a function of sediment depth at low tide. The analyses were carried out at monthly intervals over 1 yr. Pigment analysis indicated that the microphytobenthic community was dominated by diatoms throughout the sampling year. Chlorophyll b was not encountered at any time or depth, indicating that no input from macrophytic detritus had occurred at the sampling site. There was a large pool of phaeopigments a, of which phaeophorbides were the major forms (75%). A microphytobenthic bloom occurred between March and June during which phaeopigments significantly increased with a high proportion of phaeophorbides likely due to intense grazing activity of benthic invertebrates. Pigment concentrations were still high at 5 cm depth and changes occurred simultaneously in the aphotic (&lt;5 mm sediment depth) and photic (&gt;5 mm sediment depth) layers of the sediment, reflecting an impact of bioturbation and physical mixing (resuspension/redeposition) of the upper sediment layer. There was a decrease of the pigment content of the sediment between June and July. It was attributed to grazing and to a resuspension event. Overall, the pigment analysis of this intertidal sediment indicates a predominance of the diatom community, a close coupling between the dynamics of microphytobenthos biomass and the grazing activity of benthic invertebrates, and the influence of sediment mixing.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00257/36844/36666.pdf

http://archimer.ifremer.fr/doc/00257/36844/	
Editor: 	Inter-research	
Formato: 	application/pdf	
Fonte: 	Marine Ecology Progress Series (0171-8630) (Inter-research), 1995-05 , Vol. 121 , N. 1-3 , P. 171-179	
Fonte: 	Inter-Research 1995

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