Data/hora: 01/06/2024 12:07:18

Provedor de dados: | 5
País: | France
Título: | A comparative-study of nitrogen and carbon uptake by phytoplankton in a coastal eutrophic ecosystem (bay of Brest, france)
Autores: | Dauchez, S; Queguiner, B; Treguer, P; Zeyons, C.
Data: | 1991
Ano: | 1991
Palavras-chave: | CARBON UPTAKE; EUTROPHIC ECOSYSTEM; NITROGEN UPTAKE; PARTICULATE MATTER; PHYTOPLANKTON.
Resumo: | Nitrogen (N-15) and carbon (C-14) uptake rates and hydrological, chemical and biological parameters were monitored at a single station during spring (March-April 1989) in a coastal eutrophic ecosystem of western Europe : the Bay of Brest. Before the spring growth of phytoplankton populations, total nitrogen and carbon uptake rates were low (almost-equal-to 0.3-mu-mol C.1(-1).h-1 and almost-equal-to 0.025-mu-mol N.l(-1).h-1). During the spring bloom, these uptake rates reached high values (0.5-mu-mol C.1(-1).h-1 and 0.28-mu-mol N.1(-1).h-1); at this time, nitrate was the main source of nitrogen production, although relative preference index (RPI) values showed that ammonium was the preferred nitrogen form for phytoplankton (RPI (NO3) &lt; 1 ; RPI (NH4) &gt; 5). C/N assimilation ratios were higher than C/N composition ratios of the particulate matter. This difference is interpreted in terms of terrestrial detritus inputs from rivers and variation of the physiological state of phytoplankton populations.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00102/21282/18891.pdf
Editor: | Gauthier-Villars
Relação: | http://archimer.ifremer.fr/doc/00102/21282/
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 1 , P. 87-95