Dernière mise à jour le : 20 janvier 1991

A comparative-study of nitrogen and carbon uptake by phytoplankton in a coastal eutrophic ecosystem (bay of Brest, france)

DESCRIPTION

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) 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.

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keyboard_arrow_right Titre : A comparative-study of nitrogen and carbon uptake by phytoplankton in a coastal eutrophic ecosystem (bay of Brest, france)
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Zeyons, C , Treguer, P , Queguiner, B , Dauchez, S
keyboard_arrow_right Date de publication : 20 janvier 1991
keyboard_arrow_right Editeur(s) : Gauthier-Villars
keyboard_arrow_right Tags thématiques : baie, eutrophisation, nitrate, azote, phytoplancton
keyboard_arrow_right Mots-clés libres : CARBON UPTAKE/EUTROPHIC ECOSYSTEM/NITROGEN UPTAKE/PARTICULATE MATTER/PHYTOPLANKTON/rade
keyboard_arrow_right Localisation : BREST
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right Collection : Oceanologica Acta
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