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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Microphytobenthos and phytoplankton in Banyuls bay (Gulf of Lions): standing stocks and hydroclimatic factors (1998)
Auteurs :	C. Riaux-Gobin, Auteur ; G. Vetion, Auteur ; J. Neveux, Auteur ; J. C. Duchene, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (48(1) mars 1998)
Article en page(s) :	1-13
Langues:	Anglais
Résumé :	A three year survey of the microphytobenthic biomass in Banyuls bay (Gulf of Lions) was performed from May 1990 to March 1993. The sediments investigated had different characteristics in granulometry and bathymetry: from shallow sands to a deeper muddy sediment. In order to establish comparisons between pelagic and benthic microphytic biomasses and their temporal variations, the phytoplankton standing crop was also measured in the bay. A geographical gradient appeared: the highest benthic biomasses were associated to the muddy sediment (P(5), 32 m deep: on an average 2.5 mu g Chl a g(-1) sediment Dry Weight, 5 mu g Phaeo a g(-1) DW; 7.5 mg Chl a m(-2)), 2 whereas very low pigment concentrations characterized the sands - 5 to 20 m deep - (on an average 1 mu g Chl a g(-1) DW, 0.5-1 mu g Phaeo a g(-1) DW; 7 mg Chl a m(-2)). A seasonal trend, well marqued at Ps, but also at the other stations, was evidenced. These temporal variations are characterized by a summer maximum: up to 1 mu g Chl a g(-1) DW in the sands and more than 4 at Ps, when expressed by surface units it corresponds to 14 mg Chi a m(-2) in sands and 18 mg Chl a m(-2) in the P(5) muddy sediment. These pigment concentrations are relatively low. Chi a and Phaeo a variations are simultaneous in the sands and disynchronous at P(5). Some hydroclimatic parameters (temperature, insolation, wind and roughness of sea) are illustrated and their variations compared to those of pigment concentrations in the sediments. The summer increase of the microphytobenthic biomass may be related to the stability of the substratum and the high level of insolation. The seasonal variations of phytoplankton biomass are quite different: decrease in pigment concentrations in summer and increase in winter (up to 2 mu g Chl a l(-1); annual mean concentration: 0.7 mu g Chl a l(-1) corresponding to
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/images/Archives_1950-2002/vie-et-milieu/VOLUME_1998_48_fasc1.pdf

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