Vertical distribution of phytoplankton communities and relationships with physico-chemical parameters resolved by a fine scale sampler

Type Poster
Date 2005
Language English
Author(s) Lunven Michel1, Guillaud Jean-Francois1, Youenou Agnes1, Crassous Marie-Pierre1, Berric Roger1, Le Gall Erwan1, Kerouel Roger1, Labry Claire1, Aminot Alain1
Affiliation(s) 1 : Ifremer, France
Meeting GEOHAB Meeting - Global Ecology and Oceanography of Harmful Algal Blooms : HABs and stratifications, UNESCO, Paris, 5-8 Decembre 2005, France
Mot-Clé(s) surveillance, littoral, phytoplancton, phycotoxine
Abstract Many studies in coastal areas have shown the existence of thin chemical and biological layers. Their thickness and vertical extension are mainly controlled by hydrological and physical forcing. An accurate description of the phytoplankton communities growing within these layers is difficult to obtain without a well-adapted sampling system. A new Fine Scale Sampler (FSS) has been designed in Ifremer in order to study phytoplankton distribution and associated dissolved properties in high stratified water column. This FSS consists in a vertical array of 15 sampling bottles, horizontally laid with 20 cm intervals. Data acquired from a CTD and Fluorescence probe provide a precise FSS positioning at the depth of highest density gradient or at chlorophyll a maximum. For two seasonal situations (spring and summer), the FSS allowed us to investigate micro-scale vertical distribution of phytoplankton species and relationships with physico-chemical parameters in the Loire estuary. For both situation, it was shown that the vertical distribution of phytoplankton communities was very variable. In summer conditions, the diatom Chaetoceros sociale was dominant in the phytoplankton peak located below the pycnocline and a thin layer of Dinophysis acuminata was detected 1 m above, in nutrient depleted conditions.
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Lunven Michel, Guillaud Jean-Francois, Youenou Agnes, Crassous Marie-Pierre, Berric Roger, Le Gall Erwan, Kerouel Roger, Labry Claire, Aminot Alain (2005). Vertical distribution of phytoplankton communities and relationships with physico-chemical parameters resolved by a fine scale sampler. GEOHAB Meeting - Global Ecology and Oceanography of Harmful Algal Blooms : HABs and stratifications, UNESCO, Paris, 5-8 Decembre 2005, France. https://archimer.ifremer.fr/doc/00144/25493/