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|Title:||Picophytoplankton Diversity and Photoacclimation in the Strait of Sicily (Mediterranean Sea) in Summer. I. Mesoscale Variations|
|Authors:||BRUNET Christophe; CASOTTI Raffaella; VANTREPOTTE VINCENT; CORATO F; CONVERSANO F.|
|Citation:||AQUATIC MICROBIAL ECOLOGY vol. 44 p. 127-141|
|Type:||Articles in periodicals and books|
|Abstract:||Phytoplankton dynamics were investigated at the mesoscale in the northern part of the Strait of Sicily in July-August 1997 on fractionated samples (<3 µm and >3 µm) using high performance liquid chromatography (HPLC) pigment analysis and flow cytometry. Distribution, diversity and photoacclimation varied within the different water masses and features present at the time of sampling, including a surface filament of deep, cold water. Picophytoplankton (<3 µm) accounted for 80% of total chlorophyll on average and was numerically dominated by cyanobacteria of the genus Prochlorococcus, with an average concentration of 5.2 x 104 cell ml-1. The biomass and pigment diversity of the picophytoplankton was higher in the deep chlorophyll maximum (DCM) and was related to hydrological and biological features, while larger phytoplankton (>3 µm) appeared to respond to different cues. Chlorophyll pigment content per cell of Synechococcus, Prochlorococcus or picoeukaryotes was estimated by coupling pigment data with flow cytometric counts.|
|JRC Directorate:||Sustainable Resources|
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