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Springtime zooplankton size structure over the continental shelf of the Bay of Biscay ArchiMer
Vandromme, Pierre; Nogueira, Enrique; Huret, Martin; Lopez-urrutia, Angel; Gonzalez-nuevo Gonzalez, G.; Sourisseau, Marc; Petitgas, Pierre.
Linking lower and higher trophic levels requires special focus on the essential role played by mid-trophic levels, i.e., the zooplankton. One of the most relevant pieces of information regarding zooplankton in terms of flux of energy lies in its size structure. In this study, an extensive data set of size measurements is presented, covering parts of the western European continental shelf and slope, from the Galician coast to the Ushant front, during the springs from 2005 to 2012. Zooplankton size spectra were estimated using measurements carried out in situ with the Laser Optical Plankton Counter (LOPC) and with an image analysis of WP2 net samples (200 μm mesh size) performed following the ZooScan methodology. The LOPC counts and sizes particles within...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00221/33246/31744.pdf
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Decadal variability in chlorophyll and primary production off NW Spain ArchiMer
Bode, Antonio; Anadón, Ricardo; Anxelu G. Morán, Xosé; Nogueira, Enrique; Teira, Eva; Varela, Manuel.
Long-term variability of phytoplankton biomass (chlorophyll a) and primary production (carbon fixation) in relation to changes in climatic and oceanographic factors was analysed for oceanic and shelf waters of the north and northwest Iberian Peninsula. Changes related to stratification in the water column and upwelling intensity were specifically addressed. The time series include measurements of primary production and biomass over 19 yr. Seasonally, the main mode of temporal variability of the series is the occurrence of phytoplankton blooms during the winter-spring and summer- autumn transition periods. On the northwestern coast (Galicia), the blooms are more frequent and attain higher biomass and production values than on the northern coast (Mar...
Tipo: Text Palavras-chave: Primary production; Upwelling; Climate change; Nutrients; Remineralisation; NE Atlantic.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00052/16356/13862.pdf
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