Spring-time zooplankton size structure over the continental shelf of the Bay of Biscay
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AuthorsVandromme, P. (Pieter); Nogueira, E. (Enrique); Huret, M. (Martin); López-Urrutia-Lorente, Á. (Ángel); González-Nuevo, G. (Gonzalo); Sourisseau, M. (Marc); Petitgas, P. (Pierre)
LOPC (laser optical plankton counter)
Bay of Biscay
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 information regarding zooplankton in terms of flux of energy lies in its size structure. In this study, an extensive dataset 5 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 parti10 cles within 100–2000 μm of spherical equivalent diameter (ESD), whereas the WP2/ZooScan allows counting, sizing and identification of zooplankton from 400 μm ESD. The difference between the LOPC (all particles) and the WP2/ZooScan (zooplankton ...
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