Springtime zooplankton size structure over the continental shelf of the Bay of Biscay

Type Article
Date 2014
Language English
Author(s) Vandromme Pierre1, 6, Nogueira Enrique2, Huret MartinORCID3, Lopez-Urrutia Angel2, Gonzalez-Nuevo Gonzalez G.4, Sourisseau Marc1, Petitgas Pierre5
Affiliation(s) 1 : IFREMER, Ctr Brest, Dept Dynam Environm Cotier, F-29280 Plouzane, France.
2 : Inst Espanol Oceanog, Ctr Oceanog Gijon, Gijon 33212, Spain.
3 : IFREMER, Ctr Brest, Unit Sci & Tech Halieut, F-29280 Plouzane, France.
4 : Inst Espanol Oceanog, Ctr Oceanog Vigo, Vigo 36200, Spain.
5 : IFREMER, Ctr Nantes, Dept Ecol & Modeles Halieut, F-44300 Nantes, France.
6 : Helmholtz Ctr Ocean Sci, GEOMAR, D-24105 Kiel, Germany.
Source Ocean Science (1812-0784) (Copernicus Gesellschaft Mbh), 2014 , Vol. 10 , N. 5 , P. 821-835
DOI 10.5194/os-10-821-2014
WOS© Times Cited 22
Abstract 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 100–2000 μm of spherical equivalent diameter (ESD), whereas the WP2/ZooScan allows for counting, sizing and identification of zooplankton from ~ 400 μm ESD. The difference between the LOPC (all particles) and the WP2/ZooScan (zooplankton only) was assumed to provide the size distribution of non-living particles, whose descriptors were related to a set of explanatory variables (including physical, biological and geographic descriptors). A statistical correction based on these explanatory variables was further applied to the LOPC size distribution in order to remove the non-living particles part, and therefore estimate the size distribution of zooplankton. This extensive data set provides relevant information about the zooplankton size distribution variability, productivity and trophic transfer efficiency in the pelagic ecosystem of the Bay of Biscay at a regional and interannual scale.
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Vandromme Pierre, Nogueira Enrique, Huret Martin, Lopez-Urrutia Angel, Gonzalez-Nuevo Gonzalez G., Sourisseau Marc, Petitgas Pierre (2014). Springtime zooplankton size structure over the continental shelf of the Bay of Biscay. Ocean Science, 10(5), 821-835. Publisher's official version : https://doi.org/10.5194/os-10-821-2014 , Open Access version : https://archimer.ifremer.fr/doc/00221/33246/