Variability of energy density among mesozooplankton community: new insights in functional diversity to forage fish

Type Article
Date 2018-09
Language English
Author(s) Dessier Aurelie1, Dupuy Christine1, Kerric Anais1, Mornet Francoise2, Authier Matthieu3, Bustamante Paco1, Spitz Jerome3
Affiliation(s) 1 : Univ La Rochelle, CNRS, UMR 7266, Littoral Environm & Soc LIENSs, 2 Rue Olympe de Gouges, F-17042 La Rochelle 01, France.
2 : IFREMER, Unite Halieut Gascogne Sud HGS, Stn La Rochelle, Pl Gaby Coll, F-17087 Lhoumeau, France.
3 : Univ La Rochelle, CNRS, UMS 3462, Observ PELAGIS Syst Observat Conservat Mammiferes, F-17071 La Rochelle, France.
Source Progress In Oceanography (0079-6611) (Pergamon-elsevier Science Ltd), 2018-09 , Vol. 166 , P. 121-128
DOI 10.1016/j.pocean.2017.10.009
WOS© Times Cited 7
Keyword(s) Bay of Biscay, Profitability, Copepods, Prey-predator relationship, Fisheries
Abstract

To explore some aspects of mesozooplankton functional diversity, this study quantified energy density during the springtime in the Bay of Biscay both between different species and between different size-classes. Energy densities of copepod species (Centropages typicus, Anomalocera patersoni, Calanus helgolandicus, and Labidocera wollastoni), as well as anchovy eggs (Engraulis encrasicolus) ranged from 0.5 to 6.7 kJ/g wet weight (ww). Considering size-classes, energy densities varied from 0.74 to 1.26 kJ/g ww. Energy density of C. helgolandicus exhibited a spatial pattern with the highest values in the plume of the Gironde estuary. In contrast, no spatial pattern of energy density has been detected considering size-classes. Our results showed that the mesozooplankton cannot be considered as a homogeneous resource in terms of quality. During spring, some species and some geographical areas seem thus to be more profitable to predators than others. We argued that the energy density is a key functional trait of mesozooplankton species. Finally, we discussed how interspecific and spatial variability of energy density among the mesozooplankton community can have important implications on fish population dynamics.

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