Trophic pathways of phytoplankton size classes through the zooplankton food-web over the spring transition period in the north-west Mediterranean Sea
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2017 |
| Auteurs (7) | : | HUNT Brian,p,v CARLOTTI François DONOSO Katty PAGANO M D'ORTENZIO Fabrizio TAILLANDIER Vincent CONAN Pascal |
| Revue scientifique | : | Journal of Geophysical Research-Oceans |
| Volume | : | |
| Fascicule | : | |
| Pages | : | |
| DOI | : | 10.1002/2016JC012658 |
| URL | : | http://dx.doi.org/10.1002/2016jc012658 |
| Abstract | : | Knowledge of the relative contributions of phytoplankton size classes to zooplankton biomass is necessary to understand food-web functioning and response to climate change. During the DEep Water formation EXperiment (DEWEX), conducted in the north-west Mediterranean Sea in winter (February) and spring (April) of 2013, we investigated phytoplankton-zooplankton trophic links in contrasting oligotrophic and eutrophic conditions. Size fractionated particulate matter (pico, nano and micro POM) and zooplankton (64 to > 4000 μm) composition and carbon and nitrogen stable isotope ratios were measured inside and outside of the nutrient rich deep convection zone in the central Liguro-Provencal basin. In winter, phytoplankton biomass was low (0.28 mg.m−3) and evenly spread among pico, nano and micro phytoplankton. Using an isotope mixing model we estimated average contributions to zooplankton biomass by pico, nano and micro POM of 28, 59 and 15% respectively. In spring, the nutrient poor region outside of the convection zone had low phytoplankton biomass (0.58 mg.m−3) and was dominated by pico/nano phytoplankton. Estimated average contributions to zooplankton biomass by pico, nano and micro POM were 64, 28 and 10% respectively, although the model did not differentiate well between pico and nano POM in this region. In the deep convection zone, spring phytoplankton biomass was high (1.34 mg.m−3) and dominated by micro/nano phytoplankton. Estimated average contributions to zooplankton biomass by pico, nano and micro POM were 42, 42 and 20% respectively, indicating that a large part of the microphytoplankton biomass may have remained ungrazed. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Hunt BPV, Carlotti F, Donoso K, Pagano M, D'Ortenzio F, Taillandier V, Conan P (2017) Trophic pathways of phytoplankton size classes through the zooplankton food-web over the spring transition period in the north-west Mediterranean Sea. J Geophys Res-Oceans | doi: 10.1002/2016JC012658
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