210Po and 210Pb trophic transfer within the phytoplankton–zooplankton–anchovy/sardine food web: a case study from the Gulf of Lion (NW Mediterranean Sea)

Type Article
Date 2015-05
Language English
Author(s) Strady Emilie1, 2, Harmelin-Vivien Mireille3, Chiffoleau Jean-Francois4, Veron Alain1, Tronczynski Jacek4, Radakovitch Olivier1
Affiliation(s) 1 : Aix Marseille Univ, CEREGE UM34, CNRS, UMR7330, F-13545 Aix En Provence, France.
2 : IRD, LTHE, F-38000 Grenoble, France.
3 : Univ Toulon & Var, Aix Marseille Univ, CNRS INSU IRD, Inst Mediterraneen Oceanol MIO,UM 110, F-13288 Marseille, France.
4 : IFREMER Nantes, Nantes, France.
Source Journal Of Environmental Radioactivity (0265-931X) (Elsevier Sci Ltd), 2015-05 , Vol. 143 , P. 141-151
DOI 10.1016/j.jenvrad.2015.02.019
WOS© Times Cited 9
Keyword(s) Po-210, Pb-210, Phytoplankton, Zooplankton, Pelagic fishes, Mediterranean Sea
Abstract The transfer of 210Po and 210Pb in the food web of small pelagic fishes (from phytoplankton and zooplankton to anchovy Engraulis encrasicolus and sardine Sardina pilchardus) is investigated in the Gulf of Lion (GoL). We present original data of 210Po and 210Pb activity concentrations, C and N stable isotope ratios, measured (i) from different size classes of phytoplankton and zooplankton during spring and winter in different environments of the GoL, and (ii) in two fish species. Significant spatial patterns based on 210Po, 210Pb activity concentrations and 210Po/210Pb ratios in the different plankton size classes are evidenced by hierarchical clustering, both in spring and winter. This variability, also observed for C and N stable isotopes ratios, is connected to local specific pelagic habitats and hydrodynamics. The sampling strategy suggests that 210Po bioaccumulation in the GoL remains at a constant level from the first (dominated by phytoplankton) to the second trophic level (zooplankton), while 210Pb bioaccumulation shows an increase in winter. Based on stable N isotope ratios and 210Po activity concentrations measured in anchovies and sardines, we evidence 210Po bio-magnification along the trophic food web of these two planktivorous pelagic fishes.
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Strady Emilie, Harmelin-Vivien Mireille, Chiffoleau Jean-Francois, Veron Alain, Tronczynski Jacek, Radakovitch Olivier (2015). 210Po and 210Pb trophic transfer within the phytoplankton–zooplankton–anchovy/sardine food web: a case study from the Gulf of Lion (NW Mediterranean Sea). Journal Of Environmental Radioactivity, 143, 141-151. Publisher's official version : https://doi.org/10.1016/j.jenvrad.2015.02.019 , Open Access version : https://archimer.ifremer.fr/doc/00255/36609/