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Poster De Conférence Année : 2022

Accumulation and chronic effects of cobalt on the gastropod Radix balthica

Amiel Boullemant
  • Fonction : Auteur

Résumé

Gastropods are widespread mollusk living at the bottom and in shallow water of freshwater systems. First consumers of periphyton and plants, they represent an important source of food for large crustacean and fish. Toxic effects due to contamination such as metal increase would thus impede food sustainability of ecosystems. Gastropod shell has the interesting feature to grow throughout their life by integrating some of the chemical elements present in their environment, including metals. Moreover, direct correlations have been observed between the metal concentrations in the soft bodies of mollusks and those present in their ambient environment. The present study aims to examine the relationships between the metal concentrations in the environment, in the soft tissue and in the shell. Here, cobalt (Co) is the metal of interest due to its increasing use in recent technologies of transport or energy production. Co effects towards gastropod growth and reproduction are also examined. To that end, the gastropod Radix balthica was exposed to increasing Co concentrations (6, 30 and 60 μg.L-1 Co) during 28 days using outdoor mesocosms (PERL, TotalEnergies) filled with the Gave de Pau water. Water and organisms were collected after 7, 14, 21, 28 days of exposure. The physicochemical parameters (pH, conductivity, oxygen and turbidity) were also monitored. Water was analysed for anion, cation and dissolved organic matter concentrations. Gastropod shell measurements (length and width) were done at each sampling time whereas the number of egg masses was additionally monitored. Total metal concentrations were analyzed in the whole shells and soft bodies using acidic digestions. Finally, microchemical analyses of metals in the shells are performed using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS and LA-ICP-MS). At day 28, the mortality (13, 19, 22 and 27 %) and the number of egg masses (21, 30, 44 and 56) increased respectively with the control and concentrations (6, 30 and 60 μg.L-1 Co). But the number of neonates was higher in the control (193) than in different concentrations (113, 10 and 58 respectively for 6, 30 and 60 μg.L-1 Co). Finally, accumulation of cobalt in the range of 1.24 ± 0.27 μg.g-1 was observed in the shell for the concentration 60 μg.L-1 Co . Those results will allow us to determine if gastropod shell can be a good bioindicator of metal in freshwater.

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Dates et versions

hal-03960403 , version 1 (27-01-2023)

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  • HAL Id : hal-03960403 , version 1

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Maëva Marimoutou, Gilles Bareille, Mathieu Milhe-Poutingon, Patrick Baldoni-Andrey, Amiel Boullemant, et al.. Accumulation and chronic effects of cobalt on the gastropod Radix balthica. SETAC Europe 32nd annual meeting, May 2022, Copenhague, Denmark. ⟨hal-03960403⟩
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