Evidence of microplastic-mediated transfer of PCB-153 to sea urchin tissues using radiotracers

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Pyl, Marine | Taylor, Angus | Oberhänsli, François | Swarzenski, Peter | Besson, Marc | Danis, Bruno | Metian, Marc

Edité par CCSD ; Elsevier -

International audience. The present study reports the first experimental microplastic-mediated transfer of a key PCB congener into adult specimens of the sea urchin Paracentrotus lividus. Three experiments were conducted to assess whether ¹⁴C-PCB-153 adsorbed onto negatively buoyant MPs (500-600 µm) is bioavailable to the sea urchin : (1) exposure to a low concentration of ¹⁴C-PCB-153 sorbed onto a high number of virgin MPs ("lowPCB highMP" experiment), (2) exposure to a high concentration of ¹⁴C-PCB-153 sorbed onto a relatively low number of virgin MPs ("highPCB lowMP" experiment), and (3) exposure to a low concentration of ¹⁴C-PCB-153 sorbed onto a relatively low number of aged MP ("lowPCB lowMP" experiment). Results showed that the transfer of ¹⁴C-PCB-153 from MPs to sea urchin tissues occurred in each of the three 15-day experiments, suggesting that MPs located on the seafloor may act as vectors of PCB-153 to sea urchins even during short-term exposure events.

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