The effect of Zostera noltei recolonization on the sediment mercury vertical profiles of a recovering coastal lagoon

The effect of Zostera noltei recolonization on the sediment mercury vertical profiles of a recovering coastal lagoon

Mercury's extreme toxicity and persistence in the environment justifies a thorough evaluation of its dynamics in ecosystems. Aveiro Lagoon (Portugal) was for decades subject to mercury effluent discharges. A Nature-based Solution (NbS) involving Zostera noltei re-colonization is being tested as...

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Veröffentlicht in:Chemosphere (Oxford) 2023-12, Vol.345, p.140438-140438, Article 140438
Hauptverfasser: Oliveira, V.H., Fonte, B.A., Costa, F., Sousa, A.I., Henriques, B., Pereira, E., Dolbeth, M., Díez, S., Coelho, J.P.
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container_start_page 140438
container_title Chemosphere (Oxford)
container_volume 345
creator Oliveira, V.H.
Fonte, B.A.
Costa, F.
Sousa, A.I.
Henriques, B.
Pereira, E.
Dolbeth, M.
Díez, S.
Coelho, J.P.
description Mercury's extreme toxicity and persistence in the environment justifies a thorough evaluation of its dynamics in ecosystems. Aveiro Lagoon (Portugal) was for decades subject to mercury effluent discharges. A Nature-based Solution (NbS) involving Zostera noltei re-colonization is being tested as an active ecosystem restoration measure. To study the effect of Zostera noltei on the sediment contaminant biogeochemistry, seasonal (summer/winter) sediment, interstitial water and labile mercury vertical profiles were made in vegetated (Transplanted and Natural seagrass meadows) and non-vegetated sites (Bare-bottom area). While no significant differences (p > 0.05) were observed in the sedimentary phase, Zostera noltei presence reduced the reactive/labile mercury concentrations in the top sediment layers by up to 40% when compared to non-vegetated sediment, regardless of season. No differences were found between vegetated meadows, highlighting the fast recovery of the contaminant regulation ecosystem function provided by the plants after re-colonization and its potential for the rehabilitation of historically contaminated ecosystems.
doi_str_mv 10.1016/j.chemosphere.2023.140438
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title The effect of Zostera noltei recolonization on the sediment mercury vertical profiles of a recovering coastal lagoon
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