Benthic bioturbation: A canary in the mine for the retention and release of metals from estuarine sediments

Diego Barcellos*, Sebastian S.K. Jensen, Angelo F. Bernardino, Fabrício A. Gabriel, Tiago O. Ferreira, Cintia O. Quintana

*Kontaktforfatter

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

After the largest mining tailings spill in Brazil, the Rio Doce estuarine ecosystem was severely impacted by metal contamination. In a 28-day laboratory experiment, we examined the effects of the polychaeta Laeonereis sp. on fluxes of oxygen and metal across the sediment-water interface. The density-dependent effect of Laeonereis sp. in the oxygen and metal fluxes was tested at low and high (74 and 222 ind m−2, respectively) densities, and compared with defaunated controls. The higher worm density had an amplified effect on the oxygen flux, sediment uptake of Al and Mn, and Fe oxidation compared with the control, but no significant effects on other metals (Ba, Cd, Co, Cr, Cu, Ni, and Zn). Higher worm density increased the oxidation of Fe phases, but no effect in the solid phase of other metals. Consequently, Laeonereis sp. bioturbation prevents the reduction of Fe phases and the release of metal-bound-contaminants to estuarine systems.

OriginalsprogEngelsk
Artikelnummer112912
TidsskriftMarine Pollution Bulletin
Vol/bind172
ISSN0025-326X
DOI
StatusUdgivet - nov. 2021

Bibliografisk note

Funding Information:
This work was financially supported by the Funda??o de Amparo a Pesquisa e Inova??o do Esp?rito Santo (FAPES, 77683544/17), Conselho Nacional de Pesquisa e Desenvolvimento (CNPq, 305996/2018-5) and Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) to AFB and TOF. The authors are also grateful for the financial support from the S?o Paulo Research Foundation (FAPESP, 2019/02855-0 to DB; 2019/19987-6 and 2018/08408-2 to TOF).

Funding Information:
This work was financially supported by the Fundação de Amparo a Pesquisa e Inovação do Espírito Santo ( FAPES , 77683544/17 ), Conselho Nacional de Pesquisa e Desenvolvimento ( CNPq , 305996/2018-5 ) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) to AFB and TOF. The authors are also grateful for the financial support from the São Paulo Research Foundation (FAPESP, 2019/02855-0 to DB; 2019/19987-6 and 2018/08408-2 to TOF).

Publisher Copyright:
© 2021 Elsevier Ltd

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