The role of bioturbation by Ucides cordatus crab in the fractionation and bioavailability of trace metals in tropical semiarid mangroves

Autor(es)

de Carvalho Araujo Junior, Jose Moacir ; Ferreira, Tiago Osorio ; Suarez-Abelenda, Manuel ; Nobrega, Gabriel Nuto ; Brito Marques Albuquerque, Antonia Gislaine ; Bezerra, Alessandra de Carvalho ; Otero, Xose L.

• Tipo de documento: Artigo Científico
• Fonte: Marine Pollution Bulletin; v. 111, n. 1-2, p. 194-202, OCT 15 2016.
• Citações Web of Science: 7

Resumo

This study evaluated the burrowing activity of U. cordatus and its effects on Fe, Cu and Zn fractionation, bioavailability and bioaccumulation in a semiarid mangrove area (Ceara state, NE-Brazil). Were analyzed the Eh; pH; grain size and pore water composition; total S and organic C, and the speciation of Fe, Cu and Zn solid-phases in two areas: a densely populated crab and a control site. The burrowing activity and seasonal variation affect the biogeochemical conditions of mangrove soils increasing metals bioavailability and bioaccumulation. The crab burrows favors the entrance of oxygen into the soil, oxidizing the pyrite and forming poorly-crystalline Fe minerals, increasing the risks of biocontamination. Furthermore, the metals content in the hepatopancreas are a good proxy for the evaluation of bioavailable metal forms and, thus, further studies must be conducted in order to evaluate the potential use of U. cordatus as a bioindicator for trace metals contamination. (C) 2016 Published by Elsevier Ltd. (AU)

• Processo FAPESP: 14/11778-5 - Solos subaquáticos de pradarias marinhas (seagrass bed) do Brasil: biogeoquímica, gênese e classificação
• Beneficiário: Gabriel Nuto Nóbrega
• Modalidade de apoio: Bolsas no Brasil - Doutorado