Lead toxicity on a sentinel species subpopulation inhabiting mangroves with different status conservation
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Lead is a priority pollutant introduced in the aquatic environment by different sources commonly located
in estuarine regions, such as ports, marinas and industries. Environmental agencies around the world set
the maximum allowable concentration of lead in effluents, surface water and sediment, but few studies
reported its accumulation and chronic toxicity in mangrove benthic invertebrates using concentrations
believed to be safe. In the case of Brazilian mangrove environments, Ucides cordatus is a crab species of
choice to be used in bioaccumulation studies. We have assessed biomarkers’ responses (DNA strand
breaks, micronucleated cells, metallothioneins, enzymatic activity of aminolevulinic acid dehydratase
and neutral red retention time) and the total bioaccumulation in six tissues of U. cordatus crabs resident
to mangrove areas under different conservation status during a 28-day period bioassay. We also
investigated Pb subcellular partition and biomarkers’ responses using a supposedly safe concentration
(10 mg L 1). During the Pb exposure, the highest concentration of Pb was observed in crab gills. Crabs also
showed a high ability to allocate Pb in detoxified forms. Multivariate analysis pointed out that bioaccumulation
(total, active and detoxified) is linked to biomarkers. Even in supposedly safe dosage, U.
cordatus triggered its defense mechanisms expressing more metallothioneins and presented relevant cyto-genotoxic damage. Our data suggest the development of biological tolerance to Pb in crabs from
polluted areas. Our results provided a new insight about lead toxicity even at concentrations considered
environmentally safe, which could support new strategies to manage estuarine areas considering their
respective conservation status.
Como referenciar
DUARTE, LUIS F. de A.; BLASCO, JULIAN; CATHARINO, MARILIA G.M.; MOREIRA, EDSON G.; TROMBINI, CHIARA; NOBRE, CAIO R.; MORENO, BEATRIZ B.; ABESSA, DENIS M. de S.; PEREIRA, CAMILO D.S. Lead toxicity on a sentinel species subpopulation inhabiting mangroves with different status conservation. Chemosphere, v. 251, p. 1-13, 2020. DOI: 10.1016/j.chemosphere.2020.126394. Disponível em: http://repositorio.ipen.br/handle/123456789/31357. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.