Influence of seasonality on the toxicity and metals bioavailability after the resuspension of sediments from a tropical estuary

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Monte, Christiane do Nascimento ; Rodrigues, Ana Paula de Castro ; de Campos, Bruno Galvao ; Moreira, Lucas Buruaem ; Grebbe, Beatriz ; Pauly, Guacira de Figueiredo Eufrasio ; Cruz, Ana Carolina Feitosa ; da Silva, Lilian Irene Dias ; Cordeiro, Renato Campello ; Abessa, Denis Moledo de Souza ; Machado, Wilson

• Document type: Journal article
• Source: ESTUARINE COASTAL AND SHELF SCIENCE; v. 315, p. 13-pg., 2025-02-06.

Abstract

The resuspension of polluted sediments often transfers contaminants to the water column, but the potential alterations in deposited bottom sediments remain overlooked. Guanabara Bay (GB) is a tropical estuary highly polluted by multiple sources and contaminants. This study aimed to assess possible changes of toxicity and metal pollutant retention capacity of GB sediments after resuspension, at 1h and 24h after resuspension. Sediments were collected from the Nitero<acute accent>i Harbor (NH), Meriti River (MR), Igua & ccedil;u River (IR), Rio de Janeiro Harbor (RJH), and Guapimirim Protection Area (Guapi) in winter and summer. Whole sediment toxicity on the fecundity of Nitokra sp. was lower in the Guapi, while IR and RJH were the most toxic. Effects on the sediment-water interface were assessed by embryo-larval development of Echinometra lucunter, with higher toxicity occurring in samples from MR and RJH after resuspension, showing that resuspension increases toxicity. Resuspension increased toxicity in the sediment and water, demonstrating the paramount importance of performing ecotoxicological characterization in different periods. Furthermore, proper management of dredged materials will benefit from predictions of toxicity changes related to seasonal variability. (AU)

• FAPESP's process: 18/23279-4 - Beyond conventional endpoints: evaluation of toxic effects in Danio rerio and Corbicula fluminea associated with water and sediments contaminated by the mining tailings released after the rupture of the Fundão Dam, at Rio Doce (ES - MG)
• Grantee: Guacira de Figueiredo Eufrasio Pauly
• Support Opportunities: Scholarships in Brazil - Doctorate
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• Grantee: Ana Carolina Feitosa Cruz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
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• Grantee: Lucas Buruaem Moreira
• Support Opportunities: BIOTA-FAPESP Program - Young Investigators Grants
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• Grantee: Denis Moledo de Souza Abessa
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants
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• Grantee: Ana Carolina Feitosa Cruz
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/10211-0 - Ecotoxicological study of the anti-fouling biocide Sea-Nine in neotropical marine invertebrates.
• Grantee: Bruno Galvão de Campos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/08471-9 - Whole transcriptome analysis of benthic organisms as models to estimate toxic effects of contaminated sediments in marine environments
• Grantee: Lucas Buruaem Moreira
• Support Opportunities: Scholarships in Brazil - BIOTA - Young Researchers