Effects of seasonal contaminant remobilization on the community trophic dynamics in a Brazilian tropical estuary.

Autor: Andrades R; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil. Electronic address: ryanandrades@gmail.com., Martins RF; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Guabiroba HC; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Rodrigues VLA; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Szablak FT; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Bastos KV; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Bastos PGP; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Lima LRS; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Vilar CC; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil., Joyeux JC; Laboratório de Ictiologia, Departamento de Oceanografia, Universidade Federal do Espírito Santo, Vitória, ES, Brazil.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Dec 20; Vol. 801, pp. 149670. Date of Electronic Publication: 2021 Aug 14.
DOI: 10.1016/j.scitotenv.2021.149670
Abstrakt: In tropical estuaries, wet seasons are responsible for the downstream transport of allochthonous material from the upper basin and flooded plains. Although allochthonous matter is commonly associated to nutrient and detritus input, pollutants are also transported throughout the basin or suspended from the river bottom via strong streamflow remobilization and rainfall dynamics. We assessed community and population trophic niche-based patterns using organisms' stable isotopes signatures in the wet and the dry seasons to test if estuarine trophic diversity is affected by remobilization of metal-contaminated material from a mining dam collapse that occurred in the Doce river basin, Brazil. Trophic depletion was detected community-wide and in a key consumer group (bottom-dwelling fishes) at the end of the wet season in the impacted Doce river estuary (DRE). Conversely, higher trophic diversity values were recorded in a well-preserved estuary used as control site. Stable isotopes mixing models indicated in the DRE that G. genidens, a predator fish species, presented poor-quality diet based on pollutant-tolerant tiny organisms, a finding that strongly contrasts from diet described in other, little-impacted Brazilian estuaries. Although wet seasons are expected to increase trophic, functional and taxonomic diversity in tropical estuaries, in the DRE the rainfall-driven dynamics poses a threat to the community due to the presence of ore tailings.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Currently some authors receive a fellowship or salary from the Espírito Santo Foundation for Technology (FEST: Fundação Espírito-Santense de Tecnologia; http://www.fest.org.br/fest2018/) for their participation in the Aquatic Biodiversity Monitoring Program (PMBA: Programa de Monitoramento da Biodiversidade Aquática) run by the Doce river-sea Network (RRDM: Rede Rio Doce Mar; http://rrdm.net.br/) as part of an agreement between FEST and the Renova Foundation. The Renova Foundation is the entity responsible for the mobilization of the reparation of the damages caused by the collapse of the Fundao dam in Mariana (MG). It is a non-profit organization, the result of a legal commitment called Transaction and Conduct Adjustment Term (TTAC). Statutes, in Portuguese, can be found at https://www.fundacaorenova.org/wp-content/uploads/2020/07/estatuto-registrado-2019.pdf). Neither the FEST or Renova Foundation played any role in designing the study, data acquisition, interpretation of the results or preparation of the manuscript.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: