Severe environmental disturbances compromise ecological thresholds in aquatic environments

Large-scale disturbances can profoundly alter aquatic ecosystems by modifying water chemistry, sediment dynamics, and biodiversity across connected freshwater and marine environments. The 2015 Fundão Dam collapse in Brazil provides an unprecedented context to evaluate how multiple aquatic communities respond to intense and prolonged contamination, revealing key mechanisms of community reorganization under chronic anthropogenic impacts. By a multi-taxa monitoring dataset collected from 62 freshwater and marine sites, we analyzed how different communities, comprising phytoplankton, zooplankton, macroinvertebrates, and fish, responded along a gradient of mining tailing exposure. Applying threshold indicator taxa analysis (TITAN), we identified critical environmental variables, capturing tipping points for positive and negative biotic responses to tailing-related environmental gradients. Our results showed that mining-related contaminants, combined with hydrogeochemical alterations triggered by the dam collapse, have driven long-term changes in biodiversity, reshaping ecosystem functioning. The same stressors that caused widespread negative responses in community structure also promoted localized increases in opportunistic, mainly planktonic taxa, indicating a multidirectional community reorganization. In general, small increases in metals and hydrogeochemical alterations (such as turbidity up to 17 NTU in riverine systems and 2 NTU in the marine sites), resulting from the dam collapse have driven persistent changes in biodiversity, ultimately reshaping ecosystem functioning. Integrating community-level thresholds should represent a critical approach to improve the detection of regime shifts and to support the development of habitat-specific recovery strategies for riverine and marine ecosystems affected by mining disturbances.

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Publication Details

Journal
Environmental Monitoring and Assessment
Published
2026-10-26
DOI
https://doi.org/10.1007/s10661-026-16090-7
Primary Topic
Freshwater macroinvertebrate diversity and ecology
Type
article
Field-Weighted Citation Impact
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article

Severe environmental disturbances compromise ecological thresholds in aquatic environments

Eneida Maria Eskinazi-Sant’Anna, Gilberto Fonseca Barroso, Kyssyanne Samihra Santos Oliveira, Vânya Márcia Duarte Pasa et al.
1 links
Environmental Monitoring and Assessment
Freshwater macroinvertebrate diversity and ecology
article

Severe environmental disturbances compromise ecological thresholds in aquatic environments

Eneida Maria Eskinazi-Sant’Anna, Gilberto Fonseca Barroso, Kyssyanne Samihra Santos Oliveira, Vânya Márcia Duarte Pasa, Fábio Cavalca Bom, Fabian Sá, Nelson A. Gouveia, Luiz Loureiro Fernandes, Maikon Di Domênico, Fabiana Xavier Costa, Valéria da Silva Quaresma, Beatrice Padovani Ferreira, Daniel Rigo, Nadson Ressyé Simões, Maurício Hostim‐Silva, Gisele Daiane Pinha, Renato Rodrigues Neto, Stéfano Zorzal‐Almeida, Alessandra Delazari‐Barroso, Jorge Abdala Dergam, Alex Cardoso Bastos, Renato David Ghisolfi, Manuela S. Santana, Elisabeth Henschel, Leila de Lourdes Longo
article en

Abstract

Large-scale disturbances can profoundly alter aquatic ecosystems by modifying water chemistry, sediment dynamics, and biodiversity across connected freshwater and marine environments. The 2015 Fundão Dam collapse in Brazil provides an unprecedented context to evaluate how multiple aquatic communities respond to intense and prolonged contamination, revealing key mechanisms of community reorganization under chronic anthropogenic impacts. By a multi-taxa monitoring dataset collected from 62 freshwater and marine sites, we analyzed how different communities, comprising phytoplankton, zooplankton, macroinvertebrates, and fish, responded along a gradient of mining tailing exposure. Applying threshold indicator taxa analysis (TITAN), we identified critical environmental variables, capturing tipping points for positive and negative biotic responses to tailing-related environmental gradients. Our results showed that mining-related contaminants, combined with hydrogeochemical alterations triggered by the dam collapse, have driven long-term changes in biodiversity, reshaping ecosystem functioning. The same stressors that caused widespread negative responses in community structure also promoted localized increases in opportunistic, mainly planktonic taxa, indicating a multidirectional community reorganization. In general, small increases in metals and hydrogeochemical alterations (such as turbidity up to 17 NTU in riverine systems and 2 NTU in the marine sites), resulting from the dam collapse have driven persistent changes in biodiversity, ultimately reshaping ecosystem functioning. Integrating community-level thresholds should represent a critical approach to improve the detection of regime shifts and to support the development of habitat-specific recovery strategies for riverine and marine ecosystems affected by mining disturbances.

Environmental Monitoring and AssessmentVol. 198(11)
Universidade Federal de Ouro Preto (BR), Universidade Federal de Minas Gerais (BR), Universidade Federal do Recôncavo da Bahia (BR), Universidade Federal de Viçosa (BR), Pontifícia Universidade Católica do Paraná (BR), University of Victoria (CA), Universidade Federal de Pernambuco (BR), Universidade Federal do Sul da Bahia (BR), Faculdades Integradas de São Paulo (BR), Universidade Federal do Espírito Santo (BR), Universidade Federal do Paraná (BR)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Clean water and sanitation, Life on land
Openalex Percentile: Top 17%
Freshwater macroinvertebrate diversity and ecology
DOIOpen Access PDFOpenAlex
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