Chronic trace metals effects of mine tailings on estuarine assemblages revealed by environmental DNA
| Autor: | Fabricio A. Gabriel, Angelo F. Bernardino, Tiago Osório Ferreira, Louisi S Oliveira, Hermano M. Queiroz, Fabiano Sviatopolk-Mirsky Pais, Ana Carolina de Azevedo Mazzuco |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Environmental Impacts
Meiofauna Biodiversity lcsh:Medicine Environmental pollution 010501 environmental sciences 01 natural sciences General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Benthos Samarco Trace metal Environmental DNA REJEITOS DE MINERAÇÃO 030304 developmental biology 0105 earth and related environmental sciences 0303 health sciences geography geography.geographical_feature_category Doce Ecology General Neuroscience Aquatic ecosystem Biological Oceanography Estuary lcsh:R General Medicine Rio Tailings Pollution Benthic zone Impacts Environmental science General Agricultural and Biological Sciences |
| Zdroj: | PeerJ, Vol 7, p e8042 (2019) Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP PeerJ |
| DOI: | 10.7287/peerj.preprints.27924 |
| Popis: | Mine tailing disasters have occurred worldwide and contemporary release of tailings of large proportions raise concerns of the chronic impacts that trace metals may have on the aquatic biodiversity. Environmental metabarcoding (eDNA) offers an as yet poorly explored opportunity for biological monitoring of impacted aquatic ecosystems from mine tailings and contaminated sediments. eDNA has been increasingly recognized to be an effective method to detect previously unrecognized small-sized Metazoan taxa, but their ecological responses to environmental pollution has not been assessed by metabarcoding. Here, we evaluated chronic effects of trace metal contamination from sediment eDNA of the Rio Doce estuary, 1.7 years after the Samarco mine tailing disaster, which released over 40 million m3 of iron tailings in the Rio Doce river basin. We identified 123 new sequence variants environmental taxonomic units (eOTUs) of benthic taxa and an assemblage composition dominated by Nematoda, Crustacea and Platyhelminthes; typical of other estuarine ecosystems. We detected environmental filtering on the meiofaunal assemblages and multivariate analysis revealed strong influence of Fe contamination, supporting chronic impacts from mine tailing deposition in the estuary. This was in contrast to environmental filtering of meiofaunal assemblages of non-polluted estuaries. Here, we suggest that the eDNA metabarcoding technique provides an opportunity to fill up biodiversity gaps in coastal marine ecology and may become a valid method for long term monitoring studies in mine tailing disasters and estuarine ecosystems with high trace metals content. |
| Databáze: | OpenAIRE |
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