Impact assessment of ephemeral discharge of contamination downstream of two legacy base metal mines using environmental DNA

Kavehei, Armin; Gore, Damian B.; Chariton, Anthony A.; Hose, Grant C.

doi:10.1016/j.jhazmat.2021.126483

Cited by 10 publications

(1 citation statement)

References 68 publications

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“…Geothrix, particularly G. fermentas is known to be present in petroleum-contaminated sediments, freshwaters, and even aquifers [66]. They have specifically been recognised for the role they play in purifying petroleum-contaminated environments and metal recycling within the environment [67]. Likewise, Ideonella is known to be a degrader of plastics.…”

Section: Discussionmentioning

confidence: 99%

Microbiome Diversity Analysis of the Bacterial Community in Idah River, Kogi State, Nigeria

Adedire¹,

Jimoh²,

Kashim-Bello³

et al. 2022

AiM

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The analysis of bacterial diversity in aquatic systems particularly in rivers, lakes, and streams can provide useful data on the effect of anthropogenic activities on such water bodies to humans and fishes. Idah River, the focal point of this study, is an offshoot of the two major Nigerian rivers characterized by observed human activities and pollution sources. Water samples were collected from four designated sites and assessed for their bacterial assemblages and structure, using PacBio Single-Molecule Real-Time (SMRT) sequencing technology. The full length of the 16S rRNA gene was sequenced, and Amplicon Sequence Variants were generated using the DADA2 workflow optimised for PacBio long-read amplicons in Rstudio. A total of 8751 high-quality reads obtained were taxonomically classified as 24 phyla, 42 classes, 84 orders, 125 families, 156 genera, and 106 species. Taxonomical composition revealed Proteobacteria as the most abundant phyla across all sample sites. At the genera level, Azospira (57.03%) was the most dominant ASV in Docking Point A, while Acinetobacter (66.67%) was the most abundant ASV in Docking Point B. In Idah Axis Confluence, hgcl clade (65.66%) was the most prevalent ASV, whereas Holophaga (42.86%) was the most common ASV in Idah Axis Midstream. Genera analysis also revealed that 12.9% of the total ASVs were discovered across all sample sites. Among these were pathogenic bacteria, reducers, and degraders of domestic and animal wastes. Observed results provide evidence that sampled sites of Idah River are contaminated, most likely through constant human activities and thus, could have an impact on resident fishes as well. This study, therefore, agrees with a previous report from the river, which used standard microbial procedures. However, next-generation se-

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Section: Discussionmentioning

confidence: 99%

Microbiome Diversity Analysis of the Bacterial Community in Idah River, Kogi State, Nigeria

Adedire¹,

Jimoh²,

Kashim-Bello³

et al. 2022

AiM

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The Origin of the Matter Matters: The Influence of Terrestrial Inputs on Coastal Benthic Microeukaryote Communities Revealed by eDNA

Meyneng,

Siano,

Mouras

et al. 2024

Environmental DNA

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Estuaries are a key component of the land‐sea continuum, and their microbial diversity depends on the connection with terrestrial ecosystems. This work aimed to demonstrate that the terrestrial matter carried by rivers influences the structuration of microeukaryote communities of superficial (0–3 cm) sediments collected at the interface between the land and marine coastal areas. To demonstrate this hypothesis, we have chosen the main island of New Caledonia as a study site, a French overseas territory located in the South West Pacific. Using amplicon sequencing of the 18S‐V4 rDNA extracted from sediments, we analyzed microeukaryote community composition in relation to numerous environmental parameters. Samples were collected in five bays influenced by riverine inputs and corresponding to distinct geological features of the watersheds, as revealed by high variations in metal concentrations released from specific minerals in the sediment. Particularly, the influence of ultramafic soils was highlighted by higher nickel concentration (correlated to Co, Cr, Mn, and Fe). Diatoms were the dominant taxonomic group, especially the classes of Bacillariophyceae and Mediophyceae. Then Apicomplexa, Ciliophora, Dinoflagellata, and Cercozoa followed. The metallic composition of the sediment explained 18.46% of the community spatial variability. The selection of ASVs based on their contribution to beta diversity and their correlation with metallic concentrations enabled us to identify spatial patterns. This information could lead to identifying microeukaryote bioindicators of terrestrial influences, particularly of ultramafic origin. We hypothesized that the association between microeukaryotes and metallic compositions is linked to selection processes, given the resistance of some microeukaryotes to some high metallic concentrations. In vitro experiments are needed to confirm this hypothesis. Our results emphasized the role of terrestrial inputs in shaping estuarine diversity and the need to consider the entire land–sea continuum for studying these ecosystems.

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Characterizing the spatial distributions of soil biota at a legacy base metal mine using environmental DNA

et al. 2022

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Impact assessment of ephemeral discharge of contamination downstream of two legacy base metal mines using environmental DNA

Cited by 10 publications

References 68 publications

Microbiome Diversity Analysis of the Bacterial Community in Idah River, Kogi State, Nigeria

Microbiome Diversity Analysis of the Bacterial Community in Idah River, Kogi State, Nigeria

The Origin of the Matter Matters: The Influence of Terrestrial Inputs on Coastal Benthic Microeukaryote Communities Revealed by eDNA

Characterizing the spatial distributions of soil biota at a legacy base metal mine using environmental DNA

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