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Author: search.filters.author.Carlos A. ManzanoStart date: 2022

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    Atmospheric Dispersal and Local Drivers Shape Snow and Air Microbial Communities in the Western Antarctic Peninsula
    (Wiley, 2026-05)
    ALCAMAN ARIAS, MARIA ESTRELLA  
    ;
    Ignacio Ramos‐Tapia
    ;
    Francisco Fuentes
    ;
    Roberto Bastías
    ;
    Carlos A. Manzano
    <jats:title>ABSTRACT</jats:title> <jats:p>Microbial communities in Antarctica's snow and atmosphere are critical for nutrient cycling and are highly sensitive to environmental change. We characterised the bacterial composition, diversity, and co‐occurrence network structure of surface snow and airborne microbiomes from two contrasting bays along the Western Antarctic Peninsula (WAP): Arturo Prat Base (APB; Chile Bay, Greenwich Island) and Yelcho Base (YB; South Bay, Doumer Island), sampled during consecutive austral summers (2022–2023). Surface snow and air samples were analysed using 16S rRNA gene sequencing, diversity indices, and network analyses to evaluate spatial and interannual dynamics. Proteobacteria and Bacteroidota dominated both environments, but community structures differed between sites: APB showed stronger local and anthropogenic signals near logistic stations, whereas YB reflected more stable deposition regimes and distant atmospheric inputs. Airborne communities displayed limited interannual variation and high compositional similarity between sites, consistent with atmospheric seeding by polar air masses. Co‐occurrence networks revealed denser, more structured interactions within snow communities, with keystone taxa linking snow and air, sustaining deposition–resuspension dynamics. These findings highlight that long‐range atmospheric transport and local conditions shape Antarctic microbial dynamics, providing insights for forecasting microbiome responses and assessing airborne health risks amid human activity and climate change in polar regions.</jats:p>
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    Emission of polycyclic aromatic hydrocarbons in the north-west Antarctic Peninsula region
    (2024)
    María J. Valdivia
    ;
    Sebastián Sánchez
    ;
    Jennifer Saa
    ;
    Roberto Bastías
    ;
    Gastón Higuera
    Scopus© Citations 1  8
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    Blowin’ in the Wind: Mapping the Dispersion of Metal(loid)s From Atacama Mining
    (2024)
    Nicolás C. Zanetta‐Colombo
    ;
    Carlos A. Manzano
    ;
    Dagmar Brombierstäudl
    ;
    FLEMING, ZOE LOUISE  
    ;
    Eugenia M. Gayo
    <jats:title>Abstract</jats:title><jats:p>The Atacama Desert’s naturally elevated metal(loid)s pose a unique challenge for assessing the environmental impact of mining, particularly for indigenous communities residing in these areas. This study investigates how copper mining influences the dispersion of these elements in the wind‐transportable fraction (&lt;75 μm) of surface sediments across an 80 km radius. We employed a multi‐pronged approach, utilizing spatial modeling to map element distributions, exponential decay analysis to quantify concentration decline with distance, regime shift modeling to identify dispersion pattern variations, and pollution assessment to evaluate impact. Our results reveal significant mining‐driven increases in surface concentrations of copper (Cu), molybdenum (Mo), and arsenic (As). Notably, within the first 20 km, concentrations peaked at 1,016 mg kg⁻<jats:sup>1</jats:sup> for Cu, 31 mg kg⁻<jats:sup>1</jats:sup> for Mo, and a remarkable 165 mg kg⁻<jats:sup>1</jats:sup> for As. Cu and Mo displayed significant dispersion, extending up to 50 km from the source. However, As exhibited the most extensive reach, traveling up to 70 km downwind, highlighting the far‐reaching ecological footprint of mining operations. Mineralogical analyses corroborated these findings, identifying mining‐related minerals in surface sediments far beyond the immediate mining area. Although pollution indices based on the proposed Local Geochemical Background reveal significant contamination across the study area, establishing accurate pre‐industrial baseline values is essential for a more reliable assessment. This study challenges the concept of “natural pollution” by demonstrating that human activities exacerbate baseline metal(loid)s levels. Expanding monitoring protocols is imperative to comprehensively assess the combined effects of multiple emission sources, including mining and natural processes, in safeguarding environmental and human health for future generations.</jats:p>
    Scopus© Citations 1  2
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    When another one bites the dust: Environmental impact of global copper demand on local communities in the Atacama mining hotspot as registered by tree rings
    (2024)
    Nicolás C. Zanetta-Colombo
    ;
    Tobias Scharnweber
    ;
    Duncan A. Christie
    ;
    Carlos A. Manzano
    ;
    Mario Blersch
    Scopus© Citations 12  9
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    Impact of mining on the metal content of dust in indigenous villages of northern Chile
    (2022)
    Nicolás C. Zanetta-Colombo
    ;
    FLEMING, ZOE LOUISE  
    ;
    Eugenia M. Gayo
    ;
    Carlos A. Manzano
    ;
    Marios Panagi
    Scopus© Citations 38  3