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From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea

Nathan Nault Orcid Logo, Frédéric Gazeau Orcid Logo, Philippe Catala Orcid Logo, Barbara Marie Orcid Logo, Joan Llort Orcid Logo, Cécile Guieu Orcid Logo, Matthieu Bressac Orcid Logo, Emmanuelle Uher Orcid Logo, Maryline Montanes Orcid Logo, Elvira Pulido‐Villena Orcid Logo, Cristina Santin Nuno, Kahina Djaoudi Orcid Logo, Pierre E. Galand Orcid Logo, Eva Ortega‐Retuerta Orcid Logo

Environmental Microbiology, Volume: 28, Issue: 4, Start page: e70267

Swansea University Author: Cristina Santin Nuno

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DOI (Published version): 10.1111/1462-2920.70267

Abstract

The Mediterranean basin faces enhanced wildfire risks associated with human‐driven climate and land use changes. Wildfire‐generated aerosols can reach the ocean, where they may subsequently impact marine prokaryotic communities, key drivers of global biogeochemical cycles. However, our understanding...

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Published in: Environmental Microbiology
ISSN: 1462-2912
Published: John Wiley & Sons, Inc. 2026
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa71697
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spelling 2026-04-01T11:01:24.0395772 v2 71697 2026-04-01 From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea 993c82cbaf875c1268156360e83c4dfd Cristina Santin Nuno Cristina Santin Nuno true false 2026-04-01 BGPS The Mediterranean basin faces enhanced wildfire risks associated with human‐driven climate and land use changes. Wildfire‐generated aerosols can reach the ocean, where they may subsequently impact marine prokaryotic communities, key drivers of global biogeochemical cycles. However, our understanding of the influence of wildfire airborne particles on the abundance and composition of marine microbes remains limited. We conducted experiments in which surface water from the northwestern Mediterranean Sea was incubated in 300 L minicosms amended with varying amounts of wildfire fine ash particles, previously collected during a Mediterranean wildfire. Wet deposition of wildfire fine ash particles had a short‐term effect on prokaryotes by increasing their abundance and diversity, likely due to the release of both inorganic and organic substrates, alleviating nutrient limitations. Ash deposition could also indirectly affect prokaryotic communities via changes in the composition of phytoplankton populations. These mechanisms induced changes in prokaryotic community composition, reflecting a succession of taxa likely adapted to different substrate qualities. Ash had a negative effect on Cyanobiaceae but promoted the growth of Flavobacteriaceae, Rhodobacteraceae and SAR11 clade I among other taxa. Our findings demonstrate that wildfire ash can alter Mediterranean prokaryotic communities during oligotrophic periods, further exacerbating the impact of wildfires on marine ecosystems. Journal Article Environmental Microbiology 28 4 e70267 John Wiley & Sons, Inc. 1462-2912 experimental incubations; Mediterranean Sea; prokaryotic abundance; prokaryotic communities; wildfire ash 1 4 2026 2026-04-01 10.1111/1462-2920.70267 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Other Institut national des sciences de l’Univers; European Space Agency; Agence Nationale de la Recherche. Grant Numbers: ANR-10-INBS-0, ANR-21-ESRE-0038; Spanish ‘Ramon y Cajal’ Programme. Grant Number: RYC2018-025797-I 2026-04-01T11:01:24.0395772 2026-04-01T10:50:21.0947217 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Nathan Nault 0009-0000-5072-7652 1 Frédéric Gazeau 0000-0001-8807-4597 2 Philippe Catala 0009-0006-8262-5275 3 Barbara Marie 0000-0003-0005-6365 4 Joan Llort 0000-0003-1490-4521 5 Cécile Guieu 0000-0001-6373-8326 6 Matthieu Bressac 0000-0003-3075-3137 7 Emmanuelle Uher 0000-0002-3379-0040 8 Maryline Montanes 0000-0002-8796-849X 9 Elvira Pulido‐Villena 0000-0002-5436-2133 10 Cristina Santin Nuno 11 Kahina Djaoudi 0000-0002-7819-7304 12 Pierre E. Galand 0000-0002-2238-3247 13 Eva Ortega‐Retuerta 0000-0003-0780-8347 14 71697__36466__815fe74c113c423bb1167d63be44dfd9.pdf 71697.VoR.pdf 2026-04-01T10:59:04.6602804 Output 2090649 application/pdf Version of Record true © 2026 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License. true eng http://creativecommons.org/licenses/by/4.0/
title From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
spellingShingle From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
Cristina Santin Nuno
title_short From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
title_full From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
title_fullStr From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
title_full_unstemmed From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
title_sort From Flames to the Ocean: Biomass Burning Aerosols Are Associated With Changes in Prokaryotic Communities in the Mediterranean Sea
author_id_str_mv 993c82cbaf875c1268156360e83c4dfd
author_id_fullname_str_mv 993c82cbaf875c1268156360e83c4dfd_***_Cristina Santin Nuno
author Cristina Santin Nuno
author2 Nathan Nault
Frédéric Gazeau
Philippe Catala
Barbara Marie
Joan Llort
Cécile Guieu
Matthieu Bressac
Emmanuelle Uher
Maryline Montanes
Elvira Pulido‐Villena
Cristina Santin Nuno
Kahina Djaoudi
Pierre E. Galand
Eva Ortega‐Retuerta
format Journal article
container_title Environmental Microbiology
container_volume 28
container_issue 4
container_start_page e70267
publishDate 2026
institution Swansea University
issn 1462-2912
doi_str_mv 10.1111/1462-2920.70267
publisher John Wiley & Sons, Inc.
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description The Mediterranean basin faces enhanced wildfire risks associated with human‐driven climate and land use changes. Wildfire‐generated aerosols can reach the ocean, where they may subsequently impact marine prokaryotic communities, key drivers of global biogeochemical cycles. However, our understanding of the influence of wildfire airborne particles on the abundance and composition of marine microbes remains limited. We conducted experiments in which surface water from the northwestern Mediterranean Sea was incubated in 300 L minicosms amended with varying amounts of wildfire fine ash particles, previously collected during a Mediterranean wildfire. Wet deposition of wildfire fine ash particles had a short‐term effect on prokaryotes by increasing their abundance and diversity, likely due to the release of both inorganic and organic substrates, alleviating nutrient limitations. Ash deposition could also indirectly affect prokaryotic communities via changes in the composition of phytoplankton populations. These mechanisms induced changes in prokaryotic community composition, reflecting a succession of taxa likely adapted to different substrate qualities. Ash had a negative effect on Cyanobiaceae but promoted the growth of Flavobacteriaceae, Rhodobacteraceae and SAR11 clade I among other taxa. Our findings demonstrate that wildfire ash can alter Mediterranean prokaryotic communities during oligotrophic periods, further exacerbating the impact of wildfires on marine ecosystems.
published_date 2026-04-01T07:01:28Z
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score 11.1007185

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