Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach
International audience Abstract. Modelling the development of soils in glacier forefields is necessary in order to assess how microbial and geochemical processes interact and shape soil development in response to glacier retreat. Furthermore, such models can help us predict microbial growth and the...
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ftinsu:oai:HAL:hal-04450527v1 2024-06-23T07:49:59+00:00 Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach Bradley, James Arndt, Sandra Šabacká, Marie Benning, Liane Barker, Gary Blacker, Joshua Yallop, Marian Wright, Katherine Bellas, Christopher Telling, Jonathan Tranter, Martyn Anesio, Alexandre Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Mediterranean Institute of Oceanography Marseille, France Aix Marseille Université (AMU) Queen Mary University of London (QMUL) 2016-10-13 https://hal.science/hal-04450527 https://hal.science/hal-04450527/document https://hal.science/hal-04450527/file/bg-13-5677-2016.pdf https://doi.org/10.5194/bg-13-5677-2016 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-13-5677-2016 hal-04450527 https://hal.science/hal-04450527 https://hal.science/hal-04450527/document https://hal.science/hal-04450527/file/bg-13-5677-2016.pdf doi:10.5194/bg-13-5677-2016 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-04450527 Biogeosciences, 2016, 13 (19), pp.5677-5696. ⟨10.5194/bg-13-5677-2016⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.5194/bg-13-5677-2016 2024-06-12T23:55:27Z International audience Abstract. Modelling the development of soils in glacier forefields is necessary in order to assess how microbial and geochemical processes interact and shape soil development in response to glacier retreat. Furthermore, such models can help us predict microbial growth and the fate of Arctic soils in an increasingly ice-free future. Here, for the first time, we combined field sampling with laboratory analyses and numerical modelling to investigate microbial community dynamics in oligotrophic proglacial soils in Svalbard. We measured low bacterial growth rates and growth efficiencies (relative to estimates from Alpine glacier forefields) and high sensitivity of bacterial growth rates to soil temperature (relative to temperate soils). We used these laboratory measurements to inform parameter values in a new numerical model and significantly refined predictions of microbial and biogeochemical dynamics of soil development over a period of roughly 120 years. The model predicted the observed accumulation of autotrophic and heterotrophic biomass. Genomic data indicated that initial microbial communities were dominated by bacteria derived from the glacial environment, whereas older soils hosted a mixed community of autotrophic and heterotrophic bacteria. This finding was simulated by the numerical model, which showed that active microbial communities play key roles in fixing and recycling carbon and nutrients. We also demonstrated the role of allochthonous carbon and microbial necromass in sustaining a pool of organic material, despite high heterotrophic activity in older soils. This combined field, laboratory, and modelling approach demonstrates the value of integrated model–data studies to understand and quantify the functioning of the microbial community in an emerging High Arctic soil ecosystem. Article in Journal/Newspaper Arctic glacier Svalbard Institut national des sciences de l'Univers: HAL-INSU Arctic Svalbard Biogeosciences 13 19 5677 5696 |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Bradley, James Arndt, Sandra Šabacká, Marie Benning, Liane Barker, Gary Blacker, Joshua Yallop, Marian Wright, Katherine Bellas, Christopher Telling, Jonathan Tranter, Martyn Anesio, Alexandre Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract. Modelling the development of soils in glacier forefields is necessary in order to assess how microbial and geochemical processes interact and shape soil development in response to glacier retreat. Furthermore, such models can help us predict microbial growth and the fate of Arctic soils in an increasingly ice-free future. Here, for the first time, we combined field sampling with laboratory analyses and numerical modelling to investigate microbial community dynamics in oligotrophic proglacial soils in Svalbard. We measured low bacterial growth rates and growth efficiencies (relative to estimates from Alpine glacier forefields) and high sensitivity of bacterial growth rates to soil temperature (relative to temperate soils). We used these laboratory measurements to inform parameter values in a new numerical model and significantly refined predictions of microbial and biogeochemical dynamics of soil development over a period of roughly 120 years. The model predicted the observed accumulation of autotrophic and heterotrophic biomass. Genomic data indicated that initial microbial communities were dominated by bacteria derived from the glacial environment, whereas older soils hosted a mixed community of autotrophic and heterotrophic bacteria. This finding was simulated by the numerical model, which showed that active microbial communities play key roles in fixing and recycling carbon and nutrients. We also demonstrated the role of allochthonous carbon and microbial necromass in sustaining a pool of organic material, despite high heterotrophic activity in older soils. This combined field, laboratory, and modelling approach demonstrates the value of integrated model–data studies to understand and quantify the functioning of the microbial community in an emerging High Arctic soil ecosystem. |
author2 |
Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Mediterranean Institute of Oceanography Marseille, France Aix Marseille Université (AMU) Queen Mary University of London (QMUL) |
format |
Article in Journal/Newspaper |
author |
Bradley, James Arndt, Sandra Šabacká, Marie Benning, Liane Barker, Gary Blacker, Joshua Yallop, Marian Wright, Katherine Bellas, Christopher Telling, Jonathan Tranter, Martyn Anesio, Alexandre |
author_facet |
Bradley, James Arndt, Sandra Šabacká, Marie Benning, Liane Barker, Gary Blacker, Joshua Yallop, Marian Wright, Katherine Bellas, Christopher Telling, Jonathan Tranter, Martyn Anesio, Alexandre |
author_sort |
Bradley, James |
title |
Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
title_short |
Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
title_full |
Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
title_fullStr |
Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
title_full_unstemmed |
Microbial dynamics in a High Arctic glacier forefield: a combined field, laboratory, and modelling approach |
title_sort |
microbial dynamics in a high arctic glacier forefield: a combined field, laboratory, and modelling approach |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-04450527 https://hal.science/hal-04450527/document https://hal.science/hal-04450527/file/bg-13-5677-2016.pdf https://doi.org/10.5194/bg-13-5677-2016 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic glacier Svalbard |
genre_facet |
Arctic glacier Svalbard |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.science/hal-04450527 Biogeosciences, 2016, 13 (19), pp.5677-5696. ⟨10.5194/bg-13-5677-2016⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-13-5677-2016 hal-04450527 https://hal.science/hal-04450527 https://hal.science/hal-04450527/document https://hal.science/hal-04450527/file/bg-13-5677-2016.pdf doi:10.5194/bg-13-5677-2016 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-13-5677-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
19 |
container_start_page |
5677 |
op_container_end_page |
5696 |
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1802640719977906176 |