Dispersal of bacteria and stimulation of permafrost decomposition by Collembola
Contrary to most soils, permafrost soils have the atypical feature of being almost entirely deprived of soil fauna. Abiotic constraints on the fate of permafrost carbon after thawing are increasingly understood, but biotic constraints remain scarcely investigated. Incubation studies, essential to es...
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ftcopernicus:oai:publications.copernicus.org:bg102581 2023-05-15T15:12:04+02:00 Dispersal of bacteria and stimulation of permafrost decomposition by Collembola Monteux, Sylvain Mariën, Janine Krab, Eveline J. 2022-09-05 application/pdf https://doi.org/10.5194/bg-19-4089-2022 https://bg.copernicus.org/articles/19/4089/2022/ eng eng doi:10.5194/bg-19-4089-2022 https://bg.copernicus.org/articles/19/4089/2022/ eISSN: 1726-4189 Text 2022 ftcopernicus https://doi.org/10.5194/bg-19-4089-2022 2022-09-12T16:22:55Z Contrary to most soils, permafrost soils have the atypical feature of being almost entirely deprived of soil fauna. Abiotic constraints on the fate of permafrost carbon after thawing are increasingly understood, but biotic constraints remain scarcely investigated. Incubation studies, essential to estimate effects of permafrost thaw on carbon cycling, typically measure the consequences of permafrost thaw in isolation from the topsoil and thus do not account for the effects of altered biotic interactions because of e.g. colonization by soil fauna. Microarthropods facilitate the dispersal of microorganisms in soil, both on their cuticle (ectozoochory) and through their digestive tract (endozoochory), which may be particularly important in permafrost soils, considering that microbial community composition can strongly constrain permafrost biogeochemical processes. Here we tested how a model species of microarthropod (the Collembola Folsomia candida ) affected aerobic CO 2 production of permafrost soil over a 25 d incubation. By using Collembola stock cultures grown on permafrost soil or on an arctic topsoil, we aimed to assess the potential for endo- and ectozoochory of soil bacteria, while cultures grown on gypsum and sprayed with soil suspensions would allow the observation of only ectozoochory. The presence of Collembola introduced bacterial amplicon sequence variants (ASVs) absent in the no-Collembola control, regardless of their microbiome manipulation, when considering presence–absence metrics (unweighted UniFrac metrics), which resulted in increased species richness. However, these introduced ASVs did not induce changes in bacterial community composition as a whole (accounting for relative abundances, weighted UniFrac), which might only become detectable in the longer term. CO 2 production was increased by 25.85 % in the presence of Collembola, about half of which could be attributed to Collembola respiration based on respiration rates measured in the absence of soil. We argue that the rest of the CO 2 being ... Text Arctic permafrost Copernicus Publications: E-Journals Arctic Biogeosciences 19 17 4089 4105 |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Contrary to most soils, permafrost soils have the atypical feature of being almost entirely deprived of soil fauna. Abiotic constraints on the fate of permafrost carbon after thawing are increasingly understood, but biotic constraints remain scarcely investigated. Incubation studies, essential to estimate effects of permafrost thaw on carbon cycling, typically measure the consequences of permafrost thaw in isolation from the topsoil and thus do not account for the effects of altered biotic interactions because of e.g. colonization by soil fauna. Microarthropods facilitate the dispersal of microorganisms in soil, both on their cuticle (ectozoochory) and through their digestive tract (endozoochory), which may be particularly important in permafrost soils, considering that microbial community composition can strongly constrain permafrost biogeochemical processes. Here we tested how a model species of microarthropod (the Collembola Folsomia candida ) affected aerobic CO 2 production of permafrost soil over a 25 d incubation. By using Collembola stock cultures grown on permafrost soil or on an arctic topsoil, we aimed to assess the potential for endo- and ectozoochory of soil bacteria, while cultures grown on gypsum and sprayed with soil suspensions would allow the observation of only ectozoochory. The presence of Collembola introduced bacterial amplicon sequence variants (ASVs) absent in the no-Collembola control, regardless of their microbiome manipulation, when considering presence–absence metrics (unweighted UniFrac metrics), which resulted in increased species richness. However, these introduced ASVs did not induce changes in bacterial community composition as a whole (accounting for relative abundances, weighted UniFrac), which might only become detectable in the longer term. CO 2 production was increased by 25.85 % in the presence of Collembola, about half of which could be attributed to Collembola respiration based on respiration rates measured in the absence of soil. We argue that the rest of the CO 2 being ... |
format |
Text |
author |
Monteux, Sylvain Mariën, Janine Krab, Eveline J. |
spellingShingle |
Monteux, Sylvain Mariën, Janine Krab, Eveline J. Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
author_facet |
Monteux, Sylvain Mariën, Janine Krab, Eveline J. |
author_sort |
Monteux, Sylvain |
title |
Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
title_short |
Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
title_full |
Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
title_fullStr |
Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
title_full_unstemmed |
Dispersal of bacteria and stimulation of permafrost decomposition by Collembola |
title_sort |
dispersal of bacteria and stimulation of permafrost decomposition by collembola |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-4089-2022 https://bg.copernicus.org/articles/19/4089/2022/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-19-4089-2022 https://bg.copernicus.org/articles/19/4089/2022/ |
op_doi |
https://doi.org/10.5194/bg-19-4089-2022 |
container_title |
Biogeosciences |
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19 |
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17 |
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4089 |
op_container_end_page |
4105 |
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1766342813607264256 |