Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments
Colonization of newly ice-free areas by marine benthic organisms intensifies burial of macroalgae detritus in Potter Cove coastal surface sediments (Western Antarctic Peninsula). Thus, fresh and labile macroalgal detritus serves as primary organic matter (OM) source for microbial degradation. Here,...
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2021
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Online Access: | https://epic.awi.de/id/eprint/54007/ https://www.sciencedirect.com/science/article/pii/S0160412021002270 https://hdl.handle.net/10013/epic.cfe119f2-e304-4192-b75d-ce6e7cef44ee |
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ftawi:oai:epic.awi.de:54007 2024-09-15T17:41:09+00:00 Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments Aromokeye, David A. Willis-Poratti, Graciana Wunder, Lea C. Yin, Xiuran Wendt, Jenny Richter-Heitmann, Tim Henkel, Susann Vázquez, Susana Elvert, Marcus Mac Cormack, Walter Friedrich, Michael W. 2021-05-26 https://epic.awi.de/id/eprint/54007/ https://www.sciencedirect.com/science/article/pii/S0160412021002270 https://hdl.handle.net/10013/epic.cfe119f2-e304-4192-b75d-ce6e7cef44ee unknown PERGAMON-ELSEVIER SCIENCE LTD Aromokeye, D. A. , Willis-Poratti, G. , Wunder, L. C. , Yin, X. , Wendt, J. , Richter-Heitmann, T. , Henkel, S. orcid:0000-0001-7490-0237 , Vázquez, S. , Elvert, M. , Mac Cormack, W. and Friedrich, M. W. (2021) Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments , Environment International . doi:10.1016/j.envint.2021.106602 <https://doi.org/10.1016/j.envint.2021.106602> , hdl:10013/epic.cfe119f2-e304-4192-b75d-ce6e7cef44ee EPIC3Environment International, PERGAMON-ELSEVIER SCIENCE LTD, ISSN: 0160-4120 Article isiRev 2021 ftawi https://doi.org/10.1016/j.envint.2021.106602 2024-06-24T04:26:11Z Colonization of newly ice-free areas by marine benthic organisms intensifies burial of macroalgae detritus in Potter Cove coastal surface sediments (Western Antarctic Peninsula). Thus, fresh and labile macroalgal detritus serves as primary organic matter (OM) source for microbial degradation. Here, we investigated the effects on post-depositional microbial iron reduction in Potter Cove using sediment incubations amended with pulverized macroalgal detritus as OM source, acetate as primary product of OM degradation and lepidocrocite as reactive iron oxide to mimic in situ conditions. Humic substances analogue anthraquinone-2,6-disulfonic acid (AQDS) was also added to some treatments to simulate potential for electron shuttling. Microbial iron reduction was promoted by macroalgae and further enhanced by up to 30-folds with AQDS. Notably, while acetate amendment alone did not stimulate iron reduction, adding macroalgae alone did. Acetate, formate, lactate, butyrate and propionate were detected as fermentation products from macroalgae degradation. By combining 16S rRNA gene sequencing and RNA stable isotope probing, we reconstructed the potential microbial food chain from macroalgae degraders to iron reducers. Psychromonas, Marinifilum, Moritella, and Colwellia were detected as potential fermenters of macroalgae and fermentation products such as lactate. Members of class deltaproteobacteria including Sva1033, Desulfuromonas, and Desulfuromusa together with Arcobacter (former phylum Epsilonbacteraeota, now Campylobacterota) acted as dissimilatory iron reducers. Our findings demonstrate that increasing burial of macroalgal detritus in an Antarctic fjord affected by glacier retreat intensifies early diagenetic processes such as iron reduction. Under scenarios of global warming, the active microbial populations identified above will expand their environmental function, facilitate OM remineralisation, and contribute to an increased release of iron and CO2 from sediments. Such indirect consequences of glacial retreat are ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Environment International 156 106602 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Colonization of newly ice-free areas by marine benthic organisms intensifies burial of macroalgae detritus in Potter Cove coastal surface sediments (Western Antarctic Peninsula). Thus, fresh and labile macroalgal detritus serves as primary organic matter (OM) source for microbial degradation. Here, we investigated the effects on post-depositional microbial iron reduction in Potter Cove using sediment incubations amended with pulverized macroalgal detritus as OM source, acetate as primary product of OM degradation and lepidocrocite as reactive iron oxide to mimic in situ conditions. Humic substances analogue anthraquinone-2,6-disulfonic acid (AQDS) was also added to some treatments to simulate potential for electron shuttling. Microbial iron reduction was promoted by macroalgae and further enhanced by up to 30-folds with AQDS. Notably, while acetate amendment alone did not stimulate iron reduction, adding macroalgae alone did. Acetate, formate, lactate, butyrate and propionate were detected as fermentation products from macroalgae degradation. By combining 16S rRNA gene sequencing and RNA stable isotope probing, we reconstructed the potential microbial food chain from macroalgae degraders to iron reducers. Psychromonas, Marinifilum, Moritella, and Colwellia were detected as potential fermenters of macroalgae and fermentation products such as lactate. Members of class deltaproteobacteria including Sva1033, Desulfuromonas, and Desulfuromusa together with Arcobacter (former phylum Epsilonbacteraeota, now Campylobacterota) acted as dissimilatory iron reducers. Our findings demonstrate that increasing burial of macroalgal detritus in an Antarctic fjord affected by glacier retreat intensifies early diagenetic processes such as iron reduction. Under scenarios of global warming, the active microbial populations identified above will expand their environmental function, facilitate OM remineralisation, and contribute to an increased release of iron and CO2 from sediments. Such indirect consequences of glacial retreat are ... |
format |
Article in Journal/Newspaper |
author |
Aromokeye, David A. Willis-Poratti, Graciana Wunder, Lea C. Yin, Xiuran Wendt, Jenny Richter-Heitmann, Tim Henkel, Susann Vázquez, Susana Elvert, Marcus Mac Cormack, Walter Friedrich, Michael W. |
spellingShingle |
Aromokeye, David A. Willis-Poratti, Graciana Wunder, Lea C. Yin, Xiuran Wendt, Jenny Richter-Heitmann, Tim Henkel, Susann Vázquez, Susana Elvert, Marcus Mac Cormack, Walter Friedrich, Michael W. Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
author_facet |
Aromokeye, David A. Willis-Poratti, Graciana Wunder, Lea C. Yin, Xiuran Wendt, Jenny Richter-Heitmann, Tim Henkel, Susann Vázquez, Susana Elvert, Marcus Mac Cormack, Walter Friedrich, Michael W. |
author_sort |
Aromokeye, David A. |
title |
Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
title_short |
Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
title_full |
Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
title_fullStr |
Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
title_full_unstemmed |
Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments |
title_sort |
macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal antarctic sediments |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54007/ https://www.sciencedirect.com/science/article/pii/S0160412021002270 https://hdl.handle.net/10013/epic.cfe119f2-e304-4192-b75d-ce6e7cef44ee |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
EPIC3Environment International, PERGAMON-ELSEVIER SCIENCE LTD, ISSN: 0160-4120 |
op_relation |
Aromokeye, D. A. , Willis-Poratti, G. , Wunder, L. C. , Yin, X. , Wendt, J. , Richter-Heitmann, T. , Henkel, S. orcid:0000-0001-7490-0237 , Vázquez, S. , Elvert, M. , Mac Cormack, W. and Friedrich, M. W. (2021) Macroalgae degradation promotes microbial iron reduction via electron shuttling in coastal Antarctic sediments , Environment International . doi:10.1016/j.envint.2021.106602 <https://doi.org/10.1016/j.envint.2021.106602> , hdl:10013/epic.cfe119f2-e304-4192-b75d-ce6e7cef44ee |
op_doi |
https://doi.org/10.1016/j.envint.2021.106602 |
container_title |
Environment International |
container_volume |
156 |
container_start_page |
106602 |
_version_ |
1810487261182033920 |