Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool
<p>Glaciers export ancient bioavailable dissolved organic carbon (DOC). Yet, the sources of organic carbon (OC) underpinning bioavailability are poorly constrained. We assessed the isotopic composition of respired OC from bioincubations of glacier DOC. Relative to bulk DOC, respired OC was you...
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Copernicus Publications
2025-08-01
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| Series: | The Cryosphere |
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| author | A. D. Holt A. D. Holt A. D. Holt A. D. Holt J. B. Fellman J. B. Fellman A. M. Kellerman A. M. Kellerman E. Hood E. Hood S. H. Bosman A. M. McKenna A. M. McKenna J. P. Chanton R. G. M. Spencer R. G. M. Spencer |
| author_facet | A. D. Holt A. D. Holt A. D. Holt A. D. Holt J. B. Fellman J. B. Fellman A. M. Kellerman A. M. Kellerman E. Hood E. Hood S. H. Bosman A. M. McKenna A. M. McKenna J. P. Chanton R. G. M. Spencer R. G. M. Spencer |
| author_sort | A. D. Holt |
| collection | DOAJ |
| description | <p>Glaciers export ancient bioavailable dissolved organic carbon (DOC). Yet, the sources of organic carbon (OC) underpinning bioavailability are poorly constrained. We assessed the isotopic composition of respired OC from bioincubations of glacier DOC. Relative to bulk DOC, respired OC was younger (<span class="inline-formula">+4350</span> to 8940 <span class="inline-formula">years</span>) and <span class="inline-formula"><sup>13</sup>C</span> enriched (<span class="inline-formula">+9.2</span> ‰ to 12.2 ‰), consistent with utilization of an in situ-produced microbial carbon source. These findings provide direct evidence that a hidden pool of young OC may underpin the high bioavailability of ancient glacier DOC.</p> |
| format | Article |
| id | doaj-art-d9297968bd5a4e258ff5e96e2e2774ce |
| institution | DOAJ |
| issn | 1994-0416 1994-0424 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The Cryosphere |
| spelling | doaj-art-d9297968bd5a4e258ff5e96e2e2774ce2025-08-20T03:18:38ZengCopernicus PublicationsThe Cryosphere1994-04161994-04242025-08-01192769277710.5194/tc-19-2769-2025Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon poolA. D. Holt0A. D. Holt1A. D. Holt2A. D. Holt3J. B. Fellman4J. B. Fellman5A. M. Kellerman6A. M. Kellerman7E. Hood8E. Hood9S. H. Bosman10A. M. McKenna11A. M. McKenna12J. P. Chanton13R. G. M. Spencer14R. G. M. Spencer15National High Magnetic Field Laboratory Geochemistry Group, Florida State University, Tallahassee, FL 32306, USA.Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, USAProgram on the Environment, University of Alaska Southeast, Juneau, AK 99801, USAAlaska Coastal Rainforest Center, University of Alaska Southeast, Juneau, AK 99801, USAProgram on the Environment, University of Alaska Southeast, Juneau, AK 99801, USAAlaska Coastal Rainforest Center, University of Alaska Southeast, Juneau, AK 99801, USANational High Magnetic Field Laboratory Geochemistry Group, Florida State University, Tallahassee, FL 32306, USA.Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, USAProgram on the Environment, University of Alaska Southeast, Juneau, AK 99801, USAAlaska Coastal Rainforest Center, University of Alaska Southeast, Juneau, AK 99801, USADepartment of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, USANational High Magnetic Field Laboratory Geochemistry Group, Florida State University, Tallahassee, FL 32306, USA.Department of Soil Crop Sciences, Colorado State University, Fort Collins, CO 80523-1170, United StatesDepartment of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, USANational High Magnetic Field Laboratory Geochemistry Group, Florida State University, Tallahassee, FL 32306, USA.Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, USA<p>Glaciers export ancient bioavailable dissolved organic carbon (DOC). Yet, the sources of organic carbon (OC) underpinning bioavailability are poorly constrained. We assessed the isotopic composition of respired OC from bioincubations of glacier DOC. Relative to bulk DOC, respired OC was younger (<span class="inline-formula">+4350</span> to 8940 <span class="inline-formula">years</span>) and <span class="inline-formula"><sup>13</sup>C</span> enriched (<span class="inline-formula">+9.2</span> ‰ to 12.2 ‰), consistent with utilization of an in situ-produced microbial carbon source. These findings provide direct evidence that a hidden pool of young OC may underpin the high bioavailability of ancient glacier DOC.</p>https://tc.copernicus.org/articles/19/2769/2025/tc-19-2769-2025.pdf |
| spellingShingle | A. D. Holt A. D. Holt A. D. Holt A. D. Holt J. B. Fellman J. B. Fellman A. M. Kellerman A. M. Kellerman E. Hood E. Hood S. H. Bosman A. M. McKenna A. M. McKenna J. P. Chanton R. G. M. Spencer R. G. M. Spencer Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool The Cryosphere |
| title | Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| title_full | Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| title_fullStr | Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| title_full_unstemmed | Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| title_short | Brief communication: Stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| title_sort | brief communication stream microbes preferentially respire young carbon within the ancient glacier dissolved organic carbon pool |
| url | https://tc.copernicus.org/articles/19/2769/2025/tc-19-2769-2025.pdf |
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