Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams
Abstract Much work has been performed to investigate controls on nitrogen (N) uptake in streams, yet the fate of assimilated N is comparatively poorly resolved. Here, we use in‐stream fixed N as an isotopic tracer to study the fate of assimilated N in glacial meltwater streams. We characterized δ 15...
Published in: | Limnology and Oceanography Letters |
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Online Access: | http://dx.doi.org/10.1002/lol2.10087 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flol2.10087 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lol2.10087 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Flol2.10087 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 |
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crwiley:10.1002/lol2.10087 2024-09-15T18:31:14+00:00 Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams Kohler, Tyler J. Stanish, Lee F. Liptzin, Daniel Barrett, John E. McKnight, Diane M. Office of Polar Programs 2018 http://dx.doi.org/10.1002/lol2.10087 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flol2.10087 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lol2.10087 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Flol2.10087 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography Letters volume 3, issue 4, page 357-364 ISSN 2378-2242 2378-2242 journal-article 2018 crwiley https://doi.org/10.1002/lol2.10087 2024-08-22T04:17:43Z Abstract Much work has been performed to investigate controls on nitrogen (N) uptake in streams, yet the fate of assimilated N is comparatively poorly resolved. Here, we use in‐stream fixed N as an isotopic tracer to study the fate of assimilated N in glacial meltwater streams. We characterized δ 15 N signatures of Oscillatorean, Chlorophyte, and N‐fixing Nostoc mats over the lengths of two streams, and transported particulate organic matter (POM) in one. POM was isotopically most similar to Nostoc , which always had values near the atmospheric standard (δ 15 N ≅ 0‰), suggesting N‐fixation. Other mat types were depleted upstream, and became progressively enriched downstream (plateauing at δ 15 N ≅ 0‰), indicating a shift in N source. These results collectively show that Nostoc ‐derived N is mobilized, mineralized, and increasingly assimilated downstream as more depleted glacier‐derived N is exhausted, demonstrating the importance of organic matter processing to balancing elemental budgets, and improving our understanding of nutrient cycling in lotic environments. Article in Journal/Newspaper polar desert Wiley Online Library Limnology and Oceanography Letters 3 4 357 364 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Much work has been performed to investigate controls on nitrogen (N) uptake in streams, yet the fate of assimilated N is comparatively poorly resolved. Here, we use in‐stream fixed N as an isotopic tracer to study the fate of assimilated N in glacial meltwater streams. We characterized δ 15 N signatures of Oscillatorean, Chlorophyte, and N‐fixing Nostoc mats over the lengths of two streams, and transported particulate organic matter (POM) in one. POM was isotopically most similar to Nostoc , which always had values near the atmospheric standard (δ 15 N ≅ 0‰), suggesting N‐fixation. Other mat types were depleted upstream, and became progressively enriched downstream (plateauing at δ 15 N ≅ 0‰), indicating a shift in N source. These results collectively show that Nostoc ‐derived N is mobilized, mineralized, and increasingly assimilated downstream as more depleted glacier‐derived N is exhausted, demonstrating the importance of organic matter processing to balancing elemental budgets, and improving our understanding of nutrient cycling in lotic environments. |
author2 |
Office of Polar Programs |
format |
Article in Journal/Newspaper |
author |
Kohler, Tyler J. Stanish, Lee F. Liptzin, Daniel Barrett, John E. McKnight, Diane M. |
spellingShingle |
Kohler, Tyler J. Stanish, Lee F. Liptzin, Daniel Barrett, John E. McKnight, Diane M. Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
author_facet |
Kohler, Tyler J. Stanish, Lee F. Liptzin, Daniel Barrett, John E. McKnight, Diane M. |
author_sort |
Kohler, Tyler J. |
title |
Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
title_short |
Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
title_full |
Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
title_fullStr |
Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
title_full_unstemmed |
Catch and release: Hyporheic retention and mineralization of N‐fixing Nostoc sustains downstream microbial mat biomass in two polar desert streams |
title_sort |
catch and release: hyporheic retention and mineralization of n‐fixing nostoc sustains downstream microbial mat biomass in two polar desert streams |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/lol2.10087 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flol2.10087 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lol2.10087 http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2Flol2.10087 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10087 |
genre |
polar desert |
genre_facet |
polar desert |
op_source |
Limnology and Oceanography Letters volume 3, issue 4, page 357-364 ISSN 2378-2242 2378-2242 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lol2.10087 |
container_title |
Limnology and Oceanography Letters |
container_volume |
3 |
container_issue |
4 |
container_start_page |
357 |
op_container_end_page |
364 |
_version_ |
1810472843597578240 |