The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling
Microphytobenthos (MPB) at higher latitudes has been poorly studied. This study used pulse-chase 13C-labeling to investigate the production, processing, and fate of MPB-derived carbon (MPB-C) in sub-Arctic intertidal sediments over 31 d. Gross primary production (2.1 mmol C m−2 h−1 ± 0.4 mmol C m−2...
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ftsoutherncu:oai:epubs.scu.edu.au:esm_pubs-4144 2023-05-15T14:51:52+02:00 The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling Oakes, Joanne M Rysgaard, Soren Glud, Ronnie N Eyre, Bradley D 2016-01-01T08:00:00Z https://epubs.scu.edu.au/esm_pubs/3116 https://doi.org/10.1002/lno.10377 unknown ePublications@SCU School of Environment, Science and Engineering Papers Environmental Sciences article 2016 ftsoutherncu https://doi.org/10.1002/lno.10377 2019-08-06T13:10:59Z Microphytobenthos (MPB) at higher latitudes has been poorly studied. This study used pulse-chase 13C-labeling to investigate the production, processing, and fate of MPB-derived carbon (MPB-C) in sub-Arctic intertidal sediments over 31 d. Gross primary production (2.1 mmol C m−2 h−1 ± 0.4 mmol C m−2 h−1) was comparable to that reported for temperate regions. Some of the 13C fixed by sub-Arctic MPB was rapidly (within 0.5 d) transferred to deeper sediments (below 2 cm), but most was retained within surface sediments (>70.2% of the 13C present at any time during the study). At any time, MPB accounted for ≥ 49.8% of this 13C. The 13C content of sediment organic carbon declined over time, but > 31% of the 13C fixed within the first tidal cycle remained after 31 d, suggesting that sub-Arctic MPB may contribute to coastal carbon retention during the productive season. Over 21 d, 10.6% of the fixed 13C was removed via DIC fluxes and 0.3% via DOC fluxes from inundated sediment, and 0.6% as CO2 from exposed sediment. The greatest loss of 13C (38.2%) was via unmeasured pathways, including resuspension and/or removal by mobile consumers. The rates of MPB-C production and the relative importance of the pathways for MPB-C loss were similar to that observed for comparable lower latitude sediments, demonstrating that MPB at higher latitudes are not necessarily distinct from MPB at lower latitudes and probably play a similarly important role in ecosystem functioning. Apparently, local environmental conditions are more important than climate differences for determining the processing and fate of MPB-C. Article in Journal/Newspaper Arctic Southern Cross University: epublications@SCU Arctic Limnology and Oceanography 61 6 2296 2308 |
institution |
Open Polar |
collection |
Southern Cross University: epublications@SCU |
op_collection_id |
ftsoutherncu |
language |
unknown |
topic |
Environmental Sciences |
spellingShingle |
Environmental Sciences Oakes, Joanne M Rysgaard, Soren Glud, Ronnie N Eyre, Bradley D The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
topic_facet |
Environmental Sciences |
description |
Microphytobenthos (MPB) at higher latitudes has been poorly studied. This study used pulse-chase 13C-labeling to investigate the production, processing, and fate of MPB-derived carbon (MPB-C) in sub-Arctic intertidal sediments over 31 d. Gross primary production (2.1 mmol C m−2 h−1 ± 0.4 mmol C m−2 h−1) was comparable to that reported for temperate regions. Some of the 13C fixed by sub-Arctic MPB was rapidly (within 0.5 d) transferred to deeper sediments (below 2 cm), but most was retained within surface sediments (>70.2% of the 13C present at any time during the study). At any time, MPB accounted for ≥ 49.8% of this 13C. The 13C content of sediment organic carbon declined over time, but > 31% of the 13C fixed within the first tidal cycle remained after 31 d, suggesting that sub-Arctic MPB may contribute to coastal carbon retention during the productive season. Over 21 d, 10.6% of the fixed 13C was removed via DIC fluxes and 0.3% via DOC fluxes from inundated sediment, and 0.6% as CO2 from exposed sediment. The greatest loss of 13C (38.2%) was via unmeasured pathways, including resuspension and/or removal by mobile consumers. The rates of MPB-C production and the relative importance of the pathways for MPB-C loss were similar to that observed for comparable lower latitude sediments, demonstrating that MPB at higher latitudes are not necessarily distinct from MPB at lower latitudes and probably play a similarly important role in ecosystem functioning. Apparently, local environmental conditions are more important than climate differences for determining the processing and fate of MPB-C. |
format |
Article in Journal/Newspaper |
author |
Oakes, Joanne M Rysgaard, Soren Glud, Ronnie N Eyre, Bradley D |
author_facet |
Oakes, Joanne M Rysgaard, Soren Glud, Ronnie N Eyre, Bradley D |
author_sort |
Oakes, Joanne M |
title |
The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
title_short |
The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
title_full |
The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
title_fullStr |
The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
title_full_unstemmed |
The transformation and fate of sub-Arctic microphytobenthos carbon revealed through 13C-labeling |
title_sort |
transformation and fate of sub-arctic microphytobenthos carbon revealed through 13c-labeling |
publisher |
ePublications@SCU |
publishDate |
2016 |
url |
https://epubs.scu.edu.au/esm_pubs/3116 https://doi.org/10.1002/lno.10377 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
School of Environment, Science and Engineering Papers |
op_doi |
https://doi.org/10.1002/lno.10377 |
container_title |
Limnology and Oceanography |
container_volume |
61 |
container_issue |
6 |
container_start_page |
2296 |
op_container_end_page |
2308 |
_version_ |
1766323014831439872 |