Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean
Dissolved organic carbon (DOC) and total dissolved amino acids (TDAA) were measured in high (Chukchi Sea) and low (Beaufort Sea) productivity regions of the western Arctic Ocean to investigate the composition and bioavailability of dissolved organic matter (DOM). Concentrations and DOC-normalized yi...
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ftdoajarticles:oai:doaj.org/article:e79475b052a444d09378a2c1c70364dc 2023-05-15T14:51:10+02:00 Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean Y. Shen C. G. Fichot R. Benner 2012-12-01T00:00:00Z https://doi.org/10.5194/bg-9-4993-2012 https://doaj.org/article/e79475b052a444d09378a2c1c70364dc EN eng Copernicus Publications http://www.biogeosciences.net/9/4993/2012/bg-9-4993-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4993-2012 1726-4170 1726-4189 https://doaj.org/article/e79475b052a444d09378a2c1c70364dc Biogeosciences, Vol 9, Iss 12, Pp 4993-5005 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-4993-2012 2022-12-30T23:35:38Z Dissolved organic carbon (DOC) and total dissolved amino acids (TDAA) were measured in high (Chukchi Sea) and low (Beaufort Sea) productivity regions of the western Arctic Ocean to investigate the composition and bioavailability of dissolved organic matter (DOM). Concentrations and DOC-normalized yields of TDAA in Chukchi surface waters were relatively high, indicating an accumulation of bioavailable DOM. High concentrations and yields of TDAA were also observed in the upper halocline of slope and basin waters, indicating off-shelf transport of bioavailable DOM from the Chukchi Sea. In contrast, concentrations and yields of TDAA in Beaufort surface waters were relatively low, indicting DOM was of limited bioavailability. Concentrations and yields of TDAA in the upper halocline of slope and basin waters were also low, suggesting the Beaufort is not a major source of bioavailable DOM to slope and basin waters. In shelf waters of both systems, elevated concentrations and yields of TDAA were often observed in waters with higher chlorophyll concentrations and productivity. Surface concentrations of DOC were similar ( p > 0.05) in the two systems despite the contrasting productivity, but concentrations and yields of TDAA were significantly higher ( p < 0.0001) in the Chukchi than in the Beaufort. Unlike bulk DOC, TDAA concentrations and yields reflect ecosystem productivity in the western Arctic. The occurrence of elevated bioavailable DOM concentrations in the Chukchi Sea implies an uncoupling between the biological production and utilization of DOM and has important implications for sustaining heterotrophic microbial growth and diversity in oligotrophic waters of the central Arctic basins. Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Chukchi Sea Biogeosciences 9 12 4993 5005 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 Y. Shen C. G. Fichot R. Benner Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Dissolved organic carbon (DOC) and total dissolved amino acids (TDAA) were measured in high (Chukchi Sea) and low (Beaufort Sea) productivity regions of the western Arctic Ocean to investigate the composition and bioavailability of dissolved organic matter (DOM). Concentrations and DOC-normalized yields of TDAA in Chukchi surface waters were relatively high, indicating an accumulation of bioavailable DOM. High concentrations and yields of TDAA were also observed in the upper halocline of slope and basin waters, indicating off-shelf transport of bioavailable DOM from the Chukchi Sea. In contrast, concentrations and yields of TDAA in Beaufort surface waters were relatively low, indicting DOM was of limited bioavailability. Concentrations and yields of TDAA in the upper halocline of slope and basin waters were also low, suggesting the Beaufort is not a major source of bioavailable DOM to slope and basin waters. In shelf waters of both systems, elevated concentrations and yields of TDAA were often observed in waters with higher chlorophyll concentrations and productivity. Surface concentrations of DOC were similar ( p > 0.05) in the two systems despite the contrasting productivity, but concentrations and yields of TDAA were significantly higher ( p < 0.0001) in the Chukchi than in the Beaufort. Unlike bulk DOC, TDAA concentrations and yields reflect ecosystem productivity in the western Arctic. The occurrence of elevated bioavailable DOM concentrations in the Chukchi Sea implies an uncoupling between the biological production and utilization of DOM and has important implications for sustaining heterotrophic microbial growth and diversity in oligotrophic waters of the central Arctic basins. |
format |
Article in Journal/Newspaper |
author |
Y. Shen C. G. Fichot R. Benner |
author_facet |
Y. Shen C. G. Fichot R. Benner |
author_sort |
Y. Shen |
title |
Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
title_short |
Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
title_full |
Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
title_fullStr |
Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
title_full_unstemmed |
Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean |
title_sort |
dissolved organic matter composition and bioavailability reflect ecosystem productivity in the western arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-4993-2012 https://doaj.org/article/e79475b052a444d09378a2c1c70364dc |
geographic |
Arctic Arctic Ocean Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea |
genre |
Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Chukchi Chukchi Sea |
op_source |
Biogeosciences, Vol 9, Iss 12, Pp 4993-5005 (2012) |
op_relation |
http://www.biogeosciences.net/9/4993/2012/bg-9-4993-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4993-2012 1726-4170 1726-4189 https://doaj.org/article/e79475b052a444d09378a2c1c70364dc |
op_doi |
https://doi.org/10.5194/bg-9-4993-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
12 |
container_start_page |
4993 |
op_container_end_page |
5005 |
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1766322227543801856 |