Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean
Heterotrophic bacterial abundance and production, dissolved free amino acid (DFAA) and dissolved combined amino acid (DCAA) concentrations, and other microbial parameters were determined for seawater samples collected at a fixed station (maximum water depth, 56 m) deployed on the Chukchi Sea Shelf,...
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ftdoajarticles:oai:doaj.org/article:d47043798c464861b6d6504984e911e9 2023-05-15T14:58:04+02:00 Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean Mario Uchimiya Chiaki Motegi Shigeto Nishino Yusuke Kawaguchi Jun Inoue Hiroshi Ogawa Toshi Nagata 2016-11-01T00:00:00Z https://doi.org/10.3389/fmars.2016.00231 https://doaj.org/article/d47043798c464861b6d6504984e911e9 EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00231/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00231 https://doaj.org/article/d47043798c464861b6d6504984e911e9 Frontiers in Marine Science, Vol 3 (2016) heterotrophic bacteria phytoplankton bloom Arctic Ocean sedimentary resuspension wind-induced event Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2016 ftdoajarticles https://doi.org/10.3389/fmars.2016.00231 2022-12-31T13:11:59Z Heterotrophic bacterial abundance and production, dissolved free amino acid (DFAA) and dissolved combined amino acid (DCAA) concentrations, and other microbial parameters were determined for seawater samples collected at a fixed station (maximum water depth, 56 m) deployed on the Chukchi Sea Shelf, in the western Arctic Ocean, during a 16-day period in September 2013. During the investigation period, the sampling station experienced strong winds and a subsequent phytoplankton bloom, which was thought to be triggered by enhanced vertical mixing and upward nutrient fluxes. In this study, we investigated whether bacterial and dissolved amino acid parameters changed in response to these physical and biogeochemical events. Bacterial abundance and production in the upper layer increased with increasing chlorophyll a concentration, despite a concomitant decrease in seawater temperature from 3.2°C to 1.5°C. The percentage of bacteria with high nucleic acid content during the bloom was significantly higher than that during the prebloom period. The ratio of the depth-integrated (0–20 m) bacterial production to primary production differed little between the prebloom and bloom period, with an overall average value of 0.14 ± 0.03 (± standard deviation, n = 8). DFAA and DCAA concentrations varied over a limited range throughout the investigation, indicating that the supply and consumption of labile dissolved amino acids were balanced. These results indicate that there was a tightly coupled, large flow of organic carbon from primary producers to heterotrophic bacteria during the fall bloom. Our data also revealed that bacterial production and abundance were high in the bottom nepheloid (low transmittance) layer during strong wind events, which was associated with sediment resuspension due to turbulence near the seafloor. The impacts of fall wind events, which are predicted to become more prominent with the extension of the ice-free period, on bacterial processes and the dynamics of organic matter in the Chukchi Sea Shelf could ... Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Chukchi Sea Frontiers in Marine Science 3 |
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op_collection_id |
ftdoajarticles |
language |
English |
topic |
heterotrophic bacteria phytoplankton bloom Arctic Ocean sedimentary resuspension wind-induced event Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
heterotrophic bacteria phytoplankton bloom Arctic Ocean sedimentary resuspension wind-induced event Science Q General. Including nature conservation geographical distribution QH1-199.5 Mario Uchimiya Chiaki Motegi Shigeto Nishino Yusuke Kawaguchi Jun Inoue Hiroshi Ogawa Toshi Nagata Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
topic_facet |
heterotrophic bacteria phytoplankton bloom Arctic Ocean sedimentary resuspension wind-induced event Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Heterotrophic bacterial abundance and production, dissolved free amino acid (DFAA) and dissolved combined amino acid (DCAA) concentrations, and other microbial parameters were determined for seawater samples collected at a fixed station (maximum water depth, 56 m) deployed on the Chukchi Sea Shelf, in the western Arctic Ocean, during a 16-day period in September 2013. During the investigation period, the sampling station experienced strong winds and a subsequent phytoplankton bloom, which was thought to be triggered by enhanced vertical mixing and upward nutrient fluxes. In this study, we investigated whether bacterial and dissolved amino acid parameters changed in response to these physical and biogeochemical events. Bacterial abundance and production in the upper layer increased with increasing chlorophyll a concentration, despite a concomitant decrease in seawater temperature from 3.2°C to 1.5°C. The percentage of bacteria with high nucleic acid content during the bloom was significantly higher than that during the prebloom period. The ratio of the depth-integrated (0–20 m) bacterial production to primary production differed little between the prebloom and bloom period, with an overall average value of 0.14 ± 0.03 (± standard deviation, n = 8). DFAA and DCAA concentrations varied over a limited range throughout the investigation, indicating that the supply and consumption of labile dissolved amino acids were balanced. These results indicate that there was a tightly coupled, large flow of organic carbon from primary producers to heterotrophic bacteria during the fall bloom. Our data also revealed that bacterial production and abundance were high in the bottom nepheloid (low transmittance) layer during strong wind events, which was associated with sediment resuspension due to turbulence near the seafloor. The impacts of fall wind events, which are predicted to become more prominent with the extension of the ice-free period, on bacterial processes and the dynamics of organic matter in the Chukchi Sea Shelf could ... |
format |
Article in Journal/Newspaper |
author |
Mario Uchimiya Chiaki Motegi Shigeto Nishino Yusuke Kawaguchi Jun Inoue Hiroshi Ogawa Toshi Nagata |
author_facet |
Mario Uchimiya Chiaki Motegi Shigeto Nishino Yusuke Kawaguchi Jun Inoue Hiroshi Ogawa Toshi Nagata |
author_sort |
Mario Uchimiya |
title |
Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
title_short |
Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
title_full |
Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
title_fullStr |
Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
title_full_unstemmed |
Coupled Response of Bacterial Production to a Wind-induced Fall Phytoplankton Bloom and Sediment Resuspension in the Chukchi Sea Shelf, Western Arctic Ocean |
title_sort |
coupled response of bacterial production to a wind-induced fall phytoplankton bloom and sediment resuspension in the chukchi sea shelf, western arctic ocean |
publisher |
Frontiers Media S.A. |
publishDate |
2016 |
url |
https://doi.org/10.3389/fmars.2016.00231 https://doaj.org/article/d47043798c464861b6d6504984e911e9 |
geographic |
Arctic Arctic Ocean Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton |
op_source |
Frontiers in Marine Science, Vol 3 (2016) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00231/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00231 https://doaj.org/article/d47043798c464861b6d6504984e911e9 |
op_doi |
https://doi.org/10.3389/fmars.2016.00231 |
container_title |
Frontiers in Marine Science |
container_volume |
3 |
_version_ |
1766330148145070080 |