Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica
We investigated changes in heterotrophic bacterial metabolic activities and associated carbon cycles in response to a change in dominant phytoplankton communities during two contrasting environmental conditions in austral summer in the Amundsen Sea polynya (ASP), Antarctica: the closed polynya condi...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-06-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2022.872052/full |
| _version_ | 1818534516442005504 |
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| author | Bomina Kim Bomina Kim Sung-Han Kim Sung-Han Kim Jun-Oh Min Jun-Oh Min Youngju Lee Jinyoung Jung Tae-Wan Kim Jae Seong Lee Eun Jin Yang Jisoo Park SangHoon Lee Jung-Ho Hyun |
| author_facet | Bomina Kim Bomina Kim Sung-Han Kim Sung-Han Kim Jun-Oh Min Jun-Oh Min Youngju Lee Jinyoung Jung Tae-Wan Kim Jae Seong Lee Eun Jin Yang Jisoo Park SangHoon Lee Jung-Ho Hyun |
| author_sort | Bomina Kim |
| collection | DOAJ |
| description | We investigated changes in heterotrophic bacterial metabolic activities and associated carbon cycles in response to a change in dominant phytoplankton communities during two contrasting environmental conditions in austral summer in the Amundsen Sea polynya (ASP), Antarctica: the closed polynya condition in 2014 (ANA04) and the open polynya condition in 2016 (ANA06). In ANA04, Phaeocystis antarctica predominated phytoplankton biomass, comprising 78% of total phytoplankton carbon biomass, whereas diatoms and Dictyocha speculum accounted for 45% and 48% of total phytoplankton carbon biomass, respectively, in ANA06. Bacterial production (BP) showed a significant positive correlation with only chlorophyll-a (Chl-a, rho = 0.66, p < 0.001) in P. antarctica-dominated ANA04, whereas there were significant positive relationships of BP with various organic carbon pools, such as chromophoric dissolved organic matter (CDOM, rho = 0.84, p < 0.001), Chl-a (rho = 0.59, p < 0.001), and dissolved organic carbon (DOC, rho = 0.51, p = 0.001), in ANA06 when diatoms and D. speculum co-dominated. These results indicate that BP depended more on DOC directly released from P. antarctica in ANA04, but was supported by DOC derived from various food web processes in the diatom-dominated system in ANA06. The BP to primary production (BP : PP) ratio was three-fold higher in P. antarctica-dominated ANA04 (BP: PP = 0.09), than in diatom- and D. speculum-co-dominated ANA06 (BP : PP = 0.03). These results suggested that the microbial loop is more significant in Phaeocystis-dominated conditions than in diatom-dominated conditions. In addition, the decreases in BP : PP ratio and bacterial respiration with increasing diatom proportion in the surface mixed layer indicated that the change from P. antarctica to diatom predominance enhanced biological carbon pump function by increasing particulate organic carbon export efficiency. Consequently, our results suggest that bacterial metabolic response to shifts in phytoplankton communities could ultimately affect larger-scale ecological and biogeochemical processes in the water column of the ASP. |
| first_indexed | 2024-12-11T18:12:39Z |
| format | Article |
| id | doaj.art-67cff135a5aa4033a4b57301c5ddf339 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-11T18:12:39Z |
| publishDate | 2022-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-67cff135a5aa4033a4b57301c5ddf3392022-12-22T00:55:32ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452022-06-01910.3389/fmars.2022.872052872052Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, AntarcticaBomina Kim0Bomina Kim1Sung-Han Kim2Sung-Han Kim3Jun-Oh Min4Jun-Oh Min5Youngju Lee6Jinyoung Jung7Tae-Wan Kim8Jae Seong Lee9Eun Jin Yang10Jisoo Park11SangHoon Lee12Jung-Ho Hyun13Department of Marine Science and Convergence Technology, Hanyang University, Ansan, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDepartment of Marine Science and Convergence Technology, Hanyang University, Ansan, South KoreaMarine Environmental Research Center, Korea Institute of Ocean Science & Technology, Busan, South KoreaDepartment of Marine Science and Convergence Technology, Hanyang University, Ansan, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaMarine Environmental Research Center, Korea Institute of Ocean Science & Technology, Busan, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, South KoreaDepartment of Marine Science and Convergence Technology, Hanyang University, Ansan, South KoreaWe investigated changes in heterotrophic bacterial metabolic activities and associated carbon cycles in response to a change in dominant phytoplankton communities during two contrasting environmental conditions in austral summer in the Amundsen Sea polynya (ASP), Antarctica: the closed polynya condition in 2014 (ANA04) and the open polynya condition in 2016 (ANA06). In ANA04, Phaeocystis antarctica predominated phytoplankton biomass, comprising 78% of total phytoplankton carbon biomass, whereas diatoms and Dictyocha speculum accounted for 45% and 48% of total phytoplankton carbon biomass, respectively, in ANA06. Bacterial production (BP) showed a significant positive correlation with only chlorophyll-a (Chl-a, rho = 0.66, p < 0.001) in P. antarctica-dominated ANA04, whereas there were significant positive relationships of BP with various organic carbon pools, such as chromophoric dissolved organic matter (CDOM, rho = 0.84, p < 0.001), Chl-a (rho = 0.59, p < 0.001), and dissolved organic carbon (DOC, rho = 0.51, p = 0.001), in ANA06 when diatoms and D. speculum co-dominated. These results indicate that BP depended more on DOC directly released from P. antarctica in ANA04, but was supported by DOC derived from various food web processes in the diatom-dominated system in ANA06. The BP to primary production (BP : PP) ratio was three-fold higher in P. antarctica-dominated ANA04 (BP: PP = 0.09), than in diatom- and D. speculum-co-dominated ANA06 (BP : PP = 0.03). These results suggested that the microbial loop is more significant in Phaeocystis-dominated conditions than in diatom-dominated conditions. In addition, the decreases in BP : PP ratio and bacterial respiration with increasing diatom proportion in the surface mixed layer indicated that the change from P. antarctica to diatom predominance enhanced biological carbon pump function by increasing particulate organic carbon export efficiency. Consequently, our results suggest that bacterial metabolic response to shifts in phytoplankton communities could ultimately affect larger-scale ecological and biogeochemical processes in the water column of the ASP.https://www.frontiersin.org/articles/10.3389/fmars.2022.872052/fullbacterial productionbacterial respirationphytoplankton community compositionmicrobial loopbiological pumpAmundsen Sea polynya |
| spellingShingle | Bomina Kim Bomina Kim Sung-Han Kim Sung-Han Kim Jun-Oh Min Jun-Oh Min Youngju Lee Jinyoung Jung Tae-Wan Kim Jae Seong Lee Eun Jin Yang Jisoo Park SangHoon Lee Jung-Ho Hyun Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica Frontiers in Marine Science bacterial production bacterial respiration phytoplankton community composition microbial loop biological pump Amundsen Sea polynya |
| title | Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica |
| title_full | Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica |
| title_fullStr | Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica |
| title_full_unstemmed | Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica |
| title_short | Bacterial Metabolic Response to Change in Phytoplankton Communities and Resultant Effects on Carbon Cycles in the Amundsen Sea Polynya, Antarctica |
| title_sort | bacterial metabolic response to change in phytoplankton communities and resultant effects on carbon cycles in the amundsen sea polynya antarctica |
| topic | bacterial production bacterial respiration phytoplankton community composition microbial loop biological pump Amundsen Sea polynya |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2022.872052/full |
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