Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S)
The biogeochemical dynamics of fjords around Antarctica are strongly influenced by cryospheric, climatic, and oceanographic processes that occur on a seasonal scale. Furthermore, as global climate change continues, there is a growing awareness of the impact of ocean warming on glacier melting, which...
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| Format: | Article |
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Frontiers Media S.A.
2023-08-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2023.1174722/full |
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| author | Misa Jeon Misa Jeon José Luis Iriarte Eun Jin Yang Jisoo Park Catharina Alves-de-Souza Sang Jong Park |
| author_facet | Misa Jeon Misa Jeon José Luis Iriarte Eun Jin Yang Jisoo Park Catharina Alves-de-Souza Sang Jong Park |
| author_sort | Misa Jeon |
| collection | DOAJ |
| description | The biogeochemical dynamics of fjords around Antarctica are strongly influenced by cryospheric, climatic, and oceanographic processes that occur on a seasonal scale. Furthermore, as global climate change continues, there is a growing awareness of the impact of ocean warming on glacier melting, which is expected to affect the composition of phytoplankton community structure in West Antarctica’s nearshore marine areas. In this study, we describe the role of hydrographic forcing on the short-term summer variability of the phytoplankton community in Marian Cove, an Antarctic glacial fjord (62°S). Phytoplankton and hydrographic variables were measured at five stations along the Marian Cove during summer 2019 (January–February). The highest concentrations of microphytoplankton biomass were found in the outer area of the fjord, whereas nanophytoplankton biomass displayed continued dominance during most of the summer period in Marian Cove. Hydrographic assessment showed that freshwater inputs from the glacier influenced the surface layer of the fjord, modulating phytoplankton biomass, which was dominated by nanodiatoms (Minidiscus sp., Thalassiosira spp.) and nanophytoflagellates (Cryptomonas spp., Phaeocystis sp.). Concurrent measurement of phytoplankton biomass and environmental conditions during December 2018–January 2019 indicated that a period of weak southeastern winds generated vertical stability, which led to the development of a major peak of microphytoplankton biomass in the outer cove, driven by warm, allochthonous, oceanic, nutrient-rich waters. High carbon biomass dominated by nanodiatoms and nanophytoflagellates was observed in cold, fresh, and low-light subsurface waters of the cove. Our results highlight the effects of a warming ocean, which may favor the summer resurgence of nanodiatom and nanophytoflagellate communities in Antarctic fjords due to increased glacial meltwater inputs. |
| first_indexed | 2024-03-08T16:39:44Z |
| format | Article |
| id | doaj.art-fbd1c5950fc24cd89fdaf0652cfbad0f |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-03-08T16:39:44Z |
| publishDate | 2023-08-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-fbd1c5950fc24cd89fdaf0652cfbad0f2024-01-05T10:54:28ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452023-08-011010.3389/fmars.2023.11747221174722Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S)Misa Jeon0Misa Jeon1José Luis Iriarte2Eun Jin Yang3Jisoo Park4Catharina Alves-de-Souza5Sang Jong Park6Division of Ocean Sciences, Korea Polar Research Institute, Incheon, Republic of KoreaDepartment of Biological Sciences and Bioengineering, Inha University, Incheon, Republic of KoreaResearch Center, Centro de Investigación: Dinámica de Ecosistemas Marinos de Altas Latitudes IDEAL (FONDAP IDEAL), Instituto de Acuicultura, Universidad Austral de Chile, Puerto Montt, ChileDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, Republic of KoreaDivision of Ocean Sciences, Korea Polar Research Institute, Incheon, Republic of KoreaAlgal Resources Collection, Center for Marine Science, University of North Carolina Wilmington, Wilmington, NC, United StatesDivision of Climate Science, Korea Polar Research Institute, Incheon, Republic of KoreaThe biogeochemical dynamics of fjords around Antarctica are strongly influenced by cryospheric, climatic, and oceanographic processes that occur on a seasonal scale. Furthermore, as global climate change continues, there is a growing awareness of the impact of ocean warming on glacier melting, which is expected to affect the composition of phytoplankton community structure in West Antarctica’s nearshore marine areas. In this study, we describe the role of hydrographic forcing on the short-term summer variability of the phytoplankton community in Marian Cove, an Antarctic glacial fjord (62°S). Phytoplankton and hydrographic variables were measured at five stations along the Marian Cove during summer 2019 (January–February). The highest concentrations of microphytoplankton biomass were found in the outer area of the fjord, whereas nanophytoplankton biomass displayed continued dominance during most of the summer period in Marian Cove. Hydrographic assessment showed that freshwater inputs from the glacier influenced the surface layer of the fjord, modulating phytoplankton biomass, which was dominated by nanodiatoms (Minidiscus sp., Thalassiosira spp.) and nanophytoflagellates (Cryptomonas spp., Phaeocystis sp.). Concurrent measurement of phytoplankton biomass and environmental conditions during December 2018–January 2019 indicated that a period of weak southeastern winds generated vertical stability, which led to the development of a major peak of microphytoplankton biomass in the outer cove, driven by warm, allochthonous, oceanic, nutrient-rich waters. High carbon biomass dominated by nanodiatoms and nanophytoflagellates was observed in cold, fresh, and low-light subsurface waters of the cove. Our results highlight the effects of a warming ocean, which may favor the summer resurgence of nanodiatom and nanophytoflagellate communities in Antarctic fjords due to increased glacial meltwater inputs.https://www.frontiersin.org/articles/10.3389/fmars.2023.1174722/fullglacial freshwatercell carbon biomassAntarctic shallow fjordsdiatomsnanophytoflagellatesphytoplankton size fractions |
| spellingShingle | Misa Jeon Misa Jeon José Luis Iriarte Eun Jin Yang Jisoo Park Catharina Alves-de-Souza Sang Jong Park Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) Frontiers in Marine Science glacial freshwater cell carbon biomass Antarctic shallow fjords diatoms nanophytoflagellates phytoplankton size fractions |
| title | Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) |
| title_full | Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) |
| title_fullStr | Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) |
| title_full_unstemmed | Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) |
| title_short | Importance of nanophytoplankton biomass during summer 2019 in a retreating marine-terminating glacier-fjord system, Marian Cove, West Antarctica (62°S) |
| title_sort | importance of nanophytoplankton biomass during summer 2019 in a retreating marine terminating glacier fjord system marian cove west antarctica 62°s |
| topic | glacial freshwater cell carbon biomass Antarctic shallow fjords diatoms nanophytoflagellates phytoplankton size fractions |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2023.1174722/full |
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