Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production
<p>The drastic decline of Arctic sea ice due to global warming and polar amplification of environmental changes in the Arctic basin profoundly alter primary production with consequences for polar ecosystems and the carbon cycle. In this study, we use highly branched isoprenoids (HBIs), brassic...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-02-01
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| Series: | Biogeosciences |
| Online Access: | https://bg.copernicus.org/articles/21/689/2024/bg-21-689-2024.pdf |
| _version_ | 1797322305412530176 |
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| author | Y. Bai Y. Bai M.-A. Sicre J. Ren J. Ren V. Klein H. Jin H. Jin H. Jin J. Chen J. Chen J. Chen |
| author_facet | Y. Bai Y. Bai M.-A. Sicre J. Ren J. Ren V. Klein H. Jin H. Jin H. Jin J. Chen J. Chen J. Chen |
| author_sort | Y. Bai |
| collection | DOAJ |
| description | <p>The drastic decline of Arctic sea ice due to global warming and polar amplification of environmental changes in the Arctic basin profoundly alter primary production with consequences for polar ecosystems and the carbon cycle. In this study, we use highly branched isoprenoids (HBIs), brassicasterol, dinosterol and terrestrial biomarkers (<span class="inline-formula"><i>n</i></span>-alkanes and campesterol) in surface sediments to assess sympagic and pelagic algal production with changing sea-ice conditions along a latitudinal transect from the Bering Sea to the high latitudes of the western Arctic Ocean. Suspended particulate matter (SPM) was also collected in surface waters at several stations of the Chukchi Sea to provide snapshots of phytoplankton communities under various sea-ice conditions for comparison with underlying surface sediments. Our results show that sympagic production (IP<span class="inline-formula"><sub>25</sub></span> and HBI-II) increased northward between 62 and 73<span class="inline-formula"><sup>∘</sup></span> N, with maximum values at the sea-ice edge in the Marginal Ice Zone (MIZ) between 70 and 73<span class="inline-formula"><sup>∘</sup></span> N in the southeastern Chukchi Sea and along the coast of Alaska. It was consistently low at northern high latitudes (<span class="inline-formula">>73</span><span class="inline-formula"><sup>∘</sup></span> N) under extensive summer sea-ice cover and in the Ice-Free Zone (IFZ) of the Bering Sea. Enhanced pelagic sterols and HBI-III occurred in the IFZ across the Bering Sea and in the southeastern Chukchi Sea up to 70–73<span class="inline-formula"><sup>∘</sup></span> N in MIZ conditions, which marks a shift of sympagic over pelagic production. In surface water SPM, pelagic sterols display similar patterns as chlorophyll <span class="inline-formula"><i>a</i></span>, increasing southward with higher amounts found in the Chukchi shelf, pointing to the dominance of diatom production. Higher cholesterol values were found in the mid-Chukchi Sea shelf where phytosterols were also abundant. This compound prevailed over phytosterols in sediments, compared to SPM, reflecting efficient consumption of algal material in the water column by herbivorous zooplankton.</p> |
| first_indexed | 2024-03-08T05:11:21Z |
| format | Article |
| id | doaj.art-9a37c3defacc4c018c4a17e9c49c0ccb |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-03-08T05:11:21Z |
| publishDate | 2024-02-01 |
| publisher | Copernicus Publications |
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| series | Biogeosciences |
| spelling | doaj.art-9a37c3defacc4c018c4a17e9c49c0ccb2024-02-07T07:59:09ZengCopernicus PublicationsBiogeosciences1726-41701726-41892024-02-012168970910.5194/bg-21-689-2024Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal productionY. Bai0Y. Bai1M.-A. Sicre2J. Ren3J. Ren4V. Klein5H. Jin6H. Jin7H. Jin8J. Chen9J. Chen10J. Chen11Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, ChinaSecond Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaLOCEAN, CNRS, Sorbonne Université, Campus Pierre et Marie Curie, Case 100, 4 Place Jussieu, 75032 Paris, FranceKey Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, ChinaSecond Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaLOCEAN, CNRS, Sorbonne Université, Campus Pierre et Marie Curie, Case 100, 4 Place Jussieu, 75032 Paris, FranceKey Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, ChinaSecond Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaSchool of Oceanography, Shanghai Jiao Tong University, Shanghai 200230, ChinaKey Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, ChinaSecond Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, ChinaState Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China<p>The drastic decline of Arctic sea ice due to global warming and polar amplification of environmental changes in the Arctic basin profoundly alter primary production with consequences for polar ecosystems and the carbon cycle. In this study, we use highly branched isoprenoids (HBIs), brassicasterol, dinosterol and terrestrial biomarkers (<span class="inline-formula"><i>n</i></span>-alkanes and campesterol) in surface sediments to assess sympagic and pelagic algal production with changing sea-ice conditions along a latitudinal transect from the Bering Sea to the high latitudes of the western Arctic Ocean. Suspended particulate matter (SPM) was also collected in surface waters at several stations of the Chukchi Sea to provide snapshots of phytoplankton communities under various sea-ice conditions for comparison with underlying surface sediments. Our results show that sympagic production (IP<span class="inline-formula"><sub>25</sub></span> and HBI-II) increased northward between 62 and 73<span class="inline-formula"><sup>∘</sup></span> N, with maximum values at the sea-ice edge in the Marginal Ice Zone (MIZ) between 70 and 73<span class="inline-formula"><sup>∘</sup></span> N in the southeastern Chukchi Sea and along the coast of Alaska. It was consistently low at northern high latitudes (<span class="inline-formula">>73</span><span class="inline-formula"><sup>∘</sup></span> N) under extensive summer sea-ice cover and in the Ice-Free Zone (IFZ) of the Bering Sea. Enhanced pelagic sterols and HBI-III occurred in the IFZ across the Bering Sea and in the southeastern Chukchi Sea up to 70–73<span class="inline-formula"><sup>∘</sup></span> N in MIZ conditions, which marks a shift of sympagic over pelagic production. In surface water SPM, pelagic sterols display similar patterns as chlorophyll <span class="inline-formula"><i>a</i></span>, increasing southward with higher amounts found in the Chukchi shelf, pointing to the dominance of diatom production. Higher cholesterol values were found in the mid-Chukchi Sea shelf where phytosterols were also abundant. This compound prevailed over phytosterols in sediments, compared to SPM, reflecting efficient consumption of algal material in the water column by herbivorous zooplankton.</p>https://bg.copernicus.org/articles/21/689/2024/bg-21-689-2024.pdf |
| spellingShingle | Y. Bai Y. Bai M.-A. Sicre J. Ren J. Ren V. Klein H. Jin H. Jin H. Jin J. Chen J. Chen J. Chen Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production Biogeosciences |
| title | Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production |
| title_full | Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production |
| title_fullStr | Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production |
| title_full_unstemmed | Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production |
| title_short | Latitudinal distribution of biomarkers across the western Arctic Ocean and the Bering Sea: an approach to assess sympagic and pelagic algal production |
| title_sort | latitudinal distribution of biomarkers across the western arctic ocean and the bering sea an approach to assess sympagic and pelagic algal production |
| url | https://bg.copernicus.org/articles/21/689/2024/bg-21-689-2024.pdf |
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