Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition
Recent Arctic studies suggest that sea ice decline and permafrost thawing will affect phytoplankton dynamics and stimulate heterotrophic communities. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we investigate the chemical signature of the p...
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2017
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ftdoajarticles:oai:doaj.org/article:d2559894bbc74743bab29c3aa04adef2 2023-05-15T15:16:04+02:00 Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition T. Tesi M. C. Geibel C. Pearce E. Panova J. E. Vonk E. Karlsson J. A. Salvado M. Kruså L. Bröder C. Humborg I. Semiletov Ö. Gustafsson 2017-09-01T00:00:00Z https://doi.org/10.5194/os-13-735-2017 https://doaj.org/article/d2559894bbc74743bab29c3aa04adef2 EN eng Copernicus Publications https://www.ocean-sci.net/13/735/2017/os-13-735-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-13-735-2017 1812-0784 1812-0792 https://doaj.org/article/d2559894bbc74743bab29c3aa04adef2 Ocean Science, Vol 13, Pp 735-748 (2017) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/os-13-735-2017 2022-12-31T14:10:28Z Recent Arctic studies suggest that sea ice decline and permafrost thawing will affect phytoplankton dynamics and stimulate heterotrophic communities. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we investigate the chemical signature of the plankton-dominated fraction of particulate organic matter (POM) collected along the Siberian Shelf. POM (> 10 µm) samples were analysed using molecular biomarkers (CuO oxidation and IP 25 ) and dual-carbon isotopes ( δ 13 C and Δ 14 C). In addition, surface water chemical properties were integrated with the POM (> 10 µm) dataset to understand the link between plankton composition and environmental conditions. δ 13 C and Δ 14 C exhibited a large variability in the POM (> 10 µm) distribution while the content of terrestrial biomarkers in the POM was negligible. In the Laptev Sea (LS), δ 13 C and Δ 14 C of POM (> 10 µm) suggested a heterotrophic environment in which dissolved organic carbon (DOC) from the Lena River was the primary source of metabolisable carbon. Within the Lena plume, terrestrial DOC probably became part of the food web via bacteria uptake and subsequently transferred to relatively other heterotrophic communities (e.g. dinoflagellates). Moving eastwards toward the sea-ice-dominated East Siberian Sea (ESS), the system became progressively more autotrophic. Comparison between δ 13 C of POM (> 10 µm) samples and CO 2 aq concentrations revealed that the carbon isotope fractionation increased moving towards the easternmost and most productive stations. In a warming scenario characterised by enhanced terrestrial DOC release (thawing permafrost) and progressive sea ice decline, heterotrophic conditions might persist in the LS while the nutrient-rich Pacific inflow will likely stimulate greater primary productivity in the ESS. The contrasting trophic conditions will result in a sharp gradient in δ 13 C between the LS and ESS, similar to what is documented in our semi-synoptic study. Article in Journal/Newspaper Arctic East Siberian Sea Ice laptev Laptev Sea lena river permafrost Phytoplankton Sea ice Directory of Open Access Journals: DOAJ Articles Arctic East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Laptev Sea Pacific Ocean Science 13 5 735 748 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 T. Tesi M. C. Geibel C. Pearce E. Panova J. E. Vonk E. Karlsson J. A. Salvado M. Kruså L. Bröder C. Humborg I. Semiletov Ö. Gustafsson Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
Recent Arctic studies suggest that sea ice decline and permafrost thawing will affect phytoplankton dynamics and stimulate heterotrophic communities. However, in what way the plankton composition will change as the warming proceeds remains elusive. Here we investigate the chemical signature of the plankton-dominated fraction of particulate organic matter (POM) collected along the Siberian Shelf. POM (> 10 µm) samples were analysed using molecular biomarkers (CuO oxidation and IP 25 ) and dual-carbon isotopes ( δ 13 C and Δ 14 C). In addition, surface water chemical properties were integrated with the POM (> 10 µm) dataset to understand the link between plankton composition and environmental conditions. δ 13 C and Δ 14 C exhibited a large variability in the POM (> 10 µm) distribution while the content of terrestrial biomarkers in the POM was negligible. In the Laptev Sea (LS), δ 13 C and Δ 14 C of POM (> 10 µm) suggested a heterotrophic environment in which dissolved organic carbon (DOC) from the Lena River was the primary source of metabolisable carbon. Within the Lena plume, terrestrial DOC probably became part of the food web via bacteria uptake and subsequently transferred to relatively other heterotrophic communities (e.g. dinoflagellates). Moving eastwards toward the sea-ice-dominated East Siberian Sea (ESS), the system became progressively more autotrophic. Comparison between δ 13 C of POM (> 10 µm) samples and CO 2 aq concentrations revealed that the carbon isotope fractionation increased moving towards the easternmost and most productive stations. In a warming scenario characterised by enhanced terrestrial DOC release (thawing permafrost) and progressive sea ice decline, heterotrophic conditions might persist in the LS while the nutrient-rich Pacific inflow will likely stimulate greater primary productivity in the ESS. The contrasting trophic conditions will result in a sharp gradient in δ 13 C between the LS and ESS, similar to what is documented in our semi-synoptic study. |
format |
Article in Journal/Newspaper |
author |
T. Tesi M. C. Geibel C. Pearce E. Panova J. E. Vonk E. Karlsson J. A. Salvado M. Kruså L. Bröder C. Humborg I. Semiletov Ö. Gustafsson |
author_facet |
T. Tesi M. C. Geibel C. Pearce E. Panova J. E. Vonk E. Karlsson J. A. Salvado M. Kruså L. Bröder C. Humborg I. Semiletov Ö. Gustafsson |
author_sort |
T. Tesi |
title |
Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
title_short |
Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
title_full |
Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
title_fullStr |
Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
title_full_unstemmed |
Carbon geochemistry of plankton-dominated samples in the Laptev and East Siberian shelves: contrasts in suspended particle composition |
title_sort |
carbon geochemistry of plankton-dominated samples in the laptev and east siberian shelves: contrasts in suspended particle composition |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/os-13-735-2017 https://doaj.org/article/d2559894bbc74743bab29c3aa04adef2 |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) |
geographic |
Arctic East Siberian Sea Laptev Sea Pacific |
geographic_facet |
Arctic East Siberian Sea Laptev Sea Pacific |
genre |
Arctic East Siberian Sea Ice laptev Laptev Sea lena river permafrost Phytoplankton Sea ice |
genre_facet |
Arctic East Siberian Sea Ice laptev Laptev Sea lena river permafrost Phytoplankton Sea ice |
op_source |
Ocean Science, Vol 13, Pp 735-748 (2017) |
op_relation |
https://www.ocean-sci.net/13/735/2017/os-13-735-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-13-735-2017 1812-0784 1812-0792 https://doaj.org/article/d2559894bbc74743bab29c3aa04adef2 |
op_doi |
https://doi.org/10.5194/os-13-735-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
5 |
container_start_page |
735 |
op_container_end_page |
748 |
_version_ |
1766346385066557440 |