Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic)
This study is based on multiproxy data gained from a 14 C-dated 6.5 m long sediment core and a 210 Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during th...
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/bg-20-1691-2023 https://doaj.org/article/59370ea4ffe640629ed3592b13dcfdd0 |
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ftdoajarticles:oai:doaj.org/article:59370ea4ffe640629ed3592b13dcfdd0 2023-06-11T04:09:05+02:00 Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) B. K. Biskaborn A. Forster G. Pfalz L. A. Pestryakova K. Stoof-Leichsenring J. Strauss T. Kröger U. Herzschuh 2023-05-01T00:00:00Z https://doi.org/10.5194/bg-20-1691-2023 https://doaj.org/article/59370ea4ffe640629ed3592b13dcfdd0 EN eng Copernicus Publications https://bg.copernicus.org/articles/20/1691/2023/bg-20-1691-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-1691-2023 1726-4170 1726-4189 https://doaj.org/article/59370ea4ffe640629ed3592b13dcfdd0 Biogeosciences, Vol 20, Pp 1691-1712 (2023) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/bg-20-1691-2023 2023-05-07T00:33:00Z This study is based on multiproxy data gained from a 14 C-dated 6.5 m long sediment core and a 210 Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during the last 29 kyr and to investigate the main drivers behind bioproduction shifts. The methods comprise age-modeling, accumulation rate estimation, and light microscope diatom species analysis of 74 samples, as well as organic carbon, nitrogen, and mercury analysis. Diatoms have appeared in the lake since 21.8 ka cal BP and are dominated by planktonic Lindavia ocellata and L. cyclopuncta . Around the Pleistocene–Holocene boundary, other taxa including planktonic Aulacoseira , benthic fragilarioid ( Staurosira ), and achnanthoid species increase in their abundance. There is strong correlation between variations of diatom valve accumulation rates (DARs; mean 176.1×10 9 valves m 2 a 1 ), organic carbon accumulation rates (OCARs; mean 4.6 g m −2 a −1 ), and mercury accumulation rates (HgARs; mean 63.4 µ g m −2 a −1 ). We discuss the environmental forcings behind shifts in diatom species and find moderate responses of key taxa to the cold glacial period, postglacial warming, the Younger Dryas, and the Holocene Thermal Maximum. The short-core data likely suggest recent change of the diatom community at the beginning of the 20th century related to human-induced warming but only little evidence of atmospheric deposition of contaminants. Significant correlation between DAR and OCAR in the Holocene interglacial indicates within-lake bioproduction represents bulk organic carbon deposited in the lake sediment. During both glacial and interglacial episodes HgAR is mainly bound to organic matter in the lake associated with biochemical substrate conditions. There were only ambiguous signs of increased HgAR during the industrialization period. We conclude that if increased short-term emissions are neglected, pristine Arctic lake systems ... Article in Journal/Newspaper Arctic Chukotka Directory of Open Access Journals: DOAJ Articles Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Biogeosciences 20 9 1691 1712 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 B. K. Biskaborn A. Forster G. Pfalz L. A. Pestryakova K. Stoof-Leichsenring J. Strauss T. Kröger U. Herzschuh Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
This study is based on multiproxy data gained from a 14 C-dated 6.5 m long sediment core and a 210 Pb-dated 23 cm short core retrieved from Lake Rauchuagytgyn in Chukotka, Arctic Russia. Our main objectives are to reconstruct the environmental history and ecological development of the lake during the last 29 kyr and to investigate the main drivers behind bioproduction shifts. The methods comprise age-modeling, accumulation rate estimation, and light microscope diatom species analysis of 74 samples, as well as organic carbon, nitrogen, and mercury analysis. Diatoms have appeared in the lake since 21.8 ka cal BP and are dominated by planktonic Lindavia ocellata and L. cyclopuncta . Around the Pleistocene–Holocene boundary, other taxa including planktonic Aulacoseira , benthic fragilarioid ( Staurosira ), and achnanthoid species increase in their abundance. There is strong correlation between variations of diatom valve accumulation rates (DARs; mean 176.1×10 9 valves m 2 a 1 ), organic carbon accumulation rates (OCARs; mean 4.6 g m −2 a −1 ), and mercury accumulation rates (HgARs; mean 63.4 µ g m −2 a −1 ). We discuss the environmental forcings behind shifts in diatom species and find moderate responses of key taxa to the cold glacial period, postglacial warming, the Younger Dryas, and the Holocene Thermal Maximum. The short-core data likely suggest recent change of the diatom community at the beginning of the 20th century related to human-induced warming but only little evidence of atmospheric deposition of contaminants. Significant correlation between DAR and OCAR in the Holocene interglacial indicates within-lake bioproduction represents bulk organic carbon deposited in the lake sediment. During both glacial and interglacial episodes HgAR is mainly bound to organic matter in the lake associated with biochemical substrate conditions. There were only ambiguous signs of increased HgAR during the industrialization period. We conclude that if increased short-term emissions are neglected, pristine Arctic lake systems ... |
format |
Article in Journal/Newspaper |
author |
B. K. Biskaborn A. Forster G. Pfalz L. A. Pestryakova K. Stoof-Leichsenring J. Strauss T. Kröger U. Herzschuh |
author_facet |
B. K. Biskaborn A. Forster G. Pfalz L. A. Pestryakova K. Stoof-Leichsenring J. Strauss T. Kröger U. Herzschuh |
author_sort |
B. K. Biskaborn |
title |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_short |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_full |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_fullStr |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_full_unstemmed |
Diatom responses and geochemical feedbacks to environmental changes at Lake Rauchuagytgyn (Far East Russian Arctic) |
title_sort |
diatom responses and geochemical feedbacks to environmental changes at lake rauchuagytgyn (far east russian arctic) |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/bg-20-1691-2023 https://doaj.org/article/59370ea4ffe640629ed3592b13dcfdd0 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic Chukotka |
genre_facet |
Arctic Chukotka |
op_source |
Biogeosciences, Vol 20, Pp 1691-1712 (2023) |
op_relation |
https://bg.copernicus.org/articles/20/1691/2023/bg-20-1691-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-1691-2023 1726-4170 1726-4189 https://doaj.org/article/59370ea4ffe640629ed3592b13dcfdd0 |
op_doi |
https://doi.org/10.5194/bg-20-1691-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
9 |
container_start_page |
1691 |
op_container_end_page |
1712 |
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1768382798697070592 |