Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic
Lakes cover large parts of the climatically sensitive Arctic landscape and respond rapidly to environmental change. Arctic lakes have different origins and include the predominant thermokarst lakes, which are small, young and highly dynamic, as well as large, old and stable glacial lakes. Freshwater...
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ftzbmed:oai:frl.publisso.de:frl:6468491 2024-01-07T09:41:20+01:00 Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic Huang, S. Herzschuh, U. Pestryakova, L. A. Zimmermann, H. H. Davydova, P. Biskaborn, B. K. Shevtsova, I. Stoof-Leichsenring, Kathleen R. 2020 https://repository.publisso.de/resource/frl:6468491 https://doi.org/10.1007/s10933-020-00133-1 eng eng https://repository.publisso.de/resource/frl:6468491 https://doi.org/10.1007/s10933-020-00133-1 https://creativecommons.org/licenses/by/4.0/ http://lobid.org/resources/99370676569906441#!, 64(3):225-242 Sedimentary DNA Diatoms Original Paper Glacial lakes Diversity Siberian arctic Thermokarst Zeitschriftenartikel 2020 ftzbmed https://doi.org/10.1007/s10933-020-00133-1 2023-12-10T23:07:39Z Lakes cover large parts of the climatically sensitive Arctic landscape and respond rapidly to environmental change. Arctic lakes have different origins and include the predominant thermokarst lakes, which are small, young and highly dynamic, as well as large, old and stable glacial lakes. Freshwater diatoms dominate the primary producer community in these lakes and can be used to detect biotic responses to climate and environmental change. We used specific diatom metabarcoding on sedimentary DNA, combined with next-generation sequencing and diatom morphology, to assess diatom diversity in five glacial and 15 thermokarst lakes within the easternmost expanse of the Siberian treeline ecotone in Chukotka, Russia. We obtained 163 verified diatom sequence types and identified 176 diatom species morphologically. Although there were large differences in taxonomic assignment using the two approaches, they showed similar high abundances and diversity of Fragilariceae and Aulacoseiraceae. In particular, the genetic approach detected hidden within-lake variations of fragilarioids in glacial lakes and dominance of centric Aulacoseira species, whereas Lindavia ocellata was predominant using morphology. In thermokarst lakes, sequence types and valve counts also detected high diversity of Fragilariaceae, which followed the vegetation gradient along the treeline. Ordination analyses of the genetic data from glacial and thermokarst lakes suggest that concentrations of sulfate (SO₄²⁻), an indicator of the activity of sulfate-reducing microbes under anoxic conditions, and bicarbonate (HCO₃⁻), which relates to surrounding vegetation, have a significant influence on diatom community composition. For thermokarst lakes, we also identified lake depth as an important variable, but SO₄²⁻ best explains diatom diversity derived from genetic data, whereas HCO₃⁻ best explains the data from valve counts. Higher diatom diversity was detected in glacial lakes, most likely related to greater lake age and different edaphic settings, which gave ... Article in Journal/Newspaper Arctic Chukotka Thermokarst PUBLISSO Fachrepositorium Lebenswissenschaften (ZB MED) Arctic Journal of Paleolimnology 64 3 225 242 |
institution |
Open Polar |
collection |
PUBLISSO Fachrepositorium Lebenswissenschaften (ZB MED) |
op_collection_id |
ftzbmed |
language |
English |
topic |
Sedimentary DNA Diatoms Original Paper Glacial lakes Diversity Siberian arctic Thermokarst |
spellingShingle |
Sedimentary DNA Diatoms Original Paper Glacial lakes Diversity Siberian arctic Thermokarst Huang, S. Herzschuh, U. Pestryakova, L. A. Zimmermann, H. H. Davydova, P. Biskaborn, B. K. Shevtsova, I. Stoof-Leichsenring, Kathleen R. Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
topic_facet |
Sedimentary DNA Diatoms Original Paper Glacial lakes Diversity Siberian arctic Thermokarst |
description |
Lakes cover large parts of the climatically sensitive Arctic landscape and respond rapidly to environmental change. Arctic lakes have different origins and include the predominant thermokarst lakes, which are small, young and highly dynamic, as well as large, old and stable glacial lakes. Freshwater diatoms dominate the primary producer community in these lakes and can be used to detect biotic responses to climate and environmental change. We used specific diatom metabarcoding on sedimentary DNA, combined with next-generation sequencing and diatom morphology, to assess diatom diversity in five glacial and 15 thermokarst lakes within the easternmost expanse of the Siberian treeline ecotone in Chukotka, Russia. We obtained 163 verified diatom sequence types and identified 176 diatom species morphologically. Although there were large differences in taxonomic assignment using the two approaches, they showed similar high abundances and diversity of Fragilariceae and Aulacoseiraceae. In particular, the genetic approach detected hidden within-lake variations of fragilarioids in glacial lakes and dominance of centric Aulacoseira species, whereas Lindavia ocellata was predominant using morphology. In thermokarst lakes, sequence types and valve counts also detected high diversity of Fragilariaceae, which followed the vegetation gradient along the treeline. Ordination analyses of the genetic data from glacial and thermokarst lakes suggest that concentrations of sulfate (SO₄²⁻), an indicator of the activity of sulfate-reducing microbes under anoxic conditions, and bicarbonate (HCO₃⁻), which relates to surrounding vegetation, have a significant influence on diatom community composition. For thermokarst lakes, we also identified lake depth as an important variable, but SO₄²⁻ best explains diatom diversity derived from genetic data, whereas HCO₃⁻ best explains the data from valve counts. Higher diatom diversity was detected in glacial lakes, most likely related to greater lake age and different edaphic settings, which gave ... |
format |
Article in Journal/Newspaper |
author |
Huang, S. Herzschuh, U. Pestryakova, L. A. Zimmermann, H. H. Davydova, P. Biskaborn, B. K. Shevtsova, I. Stoof-Leichsenring, Kathleen R. |
author_facet |
Huang, S. Herzschuh, U. Pestryakova, L. A. Zimmermann, H. H. Davydova, P. Biskaborn, B. K. Shevtsova, I. Stoof-Leichsenring, Kathleen R. |
author_sort |
Huang, S. |
title |
Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
title_short |
Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
title_full |
Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
title_fullStr |
Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
title_full_unstemmed |
Genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the Siberian Arctic |
title_sort |
genetic and morphologic determination of diatom community composition in surface sediments from glacial and thermokarst lakes in the siberian arctic |
publishDate |
2020 |
url |
https://repository.publisso.de/resource/frl:6468491 https://doi.org/10.1007/s10933-020-00133-1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Chukotka Thermokarst |
genre_facet |
Arctic Chukotka Thermokarst |
op_source |
http://lobid.org/resources/99370676569906441#!, 64(3):225-242 |
op_relation |
https://repository.publisso.de/resource/frl:6468491 https://doi.org/10.1007/s10933-020-00133-1 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1007/s10933-020-00133-1 |
container_title |
Journal of Paleolimnology |
container_volume |
64 |
container_issue |
3 |
container_start_page |
225 |
op_container_end_page |
242 |
_version_ |
1787422138674708480 |