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A 24,000-year ancient DNA and pollen record from the Polar Urals reveals temporal dynamics of arctic and boreal plant communities

A 24,000-year ancient DNA and pollen record from the Polar Urals reveals temporal dynamics of arctic and boreal plant communities
A 24,000-year ancient DNA and pollen record from the Polar Urals reveals temporal dynamics of arctic and boreal plant communities

A 24,000-year record of plant community dynamics, based on pollen and ancient DNA from the sediments (sedaDNA) of Lake Bolshoye Shchuchye in the Polar Ural Mountains, provides detailed information on the flora of the Last Glacial Maximum (LGM) and also changes in plant community composition and dominance. It greatly improves on incomplete records from short and fragmented stratigraphic sequences found in exposed sedimentary sections in the western Russian Arctic. In total, 162 plant taxa were detected by sedaDNA and 115 by pollen analysis. Several shifts in dominance between and within plant functional groups occurred over the studied period, but most taxa appear to have survived in situ. A diverse arctic-alpine herb flora characterised the interval ca. 24,000–17,000 cal years BP and persisted into the Holocene. Around 17,000 cal years BP, sedges (e.g. Carex) and bryophytes (e.g. Bryum, Aulacomnium) increased. The establishment of shrub-tundra communities of Dryas and Vaccinium sp., with potentially some Betula pubescens trees (influx ∼290 grains cm2 year−1), followed at ca. 15,000 cal years BP. Forest taxa such as Picea and ferns (e.g. Dryopteris fragrans, Gymnocarpium dryopteris) established near the lake from ca. 10,000 cal years BP, followed by the establishment of Larix trees from ca. 9000 cal years BP. Picea began to decline from ca. 7000 cal years BP. A complete withdrawal of forest tree taxa occurred by ca. 4000 cal years BP, presumably due to decreasing growing-season temperatures, allowing the expansion of dwarf-shrub tundra and a diverse herb community similar to the present-day vegetation mosaic. Contrary to some earlier comparative studies, sedaDNA and pollen from Lake Bolshoye Shchuchye showed high similarity in the timing of compositional changes and the occurrence of key plant taxa. The sedaDNA record revealed several features that the pollen stratigraphy and earlier palaeorecords in the region failed to detect; a sustained, long-term increase in floristic richness since the LGM until the early Holocene, turnover in grass and forb genera over the Pleistocene-Holocene transition, persistence of a diverse arctic-alpine flora over the late Quaternary, and a variable bryophyte flora through time. As pollen records are often limited by taxonomic resolution, differential productivity and dispersal, sedaDNA can provide improved estimates of floristic richness and is better able to distinguish between different plant assemblages. However, pollen remains superior at providing quantitative estimates of plant abundance changes and detecting several diverse groups (e.g. Poaceae, Cyperaceae, Asteraceae) which may be underreported in the sedaDNA. Joint use of the two proxies provided unprecedented floristic detail of past plant communities and helped to distinguish between long-distance transport of pollen and local presence, particularly for woody plant taxa.

Arctic Russia, Late Pleistocene, Plant community changes, Polar Ural Mountains, Pollen, Sedimentary ancient DNA (sedaDNA)
0277-3791
Clarke, Charlotte L.
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Alsos, Inger Greve
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Edwards, Mary E.
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Paus, Aage
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Gielly, Ludovic
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Haflidason, Haflidi
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Mangerud, Jan
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Regnéll, Carl
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Hughes, Paul D.M.
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Svendsen, John Inge
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Bjune, Anne E.
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Clarke, Charlotte L.
68afb5e9-7966-4b54-9549-47c49e350f6c
Alsos, Inger Greve
88244b90-b66f-4271-9064-db0544dec568
Edwards, Mary E.
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Paus, Aage
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Gielly, Ludovic
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Haflidason, Haflidi
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Mangerud, Jan
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Regnéll, Carl
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Hughes, Paul D.M.
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Svendsen, John Inge
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Bjune, Anne E.
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Clarke, Charlotte L., Alsos, Inger Greve, Edwards, Mary E., Paus, Aage, Gielly, Ludovic, Haflidason, Haflidi, Mangerud, Jan, Regnéll, Carl, Hughes, Paul D.M., Svendsen, John Inge and Bjune, Anne E. (2020) A 24,000-year ancient DNA and pollen record from the Polar Urals reveals temporal dynamics of arctic and boreal plant communities. Quaternary Science Reviews, 247, [106564]. (doi:10.1016/j.quascirev.2020.106564).

Record type: Article

Abstract

A 24,000-year record of plant community dynamics, based on pollen and ancient DNA from the sediments (sedaDNA) of Lake Bolshoye Shchuchye in the Polar Ural Mountains, provides detailed information on the flora of the Last Glacial Maximum (LGM) and also changes in plant community composition and dominance. It greatly improves on incomplete records from short and fragmented stratigraphic sequences found in exposed sedimentary sections in the western Russian Arctic. In total, 162 plant taxa were detected by sedaDNA and 115 by pollen analysis. Several shifts in dominance between and within plant functional groups occurred over the studied period, but most taxa appear to have survived in situ. A diverse arctic-alpine herb flora characterised the interval ca. 24,000–17,000 cal years BP and persisted into the Holocene. Around 17,000 cal years BP, sedges (e.g. Carex) and bryophytes (e.g. Bryum, Aulacomnium) increased. The establishment of shrub-tundra communities of Dryas and Vaccinium sp., with potentially some Betula pubescens trees (influx ∼290 grains cm2 year−1), followed at ca. 15,000 cal years BP. Forest taxa such as Picea and ferns (e.g. Dryopteris fragrans, Gymnocarpium dryopteris) established near the lake from ca. 10,000 cal years BP, followed by the establishment of Larix trees from ca. 9000 cal years BP. Picea began to decline from ca. 7000 cal years BP. A complete withdrawal of forest tree taxa occurred by ca. 4000 cal years BP, presumably due to decreasing growing-season temperatures, allowing the expansion of dwarf-shrub tundra and a diverse herb community similar to the present-day vegetation mosaic. Contrary to some earlier comparative studies, sedaDNA and pollen from Lake Bolshoye Shchuchye showed high similarity in the timing of compositional changes and the occurrence of key plant taxa. The sedaDNA record revealed several features that the pollen stratigraphy and earlier palaeorecords in the region failed to detect; a sustained, long-term increase in floristic richness since the LGM until the early Holocene, turnover in grass and forb genera over the Pleistocene-Holocene transition, persistence of a diverse arctic-alpine flora over the late Quaternary, and a variable bryophyte flora through time. As pollen records are often limited by taxonomic resolution, differential productivity and dispersal, sedaDNA can provide improved estimates of floristic richness and is better able to distinguish between different plant assemblages. However, pollen remains superior at providing quantitative estimates of plant abundance changes and detecting several diverse groups (e.g. Poaceae, Cyperaceae, Asteraceae) which may be underreported in the sedaDNA. Joint use of the two proxies provided unprecedented floristic detail of past plant communities and helped to distinguish between long-distance transport of pollen and local presence, particularly for woody plant taxa.

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More information

Published date: 1 November 2020
Additional Information: Funding Information: This study was jointly supported by the Norwegian Research Council through the multinational research projects ?Climate History along the Arctic Seaboard of Eurasia (CHASE)? (grant. no. NRC 255415 to John Inge Svendsen), ?AfterIce? (grant no. 213692/F20 and 230617/E10 to Inger Greve Alsos), ?ECOGEN: Ecosystem change and species persistence over time? (grant no. 250963/F20 to Inger Greve Alsos) and a PhD studentship for Charlotte L. Clarke provided by the UK Natural Environment Research Council (grant no. NE/L002531/1). We thank Marie Kristine F?reid Merkel, Anita-Elin Fed?y and Linn Cecilie Kr?ger for assistance during laboratory work. We also offer our sincere thanks to two anonymous reviewers for their time and constructive feedback on the manuscript. Funding Information: This study was jointly supported by the Norwegian Research Council through the multinational research projects “Climate History along the Arctic Seaboard of Eurasia (CHASE)” (grant. no. NRC 255415 to John Inge Svendsen), “ AfterIce ” (grant no. 213692/F20 and 230617/E10 to Inger Greve Alsos), “ ECOGEN: Ecosystem change and species persistence over time ” (grant no. 250963/F20 to Inger Greve Alsos) and a PhD studentship for Charlotte L. Clarke provided by the UK Natural Environment Research Council (grant no. NE/L002531/1 ). We thank Marie Kristine Føreid Merkel, Anita-Elin Fedøy and Linn Cecilie Krüger for assistance during laboratory work. We also offer our sincere thanks to two anonymous reviewers for their time and constructive feedback on the manuscript. Publisher Copyright: © 2020 The Author(s) Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
Keywords: Arctic Russia, Late Pleistocene, Plant community changes, Polar Ural Mountains, Pollen, Sedimentary ancient DNA (sedaDNA)

Identifiers

Local EPrints ID: 448198
URI: http://eprints.soton.ac.uk/id/eprint/448198
ISSN: 0277-3791
PURE UUID: 2d8c054f-06d0-4f7a-9a15-e6c3996d8e99
ORCID for Mary E. Edwards: ORCID iD orcid.org/0000-0002-3490-6682
ORCID for Paul D.M. Hughes: ORCID iD orcid.org/0000-0002-8447-382X

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Date deposited: 14 Apr 2021 16:42
Last modified: 28 Apr 2022 01:50

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Contributors

Author: Charlotte L. Clarke
Author: Inger Greve Alsos
Author: Mary E. Edwards ORCID iD
Author: Aage Paus
Author: Ludovic Gielly
Author: Haflidi Haflidason
Author: Jan Mangerud
Author: Carl Regnéll
Author: John Inge Svendsen
Author: Anne E. Bjune

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