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Title of the item:

Sedimentary ancient DNA from Lake Skartjørna, Svalbard: Assessing the resilience of arctic flora to Holocene climate change

Title :
Sedimentary ancient DNA from Lake Skartjørna, Svalbard: Assessing the resilience of arctic flora to Holocene climate change
Authors :
Alsos, Inger Greve
Sjögren, Per Johan E.
Edwards, Mary E.
Landvik, Jon Y.
Gielly, Ludovic
Forwick, Matthias
Coissac, Eric
Brown, Antony G
Jakobsen, Leif Vidar
Merkel, Marie Kristine Føreid
Pedersen, Mikkel Winter
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Subject Terms :
metabarcoding
vegetation reconstruction
Arctic
plant macrofossils
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Vegetasjonshistorie: 495
ancient DNA
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi, glasiologi: 465
climate change
Publisher :
SAGE Publications, 2015.
Publication Year :
2015
File Description :
text
Language :
English
ISSN :
1477-0911
DOI :
10.1177/0959683615612563
Accession Number :
edsair.dedup.wf.001..7fc6d384c02af2c552b444ac374c2c20
Reconstructing past vegetation and species diversity from arctic lake sediments can be challenging because of low pollen and plant macrofossil concentrations. Information may be enhanced by metabarcoding of sedimentary ancient DNA (sedaDNA). We developed a Holocene record from Lake Skartjørna, Svalbard, using sedaDNA, plant macrofossils and sediment properties, and compared it with published records. All but two genera of vascular plants identified as macrofossils in this or a previous study were identified with sedaDNA. Six additional vascular taxa were found, plus two algal and 12 bryophyte taxa, by sedaDNA analysis, which also detected more species per sample than macrofossil analysis. A shift from Salix polaris-dominated vegetation, with Koenigia islandica, Ranunculaceae and the relatively thermophilic species Arabis alpina and Betula, to Dryas octopetala-dominated vegetation ~6600–5500 cal. BP suggests a transition from moist conditions 1–2°C warmer than today to colder/drier conditions. This coincides with a decrease in runoff, inferred from core lithology, and an independent record of declining lacustrine productivity. This mid-Holocene change in terrestrial vegetation is broadly coincident with changes in records from marine sediments off the west coast of Svalbard. Over the Holocene sedaDNA records little floristic change, and it clearly shows species persisted near the lake during time intervals when they are not detected as macrofossils. The flora has shown resilience in the presence of a changing climate, and, if future warming is limited to 2°C or less, we might expect only minor floristic changes in this region. However, the Holocene record provides no analogues for greater warming.
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