Cristin-resultat-ID: 1587981
Sist endret: 18. januar 2019 15:35
Resultat
Vitenskapelig foredrag
2018

Late Quaternary sea ice reconstructions in the Greenland Sea using sedimentary ancient DNA

Bidragsytere:
  • Jessica Louise Ray
  • Stijn De Schepper
  • Jørund Raukleiv Strømsøe
  • Henrik Sadatzki
  • Katrine Sandnes Skaar
  • Aud Larsen
  • mfl.

Gjesteforelesning

Tittel: SAMS Internal Seminar

Sted:

Scottish Association for Marine Science, Oban, Argyll, UK
Storbritannia
Utbredelsesområde: Internasjonalt
Årstall: 2018
Dato fra: 22. mai 2018
Dato til: 23. mai 2018

Arrangør:

Thomas Brown

Om resultatet

Vitenskapelig foredrag
Publiseringsår: 2018
Invitert

Finansiering

  • Norges forskningsråd
    Prosjektkode: 268062
  • Norges forskningsråd
    Prosjektkode: 268489/O30

Beskrivelse Beskrivelse

Tittel

Late Quaternary sea ice reconstructions in the Greenland Sea using sedimentary ancient DNA

Sammendrag

Arctic sea ice is declining fast, heralding a change that will affect local communities and ecosystems, as well as local and global economy and politics. To predict future Arctic climate, climate models require input from, or need to be tested against, observations of past sea ice cover. Satellite and historical records only go back to the 1970s or around 1850, respectively, but beyond that we crucially lack tools that can quantitatively assess past Arctic sea ice variability. Sedimentary ancient DNA (sedaDNA) as a palaeoceanographic proxy is still in its infancy and its potential is not yet fully explored. However, emerging multidisciplinary studies suggest that, through its geochemical link with biological diversity, sedaDNA can become a valuable tool to deepen our understanding of palaeoceanography and sea ice history. We investigated a sediment core from the Greenland Sea for sedaDNA, dinoflagellate cysts and the sea ice biomarker IP25. Metabarcoding analysis using universal eukaryotic primers targeting the V7 hypervariable region of the small subunit ribosomal RNA gene (SSU) revealed a rich but distinct diversity in the eight sediment samples analyzed, representing the recent past and as far back as approximately 100 ka. The sedaDNA sample dated to ~34 ka was unique in the study interval with nearly-absent diatoms and a dominance of dinoflagellates, cercozoans and unclassified sequences. The same sample also yielded the sea-ice-associated dinoflagellate cyst Islandinium, the organic biomarker IP25 and high relative abundance of the sea-ice-associated dinoflagellate Polarella glacialis, all indicative of seasonal sea ice cover in this sample. Our goal is to fully develop the potential of sedaDNA to identify open ocean, seasonal sea ice or permanent sea ice environments, as well as to develop tools to quantify sea ice parameters in the geological record.

Bidragsytere

Jessica Louise Ray

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap ved Universitetet i Bergen

Stijn De Schepper

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen
Aktiv cristin-person

Jørund Raukleiv Strømsøe

  • Tilknyttet:
    Forfatter
    ved NORCE Klima ved NORCE Norwegian Research Centre AS

Henrik Sadatzki

  • Tilknyttet:
    Forfatter
    ved Institutt for geovitenskap ved Universitetet i Bergen

Katrine Sandnes Skaar

  • Tilknyttet:
    Forfatter
    ved NORCE Miljø ved NORCE Norwegian Research Centre AS
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