Blar i forfatter "De Schepper, Stijn"

Viser treff 1-6 av 6

    • The dinoflagellate cyst genera Achomosphaera Evitt 1963 and Spiniferites Mantell 1850 in Pliocene to modern sediments: a summary of round table discussions 

      Mertens, Kenneth Neil; Van Nieuwenhove, Nicolas; Gurdebeke, Pieter R; Aydin, Hilal; Bogus, Kara; Bringué, Manuel; Dale, Barrie; De Schepper, Stijn; de Vernal, Anne; Ellegaard, Marianne; Grothe, Arjen; Gu, Haifeng; Head, Martin J.; Heikillä, Maija; Limoges, Audrey; Londeix, Laurent; Louwye, Stephen; Marret, Fabienne; Masure, Edwige; Matsuoka, Kazumi; Mudie, Peta J.; Penaud, Aurélie; Pospelova, Vera; Price, Andrea Michelle; Ribeiro, Sofia; Rochon, André; Sangiorgi, Francesca; Schreck, Michael; Torres, Vladimir; Uzar, Serdar; Versteegh, Gerard J M; Warny, Sophie; Zonneveld, Karin (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-14)
      We present a summary of two round-table discussions held during two subsequent workshops in Montreal (Canada) on 16 April 2014 and Ostend (Belgium) on 8 July 2015. Five species of the genus <i>Achomosphaera</i> Evitt 1963 and 33 of the genus <i>Spiniferites</i> Mantell 1850 emend. Sarjeant 1970 occuring in Pliocene to modern sediments are listed and briefly described along with remarks made by ...

    • Millennial-scale variations in Arctic sea ice are recorded in sedimentary ancient DNA of the microalga Polarella glacialis 

      Harðardóttir, Sara; Haile, James S.; Ray, Jessica Louise; Limoges, Audrey; Van Nieuwenhove, Nicolas; Lalande, Catherine; Grondin, Pierre-Luc; Jackson, Rebecca; Skaar, Katrine Sandnes; Heikkilä, Maija; Berge, Jørgen; Lundholm, Nina; Massé, Guillaume; Rysgaard, Søren; Seidenkrantz, Marit-Solveig; De Schepper, Stijn; Lorenzen, Eline D.; Lovejoy, Connie; Ribeiro, Sofia (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-09)
      Sea ice is a critical component of the Earth’s Climate System and a unique habitat. Sea-ice changes prior to the satellite era are poorly documented, and proxy methods are needed to constrain its past variability. Here, we demonstrate the potential of sedimentary DNA from Polarella glacialis, a sea-ice microalga, for tracing past sea-ice conditions. We quantified P. glacialis DNA (targeting the ...

    • Neogene dinoflagellate cysts and acritarchs from the high northern latitudes and their relation to sea surface temperature 

      Schreck, Michael; Nam, Seung-Il; Clotten, Caroline; Fahl, Kirsten; De Schepper, Stijn; Forwick, Matthias; Matthiessen, Jens (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-13)
      <p>Organic-walled dinoflagellate cysts and acritarchs are a vital tool for reconstructing past environmental change, in particular in the Neogene of the high northern latitudes where marine deposits are virtually barren of traditionally used calcareous microfossils. Yet only little is known about the paleoenvironmental value of fossil assemblages that do not have modern analogues, so that reconstructions ...

    • On the causes of Arctic sea ice in the warm Early Pliocene 

      Clotten, Caroline; Stein, Rüdiger; Fahl, Kirsten; Schreck, Michael; Risebrobakken, Bjørg; De Schepper, Stijn (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-30)
      Scattered and indirect evidence suggests that sea ice occurred as far south as the Iceland Sea during the Early Pliocene, when the global climate was warmer than present. However, conclusive evidence as well as potential mechanisms governing sea ice occurrence outside the Arctic Ocean during a time with elevated greenhouse gas concentrations are still elusive. Here we present a suite of organic ...

    • Sea ice variability from the penultimate glacial to the last interglacial in the Eastern Fram Strait 

      Steinsland, Kristine; Grant, Danielle M.; Fahl, Kirsten; Stein, Ruediger; Rasmussen, Tine Lander; Risebrobakken, Bjørg; Ninnemann, Ulysses S; Knies, Jochen Manfred; Velle, Julie Heggdal; De Schepper, Stijn (Journal article; Tidsskriftartikkel; Peer reviewed, 2025-01-28)
      The ongoing reduction of Arctic sea ice underscores the need to understand the drivers behind sea ice variability and associated ocean-climate impacts. The Last Interglacial, Marine Isotope (sub)Stage (MIS) 5e, and its transitions offer insights into sea ice variability during a period warmer than pre-industrial, and intervals of large climatic changes. This study examines a marine sediment core ...

    • Sedimentary ancient DNA: a new paleogenomic tool for reconstructing the history of marine ecosystems 

      Nguyen, Ngoc-Loi; Devendra, Dhanushka; Szymanska, Natalia; Greco, Mattia; Barrenechea Angeles, Inés Andrea; Weiner, Agnes K. M.; Ray, Jessica Louise; Cordier, Tristan; De Schepper, Stijn; Pawłowski, Jan; Pawłowska, Joanna (Journal article; Tidsskriftartikkel, 2023-06-09)
      Sedimentary ancient DNA (sedaDNA) offers a novel retrospective approach to reconstructing the history of marine ecosystems over geological timescales. Until now, the biological proxies used to reconstruct paleoceanographic and paleoecological conditions were limited to organisms whose remains are preserved in the fossil record. The development of ancient DNA analysis techniques substantially expands ...