Articles | Volume 45, issue 2
https://doi.org/10.5194/jm-45-581-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/jm-45-581-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Aug 2026
Research article |
| 11 Aug 2026
| 11 Aug 2026
Quaternary Arctic planktonic foraminifera: morphological differentiation and taxonomic reassessment of subpolar spinose taxa
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Thomas M. Cronin
U.S. Geological Survey, Florence Bascom Geoscience Center, Reston, VA, USA
Kate Darling
Biological and Environmental Sciences, University of Stirling, Stirling FK9 4LA, UK
School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3FE, UK
Katrine Husum
Norwegian Polar Institute, Tromsø, Norway
Tamara Handl
The Swedish Museum of Natural History, Stockholm, Sweden
Brian T. Huber
Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA
Megh M. Kanvinde
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Mohammad Razmjooei
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Flor Vermassen
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Antje H. L. Voelker
Instituto Português do Mar e da Atmosfera (IPMA) Divisão de Geologia e Georecursos Marinhos Av. Doutor Alfredo Magalhães Ramalho,6 1495-165 Algés, Portugal
Centro de Ciências do Mar do Algarve (CCMAR/CIMAR LA), Universidade do Algarve, 8005-139 Faro, Portugal
Tirza M. Weitkamp
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
Matt O'Regan
Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
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Here we examine the Nares Strait sea ice dynamics over the last 7000 years and their implications for the late Holocene readvance of the floating part of Petermann Glacier. We propose that the historically observed sea ice dynamics are a relatively recent feature, while most of the mid-Holocene was marked by variable sea ice conditions in Nares Strait. Nonetheless, major advances of the Petermann ice tongue were preceded by a shift towards harsher sea ice conditions in Nares Strait.
Matt O'Regan, Thomas M. Cronin, Brendan Reilly, Aage Kristian Olsen Alstrup, Laura Gemery, Anna Golub, Larry A. Mayer, Mathieu Morlighem, Matthias Moros, Ole L. Munk, Johan Nilsson, Christof Pearce, Henrieka Detlef, Christian Stranne, Flor Vermassen, Gabriel West, and Martin Jakobsson
The Cryosphere, 15, 4073–4097, https://doi.org/10.5194/tc-15-4073-2021, https://doi.org/10.5194/tc-15-4073-2021, 2021
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Ryder Glacier is a marine-terminating glacier in north Greenland discharging ice into the Lincoln Sea. Here we use marine sediment cores to reconstruct its retreat and advance behavior through the Holocene. We show that while Sherard Osborn Fjord has a physiography conducive to glacier and ice tongue stability, Ryder still retreated more than 40 km inland from its current position by the Middle Holocene. This highlights the sensitivity of north Greenland's marine glaciers to climate change.
Cited articles
Adler, R. E., Polyak, L., Ortiz, J. D., Kaufman, D. S., Channell, J. E. T., Xuan, C., Grottoli, A. G., Sellén, E., and Crawford, K. A.: Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge, Global Planet. Change, 68, 18–29, https://doi.org/10.1016/j.gloplacha.2009.03.026, 2009.
Aksu, A. E.: Holocene and Pleistocene dissolution cycles in deep-sea cores of Baffin Bay and Davis Strait: Palaeoceanographic implications, Mar. Geol., 53, 331–348, https://doi.org/10.1016/0025-3227(83)90049-X, 1983.
Aksu, A. E.: Paleomagnetic stratigraphy of the CESAR cores, in: Initial geological report on CESAR: the Canadian expedition to study the Alpha Ridge, edited by: Jackson, H. R., Mudie, P. J., and Blasco, S. M., Arctic Ocean Geological Survey of Canada, Paper 84-22, 101–114, https://doi.org/10.4095/120315, 1985.
Alonso-Garcia, M., Sierro, F. J., and Flores, J. A.: Arctic front shifts in the subpolar North Atlantic during the Mid-Pleistocene (800–400 ka) and their implications for ocean circulation, Palaeogeogr. Palaeoclim., 311, 268–280, https://doi.org/10.1016/j.palaeo.2011.09.004, 2011.
Anglada-Ortiz, G., Rasmussen, T. L., Chierici, M., Fransson, A., Ziveri, P., Thomsen, E., Zamelczyk, K., Meilland, J., Ezat, M. M., and Garcia-Orellana, J.: Changes in Planktic Foraminiferal Distribution, Productivity, and Preservation in the Barents Sea During the Last Three Millennia, Paleoceanogr. Paleoclim., 40, e2024PA004989, https://doi.org/10.1029/2024PA004989, 2025.
Armitage, D. V., Glock, N., Weiss, T. L., Ezat, M. M., Westgård, A., Sykes, F. E., Meilland, J., de la Vega, E., Fabbrini, A., Babila, T. L., and Morley, A.: The impact of essential climate variables on respiration rates in subpolar and polar planktonic foraminifera, Biogeosciences, 23, 3655–3673, https://doi.org/10.5194/bg-23-3655-2026, 2026.
Barrientos, N.: Arctic Ocean benthic foraminifera preservation and Mg/Ca ratios: Implications for bottom water palaeothermometry, Ph.D. thesis, Stockholm University, Sweden, 165 pp., ISBN (electronic): 978-91-7797-176-4, 2018.
Bauch, H. A.: Significance of variability in Turborotalita quinqueloba (Natland) test size and abundance for paleoceanographic interpretations in the Norwegian-Greenland Sea, Mar. Geol., 121, 129–141, https://doi.org/10.1016/0025-3227(94)90162-7, 1994.
Bauch, H. A.: Paleoceanography of the North Atlantic Ocean (68°–76°N) during the past 450 ky deduced from planktic foraminiferal assemblages and stable isotopes, in: Contributions to the Micropaleontology and Paleoceanography of the Northern North Atlantic, edited by: Hass, H. C. and Kaminski, M. A., Grzybowski Foundation Special Publication, Krakow, 83–100, 1997.
Bauch, H. A., Kandiano, E. S., and Helmke, J. P.: Contrasting ocean changes between the subpolar and polar North Atlantic during the past 135 ka, Geophys. Res. Lett., 39, https://doi.org/10.1029/2012GL051800, 2012.
Bé, A. W. H. and Hamlin, W. H.: Ecology of Recent Planktonic Foraminifera: Part 3: Distribution in the North Atlantic during the Summer of 1962, Micropaleontology, 13, 87–106, 1967.
Blow, W. H. and Banner, F. T.: The mid-Tertiary (upper Eocene to Aquitanian) Globigerinacae, in: Fundamentals of mid-Tertiary stratigraphical correlation, edited by: Eames, F. E., Banner, F. T., Blow, W. H., and Clarke, W. J., Cambridge University Press, London, 61-151, ISBN: 978-0-521-17229-5, 1962.
Bown, P. R. and Young, J. R.: Techniques, in: Calcareous nannofossil biostratigraphy, edited by: Bown, P. R., Cambridge, Chapman and Hall, London, 16–28, https://doi.org/10.1007/978-94-011-4902-0_2, 1998.
Brummer, G. J. A. and Kroon, D.: Planktonic foraminifers as tracers of ocean-climate history: ontogeny, relationships and preservation of modern species and stable isotopes, phenotypes and assemblage distribution in different water masses, Free University Press, 346 pp., ISBN 90-6256-744-4, 1988.
Brummer, G.-J. A. and Kučera, M.: Taxonomic review of living planktonic foraminifera, J. Micropalaeontol., 41, 29–74, https://doi.org/10.5194/jm-41-29-2022, 2022.
Brummer, G. J. A., Hemleben, C., and Spindler, M.: Ontogeny of extant spinose planktonic foraminifera (Globigerinidae): A concept exemplified by Globigerinoides sacculifer (Brady) and G. ruber (d'Orbigny), Mar. Micropaleontol., 12, 357–381, 1987.
Bukry, D.: Coccolith and Silicoflagellate Stratigraphy, Northern Mid-Atlantic Ridge and Reykjanes Ridge, Deep Sea Drilling Project Leg 49, in: Initial Reports of the Deep Sea Drilling Project, edited by: Luyendyk, B. P., Cann, J. R., and Sharman, G. S., US Government Printing Office, 551–581, https://doi.org/10.2973/dsdp.proc.49.118.1979, 1979.
Carstens, J. and Wefer, G.: Recent distribution of planktonic foraminifera in the Nansen Basin, Arctic Ocean, Deep-Sea Res. Pt. A, 39, S507–S524, https://doi.org/10.1016/S0198-0149(06)80018-X, 1992.
Carstens, J., Hebbeln, D. and Wefer, G.: Distribution of planktic foraminifera at the ice margin in the Arctic (Fram Strait), Mar. Micropaleontol., 29, 257–269, https://doi.org/10.1016/S0377-8398(96)00014-X, 1997.
Cifelli, R. and Smith, R. K.: Distribution of planktonic Foraminifera in the vicinity of the North Atlantic Current, Smithsonian Contributions to Paleobiology, 4, 359–866, 1970.
Clark, D. L.: Magnetic reversals and sedimentation rates in the Arctic Basin, Geol. Soc. Am. Bull., 81, 3129–3134, https://doi.org/10.1130/0016-7606(1970)81[3129:MRASRI]2.0.CO;2, 1970.
Clotten, C., Stein, R., Fahl, K., and De Schepper, S.: Seasonal sea ice cover during the warm Pliocene: Evidence from the Iceland Sea (ODP Site 907), Earth Planet. Sc. Lett., 481, 61–72, https://doi.org/10.1016/j.epsl.2017.10.011, 2018.
Cronin, T. M., Smith, S. A., Eynaud, F., O'Regan, M., and King, J.: Quaternary paleoceanography of the central Arctic based on Integrated Ocean Drilling Program Arctic Coring Expedition 302 foraminiferal assemblages, Paleoceanography, 23, https://doi.org/10.1029/2007PA001484, 2008.
Cronin, T. M., Polyak, L., Reed, D., Kandiano, E. S., Marzen, R. E., and Council, E. A.: A 600-ka Arctic sea-ice record from Mendeleev Ridge based on ostracodes, Quaternary Sci. Rev., 79, 157–167, https://doi.org/10.1016/j.quascirev.2012.12.010, 2013.
Cronin, T. M., DeNinno, L. H., Polyak, L., Caverly, E. K., Poore, R. Z., Brenner, A., Rodriguez-Lazaro, J., and Marzen, R. E.: Quaternary ostracode and foraminiferal biostratigraphy and paleoceanography in the western Arctic Ocean, Mar. Micropaleontol., 111, 118–133, https://doi.org/10.1016/j.marmicro.2014.05.001, 2014.
Cronin, T. M., Keller, K. J., Farmer, J. R., Schaller, M. F., O'Regan, M., Poirier, R., Coxall, H., Dwyer, G. S., Bauch, H. Kindstedt, I. G., Jakobsson, M., Marzen, R., and Santin, E.: Interglacial Paleoclimate in the Arctic, Paleoceanogr. Paleoclim., 34, 1959–1979, https://doi.org/10.1029/2019PA003708, 2019.
Darling, F. K., Kucera, M., Pudsey, C. J., and Wade, C. M.: Molecular evidence links cryptic diversification in polar planktonic protists to Quaternary climate dynamics, P. Natl. Acad. Sci. USA, 101, 7657–7662, https://doi.org/10.1073/pnas.0402401101, 2004.
Darling, K. F. and Wade, C. M.: The genetic diversity of planktic foraminifera and the global distribution of ribosomal RNA genotypes, Mar. Micropaleontol., 67, 216–238, https://doi.org/10.1016/j.marmicro.2008.01.009, 2008.
Darling, K. F., Kucera, M., Kroon, D., and Wade, C. M.: A resolution for the coiling direction paradox in Neogloboquadrina pachyderma, Paleoceanography, 21, 1–14, 2006.
Darling, K. F., Kucera, M., and Wade, C. M.: Global molecular phylogeography reveals persistent Arctic circumpolar isolation in a marine planktonic protist, P. Natl. Acad. Sci. USA, 104, https://doi.org/10.1073/pnas.0700520104, 2007.
Darling, K. F., Wade, C. M., Siccha, M., Trommer, G., Schulz, H., Abdolalipour, S., and Kurasawa, A.: Genetic diversity and ecology of the planktonic foraminifers Globigerina bulloides, Turborotalita quinqueloba and Neogloboquadrina pachyderma off the Oman margin during the late SW Monsoon, Mar. Micropaleontol., 137, 64–77, https://doi.org/10.1016/j.marmicro.2017.10.006, 2017.
Davis, C. V., Livsey, C. M., Palmer, H. M., Hull, P. M., Thomas, E., Hill, T. M., and Benitez-Nelson, C. R.: Extensive morphological variability in asexually produced planktic foraminifera, Sci. Adv., 6, eabb8930, https://doi.org/10.1126/sciadv.abb8930, 2020.
Ding, X., Wang, R., Zhang, H., and Tao, Z.: Distribution, ecology, and oxygen and carbon isotope characteristics of modern planktonic foraminifers in the Makarov Basin of the Arctic Ocean, Chinese Sci. Bull., 59, 674–687, https://doi.org/10.1007/s11434-013-0082-8, 2014.
El Bani Altuna, N., Pieńkowski, A. J., Eynaud, F., and Thiessen, R.: The morphotypes of Neogloboquadrina pachyderma: Isotopic signature and distribution patterns in the Canadian Arctic Archipelago and adjacent regions, Mar. Micropaleontol., 142, 13–24, https://doi.org/10.1016/j.marmicro.2018.05.004, 2018.
Eynaud, F.: Planktonic foraminifera in the Arctic: potentials and issues regarding modern and quaternary populations, IOP Conference Series: Earth and Environmental Science, 14, 012005, https://doi.org/10.1088/1755-1315/14/1/012005, 2011.
Eynaud, F., Cronin, T. M., Smith, S. A., Zaragosi, S., Mavel, J., Mary, Y., Mas, V., and Pujol, C.: Morphological variability of the planktonic foraminifer Neogloboquadrina pachyderma from ACEX cores: Implications for Late Pleistocene circulation in the Arctic Ocean, Micropaleontology, 55, The Arctic Coring Expedition (IODP 302): Micropaleontology at the North Pole, 101–116, https://doi.org/10.47894/mpal.55.2.02, 2009.
Ezard, T. H., Pearson, P. N., and Purvis, A.: Algorithmic approaches to aid species' delimitation in multidimensional morphospace, BMC Evol. Biol., 10, 175, https://doi.org/10.1186/1471-2148-10-175, 2010.
Fabbrini, A., Greco, M., Iacoviello, F., Kucera, M., Ezard, T. H. G., and Wade, B. S.: Bridging the extant and fossil record of planktonic foraminifera: implications for the Globigerina lineage, Palaeontology, 66, e12676, https://doi.org/10.1111/pala.12676, 2023.
Falzoni, F., Petrizzo, M. R., Huber, B. T., and MacLeod, K. G.: Insights into the meridional ornamentation of the planktonic foraminiferal genus Rugoglobigerina (Late Cretaceous) and implications for taxonomy, Cretaceous Res., 47, 87–104, https://doi.org/10.1016/j.cretres.2013.11.001, 2014.
Greco, M., Jonkers, L., Kretschmer, K., Bijma, J., and Kucera, M.: Depth habitat of the planktonic foraminifera Neogloboquadrina pachyderma in the northern high latitudes explained by sea-ice and chlorophyll concentrations, Biogeosciences, 16, 3425–3437, https://doi.org/10.5194/bg-16-3425-2019, 2019.
Greco, M., Morard, R., and Kucera, M.: Single-cell metabarcoding reveals biotic interactions of the Arctic calcifier Neogloboquadrina pachyderma with the eukaryotic pelagic community, J. Plankton Res., 43, 113–125, https://doi.org/10.1093/plankt/fbab015, 2021.
Greco, M., Werner, K., Zamelczyk, K., Rasmussen, T. L., and Kucera, M.: Decadal trend of plankton community change and habitat shoaling in the Arctic gateway recorded by planktonic foraminifera, Glob. Change Biol., 28, 1798–1808, https://doi.org/10.1111/gcb.16037, 2022.
Hanslik, D.: Late Quaternary biostratigraphy and paleoceanography of the central Arctic Ocean, Ph.D. Thesis, Stockholm University, Sweden, ISBN 978-91-7447-311-7, 2011.
Hanslik, D., Löwemark, L. and Jakobsson, M.: Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning, Polar Res., 32, 18386, https://doi.org/10.3402/polar.v32i0.18386, 2013.
Hemleben, C., Spindler, M., and Anderson, O. R.: Modern planktonic foraminifera, Springer-Verlag, New York, 363 pp., ISBN 3-540-96815-6, 1989.
Hemleben, C. H., Olsson, R. K., Premec Fucek, V., and Hernández Fernández, M.: Wall textures of Oligocene normal perforate planktonic foraminifera, in: Atlas of Oligocene Planktonic Foraminifera, edited by: Wade, B., Olsson, R. K., Pearson, P. N., Huber, B. T., and Berggren, W. A., Cushman Foundation Special Publication, Washington D.C., 46, 55–78, ISBN (electronic volume): 978-1-970168-41-9, 2018.
Herman, Y.: Temperature water planktonic foraminifer in Quaternary sediments of the Arctic Ocean, Nature, 201, 386–387, 1964.
Herman, Y.: Arctic Paleo-Oceanography in Late Cenozoic Time, Science, 169, 474, https://doi.org/10.1126/science.169.3944.474, 1970.
Herman, Y.: Arctic Ocean sediments, microfauna, and the climatic record in late Cenozoic time, in: Marine geology and oceanography of the Arctic seas, edited by: Herman, Y., Springer, Berlin, 283–348, ISBN (Volume): 3-540-06628-4, 1974.
Herman, Y.: Globigerina exumbilicata Herman, 1974, a Synonym of G. quinqueloba egelida Cifelli and Smith, 1970, J. Paleontol., 54, 631, 1980.
Herman, Y.: Baffin Bay: present-day analog of the central Arctic during late Pliocene to mid-Pleistocene time, Geology, 11, 356–359, https://doi.org/10.1130/0091-7613(1983)11<356:BBPAOT>2.0.CO;2, 1983.
Herman, Y. and Hopkins, D. M.: Arctic Oceanic Climate in Late Cenozoic Time, Science, 209, 557, https://doi.org/10.1126/science.209.4456.557, 1980.
Herman, Y. and O'Neil, J. R.: Arctic palaeosalinities during late Cainozoic time, Nature, 258, 591–595, https://doi.org/10.1038/258591a0, 1975.
Hillaire-Marcel, C., Ghaleb, B., de Vernal, A., Maccali, J., Cuny, K., Jacobel, A., Le Duc, C., and McManus, J.: A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231Pa and 230Th, Geochem. Geophy., Geosy., 18, 4573–4585, https://doi.org/10.1002/2017GC007050, 2017.
Huber, R., Meggers, H., Baumann, K.-H., Raymo, M. E., and Henrich, R.: Shell size variation of the planktonic foraminifer Neogloboquadrina pachyderma sin. in the Norwegian–Greenland Sea during the last 1.3 Myrs: implications for paleoceanographic reconstructions, Palaeogeogr, Palaeoclim., 160, 193–212, https://doi.org/10.1016/S0031-0182(00)00066-3, 2000.
Husum, K. and Hald, M.: Arctic planktic foraminiferal assemblages: Implications for subsurface temperature reconstructions, Mar. Micropaleontol., 99, 8–17, https://doi.org/10.1016/j.marmicro.2013.03.012, 2012.
ICZN (International Code of Zoological Nomenclature): International Code of Zoological Nomenclature, Fourth Edition, The Natural History Museum London, London, 306 pp., ISBN 0-85301-006-4, 2012.
Jakobsson, M., Løvlie, R., Arnold, E. M., Backman, J., Polyak, L., Knutsen, J. O., and Musatov, E.: Pleistocene stratigraphy and paleoenvironmental variation from Lomonosov Ridge sediments, central Arctic Ocean, Global Planet. Change, 31, 1–22, https://doi.org/10.1016/S0921-8181(01)00110-2, 2001.
Jakobsson, M., Mayer, L. A., Bringensparr, C., Castro, C. F., Mohammad, R., Johnson, P., Ketter, T., Accettella, D., Amblas, D., An, L., Arndt, J. E., Canals, M., Casamor, J. L., Chauché, N., Coakley, B., Danielson, S., Demarte, M., Dickson, M.-L., Dorschel, B., Dowdeswell, J. A., Dreutter, S., Fremand, A. C., Gallant, D., Hall, J. K., Hehemann, L., Hodnesdal, H., Hong, J., Ivaldi, R., Kane, E., Klaucke, I., Krawczyk, D. W., Kristoffersen, Y., Kuipers, B. R., Millan, R., Masetti, G., Morlighem, M., Noormets, R., Prescott, M. M., Rebesco, M., Rignot, E., Semiletov, I., Tate, A. J., Travaglini, P., Velicogna, I., Weatherall, P., Weinrebe, W., Willis, J. K., Wood, M., Zarayskaya, Y., Zhang, T., Zimmermann, M., and Zinglersen, K. B.: The International Bathymetric Chart of the Arctic Ocean Version 4.0, Sci. Data, 7, 176, https://doi.org/10.1038/s41597-020-0520-9, 2020.
Jang, K., Bayon, G., Han, Y., Joe, Y. J., Jun, S.-Y., Son, Y. J., Matthiessen, J., O’Regan, M., Vogt, C., Stein, R., Sakamoto, T., Byun, E., Woo, K. S., and Nam, S.-I.: The potential role of Arctic seaway expansion in driving the Mid-Pleistocene Transition, Commun. Earth Environ., 7, 449, doi.org/10.1038/s43247-026-03570-4, 2026.
Jansen, E., Fronval, T., Rack, F., and Channell, J. E. T.: Pliocene-Pleistocene ice rafting history and cyclicity in the Nordic Seas during the last 3.5 Myr, Paleoceanography, 15, 709–721, https://doi.org/10.1029/1999PA000435, 2000.
Jennings, A. E., Andrews, J. T., Ó Cofaigh, C., St-Onge, G., Belt, S., Cabedo-Sanz, P., Pearce, C., Hillaire-Marcel, and Calvin Campbell, D.: Baffin Bay paleoenvironments in the LGM and HS1: Resolving the ice-shelf question, Mar. Geol., 402, 5–16, https://doi.org/10.1016/j.margeo.2017.09.002, 2018.
Jensen, S.: Planktonforaminiferen im Europäischen Nordmeer: Verbreitung und Vertikalfluß sowie ihre Entwicklung während der letzten 15 000 Jahre, Berichte aus dem Sonderforschungsbereich, Ph.D. thesis, University Kiel, Germany, 105 pp., https://doi.org/10.2312/reports-sfb313.1998.75, 1998.
Johannessen, T., Jansen, E., Flatøy, A., and Ravelo, A.-C.: The Relationship between Surface Water Masses, Oceanographic Fronts and Paleoclimatic Proxies in Surface Sediments of the Greenland, Iceland, Norwegian Seas, in: Carbon Cycling in the Glacial Ocean: Constraints on the Ocean's Role in Global Change, edited by: Zahn, R., Pedersen, T. F., Kaminski, M. A., and Labeyrie, L., Springer Berlin Heidelberg, Berlin, Heidelberg, 61–85, ISBN 978-3-540-57594-8, 1994.
Jonkers, L., Brummer, G.-J. A., Peeters, F. J. C., van Aken, H. M., and De Jong, M. F.: Seasonal stratification, shell flux, and oxygen isotope dynamics of left-coiling N. pachyderma and T. quinqueloba in the western subpolar North Atlantic, Paleoceanography, 25, https://doi.org/10.1029/2009PA001849, 2010.
Keany, J. and Kennett, J. P.: Pliocene-early Pleistocene paleoclimatic history recorded in Antarctic-Subantarctic deep-sea cores, Deep-Sea Res., 19, 529–548, https://doi.org/10.1016/0011-7471(72)90038-1, 1972.
Keating-Bitonti, C. R. and Payne, J. L.: Environmental influence on growth history in marine benthic foraminifera, Paleobiology, 44, 736–757, https://doi.org/10.1017/pab.2018.19, 2018.
Kennett, J. P. and Srinivasan, M. S.: Neogene planktonic foraminifera: a phylogenetic atlas, Hutchinson Ross, Stroudsburg, Penn., 265 pp., ISBN 978-0879330705, 1983.
Knies, J., O'Regan, M., and Marcel, C. H.: Finding consensus on Arctic Ocean climate history, EOS T. Am. Geophys. Un., 106, https://doi.org/10.1029/2025EO250230, 2025.
Knutz, P. C., Jennings, A. E., Childress, L. B., and Scientists, E. (Eds.): NW Greenland Glaciated Margin. International Ocean Discovery Program, College Station, TX, https://doi.org/10.14379/iodp.proc.400.2025, 2025.
Kucera, M. and Darling, K. F.: 2002: Cryptic species of planktonic foraminifera: their effect on palaeoceanographic reconstructions, P. Trans. R. Soc. Lond. A, 360, https://doi.org/10.1098/rsta.2001.0962, 2002.
Lisiecki, L. E. and Raymo, M. E.: A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records, Paleoceanography, 20, PA1003, https://doi.org/10.1029/2004PA001071, 2005.
Löwemark, L., März, C., O'Regan, M., and Gyllencreutz, R.: Arctic Ocean Mn-stratigraphy: Genesis, synthesis and inter-basin correlation, Quaternary Sci. Rev., 92, 97–111, https://doi.org/10.1016/j.quascirev.2013.11.018, 2014.
Malmgren, B. A., Berggren, W. A., and Lohmann, G. P.: Evidence for punctuated gradualism in the Late Neogene Globorotalia tumida lineage of planktonic foraminifera, Paleobiology, 9, 377–389, https://doi.org/10.1017/S0094837300007843, 1983.
Martinelli, P., Cacho, I., Cavallero, E., Cascella, A., Di Bella, L., Lirer, F., Selvaggi, M., and Gennari, R.: Increase the magnification, they are shrinking! Morphometric variations of the planktic foraminifera Globigerina bulloides in response to environmental changes over the last 27.4 ka in the Ligurian Sea, Mar. Micropaleontol., 203, 102552, https://doi.org/10.1016/j.marmicro.2026.102552, 2026.
Martini, E.: Calcareous Nannoplankton and Silicoflagellate Biostratigraphy at Reykjanes Ridge, Northeastern North Atlantic (DSDP Leg 49, Sites 407 and 409), in: Initial Reports of the Deep Sea Drilling Project, edited by: Luyendyk, B. P., Cann, J. R., and Sharman, G. S., US Government Printing Office, 49, 533–549, https://doi.org/10.2973/dsdp.proc.49.117.1979, 1979.
Matthiessen, J., Schreck, M., De Schepper, S., Zorzi, C., and de Vernal, A.: Quaternary dinoflagellate cysts in the Arctic Ocean: Potential and limitations for stratigraphy and paleoenvironmental reconstructions, Quaternary Sci. Rev., 192, 1–26, https://doi.org/10.1016/j.quascirev.2017.12.020, 2018.
Meilland, J., Howa, H., Hulot, V., Demangel, I., Salaün, J., and Garlan, T.: Population dynamics of modern planktonic foraminifera in the western Barents Sea, Biogeosciences, 17, 1437–1450, https://doi.org/10.5194/bg-17-1437-2020, 2020.
Meilland, J., Ezat, M. M., Westgård, A., Manno, C., Morard, R., Siccha, M., and Kucera, M.: Rare but persistent asexual reproduction explains the success of planktonic foraminifera in polar oceans, J. Plankton Res., 45, 15–32, https://doi.org/10.1093/plankt/fbac069, 2023.
Meilland, J., Siccha, M., Morard, R., and Kucera, M.: Continuous reproduction of planktonic foraminifera in laboratory culture, J. Eukaryot. Microbiol., e13022, https://doi.org/10.1111/jeu.13022, 2024.
Moffa-Sánchez, P., Hall, I. R., Barker, S., Thornalley, D. J. R., and Yashayaev, I.: Surface changes in the eastern Labrador Sea around the onset of the Little Ice Age, Paleoceanography, 29, 160–175, https://doi.org/10.1002/2013PA002523, 2014.
Mokeddem, Z., McManus, J. F., and Oppo, D. W.: Oceanographic dynamics and the end of the last interglacial in the subpolar North Atlantic, P. Natl. Acad. Sci. USA, 111, 11263–11268, https://doi.org/10.1073/pnas.1322103111, 2014.
Morard, R., Darling, K. F., Mahé, F., Audic, S., Ujiié, Y., Weiner, A. K., André, A., Seears, H. A., Wade, C. M., Quillévéré, F., Douady, C. J., Escarguel, G., de Garidel-Thoron, T., Siccha, M., Kucera, M., and de Vargas, C.: PFR2: a curated database of planktonic foraminifera 18S ribosomal DNA as a resource for studies of plankton ecology, biogeography and evolution, Mol. Ecol. Resour., 15, 1472–1485, https://doi.org/10.1111/1755-0998.12410, 2015.
Morard, R., Darling, K. F., Weiner, A. K. M., Hassenrück, C., Vanni, C., Cordier, T., Henry, N., Greco, M., Vollmar, N. M., Milivojevic, T., Rahman, S. N., Siccha, M., Meilland, J., Jonkers, L., Quillévéré, F., Escarguel, G., Douady, C. J., de Garidel, Thoron, T., de Vargas, C., and Kucera, M.: The global genetic diversity of planktonic foraminifera reveals the structure of cryptic speciation in plankton, Biol. Rev., 99, 1218–1241, https://doi.org/10.1111/brv.13065, 2024.
Natland, M. L.: New Species of foraminifera from off the west coast of North America and from the later Tertiary of the Los Angeles Basin, Bulletin of the Scripps Institution of Oceanography of the University of California La Jolla, California, Technical Series, 4, 137–164, 1938.
Norris, R. D., Wilson, P. A., Blum, P., and Scientists, E.: Proc. IODP, 342, http://https://doi.org/10.2204/iodp.proc.342.106.2014, 2014.
Nørgaard-Pedersen, N., Mikkelsen, N., Lassen, S. J., Kristoffersen, Y. and Sheldon, E.: Reduced sea ice concentrations in the Arctic Ocean during the last interglacial period revealed by sediment cores off northern Greenland, Paleoceanography, 22, PA1218, https://doi.org/10.1029/2006PA001283, 2007.
Ogg, J. G.: Geomagnetic Polarity Time Scale, in: Geologic Time Scale 2020, edited by: Gradstein, F. M., Ogg, J. G., Schmitz, M. D., and Ogg, G. M., Elsevier, 159–192, https://doi.org/10.1016/B978-0-12-824360-2.00005-X, 2020.
Olsson, R. K., Hemleben, C., Huber, B. T., and Berggren, W. A.: Taxonomy, biostratigraphy and phylogeny of Globigerina, Globoturborotalita, Subbotina, and Turborotalita, in: Atlas of Eocene planktonic foraminifera, Cushman Foundation of Foraminiferal Research, Special Publication no. 41, edited by: Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T., and Berggren, W. A., Allen Press, Lawrence, Kansas, 111–168, ISBN (electronic): 9781970168365, 2006.
O'Regan, M., King, J., Backman, J., Jakobsson, M., Pälike, H., Moran, K., Heil, C. Sakamoto, T. Cronin, T. M., and Jordan, R. W.: Constraints on the Pleistocene chronology of sediments from the Lomonosov Ridge, Paleoceanography, 23, PA1S19, https://doi.org/10.1029/2007PA001551, 2008.
O'Regan, M., Backman, J., Fornaciari, E., Jakobsson, M., and West, G.: Calcareous nannofossils anchor chronologies for Arctic Ocean sediments back to 500 ka, Geology, 48, 1115–1119, https://doi.org/10.1130/G47479.1, 2020.
O'Regan, M., Coxall, H. K., Cronin, T. M., Gyllencreutz, R., Jakobsson, M., Kaboth, S., Löwemark, L., Wiers, S., Löwemark, and West, G.: Stratigraphic Occurrences of Sub-Polar Planktic Foraminifera in Pleistocene Sediments on the Lomonosov Ridge, Arctic Ocean, Front. Earth Sci., 7, https://doi.org/10.3389/feart.2019.00071, 2019.
O'Regan, M., Jakobsson, M., and Moran, K.: Did the central Arctic become a sediment-starved basin in the Quaternary?, Mar. Geol., 494, 107729, https://doi.org/10.1016/j.margeo.2026.107729, 2026.
Parker, F. L.: Planktonic Foraminiferal Species in Pacific Sediments, Micropaleontology, 8, 219–254, 1962.
Pearson, P. N.: A lineage phylogeny for the Paleogene planktonic foraminifera, Micropaleontology, 39, 193–232, 1993.
Pearson, P. N. and Ezard, T. H. G.: Evolution and speciation in the Eocene planktonic foraminifer Turborotalia, Paleobiology, 40, 130–143, https://doi.org/10.1666/13004, 2014.
Pearson, P. N. and Kucera, M.: Taxonomy, biostratigraphy, and phylogeny of Oligocene Turborotalita, in: Atlas of Oligocene Planktonic Foraminifera, edited by: Wade, B., Olsson, R. K., Pearson, P. N., Huber, B. T., and Berggren, W. A., Cushman Foundation Special Publication, Washington D.C., 46, 385–392, 2018.
Perch-Nielsen, K.: Mesozoic calcareous nannofossils, in: Plankton stratigraphy, Cambridge University Press, edited by: Bolli, H. M., Saunders, J. B., and Perch-Nielsen, K., Cambridge University Press, UK, 329–426, ISBN 978-0521367196, 1985.
Polyak, L., Curry, W. B., Darby, D. A., Bischof, J., and Cronin, T. M.: Contrasting glacial/interglacial regimes in the western Arctic Ocean as exemplified by a sedimentary record from the Mendeleev Ridge. Palaeogeography, Palaeoclimatology, Palaeoecology, 203, 73–93, https://doi.org/10.1016/S0031-0182(03)00661-8, 2004.
Polyak, L., Alley, R. B., Andrews, J. T., Brigham-Gretted, J., Cronin, T. M., Darby, D. A., Dyke, A. S., Fitzpatrick, J. J., Funder, S., Holland, M. M., Jennings, A. E., Miller, G. H. , O'Regan, M., Savellel, J., Serreze, M., St. John, K., James, W. C., and Whitec, E. W.: History of sea ice in the Arctic, Quaternary Sci. Rev., 29, 1757–1778, 2010.
Polyak, L., Best, K. M., Crawford, K. A., Council, E. A., and St-Onge, G.: Quaternary history of sea ice in the western Arctic Ocean based on foraminifera, Quaternary Sci. Rev., 79, 145–156, https://doi.org/10.1016/j.quascirev.2012.12.018, 2013.
Poore, R. Z.: Oligocene through quaternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP Leg 49, in: Initial Reports of the Deep Sea Drilling Project, edited by: Luyendyk, B. P., Cann, J. R., and Sharman, G. S., US Government Printing Office, 49, 447–571, https://doi.org/10.2973/dsdp.proc.49.115.1979, 1979.
Raffi, I., Backman, J., Fornaciari, E., Pälike, H., Rio, D., Lourens, L., and Hilgen, F.: A review of calcareous nannofossil astrobiochronology encompassing the past 25 million years, Quaternary Sci. Rev., 25, 3113–3137, https://doi.org/10.1016/j.quascirev.2006.07.007, 2006.
Razmjooei, M. J., Henderiks, J., Coxall, H. K., Baumann, K.-H., Vermassen, F., Jakobsson, M., Niessen, F., and O'Regan, M.: Revision of the Quaternary calcareous nannofossil biochronology of Arctic Ocean sediments, Q. Sci. Rev., 321, 108382, https://doi.org/10.1016/j.quascirev.2023.108382, 2023.
Saito, T. (Ed.): Micropaleontology, petrography and lithostratigraphy of Cenozoic rocks of the Yogyakarta region, Central Java, Dept of Earth Sciences, Yamagata University, 1981.
Schiebel, R. and Hemleben, C.: Planktic Foraminifera in the Modern Ocean, Springer, 358 pp., https://doi.org/10.1007/978-3-662-50297-6, 2017.
Schindler, J. F.: The impact of ice island-the story of Arlis II and Fletcher's Ice-Island, T-3, since 1962, in: Arctic Drifting Stations, edited by: Sater, J. E., Arctic Institute of North America, 49–78, 1968.
Schmidt, D. N., Renaud, S., and Bollmann, J.: Response of planktic foraminiferal size to late Quaternary climate change, Paleoceanography, 18, 12 pp., 2003.
Schneider, C. A., Rasband, W. S., and Eliceiri, K. W.: NIH Image to ImageJ: 25 years of image analysis, Nat. Meth., 9, 671–675, https://doi.org/10.1038/nmeth.2089, 2012.
Shipboard Scientific Party: Site 907, in: Proceedings of the ODP, Initial Reports 151, edited by: Myhre, A. M., Thiede, J., Firth, J. V., et al., 57–111, Ocean Drilling Program, College Station, TX, https://doi.org/10.2973/odp.proc.ir.151.105.1995, 1995.
Simstich, J., Sarnthein, M., and Erlenkeuser, H.: Paired δ18O signals of Neogloboquadrina pachyderma (s) and Turborotalita quinqueloba show thermal stratification structure in Nordic Seas, Mar. Micropaleontol., 48, 107–125, https://doi.org/10.1016/S0377-8398(02)00165-2, 2003.
Snoeijs-Leijonmalm, P. and the SAS-Oden 2021 Scientific Party: Expedition Report SWEDARCTIC: Synoptic Arctic Survey 2021 with icebreaker Oden, 300, ISBN (electronic): 978-91-519-3672-7, 2022.
Spezzaferri, S., Coxall, H. K., Olsson, R. K., and Hemleben, C. H.: Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen., in: Atlas of Oligocene Planktonic Foraminifera, edited by: Wade, B., Olsson, R. K., Pearson, P. N., Huber, B. T., and Berggren, W. A., Cushman Foundation Special Publication, Washington D.C., 46, 179–214, 2018.
Spiegler, D.: Planktonic foraminifer Cenozoic biostratigraphy of the Arctic Ocean, Fram Strait (Sites 908-909), Yermak Plateau (sites 910-912), and East Greenland Margin (Site 931), in: Proceedings of the Ocean Drilling Program, Scientific Results, edited by: Thiede, J., Myhre, A. M., Firth, J. V., Johnson, G. L., and Ruddiman, W. F., Ocean Drilling Program, College Station, TX, 151, 153–167, https://doi.org/10.2973/odp.proc.sr.151.104.1996, 1996.
Stangeew, E.: Distribution and isotopic composition of living planktonic foraminifera N. pachyderma (sinistral) and T. quinqueloba in the high latitude North Atlantic, Ph.D. dissertation, Christian-Albrechts-Univ., Kiel, Germany, 2001.
Stehman, C. F.: Planktonic foraminifera in Baffin Bay, Davis Strait and the Labrador Sea, Maritime Sediments, 8, 13–19, 1972.
Stehman, C. F. and Gregory, M.: A preliminary account of benthonic and planktonic foraminifera in Baffin Bay, Davis Strait and the Labrador Sea, in Earth science symposium on offshore eastern Canada, Geological Survey of Canada Paper, 71–23, 499–507, 1973.
Steinmetz, J. C.: Calcareous Nannofossils from the North Atlantic Ocean, Leg 49, Deep Sea Drilling Project, in: Initial Reports of the Deep Sea Drilling Project, edited by: Luyendyk, B. P., Cann, J. R., and Sharman, G. S., US Government Printing Office, 49, 519–531, https://doi.org/10.2973/dsdp.proc.49.116.1979, 1979.
Tabachnick, R. E. and Bookstein, F. L.: The structure of individual variation in Miocene Globorotalia, Evolution, 44, 416–434, https://doi.org/10.1111/j.1558-5646.1990.tb05209.x, 1990.
Takagi, H., Kimoto, K., Fujiki, T., Saito, H., Schmidt, C., Kucera, M., and Moriya, K.: Characterizing photosymbiosis in modern planktonic foraminifera, Biogeosciences, 16, 3377–3396, https://doi.org/10.5194/bg-16-3377-2019, 2019.
Tesi, T., Muschitiello, F., Mollenhauer, G., Miserocchi, S., Langone, L., Ceccarelli, C., Panieri, G., Chiggiato, J., Nogarotto, A., Hefter, J., Ingrosso, G., Giglio, F., Giordano, P., and Capotondi, L.: Rapid Atlantification along the Fram Strait at the beginning of the 20th century, Sci. Adv., 7, eabj2946, https://doi.org/10.1126/sciadv.abj2946, 2021.
Todd, C. L., Schmidt, D. N., Robinson, M. M., and De Schepper, S.: Planktic Foraminiferal Test Size and Weight Response to the Late Pliocene Environment, Paleoceanogr. Paleoclim., 35, e2019PA003738, https://doi.org/10.1029/2019PA003738, 2020.
Vermassen, F., O'Regan, M., West, G., Cronin, T. M., and Coxall, H. K.: Testing the stratigraphic consistency of Pleistocene microfossil bioevents identified on the Alpha and Lomonosov Ridges, Arctic Ocean, Arct. Antarct. Alp. Res., 53, 309–323, https://doi.org/10.1080/15230430.2021.1988356, 2021.
Vermassen, F., O'Regan, M., de Boer, A., Schenk, F., Razmjooei, M., West, G., Cronin, T. M., Jakobsson, M., and Coxall, H. K.: A seasonally ice-free Arctic Ocean during the Last Interglacial, Nat. Geosci., 16, 723–729, https://doi.org/10.1038/s41561-023-01227-x, 2023.
Vermassen, F., Bird, C., Weitkamp, T. M., Darling, K. F., Farnelid, H., Heuzé, C., Hsiang, A. Y., Karam, S., Stranne, C., Sundbom, M., and Coxall, H. K.: The distribution and abundance of planktonic foraminifera under summer sea ice in the Arctic Ocean, Biogeosciences, 22, 2261–2286, https://doi.org/10.5194/bg-22-2261-2025, 2025.
Volkmann, R.: Planktic foraminifers in the outer Laptev Sea and the Fram Strait – Modern distribution and ecology, J. Foramin. Res., 30, 157–176, https://doi.org/10.2113/0300157, 2000.
Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T., and Berggren, W. A.: Atlas of Oligocene Planktonic Foraminifera, Cushman Foundation Special Publication No. 46, Cushman Foundation Special Publication, Washington D.C., 528 pp., 2018.
Wang, R., Polyak, L., Xiao, W., Wu, L., Zhang, T., Sun, Y., and Xu, X.: Late-Middle Quaternary lithostratigraphy and sedimentation patterns on the Alpha Ridge, central Arctic Ocean: Implications for Arctic climate variability on orbital time scales, Quaternary Sci. Rev., 181, 93–108, https://doi.org/10.1016/j.quascirev.2017.12.006, 2018.
Wang, R., Polyak, L., Zhang, W., Yu, X., Ye, L., Dong, L., Liu, Y., Wang, W. and Diekmann, B.: Glacial-interglacial sedimentation and paleocirculation at the Northwind Ridge, western Arctic Ocean, Quaternary Sci. Rev., 258, https://doi.org/10.1016/j.quascirev.2021.106882, 2021.
Weitkamp, T. M., Bird, C., Darling, K. F., Hsiang, A. Y., Ramsay, J., Vermassen, F., and Coxall, H. K.: Aberrant coiling signatures reveal the specialised reproductive strategy of the planktonic foraminifera Neogloboquadrina pachyderma under Central Arctic perennial sea ice, Mar. Micropaleontol., 102503, https://doi.org/10.1016/j.marmicro.2025.102503, 2025a.
Weitkamp, T. M., Razmjooei, M. J., Pearson, P. N., and Coxall, H. K.: Upper Oligocene to Pleistocene planktonic foraminifera stratigraphy at North Atlantic DSDP Site 407, Reykjanes Ridge: diversity trends and biozonation using modern Neogene taxonomic concepts, J. Micropalaeontol., 44, 1–78, https://doi.org/10.5194/jm-44-1-2025, 2025b.
Werner, K., Spielhagen, R. F., Bauch, D., Hass, H. C., Kandiano, E., and Zamelczyk, K.: Atlantic Water advection to the eastern Fram Strait – Multiproxy evidence for late Holocene variability, Palaeogeogr. Palaeoclim., 308, 264–276, https://doi.org/10.1016/j.palaeo.2011.05.030, 2011.
West, G., Kaufman, D. S., Jakobsson, M., and O'Regan, M.: Amino acid racemization in Neogloboquadrina pachyderma and Cibicidoides wuellerstorfi from the Arctic Ocean and its implications for age models, Geochronology, 5, 285–299, https://doi.org/10.5194/gchron-5-285-2023, 2023.
Xiao, W., Polyak, L., Wang, R., Löwemark, L., Mei, J., You, D., Wang, W., Wu, L., and Jin, X.: Middle to Late Pleistocene Arctic paleoceanographic changes based on sedimentary records from Mendeleev Ridge and Makarov Basin, Quaternary Sci. Rev., 228, https://doi.org/10.1016/j.quascirev.2019.106105, 2020.
Young, J. R.: Neogene, in: Calcareous Nannofossil Biostratigraphy, edited by: Bown, P. R., British Micropalaeontological Society Publication Series, Chapman and Hall, Berlin, 225–265, ISBN: 10 0412789701, 1998.
Young, J. R., Bown, P. R., and Lees, J. A.: Nannotax3 website, International Nannoplankton Association, https://www.mikrotax.org/Nannotax3 (last access: 2 February 2026), 2022.
Zamelczyk, K., Rasmussen, T. L., Raitzsch, M., and Chierici, M.: Planktic foraminifera and structure of surface water masses at the SW Svalbard margin in relation to climate changes during the last 2000 years, Clim. Past Discuss. [preprint], https://doi.org/10.5194/cp-2018-93, 2018.
Zamelczyk, K., Fransson, A., Chierici, M., Jones, E., Meilland, J., Anglada-Ortiz, G., and Lødemel, H. H.: Distribution and Abundances of Planktic Foraminifera and Shelled Pteropods During the Polar Night in the Sea-Ice Covered Northern Barents Sea, Front. Mar. Sci., 8, https://doi.org/10.3389/fmars.2021.644094, 2021.
Zhuravleva, A., Bauch, H. A., and Spielhagen, R. F.: Atlantic water heat transfer through the Arctic Gateway (Fram Strait) during the Last Interglacial, Global and Planetary Change, 157, 232–243, https://doi.org/10.1016/j.gloplacha.2017.09.005, 2017.
Short summary
Today’s sea-ice-covered Arctic Ocean hosts only one species of calcifying planktonic foraminifera, unlike warmer oceans with diverse communities. Fossils show that other species once inhabited the Arctic, but their identities and environmental significance remain uncertain. Using detailed microscopy and hundreds of shell measurements, we resolve these fossil species and establish a new taxonomic framework providing the foundation for improved reconstructions of Quaternary Arctic climate history.
Today’s sea-ice-covered Arctic Ocean hosts only one species of calcifying planktonic...
