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Bauch, Dorothea; Darling, Kate F; Simstich, Johannes; Bauch, Henning A; Erlenkeuser, Helmut; Kroon, Dick (2010): Investigation of N. pachyderma from the North Atlantic. PANGAEA,, Supplement to: Bauch, D et al. (2003): Palaeoceanographic implications of genetic variation in living North Atlantic Neogloboquadrina pachyderma. Nature, 424(6946), 299-303,

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The shells of the planktonic foraminifer Neogloboquadrina pachyderma have become a classical tool for reconstructing glacial-interglacial climate conditions in the North Atlantic Ocean. Palaeoceanographers utilize its left- and right-coiling variants, which exhibit a distinctive reciprocal temperature and water mass related shift in faunal abundance both at present and in late Quaternary sediments. Recently discovered cryptic genetic diversity in planktonic foraminifers now poses significant questions for these studies. Here we report genetic evidence demonstrating that the apparent 'single species' shell-based records of right-coiling N. pachyderma used in palaeoceanographic reconstructions contain an alternation in species as environmental factors change. This is reflected in a species-dependent incremental shift in right-coiling N. pachyderma shell calcite d18O between the Last Glacial Maximum and full Holocene conditions. Guided by the percentage dextral coiling ratio, our findings enhance the use of d18O records of right-coiling N. pachyderma for future study. They also highlight the need to genetically investigate other important morphospecies to refine their accuracy and reliability as palaeoceanographic proxies.
Related to:
Simstich, Johannes (1999): Die ozeanische Deckschicht des Europäischen Nordmeers im Abbild stabiler Isotope von Kalkgehäusen unterschiedlicher Planktonforaminiferenarten. (Variations in the oceanic surface layer of the Nordic Seas: the stable-isotope record of polar and subpolar planctonic foraminifera). Berichte-Reports, Institut für Geowissenschaften, Universität Kiel, 2, 96 pp,
Median Latitude: 68.442968 * Median Longitude: -2.555179 * South-bound Latitude: 51.566667 * West-bound Longitude: -31.072000 * North-bound Latitude: 80.452300 * East-bound Longitude: 16.401699
Date/Time Start: 1983-05-08T00:00:00 * Date/Time End: 1996-08-13T16:45:00
BS88/6_4 * Latitude: 67.365000 * Longitude: -31.072000
BS88/6_8 * Latitude: 66.452000 * Longitude: -29.683000
BS88/6_10B * Latitude: 66.197000 * Longitude: -30.655000
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