Abstract
Two sediment cores, one from the Siberian Laptev Sea shelf and another from the central Arctic Ocean were investigated with respect to the temporal distribution of planktic foraminifera as well as the species composition.
The assemblage in the Laptev Sea, which cover the time back to about 2.3 ka, is mainly comprised of species that can be related to a subtropical-subpolar biogeography and is dominated by the minute species Turborotalita clarkei. The origin of the non-polar species on the Siberian shelf remains unknown. It is suggested that these microfossils were either reworked from older sediments and/or entrained into sea-ice on other shallow Arctic shelfs, transporting them eventually to the Laptev Sea.
In contrast to the Laptev Sea the glacial and Holocene sediments from the perennially ice- covered central Arctic Ocean reveal a typical monospecific record, which is entirely made up of the polar species Neogloboquadrina pachyderma (right and left coiling forms). The relative variability of the two coiling varieties is of the order of 5%. Although this variability does not seem to be related to climate-induced environmental changes, total test concentration shows a clear signal of increasing deposition of foraminiferal tests after 7 ka. Since sea-ice and surface water conditions seem to be stable in this region, the observed increase in plankton productivity during the Holocene must be linked to changes in water mass circulation.
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Bauch, H.A. (1999). Planktic Foraminifera in Holocene Sediments from the Laptev Sea and the Central Arctic Ocean: Species Distribution and Paleobiogeographical Implication. In: Kassens, H., et al. Land-Ocean Systems in the Siberian Arctic. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60134-7_46
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DOI: https://doi.org/10.1007/978-3-642-60134-7_46
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