Distribution Patterns and Morphology of Islandiella norcrossi (Cushman) in the Upper Quaternary Deposits of the Laptev Sea
- Authors: Ovsepyan Y.S.1,2,3, Taldenkova E.E.4,2
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Affiliations:
- Geological Institute, Russian Academy of Sciences
- Arctic and Antarctic Research Institute
- Shirshov Institute of Oceanology, Russian Academy of Sciences
- Lomonosov Moscow State University
- Issue: Vol 53, No 1 (2019)
- Pages: 10-19
- Section: Article
- URL: https://journals.rcsi.science/0031-0301/article/view/168345
- DOI: https://doi.org/10.1134/S0031030119010064
- ID: 168345
Cite item
Abstract
The ecology and taxonomy of Islandiella norcrossi (Cushman, 1933), a typical representative of the Arctic calcareous benthic foraminifers, are analyzed based on microfossils from the Late Pleistocene-Holocene deposits of the Laptev Sea. This species is distributed on the shelf and continental slope of the Arctic seas, and indicates normal marine conditions with a seasonal ice cover and cold Arctic water masses. The species is also associated with a high seasonal productivity in sea-ice marginal zone. Tests are abundant in the Laptev Sea sediments, and show some variability in the size and shape of chambers, which was possibly caused by harsh environmental conditions of the Arctic (limited period of growth and reproduction); aberrant forms with an additional aperture being also present. The population contains tests of macrospherical and microspherical generations, as well as juveniles.
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About the authors
Ya. S. Ovsepyan
Geological Institute, Russian Academy of Sciences; Arctic and Antarctic Research Institute; Shirshov Institute of Oceanology, Russian Academy of Sciences
Author for correspondence.
Email: yaovsepyan@yandex.ru
Russian Federation, Moscow, 119017; St. Petersburg, 199397; Moscow, 117997
E. E. Taldenkova
Lomonosov Moscow State University; Arctic and Antarctic Research Institute
Email: yaovsepyan@yandex.ru
Russian Federation, Moscow, 119991; St. Petersburg, 199397