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BENTHIC FORAMINIFERAL ASSEMBLAGES FROM THE SOUTHERN KARA SEA, A RIVER-INFLUENCED ARCTIC MARINE ENVIRONMENT

¹ Byrd Polar Research Center, Ohio State University, Columbus, Ohio 43210, USA.
² P. P. Shirshov Institute of Oceanology, Moscow 117851, Russia.
³ Arctic and Antarctic Research Institute, St. Petersburg 199397, Russia.
⁴ Institute of Geology, University of Tromsø, N-9037, Norway.
⁵ Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, USA.

^* Corresponding author: Byrd Polar Research Center, 1090 Carmack Rd., Columbus, OH, 43210; tel. 614-292-2602, fax 614-292-4697, E-mail: polyak.1{at}osu.edu

Calcareous foraminifers and hydrographic parameters in 113 bottom samples from the southern Kara Sea were examined to improve the usage of foraminifers as paleoenvironmental proxies for river-dominated high-latitude continental shelves. Foraminiferal taxa form a succession from near-estuarine to distal open-sea locations, characterized by a gradual increase in salinities. Foraminiferal assemblages are discriminated into three groups: river-proximal, -intermediate, and -distal. This succession appears to be controlled by a combination of feeding conditions and bottom salinities, and are related to riverine fluxes of freshwater, organic matter, and sediments. Morphological and behavioral adaptations of foraminifers to specific environments are discussed.

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