80 sediment stations and 4 sediment cores collected in the Sea of Okhotsk were used in this study in order to reveal additional proxy for past climate reconstruction based on planktonic foraminifera. Variation in diversity indices (Simpson, Shannon and equitability indices) along the sea became additional criteria for 5 biogeographical provinces based on planktonic foraminifera. All of them show different structure aspects of the planktonic foraminifera assemblages that is very informative in cases of high relative abundance of N. pachyderma sin. and influence of carbonate dissolution factor. During the last 100 ky the diversity indices were changed and we can assume the migration of biogeographical provinces borders: borders of the Northern province were mov- ed to the central part in cold MIS 2, 4, structure of assemblages during MIS 3, 5 was close to the modern Central province but characterized by low total foraminiferal abundance in the sediments. The Simpson and Shannon indices are more sensitive to changes in structure of planktonic foraminifera assemblages when equitability index varies lightly during the Late Pleistocene-Holocene.
 Dieckmann, G. , Spindler, M. , Lange, M. A. , Ackley, S. F. & Eicken, H. (1991): Antarctic Sea Ice: A Habitat for the Foraminifer Neogloboquadrina Pachyderma. Journal of Foraminiferal Research, 21, 182-189. http://dx.doi.org/10.2113/gsjfr.21.2.182
 Gorbarenko, S. A., Southon J. R., Keigwin L. D., Cherepanova M. V., & Gvozdeva I. G. (2004). Late Pleistocene-Holocene Oceanographic Variability in The Okhotsk Sea: Geochemical, Litho-logical And Paleontological Evidence. Palaeogeo-graphy Palaeoclimatology Palaeoecology, 209, 281-301. http://dx.doi.org/10.1016/j.palaeo.2004.02.013
 Romanova, A. (2013). Paleogeography of Sedimentation in Sea Of Okhotsk during Late Pleistocene-Holocene (Based on Data from Planktonic Foraminifera Analysis). Reporter KRASSC. Earth Sciences, 21, 183-194.
 Romanova, A., Cherepanova, M., & Gorbarenko, S. (2014). Planktonic Foraminifera as Paleoenvironmental Proxies of Upper Quaternary Sedimentation in the Okhotsk Sea. Russian Journal of Pacific Geology, 33, 89-101.
 Talley, L. D. (1993). Distribution and Formation of North Pacific Intermediate Water. Journal of Physical Oceanography, 23, 517-537. http://dx.doi.org/10.1175/1520-0485(1993)023<0517:DAFONP>2.0.CO;2