Specific Features of the Ecological Composition of Planktonic and Benthic Foraminifera in Surface Sediments of the Tatar Strait (Sea of Japan)

The fauna of planktonic and benthic foraminifera of the Tatar Strait was studied in the surface layer of sediments from bottom cores collected during cruise LV85 of the R/V Akademik Lavrentyev in May 2019. The communities of benthic foraminifera, consisting of living and dead shells, in their ecological appearance correspond to the modern cold-water oceanographic conditions of the sampling sites of the stations. Among the planktonic foraminifera, in addition to the dominant subarctic form Neogloboquadrina pachyderma dex., there are single tropical and subtropical species (Globorotalia inflatа, Globigerinoides ruber, and Neogloboquadrina dutertrei). The authors believe that the above-mentioned warm-water forms entered the Tatar Strait from the southwestern Sea of Japan with warm Tsushima Current waters. Fossil records of warm-water fauna in Pleistocene and Holocene sediments play an important role in interpreting the geological record in the northern Sea of Japan. Their presence in sedimentary sections makes it possible to trace the northward migration of warm currents and assess its influence on coastal ecosystems in the past.