Benthic biotic response to climate changes over the last 700,000_ years, the Sea of Japan; ostracode assemblages from site U1427, IODP Expedition 346_

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Author(s): Huang, Huai Hsuan May; Yasuhara, Moriaki; Iwatani, Hokuto; Alvarez Zarikian, Carlos A.; Bassetti, Maria-Angela; Sagawa, Takuya
Author Affiliation(s): Primary:
University of Hong Kong, School of Biological Sciences, Hong Kong, Hong-Kong
Texas A&M University, United States
University of Perpignan, France
Kanazawa University, Japan
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: The Sea of Japan is a marginal sea, semi-enclosed by the Eurasian Continent, Korean Peninsula, Japanese Islands, and shallow straits (water depth <130 m). Marginal seas are ideal natural laboratories to study biotic responses to large-scale paleoclimate-ocean mechanisms as they are typically sensitive to glacial/interglacial and stadial/interstadial cycles. The modern oceanographic setting in the Sea of Japan is characterized by the influx of the Tsushima Warm Current (TWC) from the East China Sea, and this setting was formed ∼1.7 My ago by tectonic subsidence of the Tsushima Strait. The Sea of Japan, therefore, is an interesting research subject for studying the biotic response to orbital-scale climate changes and benthic faunal development under the influence of TWC. Here we present 700,000-year record of benthic biotic response to the paleoceanographic changes in the southern Sea of Japan based on ostracode assemblage reconstruction at IODP Site U1427. Five local extinction events were caused by extreme bottom conditions (mainly oxygen depletion) during the Ice Age Terminations I, II, IV, V, and VII. Primary and secondary ostracode assemblages were revealed by Q-mode k-means clustering, CABFAC factor analysis, and non-metric multidimensional scaling. The primary ostracode components, characterized by Krithe sawanensis and Cytheropteron hyalinosa, broadly reflect glacial/interglacial and high-latitude insolation cycles. In contrast, a faunal shift determined by the secondary faunal components was driven by the TWC enhancement at ∼300 ka.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Arthropoda; Cenozoic; Climate change; Crustacea; Expedition 346; Holocene; IODP Site U1427; Integrated Ocean Drilling Program; Invertebrata; Japan Sea; Mandibulata; Microfossils; North Pacific; Northwest Pacific; Ostracoda; Pacific Ocean; Paleoclimatology; Paleoecology; Quaternary; West Pacific; Yamato Basin
Coordinates: N355755 N355756 E1342636 E1342636
Record ID: 2017062454
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