Holocene ostracode paleobiogeography in Osaka Bay, southwestern Japan

Aim To assess the genetic and archaeological evidence for the migration of modern humans out of Africa to the circum-Pacific region and compare the migration patterns with Late Pleistocene and Holocene changes in sea level and climate.Location Southern and eastern Asia, Australia, and Oceania.Methods Review of the literature and detailed compilations of data on early human settlements, sea level, and climate change.

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“…, 2004), Hong Kong (Yim et al. , 2004), Korea (Chang & Choi, 2001), and Japan (Tamura & Masuda, 2004; Yasuhara et al. , 2004).…”

Section: Late Glacial and Holocene Coastal Environemtentsmentioning

confidence: 99%

Environmental setting of human migrations in the circum‐Pacific region

Pope¹,

Terrell

2007

Journal of Biogeography

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“…In Osaka Bay and Plain (core OB‐1, W1, W2, and Bor.1), Iyonada (core K1, K2, S1, and S2), and Hiroshima Bay (core HIR94‐3), 190 out of 213 samples are analogous (Figure S6). Irizuki et al (2001) and Yasuhara et al (2004, 2005), and Yasuhara and Seto (2006), who studied ostracode assemblages with a focus on the ecology of dominant taxa and inferred paleo‐water depths, have inferred RSL changes from cores collected in core OB‐1, K1, K2, S1, S2, and HIR94‐3. In core K1 and K2, the results of RSL are concordant with Yasuhara et al (2005), considering the errors.…”

Section: Resultsmentioning

confidence: 99%

“…The water depths in the modern data set ranged from 0.3 to 50 m. We registered the data on the modern ostracode taxa and the locality and water depth of their habitats used for the MAT in the Dryad Digital Repository (https://datadryad.org/stash/share/Caof8eH1lrqg2vUUvuH20N71TqbLAOHBt4g5ydr8W2g). The fossil data set (i.e., the test data) consisted of the ostracode assemblages from core SKM and those from nine other cores from around Shikoku Island (sourced from Irizuki et al, 2001; Yasuhara et al, 2004, 2005; Yasuhara & Seto, 2006).…”

Section: Methodsmentioning

confidence: 99%

“…The well‐preserved microfossils in the core sediments make it possible to infer RSLs at many precisely dated horizons. Furthermore, previous studies have inferred RSLs from diatom and ostracode assemblages in 13 cores collected at various sites on Shikoku Island and in the surrounding region (Irizuki et al, 2001; Sato et al, 2001, 2003; Yasuhara et al, 2004, 2005; Yasuhara & Seto, 2006; Table 1). By correlating RSLs between these sites and core SKM, it should be possible to infer tectonic crustal movements due to the subduction of the Philippine Sea plate during the Holocene.…”

Section: Introductionmentioning

confidence: 99%

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Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

et al. 2022

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The Philippine Sea plate subducts beneath the Eurasia plate at the Nankai Trough, northwestern Pacific, causing crustal deformation, mega‐thrust earthquakes, and tsunami events. Shikoku Island, 150 km northwest of the trough, experiences both coseismic and interseismic deformation. Coastal sediments potentially record vertical crustal movements as relative sea level (RSL) changes. We studied sedimentary facies and microfossil ostracodes in core SKM from southwestern Shikoku Island for evidence of middle Holocene tsunami events and deformation. The core sediments included nine event layers corresponding to storm or tsunami events. Using modern analog techniques, we estimated RSLs from the ostracode assemblages of core SKM and 13 other cores from Shikoku Island and the surrounding region. Then, we subtracted RSL changes due to glacio‐hydro isostatic adjustment from the estimated RSLs to estimate vertical tectonic movement rates in these cores between 8.6 and 4.7 ka. The inferred RSL changes suggest that the Sukumo site has experienced both uplift and subsidence since 8.6 ka. Before 6.6 ka, rates of tectonic crustal movement were higher than the modern‐day rate, and its spatial distribution also differed. After 6.6 ka, tectonic crustal movement showed a similar spatial pattern and occurred at rates close to the modern day interseismic rate. The spatial pattern and rates of tectonic crustal movement could be caused by changes in rupture areas between the Eurasia and the Philippine Sea plates beneath the Shikoku Island and in stress condition of the asthenosphere. Some of the vertical displacements can be explained by the movements of local active faults.

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“…Seventeen percent (1171 out of 6767 total specimens) were living. Ostracode biotopes were determined by Q-mode cluster analysis based on Horn's overlap index (Horn 1966) and the unweighted pair group method with arithmetic mean (UPGMA: Sneath and Sokal 1973), which have been successfully applied for ostracode faunal analysis (e.g., Yasuhara et al 2003;Irizuki et al 2004;Yasuhara et al 2004), using PAST ver. 1.38b (http://folk.uio.no/ohammer/past/; Hammer et al 2001).…”

Section: Ostracode Biotopesmentioning

confidence: 99%

Modern benthic ostracodes from Lutzow-Holm Bay, East Antarctica: paleoceanographic, paleobiogeographic, and evolutionary significance

et al. 2007

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Seventy-three ostracode species from 38 genera were recovered from the 55 surface sediment samples in Lützow-Holm Bay, northeastern Antarctica. We investigated bathymetric and geographic distributions of modern benthic ostracode species in the bay and compared this fauna with published modern and fossil ostracode data of Antarctic and southern South American regions. The results show: (1) Four biotopes and three sub-biotopes are recognized based on Q-mode cluster analysis, which suggest distributions of modern ostracodes are mainly controlled by water-mass structure, ice scouring, and light availability. (2) Comparison between the Lützow-Holm Bay fauna and other ostracode faunas from Antarctica and southern South America shows high endemism and homogeneity of Antarctic ostracode fauna, suggesting in situ evolution of most extant Antarctic species. (3) Most species are endemic to the Antarctica, a few species also inhabit South American waters.

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Holocene ostracode paleobiogeography in Osaka Bay, southwestern Japan

Cited by 18 publications

References 13 publications

Environmental setting of human migrations in the circum‐Pacific region

Environmental setting of human migrations in the circum‐Pacific region

Middle Holocene relative sea‐level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan

Modern benthic ostracodes from Lutzow-Holm Bay, East Antarctica: paleoceanographic, paleobiogeographic, and evolutionary significance

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