Late Miocene polycystine radiolarians of the Japan Sea (IODP Exp. 346 Site U1425)

Matsuzaki, Kenji M.; Itaki, Takuya

doi:10.9795/bullgsj.70.195

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The subarctic shallow species only comprised Cycladophora sphaeris , and the intermediate water species group comprised Larcopyle weddellium and Tricolocapsa papillosa . All the selected radiolarian species from site U1425 were illustrated, and their faunal references were provided in previous studies 40 . However, the species name of Tricolocapsa papillosa (previously Carpocanarium papillosum ) was amended following the latest nomenclature 64 .…”

Section: Analysis Of Radiolariansmentioning

confidence: 99%

“…This program can identify whether the peaks in a spectrum of a time series are significant against the red-noise (autoregressive lag1) background spectrum. For the same site, we also conducted spectral analyses on sediment reflectance data (L*) 33 , which is a semiquantitative proxy for the total organic carbon (TOC) 40 , and sea-level change 43 for comparison with the radiolarian records.…”

Section: Spectral Analysismentioning

confidence: 99%

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Weakened pacific overturning circulation, winter monsoon dominance and tectonism re-organized Japan Sea paleoceanography during the Late Miocene global cooling

Matsuzaki

Ikeda

Tada

2022

Sci Rep

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The Late Miocene global cooling (LMGC; approximately 7.9–5.8 Ma) was associated with remarkable changes in monsoon dynamics, biogenic bloom in the global oceans, and the rise of modern ecosystems at the expense of old biota. However, the possible linkage between the environmental changes and ecosystem shifts during the LMGC is still debated. In this paper, we show the high-resolution changes in the fluxes of selected radiolarian species, suggesting a drastic reorganization in the paleoceanography and ecosystem in the Japan Sea during the LMGC. The endemic radiolarian Cycladophora nakasekoi dominated the Japan Sea until 7.4 Ma when the Japan Sea sediment changed from dark radiolarian-rich sediment to organic-poor diatom ooze. Changes in the fluxes of C. nakasekoi and Tricolocapsa papillosa, the latter related to changes in the Pacific central water (PCW), show 100, 200, and ~ 500 ka cycles with their high flux mostly within the darker sediment intervals during the low-eccentricity period until 7.4 Ma, suggesting that orbitally paced PCW inflow might have been the major nutrient source into the Japan Sea. At about 7.4 Ma, these species decreased at the expense of increased Larcopyle weddellium, a radiolarian related to the North Pacific intermediate water (NPIW), and Cycladophora sphaeris, a subarctic radiolarian species, implying a decrease in PCW inflow and an increase in the inflow of NPIW and subarctic shallow water. Such a change would have been related to the LMGC-induced weakening in the Pacific Meridional overturning circulation and the southward shift of the subarctic front due to intensified East Asian winter monsoon. Such a drastic reorganization in the hydrography in the Japan Sea probably caused changes in nutrient provenance from the PCW to the NPIW and resulted in faunal turnover, marked by the disappearance of the old regional and endemic faunal components, such as C. nakasekoi.

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Section: Analysis Of Radiolariansmentioning

confidence: 99%

Section: Spectral Analysismentioning

confidence: 99%

Weakened pacific overturning circulation, winter monsoon dominance and tectonism re-organized Japan Sea paleoceanography during the Late Miocene global cooling

Matsuzaki

Ikeda

Tada

2022

Sci Rep

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“…(Figure 5b). Other debris (and fragments) equipped with chequered or hexagonal pore arrangement, which was disposed of in both transverse and longitudinal rows, might be part of siliceous cone‐shaped skeletons from Nassellarians and/or centric diatom frustules (Figure 5c–j) (Gibaud et al., 2019; Matsuzaki & Itaki, 2019). Noteworthy, the morphology observed in the micro‐remains shown in Figure 5k–n, which would represent frustule cylindrical fragments and/or partially dissolved concentric ringleistes of Aulacoseira valves (more in general Aulacoseirales order) (diameter: 17–36 μm).…”

Section: Resultsmentioning

confidence: 99%

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

D'Agostino,

Di Marco,

Rolfo

et al. 2024

Ecology and Evolution

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Plants have always represented a key element in landscape delineation. Indeed, plant diversity, whose distribution is influenced by geographic/climatic variability, has affected both environmental and human ecology. The present contribution represents a multi‐proxy study focused on the detection of starch, pollen and non‐pollen palynomorphs in ancient dental calculus collected from pre‐historical individuals buried at La Sassa and Pila archaeological sites (Central Italy). The collected record suggested the potential use of plant taxa by the people living in Central Italy during the Copper‐Middle Bronze Age and expanded the body of evidence reported by previous palynological and palaeoecological studies. The application of a microscopic approach provided information about domesticated crops and/or gathered wild plants and inferred considerations on ancient environments, water sources, and past health and diseases. Moreover, the research supplied data to define the natural resources (e.g., C4‐plant intake) and the social use of the space during that period. Another important aspect was the finding of plant clues referable to woody habitats, characterised by broad‐leaved deciduous taxa and generally indicative of a warm‐temperate climate and grassy vegetation. Other unusual records (e.g., diatoms, brachysclereids) participated in defining the prehistoric ecological framework. Thus, this work provides an overview on the potential of the human dental calculus analysis to delineate some features of the ancient plant ecology and biodiversity.

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Les radiolaires messiniens du Dahra (Bassin du Bas Chélif, Algérie) : systématique et intérêt biostratigraphique

Samet

Marok

Reolid

et al. 2021

Annales de Paléontologie

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Late Miocene polycystine radiolarians of the Japan Sea (IODP Exp. 346 Site U1425)

Cited by 7 publications

References 20 publications

Weakened pacific overturning circulation, winter monsoon dominance and tectonism re-organized Japan Sea paleoceanography during the Late Miocene global cooling

Weakened pacific overturning circulation, winter monsoon dominance and tectonism re-organized Japan Sea paleoceanography during the Late Miocene global cooling

Microparticles from dental calculus disclose paleoenvironmental and palaeoecological records

Les radiolaires messiniens du Dahra (Bassin du Bas Chélif, Algérie) : systématique et intérêt biostratigraphique

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