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  1. Article ; Online: Using tsunami deposits to determine the maximum depth of benthic burrowing.

    Koji Seike / Kotaro Shirai / Naoko Murakami-Sugihara

    PLoS ONE, Vol 12, Iss 8, p e

    2017  Volume 0182753

    Abstract: The maximum depth of sediment biomixing is directly related to the vertical extent of post-depositional environmental alteration in the sediment; consequently, it is important to determine the maximum burrowing depth. This study examined the maximum ... ...

    Abstract The maximum depth of sediment biomixing is directly related to the vertical extent of post-depositional environmental alteration in the sediment; consequently, it is important to determine the maximum burrowing depth. This study examined the maximum depth of bioturbation in a natural marine environment in Funakoshi Bay, northeastern Japan, using observations of bioturbation structures developed in an event layer (tsunami deposits of the 2011 Tohoku-Oki earthquake) and measurements of the radioactive cesium concentrations in this layer. The observations revealed that the depth of bioturbation (i.e., the thickness of the biomixing layer) ranged between 11 and 22 cm, and varied among the sampling sites. In contrast, the radioactive cesium concentrations showed that the processing of radioactive cesium in coastal environments may include other pathways in addition to bioturbation. The data also revealed the nature of the bioturbation by the heart urchin Echinocardium cordatum (Echinoidea: Loveniidae), which is one of the important ecosystem engineers in seafloor environments. The maximum burrowing depth of E. cordatum in Funakoshi Bay was 22 cm from the seafloor surface.
    Keywords Medicine ; R ; Science ; Q
    Subject code 551
    Language English
    Publishing date 2017-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Stimpson's hard clam Mercenaria stimpsoni; A multi-decadal climate recorder for the northwest Pacific coast

    Shirai, Kotaro / Kaoru Kubota / Kazushige Tanabe / Koji Seike / Masataka Hakozaki / Naoko Murakami-Sugihara

    Marine environmental research. 2018 Feb., v. 133

    2018  

    Abstract: A sclerochronological and radiocarbon-based study of life history traits of Stimpson's hard clam (Mercenaria stimpsoni), collected alive from Funakoshi Bay, northeast Japan, showed the lifespan of the species to be at least 92 years (determined from ... ...

    Abstract A sclerochronological and radiocarbon-based study of life history traits of Stimpson's hard clam (Mercenaria stimpsoni), collected alive from Funakoshi Bay, northeast Japan, showed the lifespan of the species to be at least 92 years (determined from annual growth line counts). Three M. stimpsoni specimens exhibited the following synchronous growth pattern, suggestive of environmental control; annual increment width increasing after 1955 to a maximum value between 1970 and 1980, subsequently decreasing gradually until 2000, and thereafter remaining constant or increasing slightly. Variations on annual growth patterns, as well as standardized growth indices chronology, were relatively closely linked to the Atlantic Multidecadal Oscillation (AMO), but less so to Pacific Decadal Oscillation (PDO). Carbonate samples collected from ontogenetically younger shell portions, estimated from growth line counts to have been deposited before 1950, contained no nuclear bomb-test radiocarbon, thereby supporting the accuracy of annual growth line counts (versus overcounting from ventral margin). Together with the synchronous annual increment width patterns, this indicated that age and annual growth rate estimations for M. stimpsoni based on growth line counts were reliable and applicable to high-resolution sclerochronological analyses, which should contribute to a deeper understanding of multi-decadal northwest Pacific climate variability.
    Keywords clams ; climate ; coasts ; life history ; longevity ; Mercenaria ; Japan
    Language English
    Dates of publication 2018-02
    Size p. 49-56.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1502505-6
    ISSN 1879-0291 ; 0141-1136
    ISSN (online) 1879-0291
    ISSN 0141-1136
    DOI 10.1016/j.marenvres.2017.10.009
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  3. Article ; Online: Divalent metal transporter-related protein restricts animals to marine habitats

    Mieko Sassa / Toshiyuki Takagi / Azusa Kinjo / Yuki Yoshioka / Yuna Zayasu / Chuya Shinzato / Shinji Kanda / Naoko Murakami-Sugihara / Kotaro Shirai / Koji Inoue

    Communications Biology, Vol 4, Iss 1, Pp 1-

    2021  Volume 9

    Abstract: Mieko Sassa et al. report a novel divalent metal transporter protein (DMTRP) in the crown-of-thorns starfish genome and determine that all organisms with a DMTRP gene are located in marine habitats. They also show in a functional yeast system that DMTRP ... ...

    Abstract Mieko Sassa et al. report a novel divalent metal transporter protein (DMTRP) in the crown-of-thorns starfish genome and determine that all organisms with a DMTRP gene are located in marine habitats. They also show in a functional yeast system that DMTRP can prevent uptake of certain metals, bringing insight into the evolution of metal regulation for marine organisms.
    Keywords Biology (General) ; QH301-705.5
    Language English
    Publishing date 2021-04-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
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  4. Article ; Online: Influence of normal tide and the Great Tsunami as recorded through hourly-resolution micro-analysis of a mussel shell

    Yuji Sano / Tomoyo Okumura / Naoko Murakami-Sugihara / Kentaro Tanaka / Takanori Kagoshima / Akizumi Ishida / Masako Hori / Glen T. Snyder / Naoto Takahata / Kotaro Shirai

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 12

    Abstract: Abstract We report here hourly variations of Mg/Ca, Sr/Ca, and Ba/Ca ratios in a Mediterranean mussel shell (Mytilus galloprovincialis) collected at the Otsuchi bay, on the Pacific coast of northeastern Japan. This bivalve was living in the intertidal ... ...

    Abstract Abstract We report here hourly variations of Mg/Ca, Sr/Ca, and Ba/Ca ratios in a Mediterranean mussel shell (Mytilus galloprovincialis) collected at the Otsuchi bay, on the Pacific coast of northeastern Japan. This bivalve was living in the intertidal zone, where such organisms are known to form a daily or bidaily growth line comprised of abundant organic matter. Mg/Ca ratios of the inner surface of the outer shell layer, corresponding to the most recent date, show cyclic changes at 25–90 μm intervals, while no interpretable variations are observed in Sr/Ca and Ba/Ca ratios. High Mg/Ca ratios were probably established by (1) cessation of the external supply of Ca and organic layer forming when the shell is closed at low tide, and (2) the strong binding of Mg to the organic layer, but not of Sr and Ba. Immediately following the great tsunami induced by the 2011 Tohoku earthquake, Mg/Ca enrichment occurred, up to 10 times that of normal low tide, while apparent Ba/Ca enrichment was observed for only a few days following the event, therefore serving a proxy of the past tsunami. Following the tsunami, periodic peaks and troughs in Mg/Ca continued, perhaps due to a biological memory effect as an endogenous clock.
    Keywords Medicine ; R ; Science ; Q
    Subject code 551
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Retrospective monitoring of salinity in coastal waters with mussel shells

    Zhao, Liqiang / Kotaro Shirai / Naoko Murakami-Sugihara / Tomihiko Higuchi / Takashi T. Sakamoto / Toshihiro Miyajima / Kiyoshi Tanaka

    Science of the total environment. 2019 June 25, v. 671

    2019  

    Abstract: Sea surface salinity (SSS) is a key parameter to understand and predict many physical, chemical and biological processes in dynamic coastal environments. Yet, in many regions, instrumental measurements are spatially sparse and insufficiently long, ... ...

    Abstract Sea surface salinity (SSS) is a key parameter to understand and predict many physical, chemical and biological processes in dynamic coastal environments. Yet, in many regions, instrumental measurements are spatially sparse and insufficiently long, hindering our ability to document changes, causes, and consequences of SSS across different time scales. Therefore, there is an need to develop a robust proxy to extend SSS records back in time. Here, we test whether SSS can be reconstructed reliably and quantitatively from shell oxygen isotopic ratios (δ18Oshell) of the mussel Mytilus galloprovincialis (Lamarck, 1819) in Otsuchi Bay, Northern Japan. δ18Oshell ratios vary spatially and temporally and exhibit strong linear correlations with both sea surface temperature (SST) and SSS measurements, indicating that the composite signal recorded by δ18Oshell measurably responds to variations in both parameters. By combining contemporaneous variations of SST and δ18Oshell, SSS records encoded into mussel shells are deconvolved that significantly correlate with in situ SSS values. To further validate the robustness of δ18Oshell as a quantitative SSS proxy, high-resolution and temporally aligned time-series of δ18Oshell-derived SSS are reconstructed that are highly synchronous with the instrumental records. In particular, two lowered SSS scenarios occur concomitantly with periods of the summer monsoon and typhoon events. δ18Oshell-derived SSS time-series are also comparable to those from numerical modeling. In conclusion, our findings demonstrate that mussel δ18Oshell signatures can be used as a useful tool to construct high-resolution records of SSS in the coastal regions.
    Keywords Mytilus galloprovincialis ; coastal water ; coasts ; mathematical models ; monitoring ; monsoon season ; mussels ; oxygen ; salinity ; shell (molluscs) ; summer ; surface water temperature ; time series analysis ; typhoons ; Japan
    Language English
    Dates of publication 2019-0625
    Size p. 666-675.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2019.03.405
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (1.OG)
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  6. Article: Annual shell growth pattern of the Stimpson's hard clam Mercenaria stimpsoni as revealed by sclerochronological and oxygen stable isotope measurements

    Kubota, Kaoru / Kotaro Shirai / Naoko Murakami-Sugihara / Koji Seike / Masako Hori / Kazushige Tanabe

    Palaeogeography, palaeoclimatology, palaeoecology. 2017 Jan. 01, v. 465

    2017  

    Abstract: Mercenaria stimpsoni (Stimpson's hard clam) is a shallow-water bivalve species distributed along mid- to high-latitude coasts of the Northwest Pacific influenced by the Oyashio cold current. As this animal can live for decades, oxygen isotopes of its ... ...

    Abstract Mercenaria stimpsoni (Stimpson's hard clam) is a shallow-water bivalve species distributed along mid- to high-latitude coasts of the Northwest Pacific influenced by the Oyashio cold current. As this animal can live for decades, oxygen isotopes of its shell can potentially provide long-term seawater temperature and salinity data. However, little is known about the life history traits of M. stimpsoni, which hampers their use in paleoclimatology. Thus, we investigated the growth patterns of three live-caught M. stimpsoni individuals from Funakoshi Bay, especially focusing on juvenile ontogenetic stages. Sclerochronological and high-resolution oxygen isotope analyses suggest that young (below age 10) specimens of this species grow predominantly between spring and fall, but ceased growing during the cold season when sea surface temperature drops below approximately 10°C. The results also show that ontogenetically older (>10yr) specimens grow shell material almost exclusively during summer. Oxygen isotopes in ontogenetically younger portions of the shells are a good indicator of past summer temperatures.
    Keywords Mercenaria ; autumn ; clams ; coasts ; cold season ; juveniles ; latitude ; life history ; ontogeny ; oxygen ; paleoclimatology ; salinity ; seawater ; spring ; stable isotopes ; summer ; surface water temperature
    Language English
    Dates of publication 2017-0101
    Size p. 307-315.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 417718-6
    ISSN 0031-0182
    ISSN 0031-0182
    DOI 10.1016/j.palaeo.2016.05.016
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    In stock of ZB MED Bonn / Germany

    Z 67/162: Show issues

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  7. Article: Interannual to decadal variability of summer sea surface temperature in the Sea of Okhotsk recorded in the shell growth history of Stimpson's hard clams (Mercenaria stimpsoni)

    Tanabe, Kazushige / Bernd R. Schöne / Kaoru Kubota / Kotaro Shirai / Naoko Murakami-Sugihara / Toshihiro Mimura / Tsuzumi Miyaji

    Global and planetary change. 2017 Oct., v. 157

    2017  

    Abstract: Sclerochronological and shell stable oxygen isotopic analyses were conducted on live-caught specimens of Stimpson's hard clams, Mercenaria stimpsoni, from the southern Sea of Okhotsk, off northern Hokkaido, Japan. In this region, the main growing season ... ...

    Abstract Sclerochronological and shell stable oxygen isotopic analyses were conducted on live-caught specimens of Stimpson's hard clams, Mercenaria stimpsoni, from the southern Sea of Okhotsk, off northern Hokkaido, Japan. In this region, the main growing season of this species during early ontogeny (below the age of 12years) lasts from mid-spring to mid-fall at sea surface temperatures (SST) between approximately 10 and 22°C. Growth cessation begins between late fall and early spring at SST, below approximately 6°C; however, shell growth was largely limited to the summer season later in life. Counting of annual increments indicated that this species had a relatively long life span of up to 100years. Annual shell growth rates were high during early ontogeny and declined abruptly afterwards. Mean standardized shell growth indices (SGIs) of long-lived specimens were positively correlated to the mean summer SSTs near the sampling site and in the coastal waters off northern Hokkaido. The SGI chronology of the longest-lived specimen (99years old) exhibited periodicities of approximately 10 and 5years during the calendar years 1920–2011, possibly reflecting the quasi-decadal variability of summer SST in the southern Sea of Okhotsk. These findings indicate that M. stimpsoni could serve as an archive to reconstruct past marine climate changes in the Sea of Okhotsk.
    Keywords autumn ; clams ; climate change ; coastal water ; correlation ; growing season ; longevity ; Mercenaria ; ontogeny ; oxygen ; spring ; summer ; surface water temperature ; Japan
    Language English
    Dates of publication 2017-10
    Size p. 35-47.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 2016967-X
    ISSN 0921-8181
    ISSN 0921-8181
    DOI 10.1016/j.gloplacha.2017.08.010
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  8. Article: Spatial Distribution and Temporal Trend of Anthropogenic Organic Compounds Derived from the 2011 East Japan Earthquake

    Mizukawa, Kaoruko / Yasuko Hirai / Hiroyuki Sakakibara / Satoshi Endo / Keiji Okuda / Hideshige Takada / Naoko Murakami-Sugihara / Kotaro Shirai / Hiroshi Ogawa

    Archives of environmental contamination and toxicology. 2017 Aug., v. 73, no. 2

    2017  

    Abstract: The tsunami caused by the Great East Japan Earthquake on March 11, 2011 disturbed coastal environments in the eastern Tohoku region in Japan. Numerous terrestrial materials, including anthropogenic organic compounds, were deposited in the coastal zone. ... ...

    Abstract The tsunami caused by the Great East Japan Earthquake on March 11, 2011 disturbed coastal environments in the eastern Tohoku region in Japan. Numerous terrestrial materials, including anthropogenic organic compounds, were deposited in the coastal zone. To evaluate the impacts of the disaster, we analyzed PCBs, LABs, PAHs, and hopanes in mussels collected from 12 locations in the east of Tohoku during 2011–2015 (series A) by GC-ECD or GC–MS and compared them with results from mussels collected from 22 locations around Japan during 2001–2004 (series B). Early LAB concentrations in series A at some locations were higher than the maximum concentrations in series B but decreased during the 5 years. Because LABs are molecular markers for sewage, these decreases are consistent with the recovery of sewage treatment plants in these areas. Early PAH concentrations at several locations were higher than the maximum concentrations in series B but also decreased. These high concentrations would have been derived from oil spills. The decreases of both LABs and PAHs indicate that these locations were affected by the tsunami but recovered. In contrast, later high concentrations of target compounds were detected sporadically at several locations. This pattern suggests that environmental pollution was caused by human activities, such as reconstruction. To understand the long-term trend of environmental pollution induced by the disaster, continuous monitoring along the Tohoku coast is required.
    Keywords coasts ; earthquakes ; gas chromatography-mass spectrometry ; genetic markers ; humans ; monitoring ; mussels ; oil spills ; pollution ; polychlorinated biphenyls ; polycyclic aromatic hydrocarbons ; sewage ; tsunamis ; Japan
    Language English
    Dates of publication 2017-08
    Size p. 185-195.
    Publishing place Springer US
    Document type Article
    ZDB-ID 185986-9
    ISSN 1432-0703 ; 0090-4341
    ISSN (online) 1432-0703
    ISSN 0090-4341
    DOI 10.1007/s00244-017-0389-6
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    In stock of ZB MED Bonn / Germany

    Z 7585: Show issues

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