2021/05/13 更新

写真a

シイノ ユウタ
椎野 勇太
SHIINO Yuta
所属
教育研究院 自然科学系 地球・生物科学系列 准教授
理学部 理学科 准教授
職名
准教授
外部リンク

学位

  • 博士(理学) ( 2009年3月   東京大学 )

  • 修士(理学) ( 2006年3月   静岡大学 )

  • 学士(理学) ( 2004年3月   静岡大学 )

研究分野

  • ライフサイエンス / 進化生物学

  • ものづくり技術(機械・電気電子・化学工学) / 流体工学

  • 自然科学一般 / 固体地球科学

  • 自然科学一般 / 地球生命科学

  • ライフサイエンス / 多様性生物学、分類学  / 進化形態学

経歴(researchmap)

  • 新潟大学   理学部理学科地質科学プログラム   准教授

    2016年4月 - 現在

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  • 新潟大学   教育研究院自然科学系   助教

    2014年4月 - 2016年3月

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  • 東京大学   総合研究博物館   特任助教

    2012年4月 - 2014年3月

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  • 国立科学博物館   日本学術振興会特別研究員

    2010年4月 - 2012年3月

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  • 東京大学   日本学術振興会特別研究員

    2008年4月 - 2010年3月

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経歴

  • 新潟大学   理学部 理学科   准教授

    2017年4月 - 現在

  • 新潟大学   地球物質科学   准教授

    2016年4月 - 2017年3月

  • 新潟大学   自然科学研究科 環境科学専攻 地球科学   助教

    2014年4月 - 2016年3月

所属学協会

▶ 全件表示

取得資格

  • 学芸員

 

論文

  • A morphological analysis of the flat-shaped spumellarian radiolarian Dictyocoryne: morpho-functional insights into planktonic mode of life 査読

    Yuta Shiino, Toshiyuki Kurihara, Ryo Ichinohe, Naoko Kishimoto, Takashi Yoshino, Atsushi Matsuoka

    PALEONTOLOGICAL RESEARCH24 ( 2 ) 134 - 146   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    The three-dimensional morphology of the flat-shaped spumellarian radiolarian Dictyocoryne was analysed using a microfocus X-ray CT with a special focus on whether it was capable of a planktonic lifestyle. Two types of 3D models, the shell model, which represents a realistic 3D shell, and the wrapped model, which mimics the whole body outline without pseudopodia, were reconstructed in order to estimate volume, surface area, and centres of gravity for the shell model and buoyancy for the wrapped model. The calculated values showed that the volume of shell with respect to the total volume was negatively allometric, regardless of the differences between threshold settings. Stepwise secretions of the patagium layer may result in a comparatively lightweight shell, thereby decreasing the total density during growth but not below the density of seawater. Estimated positions for the centres of gravity and buoyancy were too close to maintain an autonomous posture while floating. Instead, the ratio between surface area and volume was greater than that in an ideal sphere. Such a broad surface area could obtain the viscous resistance necessary for sinking retardation. Spumellarian radiolarians, including Dictyocoryne, have photosynthetic symbionts located primarily in the ectoplasmic layer, which is a habitable space that can be maximised within the larger surface area. Given that radiolarians float when extending their pseudopodia, it can be hypothesised that pseudopodia may play a role in the adjustment of life posture in a hydraulically unstable shell, which can be integrated into sinking retardation, enhancement of photosynthetic activity and manoeuvrability of life posture within a unique flat-shaped morphogenesis.

    DOI: 10.2517/2019PR020

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  • Active floating with buoyancy of pseudopodia versus passive floating by hydrodynamic drag force: A case study of the flat-shaped spumellarian radiolarian Dictyocoryne 査読

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara, Naoko Kishimoto

    PALEONTOLOGICAL RESEARCH23 ( 4 ) 236 - 244   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    It has been suggested that the pseudopodia of radiolarians play a role in controlling buoyancy for floating behaviour. To understand the function of pseudopodia in terms of planktonic capability, we performed culture experiments on the flat-shaped radiolarian Dictyocoryne. A glass cell, a stereomicroscope and an X-Y-Z stage were used to observe the behaviour of Dictyocoryne from a lateral view. Under static conditions, Dictyocoryne grounded on the bottom of the glass cell extended pseudopodia from both sides of the flat disc surface. Subsequently, these individuals rose slightly by a length equal to that of the extended pseudopodia but remained attached to the bottom. These results suggest that Dictyocoryne lacks the ability to surface by obtaining buoyancy through the emergence of pseudopodia. Under conditions of convection flow, Dictyocoryne moved in the downstream direction only when pseudopodia were completely extended. When the convection flow moved upward, the individuals moved with the flow to just under the surface. In addition, convection flow changed the direction of a long, thick pseudopodium, called the axoflagellum, to be parallel with the flow. Consequently, the axoflagellum was always oriented towards the downstream side, being the disc face in the axollagellum side on the upturn. Given that the flat-shaped spumellarians has c symbiotic algae inside their cells, their unique planktonic capability leads to the stable efficiency of the algal photosynthesis.

    DOI: 10.2517/2018PR023

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  • The passive spatial behaviour and feeding model of living nassellarian radiolarians: Morpho-functional insights into radiolarian adaptation 査読

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara

    MARINE MICROPALEONTOLOGY140   95 - 103   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Sinking experiments using living nassellarian radiolarians with a conical shell form were performed to examine the spatial behaviour of nassellarians and a related feeding model. A small water tank and surface-reflecting mirror were used to observe the vertical movement of each specimen, and the sinking posture and speed were analysed. The experimental results showed that the sinking posture of nassellarians was stable with a cephalis-down orientation, and the sinking speed was considerably slower than that of Dictyocoryne spp. as a control experiment. The stable posture was maintained by a streamlining shell form and the relationship between the centres of gravity and buoyancy. Moreover, a lift force in moving fluids would likely change the posture of the organism to the cephalis facing upstream, as in a weathercock effect. As a result, nassellarians were able to capture organic matter around the rear side of the aperture where prey-capturing pseudopodia are extended. Because the pseudopodia may be attributed to the lifelong performance of the surface of cell membranes, the drastic change in flow intensity around the pseudopodia leads to an easier collapse of the prey-capturing apparatus. A slower sinking speed as the size increases is a beneficial feature for avoiding the feeding risk, resulting in effective predation as a form of homeostatic spatial behaviour.

    DOI: 10.1016/j.marmicro.2018.02.002

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  • How does flow recruit epibionts onto brachiopod shells? Insights intoreciprocal interactions within the symbiotic framework 査読

    Yuta Shiino, Yuki Tokuda

    PALAEOWORLD25 ( 4 ) 675 - 683   2016年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Computational fluid dynamics simulations were performed to examine the passive recruitment of epibionts onto Devonian spiriferide brachiopod host shells. Because many planktonic larvae and spores are propulsion-inefficient swimmers, we determined the areas most prone to settlement in terms of inertial impaction and direct interception, which are characteristic of higher and lower pressure, respectively. Simulations on a unique specimen of Paraspirifer with a geopetal structure of broken brachidia suggest that the larva of Aulopora on the shell was transported and had settled onto the shell through inertial impaction after the host was dead and overturned on the sea floor. In the case of an ideal life posture, the spiriferide models received higher pressure on the shell surfaces at the forward and rearward stagnation areas and lower pressure along the shell margins and the anterior part of the sulcus, regardless of whether the ventral or the dorsal valve was facing upstream. Both sites seem to be available for epibionts by way of direct interception or inertial impaction. Our results indicate that the initial recruitment of most epibionts is accidental and passive, whereas the directions and patterns of epibiont growth suggest a biological response to ambient conditions. (C) 2016 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.

    DOI: 10.1016/j.palwor.2016.04.001

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  • Crininicaminus giberti isp. nov.: Tubular trace fossil armored with crinoid stem plates from the Upper Permian Kamiyasse Formation, Northeastern Japan | Crininicaminus giberti isp. nov.: Un ichnofósil tubular de pared compuesta por placas pedunculares de 査読

    Seike K, Shiino Y, Suzuki Y

    Spanish Journal of Paleontology29 ( 1 ) 45 - 50   2016年

  • Construction of recirculating flow tank with water pumps: insight into experimental palaeontology 査読

    Tsuchida, T, Shiino, Y

    Science Reports of Niigata University. Series E, (Geology)31   83 - 90   2016年

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    担当区分:責任著者   記述言語:英語  

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  • A rectifying effect by internal structures for passive feeding flows in a concavo-convex productide brachiopod 査読

    Yuta Shiino, Yutaro Suzuki

    PALEONTOLOGICAL RESEARCH19 ( 4 ) 283 - 287   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    It has been experimentally shown that the shell morphology of concavo-convex productide brachiopods has the potential to generate passive flows for feeding. However, there still remains the problem of how the presence of internal soft parts influences the course and pattern of the flows. To clarify the effect of soft parts, we performed additional experiments of fluid visualisation using a flow tank and a transparent, polyhedral model with supposed soft parts in a postero-median region. Regardless of the ambient flow directions, the experimental results showed that inflows through ear gapes turned into symmetrical vortices inside the model. The soft parts altered the course of internal flows and interfered with the vortices entering the median region. Therefore, stepwise inflows pushed the precedent vortices forward as the rotational speed decreased. As a result, the slower vortices aligned with the brachial ridges on which the lophophore was arranged. Morphologically, productide brachial ridges tend to lie in the antero-lateral corners of the dorsal disc. The rectifying effect by means of soft parts, though consequential, would enable productides to sieve food particles from gentle vortices rather than from swift vortices just after the inflow through the ear gapes.

    DOI: 10.2517/2015PR011

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  • Late Ordovician Holorhynchus succession in the Siljan district, Sweden: facies, faunas and a latest Katian event 査読

    Yuta Shiino, Yutaro Suzuki, David A. T. Harper, Hideki Mori, Jan Bergstrom

    GFF137 ( 1 ) 25 - 35   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The pentameride brachiopod genus Holorhynchus is a useful tool for correlation of the upper part of the Katian Stage in the Upper Ordovician. Holorhynchus occurs in the Boda Limestone, Siljan district, Sweden, but is generally only known from taxonomic descriptions. Here, we report in detail fossil occurrences relating morphology and sedimentary facies within the context of a major faunal turnover during the latest Katian. The specimens occur exclusively within the intercalated beds of pelmicritic mudstone and fossiliferous layers, which are down-slope storm deposits. The comparison of sedimentary features between the beds with and without Holorhynchus suggests that the animal inhabited fluid conditions on a muddy substrate, such as the channel environment reconstructed herein. The geological and autecological evidence suggests that the environmental conditions on the seabed were eutrophic. The opportunist Holorhynchus rapidly explored new habitats during a time of transition.

    DOI: 10.1080/11035897.2014.945619

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  • Hydrodynamic advantages in the free- living spiriferinide brachiopod Pachycyrtella omanensis: functional insight into adaptation to high- energy flow environments 査読

    Yuta Shiino, Lucia Angiolini

    LETHAIA47 ( 2 ) 216 - 228   2014年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Immobile benthic organisms lacking attachment or cementation mechanisms are considered to be best adapted to quiet bottom environments. Since the free-living Lower Permian spiriferinide brachiopod Pachycyrtella omanensis inhabited a sandy substrate with high-energy water flow, flume experiments were performed to show the possible hydrodynamic advantages of shell morphology in postural stability and generation of feeding flows. Modelling indicates that a vertical position, with the commissure plane perpendicular to the seabed, was the most unstable, although it is considered to have been its original life position. On the other hand, the passive flow inside the model in vertical position exhibited vortex movement with constant degree of inhalent flow and exhalent flow, conferring advantages on the effective filtration of food particles using a spiral lophophore. The intensity and movement of the passive flow for feeding could have been adjusted through changes in the angle of opening of the valves. As the shoreface habitat was affected by oscillatory flows, a small-sized animal could have undergone a high risk of burial, while an increase in size would have led to easier removal from the sandy bottom. To avoid both physical risks, Pachycyrtella developed a thick shell with a high rate of growth, specifically increasing the weight of the ventral umbo without altering its morphofunction to generate passive feeding flows. Biomechanics, functional morphology, opportunistic species, Pachycyrtella, Spiriferinida, suspension feeder.

    DOI: 10.1111/let.12052

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  • Pelagic or benthic? mode of life of the remopleuridid trilobite hypodicranotus striatulus 査読

    Yuta Shiino, Osamu Kuwazuru, Yutaro Suzuki, Satoshi Ono, Chihiro Masuda

    Bulletin of Geosciences89 ( 2 ) 207 - 218   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Czech Geological Survey  

    The mode of life of the remopleuridid trilobite Hypodicranotus striatulus Walcott (1875) was examined hydrodynami-cally with a special focus on the relationship between the autecological performances of swimming and feeding. To understand the effect of swimming height from the sea bottom on the hydrodynamic performance of the exoskeleton, we performed computational fluid dynamics simulations on four models at differing distances from the sea bottom. The results indicated that Hypodicranotus could launch itself from the sea bottom with a relatively strong hydrodynamic lift force from slow walking or swimming speeds. However, the lift force decreased as the swimming height increased at slow swimming speeds. Hence, Hypodicranotus would have had to increase its swimming speed to greater than 0.2 m/s and to obtain the most stable lift force at a swimming height equal to half of its own body height. Its exoskeletal morphology, with a forked hypostome, enabled it to launch itself at a slow velocity and swim at a modest distance, i.e., close to its own height, from the sea bottom. Feeding from the median vortex flows along the food groove between the two prongs of the hypostome may have been the best strategy near the sea bottom, where a large amount of food matter would have been available. Because arthropod musculature consists of striated muscles, which exhibit inferior endurance, Hypodicranotus most likely adapted to the near-bottom environment, where it could rest at times on the sea bottom as part of a nektobenthic mode of life.

    DOI: 10.3140/bull.qeosci.1409

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  • Swimming capability of the remopleuridid trilobite Hypodicranotus striatus: Hydrodynamic functions of the exoskeleton and the long, forked hypostome 査読

    Yuta Shiino, Osamu Kuwazuru, Yutaro Suzuki, Satoshi Ono

    JOURNAL OF THEORETICAL BIOLOGY300   29 - 38   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    The sophisticated hydrodynamic performance achieved by the exoskeleton and the long, forked hypostome of the remopleuridid trilobite Hypodicranotus striatus was demonstrated using image-based modelling and computational fluid dynamics simulation techniques. To understand the function of the long, forked hypostome, we examined two types of exoskeletal models, one with and one without the hypostome. We simulated the flow structures around the exoskeletal models under several ambient flow velocities to evaluate the shapes of the streamlines, the values of the drag and lift forces and the relevant coefficients acting on the models. The simulation results showed that the long, forked hypostome prevents the formation of a ventral vortex; thus, it stabilises the flow structure under all of the ambient velocities tested. Moreover, the hypostome functions to create positive lift, with stable lift coefficients observed under a wide range of velocities, and to reduce the drag coefficient as velocity increases. These results imply that the hypostome can reduce viscous drag with a modest lift force, which is an essential requirement for actively swimming animals. We conclude that the long, forked hypostome evolved to provide an active and stable swimming system, and we therefore hypothesise that Hypodicranotus exoskeletal morphology resulted from the adaptation to be a high-performance swimmer. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2012.01.012

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  • Ptycholophous lophophore in a productidine brachiopod

    Yuta Shiino, Shokei Yamada, Yutaro Suzuki, Chisato Suzuki

    PALEONTOLOGICAL RESEARCH15 ( 4 ) 233 - 239   2011年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    The internal morphology of the productide brachiopod Anidanthus ussuricus from the Middle Permian of the Takakurayama area, Fukushima Prefecture, Japan, shows an evident pattern of brachial ridges that are identified as a four-lobed ptycholophe of the feeding organ or lophophore. Because a ptycholophe has not previously been identified in productidines, we describe this structure to provide further insight into the morphology of the productide lophophore. A comparison of the lophophores between the productides and the extant thecideoids suggested that during the growth of productides, the disposition of a multilobed ptycholophe requires the development of elevated platform-like ridges or the enlargement of the dorsal valve, both of which provide greater area for the attachment of the lophophore. In contrast, the simple ptycholophe of Anidanthus is located on a faint relief of brachial ridges, which agrees with what has been observed fir the thecideoid ptycholophe. Because the productide shell form plays a role in the generation of passive feeding flows, it is expected that the productide feeding system, which supplies the energetic demands of the organism, would develop in response to the interaction between the lophophore and the overall shell form of productides.

    DOI: 10.2517/1342-8144-15.4.233

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  • The ideal hydrodynamic form of the concavo-convex productide brachiopod shell 査読

    Yuta Shiino, Yutaro Suzuki

    LETHAIA44 ( 3 ) 329 - 343   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    Water-flume experiments were performed to determine whether the concavo-convex Permian brachiopod Waagenoconcha imperfecta was hydrodynamically adapted for feeding. The generation of passive currents inside the valves was observed experimentally. The use of four transparent, hollow polyhedron models, each differing in a single morphological feature, permitted observation of the currents inside the valves and allowed evaluation of the hydrodynamic significance of the ears and the prominent geniculated trail. Regardless of the direction of ambient flow, only the approximate-imitation model generated a stable flow pattern consisting of inhalation from the ear gapes and exhalation from the anterior trail gape; models lacking or with small changes in these morphological features failed to generate stable flow patterns. The stable flow pattern was probably maintained by a pressure difference between the posterior lower ear gapes (maximum pressure) and the anterior trail gape (minimum pressure). Notably, bilaterally rotating internal currents formed parallel to the brachial ridges; such flow patterns would facilitate the capture of food particles by the animal via tentacles on its lophophore, which is most likely were located on the brachial ridges. Our results demonstrate that the immobile brachiopod W. imperfecta, an animal incapable of widely opening its valves, probably fed on the passive internal currents generated by its shell form. This unique valve morphology appears to be perfectly adapted from a hydrodynamic point of view.

    DOI: 10.1111/j.1502-3931.2010.00243.x

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  • Sedimentary history with biotic reaction in the Middle Permian shelly sequence of the Southern Kitakami Massif, Japan 査読

    Yuta Shiino, Yutaro Suzuki, Fumio Kobayashi

    ISLAND ARC20 ( 2 ) 203 - 220   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    The transition of sedimentary environments and their organism-related responses is exemplified in the active margin setting of the Middle Permian in the Southern Kitakami Massif. The transition in the sedimentary environment began with a shallowing-upward sequence at an upper slope to an outer shelf depositional setting that was associated with a delta system which transported abundant botanic remains in the Hoso-o Formation. By contrast, the sediments of the overlying Kamiyasse Formation, the base of which is roughly equivalent to the lowermost Capitanian, were deposited at a lower shoreface to the outer shelf setting, which originated from complex depositional sources, including beach, near shore reef mounds and a nearby independent area of shallow and hard substratum with a considerable difference of depth. This unique depositional setting resulted in the seemingly 'mixed' fauna associated with this formation. The depositional environment of the overlying Kurosawa Formation is similar to that of the Hoso-o Formation, but with far fewer monotonous biotic remains. A comparison of lithological characteristics and fossil remains with those of neighboring regions suggests that the independent mounds were generated as if the talus formed elsewhere so as to provide a large amount of skeletal elements to a deeper basin in the earliest Capitanian. Accordingly, the complex sedimentary setting observed in the Kamiyasse Formation occurs widely throughout the South Kitakami Massif, making possible the 'mixed' and seemingly diverse fauna from a mixture of multiple allochthonous origins.

    DOI: 10.1111/j.1440-1738.2011.00760.x

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  • Theoretical approach to the functional optimisation of spiriferide brachiopod shell: Optimum morphology of sulcus 査読

    Yuta Shiino, Osamu Kuwazuru

    JOURNAL OF THEORETICAL BIOLOGY276 ( 1 ) 192 - 198   2011年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    Evidence suggests that biological forms that provide physiological and autecological functions have evolved to adapt to environmental conditions and to optimise requisite morpho-functions. We examined whether shell morphology is functionally optimised to generate passive feeding flow in the Devonian spiriferide brachiopod Paraspinfer bownockeri. This study was based on quantitative results from a computational fluid dynamics simulation and the Lagrangian multiplier method. We estimated the optimum development of the ventral median shell depression, which is called the sulcus, by minimising the pressure difference along the gape. This estimation was made under the constraint that the number of spiral flow rotations must be greater than one, which is effective for spiriferide feeding because of its alignment with the spiral lophophore. During mathematical optimisation, the equation resulted in a suitable flow velocity of approximately 0.1 m/s. At this velocity, the pressure difference was minimised, regardless of sulcus development. The constraint equation showed that the number of spiral flow rotations increased with sulcus development. The optimal solution was similar to the original sulcus form of Paraspirifer under an ambient flow of approximately 0.1 m/s. This result suggests that the variation of shell outline in spiriferids could provide a variety of preferential conditions for ambient flow and that the flow intensity could be adjusted by sulcus development to generate a robust passive feeding flow along the spiral feeding organs. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2011.02.004

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  • ホウズキチョウチンの行動 : 微小砕屑物に着底した固着生物の生存戦略

    椎野 勇太, 北沢 公太

    日本ベントス学会誌 = Japanese journal of benthology65 ( 1 ) 18 - 26   2010年7月

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    記述言語:日本語   出版者・発行元:日本ベントス学会誌編集委員会  

    DOI: 10.5179/benthos.65.18

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  • Functional adaptation of spiriferide brachiopod morphology 査読

    Y. Shiino, O. Kuwazuru

    JOURNAL OF EVOLUTIONARY BIOLOGY23 ( 7 ) 1547 - 1557   2010年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    It has been suggested that spiriferide morphologies have evolved to adapt to a variety of environmental conditions. Through a computational fluid dynamics approach, we examined how the spiriferide original form was optimized for a lotic condition, specifically addressing the functionalization of the Devonian spiriferide brachiopod Paraspirifer bownockeri to generate passive feeding flows. The results using four models, each of which differed in the development of the spiriferide shell depression, i.e. sulcus, showed that a deeper sulcus functions to create strong spiral flows so as to align on the feeding organ inside the shell. Among the sulcus-developed models, only the mimic of the natural form could generate comparative slow flows with a stable inflow area. The fossil record of spiriferides shows a morphological trade-off between the development of the sulcus and wing form. We concluded that spiriferide shells with such a morphological combination evolved to produce various feeding strategies, resulting in diversification.

    DOI: 10.1111/j.1420-9101.2010.02024.x

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  • CT画像を用いた化石の内部構造の復元:スピリファー類の腕骨形態の例

    椎野勇太, 桑水流理, 吉川暢宏

    化石 ( 87 ) 1-2   2010年3月

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    記述言語:日本語  

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  • Middle Permian echinoconchoide brachiopod Vediproductus in the Kamiyasse area, Southern Kitakami Mountains, northeast Japan

    Yuta Shiino

    PALEONTOLOGICAL RESEARCH13 ( 3 ) 251 - 258   2009年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    Three species of the Middle Permian echinoconchoide brachiopod Vediproductus from the Kamiyasse area, northeast Japan, V mugenjin sp. nov., V punctatiformis, and V. sp., are described, and their paleogeographic significance is discussed. V mugenjin sp. nov. is characterized as having spine bands on both the outer and inner surface of the valve, showing a strong relief with a comparatively wide interval of each band and a typical sawtooth outline of spine bands in cross-sectional view. The stratigraphic and paleogeographic distributions suggest that the genus flourished in the Tethyan province and was possibly restricted to a lower latitude than warm-cool water transitional environment.

    DOI: 10.2517/1342-8144-13.3.251

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  • Computational fluid dynamics simulations on a Devonian spiriferid Paraspirifer bownockeri (Brachiopoda): Generating mechanism of passive feeding flows 査読

    Yuta Shiino, Osamu Kuwazuru, Nobuhiro Yoshikawa

    JOURNAL OF THEORETICAL BIOLOGY259 ( 1 ) 132 - 141   2009年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    A mechanism of generating passive feeding flow for the Devonian spiriferide brachiopod Paraspirifer bownockeri was theoretically elucidated through fluid dynamics simulations for flow around rigid shells. The RANS equations were used as a turbulence model, and the unsteady incompressible flow was solved using the finite volume method. Two directions of ventral and dorsal flows were investigated as typical cases where little exchange flow occurs inside the shells. The digital model of the shell was constructed using image processing of X-ray CT images of a shell replica made by molding a polycarbonate plate to a well-preserved fossil specimen of Paraspirifer. To examine the effect of flow velocity, three conditions of ambient flow velocity were adopted for both the ventral and dorsal flows. The pressure distribution along the gape showed that a relatively high pressure occurred around the sulcus in all simulated cases. This high pressure generated inflow from the sulcus and subsequent spiral internal flow, especially in fast ambient flows. This means that the sulcus generated the considerable pressure gradient around the gape passively and generated the stable intake of seawater and a spiral flow of water inside the shell for feeding. We conclude that the shell form of certain spiriferides could generate spiral flows so as to promote passive feeding, and the sulcus is interpreted as an important form for the passive intake of water. (C) 2009 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2009.02.018

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  • Middle Permian (Midian) foraminifers of the Kamiyasse Formation in the Southern Kitakami Terrane, NE Japan 査読

    Fumio Kobayashi, Yuta Shiino, Yutaro Suzuki

    PALEONTOLOGICAL RESEARCH13 ( 1 ) 79 - 99   2009年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    A refined foraminiferal biostratigraphy of the Middle Permian Kamiyasse Formation in the Kamiyasse area north of Kesennuma, Southern Kitakami Terrane, NE Japan, is presented. Based on the stratigraphic distribution of schwagerinid and neoschwagerinid fusulinoideans, the Kamiyasse Formation, equivalent to the Kanokura Formation in the type area (Setamai-Yahagi area), is subdivided into the Monodiexodina sutchanica, Parafusulina motoyoshiensis and Lepidolina shiraiwensis Zone in ascending order, all of which appear to correspond to the Midian (latest Wordian to Capitanian) in age. The M. sutchanica Zone is here defined as integrated with cross-stratified sandstone beds in the bottom of the formation, and this zone is no longer equivalent to the previously defined M. matsubaishi (junior synonym of M. sutchanica) Zone in the Iwaizaki Limestone and the Kanokura Formation of the type area. The other two zones are defined with the first occurrences of the zonal species. Foraminifers are highly diverse along the stratigraphic interval between the Parafusulina motoyoshiensis and Lepidolina shiraiwensis Zones. Fifty-seven species belonging to 42 genera of foraminifers are identified. Nineteen species among them are systematically described and discussed, including the following three species: Baisalina rikuzenensis sp. nov., whose middle and later whorls are subdivided into more than fifteen chamberlets by septal protrusions; Wutuella sp., previously misidentified as "Cancellina" sp.; and Septagathammina sp., exclusively known from South China.

    DOI: 10.2517/1342-8144-13.1.079

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  • Stratigraphy, carbonate facies and trilobite associations in the Hirnantian part of the Boda Limestone, Sweden 査読

    Yutaro Suzuki, Yuta Shiino, Jan Bergstrom

    GFF131 ( 4 ) 299 - 310   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:TAYLOR & FRANCIS LTD  

    The Hirnantian (Upper Ordovician) sequence of the Boda Limestone is defined and described as a new formal Upper Boda Member. It has four petrologically distinct, bedded units containing three strikingly different trilobite faunas. These differences are thought to be caused by a sea-level lowering leading to the first Hirnantian sea-level lowstand and successive transgression as well as to shifts in sea-water chemistry. This is indicated by the occurrence of a level with botryoidal carbonate cement. On top follows the upper Hirnantian Glisstjarn Formation.

    DOI: 10.1080/11035890903452670

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  • 南部北上山地上八瀬地域の中部ペルム系細尾層から産出したフズリナ化石とその意義

    椎野勇太, 鈴木雄太郎, 小林文夫

    地質学雑誌114 ( 4 ) 200 - 205   2008年4月

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  • Articulatory and musculatory systems in a Permian concavo-convex brachiopod Waagenoconcha imperfecta Prendergast, 1935 (Productida, Brachiopoda)

    Yuta Shiino, Yutaro Suzuki

    Paleontological Research11 ( 3 ) 265 - 275   2007年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Palaeontological Society of Japan (PSJ)  

    The valve opening system of the Permian concavo-convex productid brachiopod Waagenoconcha imperfecta is discussed in reference to the mode of the valve articulatory system and the reconstructed musculatory system. The analysis of the articulatory system suggests that it could open to a maximum angle of 6 degrees. The characters that seem to have played the most important roles in that process are: (1) narrow ginglymus, (2) overhanging beak above the dorsal valve, and (3) relatively narrow interior space in the posterior ventral valve, which provides little space for rotating the cardinal process and in result prevents excessive shell opening. For reconstruction of the musculatory system in productide, the relationship between the contracting direction of the adductor muscles and its mode of attachment to the dorsal valve was examined in well preserved specimens of W. imperfecta. The furrows of the attachment scars are cup-shaped, and their axes are concordant to the direction of adductor contraction. This structural relationship indicates that the paired anterior and posterior muscle scars in the median sulcus represent the attachment sites of the adductor and the diductor, respectively. The reconstructed musculatory system is fairly similar to that of the extant terebratulides. The "scars" that were thought in previous studies to be the places for attachment of the massive and powerful diductor muscle in productides seem to be the imprints of the mantle canal on the interior ventral valve. All this suggests that the previous interpretation claiming that productides could open and dose valves actively, should be abandoned. © by the Palaeontological Society of Japan.

    DOI: 10.2517/1342-8144(2007)11[265:AAMSIA]2.0.CO;2

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書籍等出版物

  • 見る目が変わる博物館の楽しみ方: 生物・鉱物・考古学を学ぶ (BERET SCIENCE)

    矢野 興一( 担当: 共著)

    ベレ出版  2016年10月  ( ISBN:9784860644901

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    総ページ数:435  

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  • 凹凸形の殻に隠された謎: 腕足動物の化石探訪 (フィールドの生物学)

    椎野 勇太( 担当: 単著)

    東海大学出版会  2013年7月  ( ISBN:4486018494

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    総ページ数:268  

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  • 東大古生物学―化石からみる生命史

    佐々木猛智, 伊藤泰弘, 佐々木 猛智, 伊藤 泰弘( 担当: 分担執筆 ,  範囲: 第3章:古生物年表.第4章:機能形態学からバイオメカニクス,進化古生物学へ.第11章:水中へ進出した三葉虫のバイオメカニクス.第12章:腕足動物の摂食戦略に基づく進化形態学.)

    東海大学出版会  2012年10月  ( ISBN:4486019652

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    総ページ数:390  

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  • 化石コレクション10 (朝日ビジュアルシリーズ)

    朝日新聞出版

    朝日新聞出版  2010年5月  ( ISBN:4023111309

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    総ページ数:14  

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MISC

  • 三葉虫ハイポディクラノタスの遊泳性能と古生態

    椎野勇太, 桑水流理, 鈴木雄太郎, 増田智洋

    バイオエンジニアリング講演会講演論文集27th   365 - 366   2015年1月

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    記述言語:日本語  

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  • かたちの微小変化に伴う機能とその最適性

    椎野勇太, 桑水流理

    日本古生物学会例会講演予稿集161st   28   2012年1月

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    記述言語:日本語  

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  • 遊泳性三葉虫の骨格形態を用いた流体力学的研究

    椎野勇太, 桑水流理, 鈴木雄太郎, 大野悟志

    日本古生物学会年会講演予稿集2011   22   2011年6月

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  • 機能要求に相応した設計原理を示唆する形態進化仮説:凹凸形態型腕足類の例

    椎野勇太, 山田翔慧, 鈴木雄太郎, 鈴木千里

    日本古生物学会例会講演予稿集160th   56   2011年1月

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  • Comparative experimental and simulation study on passive feeding flow generation in <I>Cyrtospirifer</I>

    Yuta Shiino, Osamu Kuwazuru

    Memoirs of the Association of Australasian Paleontologists41   1 - 8   2011年

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  • スピリファー類の「翼」に隠された機能的革新

    椎野勇太, 桑水流理

    日本古生物学会年会講演予稿集2010   35   2010年6月

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    記述言語:日本語  

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  • スピリファー類の採餌戦略

    椎野勇太

    日本古生物学会例会講演予稿集158th   24   2009年1月

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    記述言語:日本語  

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  • 腕足類の受動的採餌流を例にした流水実験と流体解析の比較研究

    椎野勇太, 桑水流理, 吉川暢宏

    日本古生物学会年会講演予稿集2008   63   2008年7月

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    記述言語:日本語  

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  • スピリファー腕足類の形態を用いた数値流体解析

    椎野勇太, 桑水流理, 吉川暢宏

    日本古生物学会年会講演予稿集2008   18   2008年7月

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  • 絶滅生物スピリファーの受動的採餌流形成メカニズムに関する数値流体力学的検討

    椎野 勇太, 桑水流 理, 吉川 暢宏

    計算工学講演会論文集13 ( 2 ) 531 - 532   2008年5月

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    記述言語:日本語  

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  • 絶滅腕足類の化石を用いた殻まわりのイメージベース流体解析

    椎野勇太, 桑水流理, 吉川暢宏

    バイオエンジニアリング講演会講演論文集20th   61-62   2008年1月

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  • 固着領域の安定性による有関節型腕足類の行動生態:肉茎による運動と機能

    椎野勇太

    日本ベントス学会・日本プランクトン学会合同大会講演要旨集2007   49   2007年9月

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受賞

  • 第2013年年会優秀ポスター賞

    2013年6月   日本古生物学会   遊泳性三葉虫Remopleurides複眼:転輪羅針儀機能発現か?

    増田智洋, 鈴木雄太郎, 大野悟志, 椎野勇太

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  • 第160回例会優秀ポスター賞

    2011年1月   日本古生物学会   機能要求に相応した設計原理を示唆する形態進化仮説:凹凸形態型腕足類の例

    椎野勇太, 山田翔慧, 鈴木雄太郎, 鈴木千里

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  • The Award of the Alwyn Williams

    2010年2月   The 6th International Brachiopod Congress  

    椎野勇太

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  • 日本古生物学会論文賞

    2008年7月   日本古生物学会   Articulatory and musculatory systems in a Permian concavo-convex brachiopod Waagenoconcha imperfecta Prendergast, 1935 (Productida, Brachiopoda)

    椎野勇太, 鈴木雄太郎

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共同研究・競争的資金等の研究

 

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