Researcher Database

Tsuyoshi Abe
Hokkaido University Museum
Associate Professor

Researcher Profile and Settings

Affiliation

  • Hokkaido University Museum

Job Title

  • Associate Professor

J-Global ID

Research Interests

  • ウラソゾ   日本海   マレーシア   フジマツモ科   系統分類学   含ハロゲン二次代謝産物   ソゾ属   海藻   halogenated secondary metabolites   Laurencia   marine benthic algae   chemotaxonomy   対馬暖流   サハリン   種内分化   サクランボ小体   ケミカルレース   rbcL   分子系統   Chondrophycus   

Research Areas

  • Life sciences / Biodiversity and systematics

Academic & Professional Experience

  • 2019/06 - Today Hokkaido University
  • 2012/11 - 2019/05 Hokkaido University
  • 2007/04 - 2012/10 Hokkaido University
  • 1998/08 - 2007/03 Hokkaido University

Education

  • 1993/04 - 1998/03  Hokkaido University
  • 1991/04 - 1993/03  Hokkaido University
  • 1987/04 - 1991/03  Hokkaido University  School of Science

Association Memberships

  • 北海道海洋生物科学研究会   国際藻類学会   日本藻類学会   北海道植物学会   Research Group for Hokkaido Marine Biological Sciences   International Phycological Society   The Japanese Society of Phycology   The Botanical Society of Hokkaido   

Research Activities

Published Papers

  • A new record of the marine red alga Laurencia snackeyi from Japan and its chemotaxonomic significance
    Ishii, T, Hisada, W, Abe, T, Kikuchi, N, Suzuki, M
    Records of Natural Products 14 (2) 150 - 153 2020 [Refereed][Not invited]
  • Takahiro Ishii, Yuto Shinjo, Miyu Miyagi, Hiroshi Matsuura, Tsuyoshi Abe, Norio Kikuchi, Minoru Suzuki
    Records of Natural Products Articles 13 (1) 81 - 84 2019/01 [Refereed][Not invited]
  • Takahiro Ishii, Miyu Miyagi, Yuto Shinjo, Yu Minamida, Hiroshi Matsuura, Tsuyoshi Abe, Norio Kikuchi, Minoru Suzuki
    Natural Product Research 1478-6419 2019 [Refereed][Not invited]
  • Suttikarn Sutti, Masaya Tani, Yukimasa Yamagishi, Tsuyoshi Abe, Kathy Ann Miller, Kazuhiro Kogame
    Phycologia 57 (3) 262 - 272 2330-2968 2018/03/15 [Refereed][Not invited]
     
    Using morphological and molecular evidence, we describe a new genus, Neochondria, based on specimens formerly identified as 'Chondria tenuissima' sensu Okamura in Japan. The generitype, Neochondria ammophila sp. nov., is not closely related to Chondria capillaris (Hudson) M.J. Wynne, the generitype of Chondria. The anatomy of Neochondria differs from that of Chondria by the development of adventitious elongate cells between the five major pericentral cells, forming densely compact layers surrounding the axial strand, even in the ultimate branchlets. We propose the new combination, Neochondria nidifica, based on Chondria nidifica Harvey from California, USA and Baja California, Mexico. Multigene analyses (rbcL, small subunit and cox1) and morphological observations demonstrated that N. ammophila and N. nidifica share a clade but preliminary results show that they may not belong in the tribe Chondrieae.
  • 浅海域生物相調査 II. 海藻相
    阿部剛史, 江口暁彦, 松浦裕志, 南田悠, 鈴木稔, 野別貴博, 酒巻一修
    平成29(2017)年度知床半島における浅海域生物相調査及び貝類定量調査報告書 62 - 72 2018 [Not refereed][Not invited]
  • Takanori Kuribayashi, Tsuyoshi Abe, Shigeru Montani
    PLOS ONE 12 (7) e0180760  1932-6203 2017/07 [Refereed][Not invited]
     
    Historically Saccharina spp. beds occurred along the west coast of Hokkaido, an oligotrophic area, and were commercially exploited. Currently extensive commercial Saccharina spp. beds do not form due to nutrient limitations. Here, we postulate that nutrients assimilated by paleo-Saccharina spp. beds may have been derived from spawning herrings (Clupea pallasii) acting as organisms that formed a vector from their feeding grounds (Okhotsk Sea and Pacific Ocean) to their spawning area (west coast of Hokkaido, Japan Sea). To test this hypothesis we examined stable nitrogen isotope ratios (delta N-15) of 100-to 135-year-old Saccharina specimens preserved at the Herbarium (Hokkaido University Museum). delta(15) N values of the paleo-Saccharina specimens collected from this region were in the range of 10%, which is significantly higher than the current 3-7% in freshly sampled Saccharina spp. This high delta(15) N indicates that spawning herring (Clupea pallasii) had potentially been a significant source of dissolved inorganic nitrogen (DIN) absorbed by Saccharina, acting as an organism forming a vector for transporting nutrients from eutrophic to oligotrophic coastal ecosystems. Our findings support the hypothesis of so-called "herring-derived nutrients."
  • Norishige Yotsukura, Takashi Maeda, Tsuyoshi Abe, Masahiro Nakaoka, Tadashi Kawai
    JOURNAL OF APPLIED PHYCOLOGY 28 (5) 3043 - 3055 0921-8971 2016/10 [Refereed][Not invited]
     
    The genetic diversity of Saccharina japonica inhabiting the Hokkaido coastline and the surrounding area was investigated by AFLP and SSR analyses. A STRUCTURE analysis based on the AFLP data identified two clusters in the species, although a few local populations with genetic structures different from that of the neighboring populations were detected. The two clusters could be identified even within each current variety. In the SSR analysis, genetic variation in nucleotide sequences in all samples was located in four DNA regions (MS10, MS11, MS16, and MS29), and it is thought that these regions can be used as markers to detect individual-level variation in S. japonica. The STRUCTURE analysis of the SSR data identified four clusters in the species. Since the geographical distribution of these four different clusters does not correspond exactly to the currently recognized varieties in this species, it will be necessary to re-evaluate the distribution of the varieties of S. japonica.
  • Masahiro Suzuki, Takahiro Segawa, Hiroshi Mori, Ayumi Akiyoshi, Ryo Ootsuki, Akira Kurihara, Hidetoshi Sakayama, Taiju Kitayama, Tsuyoshi Abe, Kazuhiro Kogame, Hiroshi Kawai, Hisayoshi Nozaki
    PLOS ONE 11 (7) e0158944  1932-6203 2016/07 [Refereed][Not invited]
     
    Liagora japonica is a red algal species distributed in temperate regions of Japan. This species has not been collected from its type locality on the Pacific coast of Japan since 1927 and seems to have become extinct in this area. For molecular characterization of L. japonica, we extracted DNA from the topotype material of L. japonica collected in 1927, analyzed seven genes using Illumina next-generation sequencing, and compared these data with sequences from modern samples of similar red algae collected from the Japan Sea coast of Japan. Both morphological and molecular data from modern samples and historical specimens (including the lectotype and topotype) suggest that the specimens from the Pacific and Japan Sea coasts of Japan should be treated as a single species, and that L. japonica is phylogenetically separated from the genus Liagora. Based on the phylogenetic results and examination of reproductive structures, we propose Otohimella japonica gen. et comb. nov., characterized morphologically by diffuse carposporophytes, undivided carposporangia, and involucral filaments initiated only from the cortical cell on the supporting cell.
  • Kousuke Yaegashi, Yukimasa Yamagishi, Shinya Uwai, Tsuyoshi Abe, Wilfred John Eria Santianez, Kazuhiro Kogame
    BOTANICA MARINA 58 (5) 331 - 343 0006-8055 2015/10 [Refereed][Not invited]
     
    The brown algal genus Acinetospora is characterised by sparsely branched uniseriate filaments, scattered meristematic zones, short laterals ("crampons") and scattered reproductive organs. The morphology and life history of the generitype A. crinita have been studied repeatedly, and accounts of the species' highly varied reproductive patterns were assumed to be due to the presence of multiple taxa that were reported under this name. Herein, we attempt to contribute to the taxonomy of the genus by conducting morphological and culture studies on 33 Acinetospora samples collected from Japan. We recognised two Acinetospora species and propose to name them A. filamentosa comb. nov. and A. asiatica sp. nov. These two species are distinguished from A. crinita by the absence of monosporangia and plurilocular acinetosporangia/megasporangia. Acinetospora filamentosa and A. asiatica have similar vegetative morphologies but possess different reproductive patterns. The former forms unilocular sporangia on erect filaments and both unilocular sporangia and plurilocular zoidangia on prostrate filaments, while the latter forms plurilocular zoidangia only on both erect and prostrate filaments. Molecular analyses based on rbcL and cox1 genes supported independence of these species.
  • Taiki Umezawa, Yuko Oguri, Hiroshi Matsuura, Shohei Yamazaki, Masahiro Suzuki, Erina Yoshimura, Takeshi Furuta, Yasuyuki Nogata, Yukihiko Serisawa, Kazuyo Matsuyama-Serisawa, Tsuyoshi Abe, Fuyuhiko Matsuda, Minoru Suzuki, Tatsufumi Okino
    ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 53 (15) 3909 - 3912 1433-7851 2014/04 [Refereed][Not invited]
     
    Natural antifouling products have been the subject of considerable attention. We screened marine algae for antifouling activity and discovered omaezallenes, the new bromoallene-containing natural products isolated from the red alga Laurenciasp. Described is the isolation, structure elucidation, and total syntheses of omaezallenes. The relative and absolute configurations of natural omaezallenes were unambiguously established through total synthesis. The antifouling activities and ecotoxicity of omaezallenes were also evaluated.
  • Marine Benthic Macroalgae Survey 2010-2012 around Shikotan, Itrup and Kunashir Islands
    Abe, T
    Biodiversity and Biogeography of the Kuril Islands and Sakhalin 4 69 - 73 2014 [Refereed][Not invited]
  • Yukimasa Yamagishi, Yusuke Ohta, Michio Masuda, Tsuyoshi Abe
    PHYCOLOGICAL RESEARCH 62 (1) 63 - 72 1322-0829 2014/01 [Refereed][Not invited]
     
    A new red alga, Dasya enomotoi, is described from Japan. This species is characterized by having a large thallus consisting of an elongated axis and many, radially arranged, polysiphonous branches both of which are heavily corticated and densely covered with numerous, soft monosiphonous filaments. It is distinguished from several similar species by the combination of the following: (i) indistinct pericentral cells in transverse sections except near the apices, (ii) the presence of enlarged, inner cortical cells, (iii) radially arranged adventitious monosiphonous filaments, (iv) three-celled carpogonial branches, (v) six (sometimes five) tetrasporangia in each fertile segment of the stichidia, and (vi) three tetrasporangial cover cells that are not elongated longitudinally and usually not divided transversely. This species may have been identified as D.villosa Harvey by previous investigators in Japan.
  • Nutritional Status of Seaweed Communities along the West Coastof the Japan Sea off Hokkaido, Japan, from Monitoring Data and Detecting δ15N Records in Saccharina Specimens
    Kuribayashi, T, Abe, T, Montani, S
    Bulletin on Coastal Oceanography 52 (1) 75 - 81 2014 [Refereed][Not invited]
  • T. Ohta, Y. Mahara, T. Kubota, T. Abe, H. Matsueda, T. Tokunaga, S. Sekimoto, K. Takamiya, S. Fukutani, H. Matsuzaki
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 294 559 - 562 0168-583X 2013/01 [Refereed][Not invited]
     
    The iodine isotopes I-127 and I-129 were isolated from marine algal samples to obtain I-129/I-127 ratios by accelerator mass spectrometry (AMS). The collection efficiency of iodine was 16%-99%, and the treatment temperature in the present study was lower than that used in conventional methods for I-129 analysis. Using the separation method reported here, we can easily measure ultra-low I-129/I-127 ratios in the orders of magnitude of 10(-13)-10(-12), which were observed in algal samples from the pre-nuclear era (before 1945). The I-129/I-127 ratios observed in algae collected from 1929 to 1987 ranged from 10(-13) to 10(-10). The I-129/I-127 ratio in algae collected in 1987 was 100-1000 times as high as the ratio measured in algae collected before 1945. This dramatic increase in I-129/I-127 ratio after 1945 is attributed to human activity. (C) 2012 Elsevier B.V. All rights reserved.
  • Hiroki Takahashi, Yoshinori Takahashi, Minoru Suzuki, Tsuyoshi Abe, Michio Masuda
    ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE 66 O1795 - U517 1600-5368 2010/07 [Refereed][Not invited]
     
    The title compound {systematic name: (1R,4S,4aS,7R,8aR)-4-bromo-7-[(1S,3R)-3-bromo-1,2,2-trimethylcyclopentyl]-1,4a-dimethyldecahydronaphthalene-1,7,8a-triol}, C(20)H(34)Br(2)O(3), is a neoirieane-type bromoditerpenoid isolated from Laurencia yonaguniensis Masuda et Abe, species inedita. The absolute stereochemistry was established as (1S,4R,5R,7R,10S,11S,14R). The structure displays inter-and intramolecular O-H center dot center dot center dot O hydrogen bonding.
  • Akira Kurihara, Tsuyoshi Abe, Masaya Tani, Alison R. Sherwood
    JOURNAL OF PHYCOLOGY 46 (3) 580 - 590 0022-3646 2010/06 [Refereed][Not invited]
     
    A molecular phylogenetic study of red algal parasites commonly found in the Northwestern Pacific and the Hawaiian Islands was undertaken. Four species, Benzaitenia yenoshimensis Yendo, Janczewskia hawaiiana Apt, J. morimotoi Tokida, and Ululania stellata Apt et Schlech (Ceramiales), are parasitic on rhodomelacean species belonging to the tribes Chondrieae and Laurencieae. Although Janczewskia and Ululania are classified in the same tribes as their host species, the taxonomic placement of Benzaitenia has been controversial. To infer the phylogenetic positions of these parasites and to clarify the relationships between the parasites and their hosts, phylogenetic analyses of partial nuclear SSU and LSU rRNA genes and the cox1 gene were performed. The SSU rRNA gene analyses clearly show that both Janczewskia species are positioned within the Laurencia s. str. clade with their host species, while Benzaitenia and Ululania are placed in the Chondrieae clade. According to these analyses, J. hawaiiana and U. stellata are not sister to their current hosts; in contrast, B. yenoshimensis and J. morimotoi are closely related to their current hosts. These data suggest that J. hawaiiana and U. stellata have likely evolved from species other than their current hosts and have switched hosts at some point in their evolutionary history. Likelihood ratio tests do not support the monophyly of J. hawaiiana and J. morimotoi, suggesting multiple origins of parasitism within Laurencia s. str.
  • 知床半島沿岸域における浅海域の生物相 2) 海藻相
    阿部剛史, 小亀一弘, 野別貴博
    平成21(2009)年度知床世界自然遺産地域生態系モニタリング調査業務報告書 477 - 488 2010 [Not refereed][Not invited]
  • Reproductive phenology of three species of Gracilaria: G. blodgettii Harvey, G. vermiculophylla (Ohmi) Papenfuss and G. salicornia (C. Agardh) Dawson (Gracilariales, Rhodophyta) from Okinawa, Ryukyu Islands, Japan
    Terada, R. Abe, T, Kawaguchi, S
    Coastal Marine Science 34 (1) 129 - 134 2010 [Refereed][Not invited]
  • Minoru Suzuki, Yoshinori Takahashi, Satoru Nakano, Tsuyoshi Abe, Michio Masuda, Toshiyuki Ohnishi, Yoichi Noya, Koh-ichi Seki
    PHYTOCHEMISTRY 70 (11-12) 1410 - 1415 0031-9422 2009/07 [Refereed][Not invited]
     
    The production of labeled brominated metabolites with radioactive (82)Br in Laurencia species was investigated as part of a study of the biosynthesis of halogenated metabolites from species belonging to the red algal genus Laurencia (Rhodomelaceae, Ceramiales). Radiobromide [(82)Br], thin-layer chromatography (TLC), and TLC-autoradioluminography (ARLG) were used. When cultured in artificial seawater medium (ASP(12)NTA including Na(82)Br) under 16:8 h light:dark (LD) illumination cycles for 24 h, each of the strains of Laurencia, Laurencia japonensis Abe et Masuda, Laurencia nipponica Yamada (laurencin-producing race and laureatin-producing race), and Laurencia okamurae Yamada, produced species- (or race-) specific (82)Br-containing metabolites. In the case of the laurencin-producing race of L nipponica, laurencin and deacetyllaurencin were found to be produced in approximately 1:1 ratio, though laurencin is the major metabolite in the wild sample. Furthermore, when cultured in the dark, the production rates of brominated metabolites in Laurencia spp. were found to be diminished. The present study strongly indicates that the use of radiobromine [(82)Br] in combination with the TLC-ARLG method is an effective approach for investigating the biosynthesis of brominated metabolites in Laurencia. (C) 2009 Elsevier Ltd. All rights reserved.
  • 知床半島沿岸域における浅海域の生物相 ii.海藻相
    阿部剛史, 小亀一弘, 野別貴博
    平成20年度知床半島沿岸における浅海域生物相調査業務報告書 15 - 25 2009/03 [Not refereed][Not invited]
  • Charles Santhanaraju Vairappan, Minoru Suzuki, Takahiro Ishii, Tatsufumi Okino, Tsuyoshi Abe, Michio Masuda
    PHYTOCHEMISTRY 69 (13) 2490 - 2494 0031-9422 2008/10 [Refereed][Not invited]
     
    During our studies on Malaysian Laurencia species, brominated metabolites, tiomanene, acetylmajapolene B, and acetylmajapolene A were isolated from an unrecorded species collected at Pulau Tioman, Pahang along with known majapolene B and majapolene A. Acetylmajapolene A was a mixture of diastereomers as in the case of majapolene A. Tiomanene may be a plausible precursor for acetylmajapolenes B and A. In addition, three known halogenated sesquiterpenes and two known halogenated C(15) acetogenins were found from other two unrecorded species collected at Pulau Karah, Terengganu and Pulau Nyireh, Terengganu, respectively. Some of these halogenated metabolites showed moderate antibacterial activity against some marine bacteria. (c) 2008 Elsevier Ltd. All rights reserved.
  • 知床半島沿岸域における浅海域の生物相 2.海藻相
    阿部剛史, 小亀一弘, 野別貴博
    平成19年度知床半島沿岸における浅海域生物相調査業務報告書 15 - 22 2008/03 [Not refereed][Not invited]
  • A systematic re-examination of four Laminaria species: L. japonica, L. religiosa, L. ochotensis and L. diabolica
    Yotsukura, N, Kawashima, S, Kawai, T. Abe, T, Druehl, L.D
    The Journal of Japanese Botany 83 (3) 165 - 176 2008 [Refereed][Not invited]
  • 知床沿岸における浅海域の生物相調査 III.海藻相
    阿部剛史, 野別貴博
    平成18年度知床世界自然遺産地域生態系モニタリング調査業務報告書 90 - 94 2007/03 [Not refereed][Not invited]
  • List of marine algae from Tanetomi, Rishiri Island, Hokkaido, Japan on 2004
    川井唯史, 赤池章一, 佐藤雅彦, 阿部剛史, 四ツ倉典滋
    利尻研究 26 (4) 31 - 34 2007 [Refereed][Not invited]
  • Hiroki Takahashi, Yoshinori Takahashi, Minoru Suzuki, Tsuyoshi Abe, Michio Masuda
    Analytical Sciences: X-ray Structure Analysis Online 23 (6) x103 - x104 1348-2238 2007 [Refereed][Not invited]
     
    The title compound, neoirietetraol (C20H34Br2O4), was isolated from the Okinawan red alga Laurencia yonaguniensis. The crystal belongs to space group P21 with cell dimensions a=8.1048(1), b=15.3013(3), c=10.7455(3)Å and β=102.337(1)°. The absolute stereochemistry of the title compound was established as (1S, 4R, 5R, 7R, 10S, 11R, 12S, 14R). 2007 © The Japan Society for Analytical Chemistry.
  • Morphological and molecular phylogenetic studies of a red alga, Halymenia durvillei, (Halymeniaceae, Halymeniales) from Indo-Pacific
    Kawaguchi, S, Shimada, S, Abe, T, Terada, R
    Coastal Marine Science 30 (1) 201 - 208 2006 [Refereed][Not invited]
  • Marine algae of Akkeshi Daikokujima Isl. and Cape Erimo
    川井唯史, 石川慎也, 中岡利泰, 松本里子, 坂西芳彦, 阿部剛史, 四ツ倉典滋, 川嶋昭二
    えりも研究 3 (4) 1 - 4 2006 [Refereed][Not invited]
  • Preliminary report on the molecular phylogeny of the Laurencia complex (Rhodomelaceae)
    Abe, T, Kurihara, A, Kawaguchi, S, Terada, R, Masuda, M
    Coastal Marine Science 30 (1) 209 - 213 2006 [Refereed][Not invited]
  • M Suzuki, T Kawamoto, CS Vairappan, T Ishii, T Abe, M Masuda
    PHYTOCHEMISTRY 66 (23) 2787 - 2793 0031-9422 2005/12 [Refereed][Not invited]
     
    Further investigation of Laurencia species from Japanese waters, which were collected at three locations, yielded brominated metabolites, a labdane-type diterpene and a C-15 acetogenin possessing a terminal bromoallene group. Their structures were deduced from analysis of spectroscopic data. (c) 2005 Elsevier Ltd. All rights reserved.
  • Y Yamagishi, M Masuda, T Abe, S Uwai, K Kogame, S Kawaguchi, SM Phang
    BOTANICA MARINA 46 (6) 534 - 547 0006-8055 2003 [Refereed][Not invited]
     
    Hypnea cornuta (Kutzing) J. Agardh var. stellulifera J. Agardh (Hypneaceae, Gigartinales) is distinguished from the type variety by the short, thick, rigid axes that produce thick adventitious branchlets as well as the tetrasporangial sori and spermatangial sori that extend to the parental axis and branches. Var. stellulifera is raised to the rank of species as Hypnea stellulifera (J. Agardh) Yamagishi et Masuda on the basis of these morphological differences and comparative chloroplastencoded rbcL sequences. Reproductive structures of Heterosiphonia crispella (C. Agardh) Wynne (Dasyaceae, Ceramiales), which is referable to var. laxa (Borgesen) Wynne, are described. Two species of Laurencia (Rhodomelaceae, Ceramiales) are reported from Malaysia for the first time: L. pygmaea Webervan Bosse and L. majuscula (Harvey) Lucas. Critical features of L. pygmaea include four pericentral cells per segment, the presence of a single (rarely two) corps en cerise per superficial cortical cell, and the production of a single tetrasporangiumbearing pericentral cell on each fertile segment.
  • M Masuda, T Abe, K Kogame, S Kawaguchi, SM Phang, M Daitoh, T Sakai, M Takahashi, M Suzuki
    BOTANICA MARINA 45 (6) 571 - 579 0006-8055 2002/11 [Refereed][Not invited]
     
    Three species of the red algal genus Laurencia (Ceramiales, Rhodomelaceae) are reported from Malaysia for the first time: L. lageniformis Masuda, L. nangii Masuda and L. calliclada Masuda. Some morphological features regarding corps en cerise and spermatangial branches, which have been unknown for these species, are described. The occurrence of plural corps en cerise in individual trichoblast cells of L. nangii is the first report for the species of Laurencia, as some species have been reported to possess two to four (or more) corps en cerise in superficial cortical cells, but such species are known to contain only a single corps en cerise in trichoblast cells. Furthermore, halogenated secondary metabolite contents of these species are reported.
  • M Suzuki, Y Takahashi, Y Mitome, T Itoh, T Abe, M Masuda
    PHYTOCHEMISTRY 60 (8) 861 - 867 0031-9422 2002/08 [Refereed][Not invited]
     
    Two halogenated C-15 acetogenins, itomanallenes A and B, with a terminal bromoallene moiety along with a halogenated sesquiterpene, itomanol, have been isolated from the red alga Laurencia intricata collected in Okinawan waters. Their structures were deduced from 1D and 2D NMR experiments including H-1-H-1 COSY, HSQC, HMBC, and NOESY methods. The alcohol corresponding to itomanallene B seems to be a plausible precursor of itomanallene A, which has an unusual 2,10-dioxabicyclo[7.3.0]dodecene skeleton. Itomanol was found to be a selinane-type bromosesquiterpenoid, and is the first example of a selinane to be isolated from Japanese Laurencia species. (C) 2002 Elsevier Science Ltd. All rights reserved.
  • M Suzuki, S Nakano, Y Takahashi, T Abe, TAM Masuda, H Takahashi, K Kobayashi
    JOURNAL OF NATURAL PRODUCTS 65 (6) 801 - 804 0163-3864 2002/06 [Refereed][Not invited]
     
    From an unidentified species of Laurencia collected from Okinawan waters two novel brominated metabolites, 1 and 2, along with known halogenated compounds, 2,10-dibromo-3-chloro-alpha-chamigrene (3),and microcladallene A (4), were isolated and identified. The structures of these new compounds were established, as ent-labdane-type bromoditerpenes, (1S,3R,5S,6S,8S,9S,10R,13R)-1-acetoxy-3-bromo-6hydroxy-8,13-epoxy-labd-14-ene (1) and (3R,5S,6S,8S,9S,10R,13R)-3-bromo-6-hydroxy-8,13-epoxylabd14-en-1-one (2), by interpretation-of their spectroscopic data as well as by X-ray crystallographic analysis.
  • M Masuda, T Abe
    CRYPTOGAMIE ALGOLOGIE 23 (2) 107 - 121 0181-1568 2002/04 [Refereed][Not invited]
     
    Two different entities have been included in the alga passing under the name of Melanamansia glomerata (C. Agardh) R. Norris or Amansia glomerata C. Agardh in the north-western Pacific Ocean. An alga, which is characterised by the production of two pseudopericentral cells that are cut off from two dorsal pericentral cells towards the centre of the thallus and surround the axial cell together with five pericentral cells, is referred to genuine M. glomerata. Another alga, which lacks such pseudopericentral cells, is referred to Amansia rhodantha (Harvey) I Agardh. The two species are also distinguished by two further features: 1) thallus colour, dark brown in M. glomerata and dark red in A. rhodantha; and 2) the absence or presence of conspicuous midribs, absent in M. glomerata and present in A. rhodantha. However, diagnostic features between the genera Melanamansia and Amansia besides the presence/absence of pseudopericentral cells, such as development of serrations, the presence/absence of trichoblast capsules and transverse-sectional profiles of tetrasporangial stichidia, may vary in both genera and overlap each other. The pseudopericentral feature is only a reliable taxonomic criterion that distinguishes these two genera. These facts strongly indicate that Amansia and Melanamansia are congeneric, at least M. glomerata should be put back in Amansia, although it is desirable to conduct further studies including molecular analysis for reassessment of the status of the genus Melanamansia.
  • Y Takahashi, M Daitoh, M Suzuki, T Abe, M Masuda
    JOURNAL OF NATURAL PRODUCTS 65 (3) 395 - 398 0163-3864 2002/03 [Refereed][Not invited]
     
    A novel brominated diterpene based on the rare neoirieane skeleton, named neoirietetraol (1), has been isolated along with a halogenated C-15 acetogenin, (3Z)-laurenyne (2), from a new Laurencia species, L. yonaguniensis Masuda et Abe, species inedita, collected at Yonaguni Island, Okinawa Prefecture, Japan. The structures of these metabolites were elucidated by spectroscopic data (IR, H-1 NMR, C-13 NMR, 2D NMR, and MS). Neoirietetraol (1) was toxic to the brine shrimp (Altemia salina; LC50, 40.1 muM) and also showed weak antibacterial activities against two marine bacteria, Alcaligenes aquamarinus and Escherichia coli.
  • Michio Masuda, Shigeo Kawaguchi, Tsuyoshi Abe, Tomotake Kawamoto, Minoru Suzuki
    Phycological Research 50 (2) 135 - 144 1322-0829 2002 [Refereed][Not invited]
     
    The halogenated secondary metabolite constitution of four species of the red algal genus Laurencia (Rhodomelaceae) from southern Japan is reported. Laurencia composita Yamada from Tanegashima Island (Kagoshima Prefecture) bears five sesquiterpenoids (2,10-dibromo-3-chloro-α-chamigrene and 2,10-dibromo-3-chloro-9-hydroxy-α-chamigrene, in addition to prepacifenol epoxide, johnstonol and pacifenol, which are known in other populations of this species). Laurencia intricata Lamouroux from Chinzei (Saga Prefecture) and Oomura Bay (Nagasaki Prefecture) bear a C15 acetogenin, okamurallene. Laurencia majuscula (Harvey) Lucas from Tanegashima Island produces three sesquiterpenoids, (Z)-10,15-dibromo-9-hydroxy-chamigra-1, 3(15),7(14)-triene, 10-bromo-7-hydroxylaurene and 10,11-dibromo-7-hydroxylaurene, corresponding to those of one of its chemical races. Laurencia venusta Yamada from Tanegashima Island produces two sesquiterpenoids, cupalaurenol and cyclolaurenol, which were known only from a sea hare, Aplysia dactylomela Rang. This strongly suggests that Aplysia consumes L. venusta and concentrates these halogenated compounds.
  • CS Vairappan, M Suzuki, T Abe, M Masuda
    PHYTOCHEMISTRY 58 (3) 517 - 523 0031-9422 2001/10 [Refereed][Not invited]
     
    The chemical compositions of five species of the red algal genus Laurencia from coastal waters of Okinawa Prefecture, Japan, have been investigated. A halogenated C-15 acetogenin, (12E)-lembyne-A, was isolated front L. mariannensis, and a halogenated sesquiterpene, (6R,9R,10S)-10-bromo-9-hydroxy-chamigra-2,7(14)-diene, was first found from L. majuscula as a naturally occurring compound. Laurencia nidifica yielded previously known laurinterol and isolaurinterol. Samples of L. cartilaginea and L. concreta afforded no halogenated metabolites. The structures of these halogenated metabolites as well as their antibacterial activity against some marine bacteria are reported., (C) 2001 Elsevier Science Ltd. All rights reserved.
  • M Masuda, T Abe, S Kawaguchi, SM Phang
    BOTANICA MARINA 44 (5) 467 - 477 0006-8055 2001/09 [Refereed][Not invited]
     
    Five species of the red algal order Ceramiales are reported from Malaysia for the first time, and their characteristic features are described: three species of Hypoglossum (Delesseriaceae), H. rhizophorum Ballantine et Wynne, H. caloglossoides Wynne et Kraft and H. simulans Wynne, Price et Ballantine, and two species of Rhodomelaceae, Laurencia caduciramulosa Masuda et Kawaguchi and Neosiphonia savatieri (Hariot) M. S. Kim et L K. Lee. Small deciduous branchlets of Laurencia caduciramulosa are documented to be genuine propagules.
  • CS Vairappan, M Daitoh, M Suzuki, T Abe, M Masuda
    PHYTOCHEMISTRY 58 (2) 291 - 297 0031-9422 2001/09 [Refereed][Not invited]
     
    Two halogenated C-15 acetogenins, named lembyne-A and lembyne-B, have been isolated from an unrecorded Laurencia species collected off the Malaysian waters. Their structures were deduced on the basis of spectroscopic evidence. Previously known elatol and iso-obtusol showed potent antibacterial activity against some marine bacteria. (C) 2001 Elsevier Science Ltd. All rights reserved.
  • M Suzuki, M Daitoh, CS Vairappan, T Abe, M Masuda
    JOURNAL OF NATURAL PRODUCTS 64 (5) 597 - 602 0163-3864 2001/05 [Refereed][Not invited]
     
    In connection with our chemotaxonomic studies of Malaysian species of the red algal genus Laurencia, the chemical composition of Laurencia pannosa Zanardini was examined. Two halogenated sesquiterpenoids, named pannosanol (1) and pannosane (2), have been isolated along with a halogenated C-15- acetogenin, (3Z)-chlorofucin (3). The structures of these compounds were determined from their spectroscopic data (IR, H-1 NMR, C-13 NMR, 2D NMR, and MS). Pannosanol and pannosane are novel halometabolites with an unusual rearranged chamigrane framework. Antibacterial activities of these metabolites against marine bacteria are also described.
  • M Masuda, T Abe, S Kawaguchi, SM Phang
    BOTANICA MARINA 42 (5) 449 - 458 0006-8055 1999/09 [Refereed][Not invited]
     
    The following five species of marine red algae are reported from Malaysia for the first time and their characteristic features are described: Cryptonemia yendoi Weber-van Bosse (Halymeniaceae, Cryptonemiales), Caulacanthus ustulatus (Turner) Kutzing (Caulacanthaceae, Gigartinales), Chondracanthus intermedius (Suringar) Hommersand (Gigartinaceae, Gigartinales), Griffithsia schousboei Montagne (Ceramiaceae, Ceramiales) and Laurencia flexilis Setchell (Rhodomelaceae, Ceramiales). The presence of Anotrichium tenue (C. Agardh) Nageli (Ceramiaceae, Ceramiales) in Malaysia is confirmed. Chondracanthus okamurae Abbott, originally described from Japan, is reduced to the synonymy of C. intermedius.
  • M Suzuki, S Nakano, Y Takahashi, T Abe, M Masuda
    PHYTOCHEMISTRY 51 (5) 657 - 662 0031-9422 1999/07 [Refereed][Not invited]
     
    Two novel halogenated C-15 acetogenins, named bisezakyne-A and -B, have been isolated along with dactylyne from an undescribed species of the red algal genus Laurencia collected from Japan. The structures of these compounds were elucidated by spectroscopic data. (C) 1999 Elsevier Science Ltd. All rights reserved.
  • Y Takahashi, M Suzuki, T Abe, M Masuda
    PHYTOCHEMISTRY 50 (5) 799 - 803 0031-9422 1999/03 [Refereed][Not invited]
     
    Two brominated C-15 nonterpenoid compounds, japonenyne-A and -B, with a novel 2,7-dioxabicyclo[4.3.0]nonane skeleton have been isolated from the red alga Laurencia japonensis Abe et Masuda. The structures of these metabolites were deduced from spectral evidence. (C) 1999 Elsevier Science Ltd. All rights reserved.
  • Abe Tsuyoshi, Michio Masuda, Teruaki Suzuki, Minoru Suzuki
    Phycological Research 47 (2) 87 - 95 1322-0829 1999 [Refereed][Not invited]
     
    Genetic variation in the synthesis of halogenated secondary metabolites in the Japanese marine red alga Laurencia nipponica Yamada (Rhodomelaceae, Ceramiales) has been investigated in laboratory crossing experiments and chemical analyses. F1 tetrasporophytes and F1 gametophytes resulting from crosses within chemical races produced major metabolites characteristic of these races. F1 tetrasporophytes derived from reciprocal interracial crosses produced: (i) both parental types of secondary metabolites (ii) either of the parental types or (iii) a further major compound in addition to both parental types or in addition to either of the parental types. The latter cases suggest that hybrid-specific products were formed by the combined enzymatic complements of the parents, as F1 gametophytes derived from these interracial F1 tetrasporophytes yielded one or other of their parental products in an approximate 1:1 ratio. The population structure was analyzed at localities in Hokkaido, where two of the chemical races occur sympatrically. At Usujiri (Minami-kayabe), where the prepacifenol race and the laureatin race were sympatric, hybrid gametophytes (recombination type) were found in high frequency in addition to hybrid tetrasporophytes, which strongly suggests that a new, prepacifenol/laureatin race is beginning to be produced by natural hybridization and recombination. By contrast, at Oshoro Bay, where the laurencin race and the epilaurallene race grew together, the interracial hybrids were rare: only a few tetrasporophytes (probably F1 generation) were found, suggesting that racial integrity may be retained by habitat segregation and/or the absence of recombination-type gametophytes.
  • Y Takahashi, M Suzuki, T Abe, M Masuda
    PHYTOCHEMISTRY 48 (6) 987 - 990 0031-9422 1998/07 [Refereed][Not invited]
     
    A new brominated, anhydroaplysiadiol has been isolated from a new Laurencia species, L. japonensis Abe et Masuda sp. ined., along with aplysiadiol and 2,10-dibromo-3-chloro-alpha-chamigrene. The last two compounds are commonly found in this species collected from various localities. The structure of anhydroaplysiadiol was deduced from spectral evidence. (C) 1998 Elsevier Science Ltd. All rights reserved.
  • M Masuda, K Kogame, T Abe, S Kamura
    BOTANICA MARINA 41 (2) 133 - 140 0006-8055 1998/03 [Refereed][Not invited]
     
    The red alga Laurencia palisada Yamada (Rhodomelaceae, Ceramiales), the lectotype species of the section Palisadae, is characterised by the following set of features: 1) rigidly cartilaginous upright axes arising from a discoid holdfast; 2) a shift of branching from a distichous to a spiral manner distally; 3) the production of two periaxial cells per vegetative axial segment; 4) the absence of longitudinally oriented secondary pit-connections between cintiguous superficial cortical cells; 5) the absence of projecting superficial cortical cells; 6) the presence of a palisade-like cortical layer; 7) the absence of lenticular thickenings in the walls of medullary cells; 8) the absence of corps en cerise in any cell; 9) the production of two tetrasporangium-bearing periaxial cells from each fertile segment; 10) a perpendicular arrangement of tetrasporangia; 11) procarps produced from the last-formed (fourth) peraxial cell of the terminal segment of a two-celled female trichoblast; 12) flask-shaped cystocarps; and 13) distally positioned spermatangial nuclei.
  • T Abe, M Masuda
    EUROPEAN JOURNAL OF PHYCOLOGY 33 (1) 17 - 24 0967-0262 1998/02 [Refereed][Not invited]
     
    The marine red alga Laurencia japonensis sp. nov. (Rhodomelaceae, Ceramiales) is described from the warm temperate region of Japan. It is characterized by the following combination of features: (1) terete, rigidly cartilaginous, upright axes arising from a primary discoid holdfast and stolen-like branches; (2) tristichous branching; (3) penultimate and ultimate branches showing pronounced adaxial bending; (4) adventitious branches formed chiefly in the axils; (5) the production of four periaxial cells per vegetative axial segment; (6) the presence of longitudinally oriented secondary pit connections between contiguous superficial cortical cells; (7) the absence of projecting superficial cortical cells; (8) the absence of a radially elongated cortical layer; (9) the presence of abundant lenticular thickenings in the walls of medullary cells; (10) the presence of a single corps en cerise per superficial cortical cell and trichoblast cell; (II) a parallel arrangement of tetrasporangia; (12) broadly ovoid cystocarps with the lower half immersed within the parent branch tissue; and (13) distally positioned spermatangial nuclei.
  • Tsuyoshi Abe, Michio Masuda, Shigeo Kawaguchi, Shintoku Kamura
    Phycological Research 46 (4) 231 - 237 1322-0829 1998 [Refereed][Not invited]
     
    The red alga Laurencia brongniartii J. Agardh (Rhodomelaceae, Ceramiales) is characterized by: (i) the production of four periaxial cells from each vegetative axial segment (ii) the presence of two or three corps en cerise per superficial cortical cell and one per trichoblast cell (iii) the production of a single tetrasporangium-bearing periaxial (fourth) cell per fertile segment (iv) a tetrasporangial arrangement that is intermediate between perpendicular and parallel types (v) procarps produced from the last-formed (fifth) periaxial cell of the terminal segment of a two-celled female trichoblast and (vi) distally positioned spermatangial nuclei, in addition to known features. The production of a single tetrasporangium-bearing periaxial cell per fertile segment allies this species to Laurencia similis Nam et Saito.
  • M Masuda, K Kogame, T Abe, S Kamura
    CRYPTOGAMIE ALGOLOGIE 18 (4) 319 - 329 0181-1568 1997/11 [Refereed][Not invited]
     
    The red alga Laurencia parvipapillata Tseng (Rhodomelaceae, Ceramiales) is characterised by the following set of features: 1) decumbent or prostrate thalli with conspicuously dorsiventral organisation; 2) distichous branching; 3) the production of two periaxial cells from each vegetative axial segment; 4) the sporadic occurrence of longitudinally and laterally oriented secondary pit-connections between contiguous superficial cortical cells; 5) the presence of projecting superficial cortical cells; 6) the presence of a palisade-like cortical layer; 7) the absence of lenticular thickenings in the walls of medullary cells; 8) the absence of corps en cerise; 9) a perpendicular arrangement of tetrasporangia; 10) the production of three tetrasporangium-bearing (an ordinary and two additional, the second to fourth) periaxial cells per fertile segment of tetrasporangial branches; and 11) spermatangia with distally-positioned nuclei.
  • M Masuda, T Abe, S Sato, T Suzuki, M Suzuki
    JOURNAL OF PHYCOLOGY 33 (2) 196 - 208 0022-3646 1997/04 [Refereed][Not invited]
     
    Many morphologically similar, but chemically distinct, populations have been found in the marine red alga Laurencia nipponica Yamada (Rhodomelaceae, Ceramiales) growing in Japan. Each chemical type is characterized by a specific end-product of halogenated secondary metabolite synthesis: chamigrane-type sesquiterpenoids such as prepacifenol and halochamigrene epoxide and C-15 bromoethers such as laurencin, laureatin, isoprelaurefucin, epilaurallene, and kumausallene. These seven types of secondary metabolite syntheses remained the same in the wild and under various culture conditions. Because bromoethers and terpenoids are probably synthesized by different metabolic pathways, it is virtually certain that different sets of enzymes participate in their synthesis. Prepacifenol- and laureatin-producing populations were selected as representatives of terpenoid and bromoether groups, respectively. F-1 tetrasporophytes derived from crosses between reciprocal, female and male gametophytes of prepacifenol- and laureatin-producing strains bore both types of metabolites, suggesting that the genes producing these enzyme systems are encoded by nuclear genomes. The F-1 gametophytes resulting from these reciprocal crosses produced either prepacifenol or laureatin, and the four individuals derived from spore tetrads (a set of tetraspores derived from a single tetrasporangium) produced either prepacifenol or laureatin in a 1:1 ratio, indicating that genes participating in terpenoid synthesis and those participating in bromoether synthesis are on different loci of homologous chromosomes and are segregated at meiosis (tetrasporogenesis). One individual of this interpopulational F-1 gametophyte produced both parental types of metabolite, perhaps indicating the occurrence of a recombination type. Natural hybrid individuals, including such recombination-type gametophytes, were found in a sympatric locality at which these two chemical types occur. F-1 tetrasporophytes derived from crosses between respective prepacifenol- and laureatin-producing strains and their F-1 gametophytes produced only parental-type metabolite-producing plants. These results indicate that the diverse chemical types can be referred to as races (chemical races).
  • Tsuyoshi Abe, Michio Masuda, Shigeo Kawaguchi, Taiji Itoh, Minoru Suzuki
    Phycological Research 45 (4) 173 - 176 1322-0829 1997 [Refereed][Not invited]
     
    The red alga Laurencia nipponica Yamada (Rhodomelaceae, Ceramiales) is known to contain several chemical races, each of which is characterized by a particular, major halogenated secondary metabolite. Both field-collected and cultured plants of a population of this species found recently at Shikanoshima Island, Fukuoka Prefecture, southern Japan, produced C15 bromoethers, (3E)-laureatin and (3E)-isolaureatin, and sesquiterpenoids, 2,10-dibromo-3-chloro-9-hydroxy-α-chamigrene and 2,10-dibromo-3-chloro-α-chamigrene. Laurencia nipponica can be referred to as a further chemical race that is characterized by the production of two C15 bromoethers, (3E)-laureatin and (3E)-isolaureatin, and a sesquiterpenoid, 2,10-dibromo-3-chloro-9-hydroxy-achamigrene as major compounds.
  • Michio Masuda, Tsuyoshi Abe, Teruaki Suzuki, Minoru Suzuki
    PHYCOLOGIA 35 (6) 550 - 562 0031-8884 1996/11 [Refereed][Not invited]
     
    Two red algal species, Laurencia composita Yamada and L. okamurae Yamada (Rhodomelaceae, Ceramiales), that grow in Japanese waters have often been confused with each other being similar in gross morphology. They can be morphologically distinguished by branching pattern (polystichous in L. composita and tristichous in L. okamurae) and the frequency of lenticular thickenings in the walls of medullary cells (rare in L. composita and frequent in L. okamurae). The two species have different ecological preferences: L. composita grows in the upper to mid-intertidal zones exposed to higher levels of desiccation, while L. okamurae grows in the lower intertidal and upper subtidal zones. The two species can also be distinguished by their characteristic secondary metabolites: L. composita produces chamigrane-type sesquiterpenoids such as prepacifenol, pacifenol, prepacifenol epoxide and johnstonol, whereas L. okamurae produces cyctolaurane-type sesquiterpenoids such as laurinterol and debromolaurinterol. Furthermore, the production by L composita of laurencenynes, precursors of many C-15 non-terpenoids containing a terminal acetylenic or bromine group, may be a sign of diversification in secondary metabolite synthesis of this species.
  • The occurrence of Laurencia saitoi Perestenko (L. obtusa auct. japon.) (Ceramiales, Rhodophyta) in Japan
    Masuda, M, Abe, T
    Japanese Journal of Phycology 41 (1) 7 - 18 1993 [Refereed][Not invited]
  • The conspecificity of Laurencia yendoi Yamada and L. nipponica Yamada (Ceramiales, Rhodophyta)
    Masuda, M, Abe, T, Saito, Y
    Japanese Journal of Phycology 40 (2) 125 - 133 1992 [Refereed][Not invited]

Books etc

  • Basic Guide to Safe Fieldwork
    Hokkaido University, Office of Health, Safety (ContributorChapter 6 Activities on the Coast and at Sea)
    2015/12
  • 川嶋昭二先生海藻画作品集
    木下大旗, 河原法子, 草島乃美, 阿部剛史 (Joint editor)
    北海道大学総合博物館 2012
  • 北大千島研究の系譜-千島列島の過去・現在・未来-
    阿部 剛史 (Contributor千島列島の海藻研究)
    北海道大学総合博物館 2007
  • 大樺太研究の系譜-サハリンの過去・現在・未来-
    阿部 剛史 (Contributorサハリンの海藻)
    北海道大学総合博物館 2006
  • 北大自然史タイプコレクション-128年知の伝承-
    増田道夫, 小亀一弘, 加藤亜記, 谷昌也, 阿部剛史 (Contributor海藻)
    21世紀COE「新・自然史科学創成」/北海道大学総合博物館 2004
  • 新奥尻町史 上巻
    阿部 剛史 (Contributor第8章 海藻相)
    奥尻町 1997

Conference Activities & Talks

  • Speciation and northward invasion of benthic marine algae during warm period  [Invited]
    ABE Tsuyoshi
    The 2011 Annual Meeting, The Palaeontological Society of Japan  2011/07
  • Laurencia complex spp. collected on Samui Isl. Aug. 2009  [Invited]
    ABE Tsuyoshi
    JSPS-AORI International Workshop on the Biodiversity of Seaweeds and Seagrasses  2010/08
  • How to identify Laurencia  [Invited]
    ABE Tsuyoshi
    JSPS-NRCT Workshop on Taxonomy of Seaweeds and Seagrasses  2009/08
  • Introduction to the genus Laurencia  [Invited]
    ABE Tsuyoshi
    JSPS Biodiversity Workshop: Seaweeds and Seagrasses  2004/11

Works

MISC

  • 平成29(2017)年度知床半島における浅海域生物相調査及び貝類定量調査報告書 II.海 藻
    阿部剛史, 江口暁彦, 松浦裕志, 南田悠, 鈴木稔, 野別貴博, 酒巻一修  平成29年度阿寒摩周国立公園及び知床国立公園等における再生可能エネルギーの効率的導入促進のための自然環境等インベントリ整備推進委託業務報告書  62  -72  2018  [Not refereed][Not invited]
  • S. Sutti, M. Tani, Y. Yamagishi, T. Abe, K. Kogame  PHYCOLOGIA  56-  (4)  182  -182  2017/08  [Not refereed][Not invited]
  • A review on the distributional characteristics of five species of Japanese algae (Laminariales) as the indicator species of long-term monitoring
    Terada, R, Kawai, H, Kurashima, A, Murase, N, Sakanishi, Y, Tanaka, J, Yoshida, G, Abe, T, Kitayama, T  モニタリングサイト1000沿岸域調査(磯・干潟・アマモ場・藻場)2008-2012年度とりまとめ報告書  68  -73  2013/10  [Not refereed][Not invited]
  • C. S. Vairappan, T. Ishii, M. Suzuki, T. Abe  PHYCOLOGIA  48-  (4)  49  -49  2009/07  [Not refereed][Not invited]
  • A. Kurihara, T. Abe, K. Kogame, A. R. Sherwood  JOURNAL OF PHYCOLOGY  43-  50  -50  2007/12  [Not refereed][Not invited]
  • List of marine algae from Tanetomi, Rishiri Island, Hokkaido, Japan on 2004
    Rishiri Studies  26-  31  -34  2007  [Not refereed][Not invited]
  • Genealogy of Chishima Studies by Scientists of Hokkaido University -Past, Present and Future of the Kurils-
    2007  [Not refereed][Not invited]
  • Marine algae of Akkeshi Daikokujima Isl. and Cape Erimo
    Bulletin of the Erimo Town Museum  (3)  1  -4  2006  [Not refereed][Not invited]
  • Genealogy of Karafuto Studies by Scientists of Hokkaido University -Past, Present and Future of Sakhalin-
    2006  [Not refereed][Not invited]
  • サハリン・千島植物標本データベース―タイプ標本集1-
    北海道大学総合博物館  2004  [Not refereed][Not invited]
  • The type collection of natural history, Hokkaido University
    2004  [Not refereed][Not invited]

Awards & Honors

  • 2000/03 日本藻類学会 第3回日本藻類学会論文賞

Research Grants & Projects

  • 文部科学省:科学研究費補助金(若手研究(B))
    Date (from‐to) : 2003 -2004 
    Author : 阿部 剛史
     
    ウラソゾにおけるケミカルレース相互について、主に培養株を材料としてrbcL遺伝子の塩基配列を決定し比較したところ、株間において差異は認められなかった。このことは、本種におけるケミカルレースの種内分化が、日本海が現在の海洋環境に近くなった地質時代的に見て非常に新しい時代に起きたとする、本研究における作業仮説に矛盾しないものである。サハリンにおける野外調査において、西海岸(日本海側)の数カ所でウラソゾの生育を確認した。なかでもサハリン北部の間宮海峡に近いTangiにおいても採集されたことは、本種の分布域が日本海の北端まで達していることを強く示唆する。なお、サハリン東海岸(オホーツク海)およびカムチャツカ南東海岸(太平洋)における調査では、いずれも本種の生育は確認されなかった。このことは、本種の分布域が対馬暖流とその支流の影響下にある海域に限られるとする、本研究における作業仮説と一致する。サハリン北部のTangiのウラソゾ個体群と、南部のYablochnyyの個体群について、それぞれが生成する二次代謝産物の種類を分析したところ、両者ともにprepacifenolであった。非常に遠距離であるにもかかわらず同じケミカルレースであり、かつprepacifenol raceは北海道北部にも広く分布していることから、北海道北部以北には一様にprepacifenol raceのみが分布している...
  • 文部科学省:科学研究費補助金(奨励研究(A), 若手研究(B))
    Date (from‐to) : 2001 -2002 
    Author : 阿部 剛史
     
    ソゾ類全体を単一の属Laurenciaとして扱う分類体系が近年まで世界で広く支持されてきたが、おもに内部構造に着目したNamらの研究により、Chondrophycus, Laurencia, Osmundeaの3属に分けるべきとの見解が主流となりつつある。本研究では、分子系統学的手法を用いてソゾ類全体の主な種間の系統類縁関係を検討した。DNA(rbcL遺伝子)の塩基配列情報をもとにソゾ類の系統樹を作成したところ、Chondrophycus, Laurencia, Osmundeaの3グループは、Chondrophycusの一部の例外を除き、それぞれ単系統となった。現在Chondrophycusとされている種のうち、コブソゾのみは、他の種とは単系統とならず、系統樹上の離れた位置を占める結果となったが、このことは、これら3グループは並列関係にあるのではなく、これらのうちでChondrophycusが祖先的であり、この中からLaurenciaおよびOsmundeaがそれぞれ別個に分化してきたと解釈することにより説明できる。また、本研究で得られた分子系統樹は、二次代謝副産物/サクランボ小体の有無に関する特徴と明瞭な整合性を示した。NamらはChondrophycusの一部の種でサクランボ小体の存在を報告しているが、この報告が材料の誤同定に由来していたものである可能性を示唆する結果とな...
  • Morphological, chemotaxonomical and molecular phylogenetic studies on genus Laurencia (Rhodophyta) and related genera.
    Grant-in-Aid for Scientific Research
    Date (from‐to) : 1990

Educational Activities

Committee Membership

  • 2008   The Japanese Society of Phycology   Treasurer   The Japanese Society of Phycology


Copyright © MEDIA FUSION Co.,Ltd. All rights reserved.