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UWAI Shinya
Research Center for Inland Seas
Professor

Researcher basic information

■ Research Keyword
  • population structure
  • isolation mechanism
  • local adaptation
  • speciation
  • population genetics
  • seaweed

Research activity information

■ Award
  • Mar. 2020 日本藻類学会, 第23回日本藻類学会論文賞, Haplotypic differentiation between seasonal populations of Sargassum horneri (Fucales, Phaeophyceae) in Japan
    Watanabe K, Homma Y, Karakisawa H, Ishikawa R, Uwai S

■ Paper
  • Miho Nomura, Ryoko Yasuda, Hideyuki Inui, Vladimir P. Beškoski, Djati Mardiatno, Bachtiar W. Mutaqin, Andhika Puspito Nugroho, Aditya Saputra, Christopher Gomez, Shinya Uwai, Hiroshi Kawai, Hideo Okamura
    Elsevier BV, May 2026, Regional Studies in Marine Science, 97, 105007 - 105007
    Scientific journal

  • Masakazu Hoshino, Meri Nehlsen, Rita A. Batista, Morgane Raphalen, Toshiyuki Wakimoto, Shinya Uwai, Kazuhiro Kogame, Vikram Alva, Susana Coelho
    Abstract Fertilization, the union of male and female gametes, is central to sexual reproduction, yet the molecular mechanisms that ensure partner recognition and enforce species specificity remain elusive. Here we identify PKN, a previously uncharacterized transmembrane protein expressed exclusively in female gametes of brown algae, as an essential determinant of fertilization. Loss of PKN abolishes fertilization without affecting earlier mating steps, including gamete attraction, placing its function as a key mediator of male-female recognition. PKN contains extracellular β-propeller and mucin-like domains that are enriched in predicted glycosylation sites and rapidly evolving, consistent with a role in species-specific cell-cell recognition. Notably, PKN enforces reproductive isolation within the genus Scytosiphon by preventing interspecific fertilization. Together, these findings uncover a female-encoded recognition mechanism in brown algae and reveal protein-glycan interfaces as a conserved strategy for enforcing sex- and species-specific fertilization across Eukaryotes.
    openRxiv, Feb. 2026
    Link to Kobe Univ. Repository (Kernel)

  • Eriko Sasagawa, Shinya Uwai, Kazuhiro Kogame
    Jan. 2026, PHYCOLOGICAL RESEARCH, 74(1) (1), 71 - 80, English
    [Refereed]
    Scientific journal

  • Ryuta Terada, Takuzo Abe, Shingo Akita, Mitsunobu Kamiya, Hiroshi Kawai, Akira Kurashima, Chikako Nagasato, Yoshihiko Sakanishi, Hiromori Shimabukuro, Haruka Suzuki, Jiro Tanaka, Shinya Uwai, Yuki Watanabe, Ryoko Ueno, Misuzu Aoki
    SUMMARY Significant changes in seaweed communities were identified at six sites in Japan through the long‐term monitoring program ‘ Monitoring Sites 1000 .’ This study summarizes the results of 15 years of surveys conducted from 2008 to 2022. Annual nondestructive permanent quadrat observations and line‐transect surveys, carried out perpendicular to the shoreline, were used to assess species composition, coverage, and vertical distribution. Canopy‐forming seaweeds were present at all sites from 2008 to 2015; however, Ecklonia radicosa at the Satsuma‐Nagashima site on Kyushu, facing the open ocean, suddenly disappeared in 2016 and has not recovered since. As this species currently persists only in a nearby semi‐enclosed area, monitoring continues at both the disappeared and remaining locations. Similarly, Ecklonia cava and Eisenia bicyclis at the Shimoda site in central Honshu, facing the Pacific Ocean, gradually declined after 2018 and had completely disappeared by 2022. At the Shizugawa site on the Pacific coast of northern Honshu, the upward shift of Eisenia bicyclis communities to shallower depths—caused by seafloor subsidence following the 2011 earthquake—has persisted, with no recovery at the species' former deepest distribution. Saccharina japonica at the Muroran site in Hokkaido was abundant nearshore but showed considerable interannual variation offshore. At the remaining two sites, Takeno and Awaji‐Yura, located on the coasts of the Sea of Japan and the Pacific Ocean in central Honshu, respectively, Ecklonia and Sargassum communities appeared relatively stable. Nonetheless, shifts in canopy‐forming species were frequently observed, suggesting ongoing gap dynamics driven by community succession and episodic disturbances such as typhoons and heavy rainfall. Over the 15‐year period, canopy‐forming species disappeared from two of the six sites, apparently due to direct or indirect impacts of environmental change. Even at the other four sites, persistent communities were influenced by abiotic and biotic factors, underscoring the need for continued long‐term monitoring.
    Wiley, Dec. 2025, Phycological Research
    [Refereed]
    Scientific journal

  • Christophe Vieira, Shingo Akita, Masahiro Suzuki, Ryuta Terada, Takeaki Hanyuda, Satoshi Shimada, Shinya Uwai, Hiroshi Kawai
    Abstract Japanese Dictyoteae have been documented since 1838, with a historical checklist of 21 names recorded prior to 1990. Persistent misidentifications—particularly of species originally described from Europe and the Americas—have complicated the taxonomy of the group in Japan. We reevaluated historical records and revised the national checklist for Canistrocarpus, Dictyota, Dilophus, and Rugulopteryx using integrated morpho‐genetic analyses. Broad sampling from Hokkaido to Okinawa, including Japanese type localities, together with sequence data from type localities of species described elsewhere but reported in Japan, corrected persistent taxonomic ambiguities. The long‐standing misapplication of the Asian D. dichotoma as D. spathulata was resolved. The revised checklist recognizes 19 species: 17 Dictyota, Canistrocarpus cervicornis, and Rugulopteryx okamurae. Species richness peaks in Kyushu with 15 species, whereas only D. spathulata extends to Hokkaido. Eight taxa appear native to the Northwest Pacific, including D. coriacea, D. haenyeosa, D. spathulata, D. spinulosa, D. sumbisoria, D. taewakia, Dictyota churaumia sp. nov., and R. okamurae. Twelve taxa exhibit broad, transoceanic distributions. We describe Dictyota churaumia sp. nov. and formally report nine species from Japan for the first time: Dictyota acutiloba, D. ceylanica, D. haenyeosa, D. humifusa, D. liturata, D. pfaffii, D. sandvicensis, D. sumbisoria, and D. taewakia. By integrating molecular data with morphological analyses, we resolved major taxonomic misidentifications and implemented the necessary taxonomic treatments (synonymies and typifications) to provide an updated taxonomic framework for the Dictyoteae flora of Japan. The presence of unique morphologies in historical herbarium specimens, coupled with unexplored regions of Japan, indicates a potential for additional, unidentified species.
    Wiley, Oct. 2025, Journal of Phycology
    [Refereed]
    Scientific journal

  • Shinya Hosokawa, Kyosuke Momota, Masaaki Sato, Kenta Watanabe, Yuki Watanabe, Shota Homma, Shota Okura, Shinya Uwai, Taichi Kosako, Yusuke Uchiyama
    Abstract Gene flow is a crucial concept in the delineation of conservation units for natural populations of a species. Seagrasses are marine species targeted for conservation because their abundance has declined worldwide during the last century. However, knowledge of how to delineate seagrass conservation units based on their genetic structure is inadequate. In this study, the genomes of Zostera marina L. (eelgrass) populations in three semi-enclosed areas with different spatial scales in Japan were analyzed using single nucleotide polymorphisms within genome-wide loci, and their genetic structures were explored in the context of their isolation caused by geographical distance and barriers. Isolation by distance was apparent at spatial scales of 200–2000 km. A barrier apparently due to a narrow strait in an area with linear dimensions less than 200 km led to greater genetic isolation than did distance. On a more local scale, we found that heterogeneity among sites and intra-site variability rather than isolation by distance or barriers governed the genetic structure of eelgrass on spatial scales less than ~ 20 km. Our results imply that future seagrass conservation efforts should make more use than before of genomic tools so that greater attention can be focused on the complex structures formed on local scales. Identifying the ecological importance of genetic heterogeneity and the functional meaning of genetic differences on local scales will be among the next challenges to the delineation of seagrass conservation units.
    Springer Science and Business Media LLC, May 2025, Estuaries and Coasts, 48(4) (4)
    [Refereed]
    Scientific journal

  • Masakazu Hoshino, Satoru Tadokoro, Shingo Akita, Shinya Uwai
    Sep. 2024, Phycological Research
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Shinya Hosokawa, Kyosuke Momota, Masaaki Sato, Kenta Watanabe, Yuki Watanabe, Shota Homma, Shota Okura, Shinya Uwai, Taichi Kosako, Yusuke Uchiyama
    Aug. 2024

  • Shinya Uwai, Daisuke Saito, Yoichi Sato
    Abstract To improve the quality and quantity of seaweed mariculture harvests, seedlings are frequently introduced from regions geographically apart from cultivation sites. The effects of such introduction have been insufficiently studied, despite increasing demands on seaweed cultivation as a measure against global warming. We here evaluated the degree of cryptic invasion occurring through mariculture using a brown algal species, Undaria pinnatifida. Cultivated materials used in the Seto Inland Sea, Japan, were introduced from northern Japan in the 1970s. Based on the clear genetic structure among Japanese Undaria populations, we compared mitochondrial haplotypes between wild populations and cultivated materials in the Seto Inland Sea. All cultivated materials analyzed had haplogroups native to northern Japan. Multiple haplogroups were observed in the wild populations, especially those in the eastern Seto Inland Sea, which is exceptional considering the reported genetic structure. Some northern Japan haplotypes were observed both in cultivated materials and wild individuals. A northern Japan haplogroup was predominant at several sites near Undaria-cultivation sites. These results strongly suggested that cryptic invasion through Undaria mariculture occurred here, although its ecological impact remains unclear. There is a clear risk of invasion by mariculture seedlings from other regions, even when native conspecific populations are present.
    Walter de Gruyter GmbH, Jun. 2024, Botanica Marina, English
    [Refereed]
    Scientific journal

  • Masakazu Hoshino, Kevin C. Wakeman, Aki Kato, Taiju Kitayama, Alison R. Sherwood, Shinya Uwai, Kazuhiro Kogame
    Feb. 2024, Phycological Research, 72(2) (2), 133 - 148, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Valérie Stiger-Pouvreau, Lydiane Mattio, Antoine De Ramon N’Yeurt, Shinya Uwai, Herminia Dominguez, Noelia Flórez-Fernández, Solène Connan, Alan T. Critchley
    Springer Science and Business Media LLC, May 2023, Journal of Applied Phycology
    [Refereed]
    Scientific journal

  • Shinya Uwai, Satomi Takagi, Takuma Sekiguchi, Nozomi Emura, Teruwo Morita, Akira Kurashima, Yoichi Sato
    Abstract Genetic structure analyses have yielded some examples of inconsistencies between genetic and morphological information. Here, eleven nuclear microsatellite markers and mitochondrial haplotypes were used to examine the genetic structure and gene flow among Japanese Undaria pinnatifida populations and the congeneric species U. undarioides and U. peterseniana. Undaria pinnatifida was subdivided into four “Groups” of populations based on Bayesian clustering analysis, Neighbor-net analysis and Principal coordinate analysis (PCoA). Undaria undarioides samples formed a unique Group. In contrast, U. peterseniana samples either grouped with a mixture of U. pinnatifida and U. undarioides clusters or were included within one of the U. pinnatifida clusters. More significantly, Groups of populations shared alleles with geographically adjacent Groups even between different morphospecies. No clear differences between the inter-and intra-specific genetic divergence were observed in either nuclear or mitochondrial markers. As a result, U. undarioides and U. peterseniana were synonymized with U. pinnatifida. Isolation-by-distance suggested the significance of geographical isolation for maintaining the observed divergence.
    Walter de Gruyter GmbH, Jan. 2023, Botanica Marina
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • M. Nomura, H. Okamura, Y. Horie, C.K. Yap, C. Emmanouil, S. Uwai, H. Kawai
    Elsevier BV, Nov. 2022, Chemosphere, 137141 - 137141
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Masakazu Hoshino, Atsuko Tanaka, Mitsunobu Kamiya, Shinya Uwai, Masanori Hiraoka, Kazuhiro Kogame
    Apr. 2021, Journal of Phycology, 57(2) (2), 416 - 434, English
    Scientific journal

  • Christophe Vieira, Shingo Akita, Shinya Uwai, Takeaki Hanyuda, Satoshi Shimada, Hiroshi Kawai
    Wiley, Feb. 2021, Phycological Research, 69(3) (3), 166 - 170, English
    [Refereed]
    Scientific journal

  • Hiroshi Kawai, Takeaki Hanyuda, Shingo Akita, Shinya Uwai
    Informa UK Limited, Aug. 2020, Applied Phycology, 1(1) (1), 1 - 8, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Y Homma, S Okuda, M Kasahara, F Takahashi, S Yoshikawa, S Uwai
    Marked seasonality, especially in sexual reproduction, is common among seaweed species along temperate coasts and increases the possibility of successful fertilization in outcrossing species. A phenological shift in reproductive seasons, therefore, could be an effective isolation barrier between conspecific seasonal populations, although its power has not been verified in algae. Sargassum horneri, a major component of seaweed beds along the temperate coast of Japan, is known for variability in its reproductive phenology. To understand the significance of phenological shift as an isolation barrier in seaweed species, phenological investigations of S. horneri seasonal populations on the Sea of Japan coast of central Honshu, Japan, were combined with Bayesian cluster analysis based on a nuclear simple sequence repeat genotype. Results from these analyses concordantly suggest a genetic differentiation between the seasonal populations, although almost 20% of field-collected plants were estimated to be hybrids or have a hybrid origin based on results of Bayesian cluster analyses using experimental hybrids. A collapse of seasonal isolation was also detected at the site of the field investigation, and a high percentage of putative hybrids in the following generation at the site (41%) suggested significant seasonal isolation in the differentiation observed in this study.
    Inter-Research Science Center, May 2020, Marine Ecology Progress Series, 642, 103 - 116, English
    [Refereed]
    Scientific journal

  • Haplotypic differentiation between seasonal populations of Sargassum horneri (Fucales, Phaeophyceae) in Japan
    Watanabe K, Homma Y, Karakisawa H, Ishikawa R, Uwai S
    Jan. 2019, Phycological Research, 67(1) (1), 59 - 64, English
    [Refereed]
    Scientific journal

  • Wilfred John E. Santiañez, Kyung Min Lee, Shinya Uwai, Akira Kurihara, Paul John L. Geraldino, Edna T. Ganzon-Fortes, Sung Min Boo, Kazuhiro Kogame
    Allen Press Publishing Services, 2018, Phycologia, 57(1) (1), 61 - 78, English
    [Refereed]
    Scientific journal

  • A late Pleistocene marine glacial refugium in the south‐west of Hainan Island, China: Phylogeographical insights from the brown alga Sargassum polycystum
    Hu Z.-M., Kantachumpoo A., Liu R.-Y., Sun Z.-M., Yao J.-T., Komatsu T., Uwai S., Duan D.-R.
    2018, Journal of Biogeography, 45, 355 - 366, English
    [Refereed]
    Scientific journal

  • K. Kogame, S. Uwai, R. J. Anderson, H. G. Choi, J. J. Bolton
    Elsevier B.V., Jan. 2017, South African Journal of Botany, 108, 337 - 341, English
    [Refereed]
    Scientific journal

  • Hiroshi Kawai, Takeaki Hanyuda, Shinya Uwai
    Springer Netherlands, Jan. 2016, Seaweed Phylogeography: Adaptation and Evolution of Seaweeds under Environmental Change, 227 - 249, English
    [Refereed]
    In book

  • Cladosiphon takenoensis sp. nov. (Ectocarpales s.l., Phaeophyceae) from Japan
    Kawai H., Hanyuda T., Kim S.-H., Ichikawa Y., Uwai S., Peters A.F.
    2016, Phycological Research, 64, 212 - 218, English
    [Refereed]
    Scientific journal

  • Kousuke Yaegashi, Yukimasa Yamagishi, Shinya Uwai, Tsuyoshi Abe, Wilfred John Eria Santianez, Kazuhiro Kogame
    Oct. 2015, BOTANICA MARINA, 58(5) (5), 331 - 343, English
    [Refereed]
    Scientific journal

  • Kazuhiro Kogame, Shozo Ishikawa, Kei Yamauchi, Shinya Uwai, Akira Kurihara, Michio Masuda
    Jul. 2015, PHYCOLOGICAL RESEARCH, 63(3) (3), 167 - 177, English
    [Refereed]
    Scientific journal

  • Attachai Kantachumpoo, Shinya Uwai, Thidarat Noiraksar, Teruhisa Komatsu
    Jun. 2015, OCEAN SCIENCE JOURNAL, 50(2) (2), 251 - 262, English
    [Refereed]
    Scientific journal

  • Mark D. Rothman, Lydiane Mattio, Thomas Wernberg, Robert J. Anderson, Shinya Uwai, Margaret B. Mohring, John J. Bolton
    Apr. 2015, JOURNAL OF PHYCOLOGY, 51(2) (2), 236 - 246, English
    [Refereed]
    Scientific journal

  • Attachai Kantachumpoo, Shinya Uwai, Thidarat Noiraksar, Teruhisa Komatsu
    Apr. 2014, JOURNAL OF APPLIED PHYCOLOGY, 26(2) (2), 1301 - 1308, English
    [Refereed]
    Scientific journal

  • Zi-Min Hu, Shinya Uwai, Shen-Hui Yu, Teruhisa Komatsu, Tetsuro Ajisaka, De-Lin Duan
    Sep. 2011, MOLECULAR ECOLOGY, 20(18) (18), 3894 - 3909, English
    [Refereed]
    Scientific journal

  • Atsuko Tanaka, Shinya Uwai, Wendy Nelson, Hiroshi Kawai
    Feb. 2010, European Journal of Phycology, 45(1) (1), 109 - 117, English
    [Refereed]
    Scientific journal

  • Kei Kimura, Chikako Nagasato, Shinya Uwai, Taizo Motomura
    2010, Cytologia, 75(4) (4), 353 - 361, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, K. Kogame, G. Yoshida, H. Kawai, T. Ajisaka
    Apr. 2009, MARINE BIOLOGY, 156(5) (5), 901 - 911, English
    [Refereed]
    Scientific journal

  • Origin and dynamics of the introduced populations of Undaria pinnatifida (Phaeophyceae) and detection of introduced populations of Ulva spp. (Ulvophyceae) by the analyses using molecular markers
    Hiroshi Kawai, Shinya Uwai, Takeaki Hanyuda, Kiyonori Nakamura, Satoshi Shimada, Judie Broom, Wendy Nelson, Frederique Viard
    2009, Japanese Journal of Ecology, 59(2) (2), 145 - 152, Japanese
    Scientific journal

  • 遺伝子マーカーを用いた褐藻ワカメ移入集団の起源・動態解析と緑藻アオサ類移入集団の検出
    川井浩史, 上井進也, 羽生田岳昭, 中村規代典, 嶌田智, Broom J., Nelson W., Viard F.
    2009, 日本生態学会誌, 59, 145 - 152, Japanese
    [Refereed]
    Scientific journal

  • Teruhisa Komatsu, Daisuke Matsunaga, Atsuko Mikami, Tatsuyuki Sagawa, Etienne Boisnier, Kenichi Tatsukawa, Masakazu Aoki, Tetsuro Ajisaka, Shinya Uwai, Katsuhiko Tanaka, Kenichi Ishida, Hideaki Tanoue, Takashige Sugimoto
    Oct. 2008, JOURNAL OF APPLIED PHYCOLOGY, 20(5) (5), 801 - 809, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, Shogo Arai, Teruwo Morita, Hiroshi Kawai
    Dec. 2007, PHYCOLOGICAL RESEARCH, 55(4) (4), 263 - 271, English
    [Refereed]
    Scientific journal

  • Tetsuro Ajisaka, Sung-Ho Kim, Shinya Uwai, Hiroshi Kawai
    The new species Cladosiphon umezakii Ajisaka (Ectocarpales, Phaeophyceae) is described from Japan based on morphology and DNA sequences. The species resembles Cladosiphon okamuranus Tokida in its gross morphology; somewhat slimy, cylindrical, multiaxial and sympodial erect thallus, arising from a small disc-shaped holdfast, and branching once to twice. However, C. umezakii has considerably longer assimilatory filaments (up to 840 mu m long, composed of up to 90 cells) than any known taxa of the genus. The species is a winter to spring annual, growing on lower intertidal to subtidal rocks of more or less exposed sites on the north-eastern coast of Kyushu and on both the Pacific and the Sea of Japan coasts of Honshu. Specimens from the Sea of Japan coast had both unilocular and plurilocular zoidangia, whereas those from Kyushu and from the Pacific had only unilocular zoidangia. Unilocular zoidangia were formed on the basal part of assimilatory filaments, and plurilocular ones were transformed from the distal part of assimilatory filaments. DNA sequences of the Rubisco-spacer (rbc-spacer) region and the nuclear rDNA ITS region (ITS1, 5.8S and ITS2) supported the distinctness of the species.
    BLACKWELL PUBLISHING, Sep. 2007, PHYCOLOGICAL RESEARCH, 55(3) (3), 193 - 202, English
    [Refereed]
    Scientific journal

  • Atsuko Tanaka, Chikako Nagasato, Shinya Uwai, Taizo Motomura, Hiroshi Kawai
    Sep. 2007, PHYCOLOGICAL RESEARCH, 55(3) (3), 203 - 213, English
    [Refereed]
    Scientific journal

  • Kathy Ann Miller, John M. Engle, Shinya Uwai, Hiroshi Kawai
    Jul. 2007, BIOLOGICAL INVASIONS, 9(5) (5), 609 - 613, English
    [Refereed]
    Scientific journal

  • New record of Sargassum filicinum Harvey (Fucales, Phaeophyceae) in the Pacific Coast of Mexico
    L.E. Aguilar-Rosas, R. Aguilar-Rosas, H. Kawai, S. Uwai, E. Valenzuela-Espinoza
    2007, Algae, 22, 17 - 21, English
    [Refereed]
    Scientific journal

  • M. Otani, T. Oumi, S. Uwai, T. Hanyuda, R. E. Prabowo, T. Yamaguchi, H. Kawai
    The occurrence and diversity of barnacles attached to the hulls of two intercontinental bulk carriers were studied at the port in Osaka Bay, Japan, to assess the potential risk of introduction of exotic species to the inner part of the bay. Barnacles were sampled from the bulbous bows, near the midship draft marks, and around the propeller posts and rudders. Twenty-two species were found, with 14 of these not previously recorded in Osaka Bay, including four species not previously recorded elsewhere in Japan. From an assessment of environmental similarity between Osaka Bay and native ranges, of the 14 species, Elminius modestus and Amphibalanus variegatus were considered to have the highest risk of introduction to the inner part of the bay.
    TAYLOR & FRANCIS LTD, 2007, BIOFOULING, 23(4) (4), 277 - 286, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, Wendy Nelson, Kate Neill, Wei Ding Wang, Luis E. Aguilar-Rosas, Sung Min Boo, Taiju Kitayama, Hiroshi Kawa
    Nov. 2006, PHYCOLOGIA, 45(6) (6), 687 - 695, English
    [Refereed]
    Scientific journal

  • S Uwai, N Yotsukura, Y Serisawa, D Muraoka, M Hiraoka, K Kogame
    Jan. 2006, HYDROBIOLOGIA, 553, 345 - 356, English
    [Refereed]
    Scientific journal

  • K Kogame, S Uwa, S Shimada, M Masuda
    The presence or absence of gamete fusion in the dioecious and isogamous brown alga Scytosiphon lomentaria (Scytosiphonaceae, Phaeophyceae) was investigated for thalli collected from three localities, Oshoro, Asari and Muroran in Hokkaido, northern Japan. Both sexual and asexual thalli were found in each locality. These sexual (35 samples) and asexual thalli (15 samples) were used to establish unialgal cultures. ITS2 sequences were determined in all cultures, the rbcL-spacer-S in 14, and cox3 in 25 cultures. Thirteen haplotypes (A1-4, B; C1-4 D E1-3) were found in ITS2 sequences (241-252 bp). Ten haplotypes (A1-4, B, C1-4 and D) were found in sexual samples: haplotypes A and B were found in Oshoro, C and D in Asari, and C in Muroran. Haplotypes E1-3 were found in asexual samples. Sequence divergence values (including gap information) were less than 4.03% among sexual samples (A, B C and D types), 0.38-0.77% among asexual samples (E types) and 4.39-5.70% between sexual and asexual samples. In the mitochondrial cox3 gene region (543 bp), six haplotypes (K 1-3, L, M and N) were obtained. Cox3-K types were found in samples of ITS2-A types, cox3-L type in ITS2-B type, cox3-M type in ITS2-C and D types, and cox3-N type in ITS2-E types. For cox3 sequences, nucleotide differences were 0.18-4.42% among sexual samples (K, L and M types), but 8.66-10.31% between sexual and asexual samples (N type). In partial rbcL (174 bp)-spacer (188 bp)-partial rbcS (90 bp) sequences, six haplotypes (R-W) were found although there were 1-4 bp nucleotide differences among these haplotypes. R, U and W types were found in sexual samples, and S, T and V types in asexual samples. Results of the sequence analyses suggest that our presumed asexual thalli are genetically different from sexual thalli and may be derived from populations that lack sexual reproduction.
    TAYLOR & FRANCIS LTD, Aug. 2005, EUROPEAN JOURNAL OF PHYCOLOGY, 40(3) (3), 313 - 322, English
    [Refereed]
    Scientific journal

  • S Uwai, C Nagasato, T Motomura, K Kogame
    May 2005, EUROPEAN JOURNAL OF PHYCOLOGY, 40(2) (2), 179 - 194, English
    [Refereed]
    Scientific journal

  • Taxonomic notes on marine algae from Malaysia. X. Four species of Dasya (Rhodophyceae), with the descriptions of Dasya longifila sp nov and D-malaccensis sp nov.
    M Masuda, S Uwai, K Kogame, S Kawaguchi, SM Phang
    May 2003, BOTANICA MARINA, 46(3) (3), 243 - 255, English
    [Refereed]
    Scientific journal

  • Y Yamagishi, M Masuda, T Abe, S Uwai, K Kogame, S Kawaguchi, SM Phang
    2003, BOTANICA MARINA, 46(6) (6), 534 - 547, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, Kazuhiro Kogame, Michio Masuda
    Blackwell Publishing, 2002, Phycological Research, 50(3) (3), 217 - 225, English
    [Refereed]
    Scientific journal

  • S Uwai, K Kogame, M Masuda
    Lead, May 2001, EUROPEAN JOURNAL OF PHYCOLOGY, 36(2) (2), 103 - 111, English
    [Refereed]
    Scientific journal

  • Kazuhiro Kogame, Shinya Uwai, Shigeo Kawaguchi
    Blackwell Publishing, 2001, Phycological Research, 49(4) (4), 281 - 284, English
    [Refereed]
    Scientific journal

  • A taxonomic study of the Elachista taeniaeformis complex and E-vellosa from the western Pacific (Elachistaceae, Phaeophyceae)
    S Uwai, K Kogame, M Masuda
    Jan. 2001, PHYCOLOGIA, 40(1) (1), 67 - 77, English
    [Refereed]
    Scientific journal

  • S. Uwai, K. Kogame, M. Masuda
    Blackwell Publishing, 2000, Phycological Research, 48(4) (4), 267 - 279, English
    [Refereed]
    Scientific journal

  • Kintarosiphonia (Rhodomelaceae, Ceramiales), a new red algal genus based on Pterosiphonia fibrillosa Okamura from Japan
    S Uwai, M Masuda
    May 1999, PHYCOLOGIA, 38(3) (3), 225 - 233, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, Michio Masuda
    Blackwell Publishing, 1999, Phycological Research, 47(2) (2), 125 - 133, English
    [Refereed]
    Scientific journal

  • Shinya Uwai, Michio Masuda
    Blackwell Publishing, 1999, Phycological Research, 47(4) (4), 241 - 250, English
    [Refereed]
    Scientific journal

  • Michio Masuda, Shinya Uwai, Kazuhiro Kogame
    Blackwell Publishing, 1998, Phycological Research, 46(4) (4), 239 - 251, English
    [Refereed]
    Scientific journal

■ MISC
  • 5) 植生の特徴と現存量の変化; 6) 15年間の藻場生態系モニタリングで確認された変化; 7) 藻場生態系のまとめと展望
    寺田竜太, 川井浩史, 倉島彰, 坂西芳彦, 島袋寛盛, 田中次郎, 阿部拓三, 上井進也, 長里千香子
    環境省自然環境局生物多様性センター, Mar. 2025, モニタリングサイト1000沿岸域調査 磯・干潟・アマモ場・藻場 2008-2022年度とりまとめ報告書, 266 - 282, Japanese
    Others

  • 4. 藻場生態系
    寺田竜太, 川井浩史, 倉島彰, 坂西芳彦, 島袋寛盛, 田中次郎, 阿部拓三, 上井進也, 長里千香子
    環境省自然環境局生物多様性センター, Mar. 2025, モニタリングサイト1000沿岸域調査 磯・干潟・アマモ場・藻場 2008-2022年度とりまとめ報告書, 230 - 235, Japanese
    Others

  • ２）各サイトの状況：竹野サイト；淡路由良サイト
    上井進也, 川井浩史
    Lead, 環境省自然環境局生物多様性センター, Mar. 2025, モニタリングサイト1000沿岸域調査 磯・干潟・アマモ場・藻場 2008-2022年度とりまとめ報告書, 252 - 259, Japanese
    Others

  • 水産研究のフロントから 神戸大学内海域環境教育研究センター マリンサイト
    上井 進也
    15 Jul. 2022, 日本水産学会誌, 88(4) (4), 313 - 313
    Others

  • Japanese marine macroalgae as non-indigenous species: their origin and dynamics deduced from genetic studies
    川井 浩史, 上井 進也, 羽生田 岳昭
    国際環境研究協会, 2011, Global environmental research, 16(1) (1), 45 - 52, Japanese

  • Ecological Characteristics of Drifting Seaweed Rafts Composed of Sargassum Species(Symposium: Drift of Marine Organisms: Transport from the Coast and their Ecology)
    Komatsu Teruhisa, Mikami Atsuko, Ajisaka Tetsuro, Uwai Shinya, Aoki Masakazu, Tanaka Katsuhiko, Fukuda Masahiro, Kokubu Yutaka, Tanaka Kiyoshi, Michida Yutaka, Sugimoto Takashige
    Patches of seaweed and seagrasses floating on the sea are called drifting seaweed or seagrass rafts, nagaremo (drifting seaweed) in Japanese. Such drifting seaweed rafts are commonly found in seas all over the world. Sargassum species are dominant in drifting seaweed found around Japan. These species have gas-containing vesicles transformed from leaves. Due to the buoyancy of these vesicles, these species can attain several meters in length during their peak season. After waves and currents have detached Sargassum species from the bottom, most of these plants become drifting seaweed. The authors researched the origins of drifting seaweed rafts in the East China Sea: their distribution, genetic analysis and performed satellite tracking buoy experiments. The results suggest that such drifting seaweed rafts are composed of only Sargassum horneri and one of their origins is coast of islands off Zhejian Province, China. Drifting seaweed of Sargassum species are biologically active photosynthesizing, growing and maturing while floating. The authors studied the timing of detaching and the biomass of seaweeds detached from their beds, photosynthesis, growth and maturation during the drifting period by fixed quadrant observation of the beds and cultivation of cropped Sargassum species on land. Finally the authors discuss the ecological significance of the drifting period for Sargassum species.
    日本海洋学会沿岸海洋研究部会, 2009, Bulletin on coastal oceanography, 46(2) (2), 127 - 136, Japanese

  • 日本のワカメは外国の海に侵入したか―分子系統地理学的知見―
    川井浩史, 上井進也, 北山太樹, Wendy Nelson, Kate Neill, 夫性民
    2008, 海藻資源, (19) (19), 38, Japanese
    Report research institution

  • Intercontinental introductions of marine macroalgae: analyses of origins spread pathways of introduced populations using molecular markers
    川井 浩史, 上井 進也, 羽生田 岳昭
    生物研究社, Jun. 2007, Aquabiology, 29(3) (3), 212 - 220, Japanese

  • アカモク・シダモク種群における集団間の遺伝的多様性について (ホンダワラ類--分布と生態)
    上井 進也, 小亀 一弘, 吉田 吾郎
    海洋出版, Jul. 2005, 海洋, 37(7) (7), 466 - 470, Japanese

  • 藻場生態系の維持と再生 ホンダワラ類(褐藻類)の形態変異の研究-特に気胞について-
    鯵坂哲朗, 新井章吾, 石樋由香, 上井進也, 小亀一弘
    2004, 月刊海洋, 36(11) (11)

■ Books And Other Publications
  • 佐渡市レッドデータブック
    上井進也
    Contributor, 海藻類（クロメ、スギモク）, 佐渡市, Apr. 2022

■ Lectures, oral presentations, etc.
  • 瀬戸内海東部の海藻の多様性について〜ワカメ・ヒロメの遺伝的多様性を中心に
    上井進也
    南紀生物同好会2025年度秋の研究発表大会, Dec. 2025, Japanese
    [Invited]
    Invited oral presentation

  • 瀬戸内海沿岸におけるワカメの遺伝的構造について
    上井進也, 星野雅和, 焦天怡, 白樫真, 伊藤龍星, Shan Tifeng, 斎藤大輔, 佐藤陽一
    日本藻類学会第49回大会ー沖縄2025ー, Mar. 2025, Japanese, Domestic conference, Co-authored internationally
    Poster presentation

  • 藻場におけるモニタリング方法
    上井進也
    竹野における藻場保全に関する勉強会, Feb. 2025, Japanese, Domestic conference
    [Invited]
    Nominated symposium

  • 大阪湾の地域ごとの海域環境と藻場に与える影響
    上井 進也
    大阪湾ブルーカーボン生態系アライアンス（MOBA）第１回ワーキング, Sep. 2024, Japanese, Domestic conference
    [Invited]
    Public discourse

  • KU-MACC ~ a macroalgal culture collection in Japan" Mini Symposium Algal culture collection".
    Uwai S., Hoshino M., Kawai H.
    9th Asian Pacific Phycological Forum. Hokkaido University, Sapporo, Japan, Apr. 2024, English, International conference
    [Invited]
    Nominated symposium

  • Genetic diversity of Undaria populations in Seto Inland Sea, an enclosed coastal sea of Japan
    Uwai S., Hoshino M., Saito D., Jiao T., Sato Y.
    9th Asian Pacific Phycological Forum. Hokkaido University, Sapporo, Japan, Apr. 2024, English, International conference
    Poster presentation

  • 一塩基多型にもとづく瀬戸内海のワカメの遺伝的多様性の解析
    上井進也, 斎藤大輔, 佐藤陽一
    本藻類学会第47回大会．北海道大学（オンライン）, Mar. 2023
    Poster presentation

  • 海藻にみられる集団構造は何を教えてくれるのか
    上井進也
    2022年度藻類談話会, Nov. 2022
    [Invited]
    Invited oral presentation

  • 環境省モニタリングサイト1000沿岸域調査における藻場のモニタリング 2021年の成果
    寺田竜太, 阿部拓三, 神谷充伸, 川井浩史, 倉島彰, 長里千香子, 坂西芳彦, 島袋寛盛, 田中次郎, 上井進也, 青木美鈴
    日本藻類学会第46回大会 福井（オンライン）, Mar. 2022, Japanese
    Poster presentation

  • Genetic impact of mariculture on wild Undaria populations
    上井進也, 斎藤大輔, 羽生田岳昭, 高木聖実, 辰野敦俊, 佐藤陽一
    The 46th Japanese Society of Phycology Annual Meeting-Fukui (Online) 2022, Mar. 2022, Japanese
    Poster presentation

  • 褐藻アカモクの季節集団間にみられる遺伝的分化について
    本間由莉, 奥田修二郎, 笠原賢洋, 高橋文雄, 吉川伸哉, 上井進也
    日本植物学会第83回大会, Sep. 2019, Japanese
    Poster presentation

■ Research Themes
  • 瀬戸内海の褐藻ワカメ集団の起源ー系統地理解析と人為的導入の影響評価
    上井 進也
    日本学術振興会, 科学研究費助成事業, 基盤研究(C), 神戸大学, 01 Apr. 2022 - 31 Mar. 2025

  • Analyses on the reproductive isolation machanism(s) in Sargassum horneri
    UWAI Shinya
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 01 Apr. 2019 - 31 Mar. 2022
    Clear evidences of genetic and physiological differentiation between sympatric seasonal populations of Sargassum horneri (Phaeophyceae) in Niigata Prefecure were provided in this study; in addition, this project suggested that some numbers of hybrids between the seasonal populations are there as estimated by genetic assignment provability of experimental hybrids, and therefore, these populations keep the identity in face of certain amount of gene flows. In congruence with these data, Genetic analysis based on SNPs showed that genetic distance between the seasonal populations is far smaller than the distances between seasonal populations in Seto Inland Sea.

  • Variation in reporductive seasons and its mechanism in a seaweed species
    Uwai Shinya, YOSHIKWA Shinya, HONMA Yuri, WATANABE Kohei
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Niigata University, 01 Apr. 2014 - 31 Mar. 2018
    Sargasum horineri is an annual brown algae, sometimes grows more than 10m in height. In Niigata prefecture, reproductive period of this species lasts from January to June. This study aimed to understand the mechanism to make this long reproductive period and its power as an isolation mechanism. In the field observations, variation in reproductive period has been confirmed at three sites of mainland honshu (Ichiburi, Kasashima, Kamomegahana). In culture experiments, winter-fertile plants showed no clear photoperiodity in sexual maturation, which is clearly different from spring-fertile plants. Molecular analyses, based on mitochondrial cox3 and nuclear microsatellite markers, showed strong genetic differentiation between the populations being fertile in January to March and those in April to June. Furthermore, the microsatellite markers showed genetic differentiation between sites, which make a complex genetic structure in S. horneri population in Niigata prefecture.

  • Origins and fate of floating seaweeds in East China Sea
    KOMATSU Teruhisa, AOKI Masakazu, AJISAKA Tetsuro, ISHIDA Kenichi, MICHIDA Yutaka, UWAI Shinya, SHISHIDOU Hirotoshi, ABE Hiroshi, TATSUKAWA Kenichi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), The University of Tokyo, 01 Apr. 2010 - 31 Mar. 2015
    In East China Sea, floating seaweed rafts are very important for fisheries because they serve as spawning substrates for fishes and a habitat for juvenile fishes. We conducted research cruises in every February and/or March of 2010 to 2012 for surveying distributions of floating seaweed rafts and sampling them. The floating seaweeds consisted of only Sargassum horneri. They were distributed on the continental shelf west of the Kuroshio front. We surveyed distribution of Sargassum horneri along the coasts of East China Sea and its adjacent waters with Chinese, Korean and Taiwanese researchers and analyzed genetic differences among their localities. We studied a food chain, phytal fauna and floating durations of floating seaweeds. Particle tracking experiments using a numerical model of surface currents suggests that floating Sargassum horneri originate from the Chinese coast in East China Sea. Bottom trawl surveys found seaweed debris on the sea bottom.

  • Genetic differentiation and Temperature requirement for maturation in Undaria pinnatifida (Phaeophyceae)
    UWAI Shinya
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Niigata University, 2008 - 2010
    Genetic differentiation among the wild populations of Undaria pinnatifida (Phaeophyceae) was analyzed using mitochondrial and nuclear SSR markers in northern Kanto. 30-50 plants were collected from each of five populations (Onahama, Ju-oh, Oharai, Choshi, Katsu-ura ; north to south), among which the Onahama population was highly differentiated with the Fst values of 0.46-0.56 in SSR. Any mitochondrial haplotypes of the Onahama population were not shared with other populations, but some alleles of SSRs were common among Onahama, Ju-Oh and Oharai. These results suggests that the genetic structure reported based on the mitochondrial marker could be observed in nuclear markers, and that the gene-flow of this oogamous species might be occurred by male gametes rather than the female gametes and zoospores.

  • Distribution of Sargassum beds and its contribution to drifting seaweeds in East China Sea
    KOMATSU Teruhisa, AOKI Masakazu, AJISAKA Tetsuro, ISHIDA Kenichi, MICHIDA Yutaka, UWAI Shinya
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 2007 - 2010
    In East China Sea, drifting seaweeds play an important role as nursery ground for juveniles of yellowtail and Japanese mackerel. However, there had been little information about drifting seaweeds. Therefore we studied distribution, ecology and source of drifting seaweeds in East China Sea. Our studies clarified that drifting seaweeds consisted of only Sargassum horneri, rafts of drifting seaweeds were distributed shoreward from the Kuroshio front and Sargassum forests around the islands off Zhejiang Province, China, consisting of mainly S. horneri were a possible source of drifting seaweeds.

  • 日本産大型褐藻の種内の遺伝的多様性の解析
    上井 進也
    日本学術振興会, 科学研究費助成事業, 特別研究員奨励費, 2003 - 2005
    アカモク・シダモク種群における集団間の遺伝的多様性について、これまで用いてたミコトンドリアゲノム由来のマーカーに加え、核ゲノム由来のマーカーをSSCP法を用いた解析により導入し、これまで別種とされてきたアカモクとシダモクの間に雑種とみられる個体が存在することを確認した。またミトコンドリアマーカーによる解析についてもnested clade analysisという統計的手法を用い、より詳細に日本沿岸のアカモク・シダモク種群の系統地理について解析をおこない、最終氷期以降本種群が日本沿岸において気候変動の経影響を強く受けて集団サイズの変動を繰り返してきたことをあきらかにした。 また日本沿岸において様々な魚種の稚魚の生育場所として水産的重要性が認識されている流れ藻がどこから流れてくるか、といり問題について、アカモク集団間の遺伝的変異の地埋的分布を利用した推定を試み、東シナ海のアカモク流れ藻集団、日本沿岸のアカモク固着集団、中国上海沖の流れ藻の起源地といわれている乗四諸島の固着集団を比較した。その結果従来言われてきた説とは異なり、乗四諸島は東シナ海の流れ藻の起源地としては考えにくいことが明らかになった。また九州沿岸や高知沖で採集されたアカモク流れ藻集団同士をくらべ、従来いわれてきたように沿岸域と沖合の流れ藻では地埋的起源が異なること、また同じ海域でも一か月の差で流れ藻の遺伝的組成が大きく異なることを明らかにした。 ワカメ属の種間雑種の解析では、ワカメ、アオワカメ、ヒロメの3種についてマイクロサテライトによる解析を導入し、ワカメについて開発されたマイクロサテライト遺伝子座のいくつかについてヒロメ、アオワカメでも利用可能のであることを確かめた。

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