Published Papers - NAIKI Akiyo

First records of Maruca amboinalis (Felder, Felder & Rogenhofer, 1875) (Lepidoptera, Crambidae) from mangrove habitats, and additional host-plant records from Iriomote Island, southern Japan

Wachi N.

Check List ( Check List )  22 ( 3 ) 448 - 457   2026.05 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Distribution of alien Sphagneticola trilobata (Asteraceae) on Iriomotejima Island, Okinawa, Japan

Akiyo Naiki, Takenori Yamamoto, Shinya Imura, Shin Watanabe

The biological magazine Okinawa ( Okinawa Biological Society )  64   91 - 99   2026.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

Chromosome Numbers of Two Japanese Antrophyum, A. obovatum and A. formosanum (Pteridaceae, Polypodiales)

Tao Fujiwara, Katsuhiro Yoneoka, Takenori Yamamoto, Akiyo Naiki

The Journal of Japanese Botany   101 ( 1 )   2026.02 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Cytological observation was conducted for the first time on Japanese Antrophyum (Pteridaceae), namely A. obovatum and A. formosanum. The chromosome numbers of the two species were counted as 2n = 240 for the former and 2n = ca. 240 for the latter. Considering the basic chromosome number is x = 30, they are considered as octoploid species. The chromosome numbers, 2n = 240, are first reported for them. Our study demonstrated the pervasiveness of polyploidy in the genus.

Phylogenetic Relationships of Eurya (Pentaphylacaceae) with a Focus on Japanese Species

Tetsuo OHI-TOMA, Emiko OGURI, Harue ABE, Hidetoshi KATO, Masaharu AMANO, Mong-Huai SU, Hanghui KONG, Hidetoshi NAGAMASU, Akiyo NAIKI

The Journal of Japanese Botany   100 ( 5 ) 373 - 384   2025.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

New record of alien Melothria pendula from Iriomotejima Island, Okinawa, Japan

Akiyo Naiki

The Biological Magazine Okinawa ( The Biological Society of Okinawa )  63   89 - 92   2025.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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An alien plant, Melothria pendula L., native to northeastern to southern parts of the U.S.A. and Central and South America, was found growing on the side of a farm road in the northern part of Iriomotejima Island, Okinawa, Japan. Since this species may cover other plants and inhibit their growth, it is necessary to monitor its distribution on the island.

Two new species and one new addition of Lasianthus (Rubiaceae) for the flora of Vietnam

VAN-SON DANG, TUAN ANH LE, THANH SON HOANG, VAN SON LE, VAN BAC HA, QUOC TRONG PHAM, SOULADETH PHETLASY, SHUICHIRO TAGANE, AKIYO NAIKI

Phytotaxa     2025.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Double migration of the endangered Tricyrtis formosana (Liliaceae) in Japan.

Tsunenari K, Ito T, Yokota M, Shibabayashi M, Endo C, Chung KF, Suyama Y, Matsuo A, Abe A, Naiki A, Setoguchi H, Makino T, Isagi Y

Scientific reports ( Scientific Reports )  14 ( 1 ) 957 - 957   2024.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The Ryukyu Islands of Japan are a biodiversity hotspot due to geographical and historical factors. Tricyrtis formosana is a perennial herbaceous plant that commonly found in Taiwan. But only a few populations have been identified in a limited habitat on Iriomote Island, while populations of unknown origin occur near human settlements in an area on the main island of Okinawa. To better understand these populations of the phylogenetic uniqueness and intrinsic vulnerability, we conducted comparative analyses including (1) phylogeny and population structure with MIG-seq data, (2) photosynthesis-related traits of plants grown under common conditions and (3) transcriptome analysis to detect deleterious variations. Results revealed that T. formosana was split into two clades by the congeners and that Iriomote and Okinawa populations independently derived from ancestral Taiwanese populations in each clade. Photosynthetic efficiency was lowest in the Iriomote population, followed by Okinawa and Taiwan. Transcriptome analysis showed that the Iriomote population accumulated more deleterious variations, suggesting intrinsic vulnerability. These results indicate that each T. formosana population in Japan is phylogenetically unique and has been independently dispersed from Taiwan, and that the Iriomote population presents a high conservation difficulty with a unique photosynthesis-related characteristic and a larger amount of deleterious variations.

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New or noteworthy distribution records of some vascular plants from Iriomote Island, Okinawa, Japan

Takenori Yamamoto, Koji Yonekura, Atsushi Abe, Masaharu Amano, Hironori Toyama, Takuto Shitara, Shuichiro Tagane, Aya Hasegawa, Mikio Kashima, Tadashi Kajita, Akiko Soejima, Akiyo Naiki

  98 ( 4 ) 178 - 191   2023.08 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Hymenophyllum pilosissimum C. Chr. (Hymenophyllaceae) on Iriomote Island, a New Record for Japan

Akiyo Naiki, Takenori Yamamoto, Aya Hasegawa, Tao Fujiwara, Katsuhiro Yoneoka, Atsushi Ebihara

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  74 ( 2 ) 131 - 133   2023.07 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Hymenophyllum pilosissimum C. Chr. (Hymenophyllaceae), recently discovered on Iriomote Island, is reported for the first time in Japan.

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Rediscovery of Exallage auricularia (Rubiaceae) from Yonaguni Island, Okinawa, Japan

Akiyo Naiki, Tadaki Nakasone, Tetsuo Ohi-Toma, Koji Yonekura, Atsushi Abe

The journal of Japanese botany   98 ( 3 ) 134 - 139   2023.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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First Record of an Alien Plant Species, <i>Dentella repens</i> (<i>Rubiaceae</i>) from Japan

KAJITA Yui, YONEKURA Koji, NAIKI Akiyo

The Journal of Japanese Botany ( The Editorial Board of The Journal of Japanese Botany )  98 ( 2 ) 97 - 100   2023.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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<p>We collected an alien plant, <i>Dentella repens</i> (L.) J.R.Forst. & G.Forst. (<i>Rubiaceae</i>) for the first time from the northern part of Iriomote Island, Okinawa, Japan in 2020. It is a new record of the species and the genus <i>Dentella</i> from the country. Since the first record in 2020, the plant has been found steadily growing at one site in a village near the northern shore of the island. We observed the morphology of the collected materials in detail under a stereomicroscope and the characteristics were generally consistent with the descriptions of the species in previous studies. The features of hairs on the corolla and calyx lobes are new additional information for the species.</p>

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Lectotypification of Gardneria multiflora (Loganiaceae)

OHI-TOMA Tetsuo, TANAKA Nobuyuki, NAIKI Akiyo

The Journal of Japanese Botany ( The Editorial Board of The Journal of Japanese Botany )  98 ( 2 ) 77 - 81   2023.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Lectotype of Gardneria multiflora Makino (Loganiaceae) is designated. The name was proposed based on cultivated plants in 1892 and its valid publication in 1901 was prompted by the specimen collected from a wild population in Okayama Prefecture, Japan and sent to Makino by Zensuke Yoshino. As we could not find this Yoshino specimen, we selected a specimen with flowers collected by Makino himself as the lectotype of G. multiflora from the other three specimens made from the cultivated plants in the Botanical Gardens, Science College, Tokyo Imperial University. Supplementarily we comment on Yoshino's other specimens in herbaria TI, MAK and KURA.

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New record of coconut palm Cocos nucifera (Arecaceae) in the wild state from Iriomotejima Island, Okinawa, Japan

Kotaro Okoshi, Masaharu Amano, Takenori Yamamoto, Akiyo Naiki, Yukiko Saito

The Biological magazine, Okinawa   61   69 - 72   2023.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

A revision of the genus Lasianthus Jack (Rubiaceae) from Vietnam

Van-Son Dang, Akiyo Naiki

Phytotaxa   581 ( 1 ) 1 - 150   2023.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The contrary conservation situations of two local critically endangered species, Vaccinium emarginatum (Ericaceae) and Elatostema platyphyllum (Urticaceae), growing on the eastern edge of the distribution

Mayu Shibabayashi, Taiga Shimizu, Chinatsu Tokuhiro, Yoshihisa Suyama, Shota Sakaguchi, Takuro Ito, Chih-Chieh Yu, Kuo-Fang Chung, Jun’ichi Nagasawa, Toshiaki Shiuchi, Goro Kokubugata, Atsushi Abe, Akiyo Naiki, Atsushi J. Nagano, Yuji Isagi

Frontiers in Ecology and Evolution ( Frontiers Media SA )  11   2023.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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As biodiversity loss continues, there is an urgent need to develop efficient conservation measures to protect diversity with limited conservation resources. Conservation targets have generally been selected based on their population size, but more detailed assessments clarifying the phylogenetic genetic status, history, and phylogenetic uniqueness of rare species is crucial to set more appropriate and effective conservation measures. In Japan, the Act on Conservation of Endangered Species of Wild Fauna and Flora designated endangered plants with high conservation priority, but &amp;gt;40% of these species also grow overseas. We conducted comparative analyses based on ddRADseq and MIG-seq to evaluate the population conservation status and value of Vaccinium emarginatum and Elatostema platyphyllum which are growing across national borders at the eastern edge of their species distribution range. The analyses revealed contrasting conservation status between the two species; the Japanese population of V. emarginatum had lower genetic diversity at the individual level and phylogenetically differentiated from Taiwanese populations, while that of E. platyphyllum had higher diversity at the individual level and is a relatively recent migrant with little phylogenetical differentiation from Taiwanese populations. The two species, which share the common feature of being critically rare in Japan, showed contrasting genetic/phylogenetic characteristics. This study provided useful information for appropriate conservation measures based on species’ phylogenetic traits and genetic diversity.

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Two new species of genus Helicteres (Helicteroideae, Malvaceae) from Vietnam

Dang, V.-S, B.-V. Truong, N.-S. Hoang, V.-T. Nguyen, Q.-B. Nguyen, Q.-T. Pham, V.-T. Le, C.-N. Kieu, V.-H. Bui, A. Naiki

Academia Journal of Biology   44 ( 4 ) 123 - 132   2022.12 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Lasianthus gialaiensis (Rubiaceae), a New Species from the Gia Lai Plateau of Vietnam

Dang Van-Son, Truong Ba-Vuong, Hoang Nghia-Son, Le Van-Tho, Dang Minh-Quan, Nguyen Manh-Ha, Naiki Akiyo

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  73 ( 3 ) 205 - 209   2022.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Lasianthus gialaiensis V. S. Dang, Vuong, Quan & Naiki, a new species from Kon Chu Rang Nature Reserve, Gia Lai Province, in the central highlands of Vietnam, is described and illustrated. It is morphologically similar to L. bokorensis , which was discovered in Bokor National Park, southern Cambodia, in the shape of the leaves, inflorescences and orange fruit, but differs in having shorter petioles, shorter stipules and calyx tubes, larger corolla, and green calyx. A vernacular name, ecological information and a table comparing it with L. bokorensis are also provided.

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A New Locality for Elatostema lineolatum Wight var. majus Wedd. (Urticaceae) from Iriomote Island, Japan

Naiki Akiyo, Amano Masaharu, Yonekura Koji, Okoshi Kotaro, Saito Yukiko, Yamamoto Takenori, Shitara Takuto, Abe Atsushi

Acta Phytotaxonomica et Geobotanica ( 日本植物分類学会 )  73 ( 3 ) 219 - 226   2022.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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<i>Elatostema lineolatum </i>Wight var. <i>majus </i>Wedd. (Urticaceae) was recently found on Iriomote Island, Okinawa, Japan. Morphological and cytological observations and DNA barcoding based on nucleotide sequences of chloroplast <i>psbA-trnH </i>and nuclear ribosomal internal transcribed spacer (ITS) regions were used to compare it with <i>E. lineolatum </i>var. majus in Taiwan.

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Genomic insights into rapid speciation within the world's largest tree genus Syzygium.

Low YW, Rajaraman S, Tomlin CM, Ahmad JA, Ardi WH, Armstrong K, Athen P, Berhaman A, Bone RE, Cheek M, Cho NRW, Choo LM, Cowie ID, Crayn D, Fleck SJ, Ford AJ, Forster PI, Girmansyah D, Goyder DJ, Gray B, Heatubun CD, Ibrahim A, Ibrahim B, Jayasinghe HD, Kalat MA, Kathriarachchi HS, Kintamani E, Koh SL, Lai JTK, Lee SML, Leong PKF, Lim WH, Lum SKY, Mahyuni R, McDonald WJF, Metali F, Mustaqim WA, Naiki A, Ngo KM, Niissalo M, Ranasinghe S, Repin R, Rustiami H, Simbiak VI, Sukri RS, Sunarti S, Trethowan LA, Trias-Blasi A, Vasconcelos TNC, Wanma JF, Widodo P, Wijesundara DSA, Worboys S, Yap JW, Yong KT, Khew GSW, Salojärvi J, Michael TP, Middleton DJ, Burslem DFRP, Lindqvist C, Lucas EJ, Albert VA

Nature communications ( Nature Communications )  13 ( 1 ) 5031   2022.09 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The relative importance of the mechanisms underlying species radiation remains unclear. Here, the authors combine reference genome assembly and population genetics analyses to show that neutral forces have contributed to the radiation of the most species-rich tree genus Syzygium.Species radiations, despite immense phenotypic variation, can be difficult to resolve phylogenetically when genetic change poorly matches the rapidity of diversification. Genomic potential furnished by palaeopolyploidy, and relative roles for adaptation, random drift and hybridisation in the apportionment of genetic variation, remain poorly understood factors. Here, we study these aspects in a model radiation, Syzygium, the most species-rich tree genus worldwide. Genomes of 182 distinct species and 58 unidentified taxa are compared against a chromosome-level reference genome of the sea apple, Syzygium grande. We show that while Syzygium shares an ancient genome doubling event with other Myrtales, little evidence exists for recent polyploidy events. Phylogenomics confirms that Syzygium originated in Australia-New Guinea and diversified in multiple migrations, eastward to the Pacific and westward to India and Africa, in bursts of speciation visible as poorly resolved branches on phylogenies. Furthermore, some sublineages demonstrate genomic clines that recapitulate cladogenetic events, suggesting that stepwise geographic speciation, a neutral process, has been important in Syzygium diversification.

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Reproductive phenology of 221 species of vascular plants for three years in Iriomote Island, Okinawa, Japan

Yui KAJITA, Hironori TOYAMA, Takenori YAMAMOTO, Akiyo NAIKI

Bulletin of the Osaka Museum of Natural History   76   97 - 124   2022.03 [ Peer Review Accepted ]

Type of publication: Research paper (bulletin of university, research institution)

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