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Syou Kato,Jiro Tanaka,Norio Tanaka,Jun Yokoyama,Yu Ito,Yoichiro Fujiwara,Atsushi Higa,신고 고바야시,Makoto M. Watanabe,Hidetoshi Sakayama 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.1
Members of the brackish-water species Lamprothamnium succinctum (Charales, Charophyceae) arewidely distributed from tropical to temperate regions, including East Asia. In Japan, L. succinctum is listedas an endangered species and is protected by the government, because it was recorded only at two localities,Lake Hachiro-gata (Akita Prefecture) and Oo-ike pond (Deba-jima Island, Tokushima prefecture),and has become extinct in the former. In this study, we identified five new localities of this species inJapan. The morphological characteristics of their thalli agreed with those provided in the originaldescription of this species, with distinctive reproductive characteristics. Moreover, the oospores of Japanesespecimens of L. succinctum were examined for the first time using scanning electron microscopy. The oospores of Japanese specimens exhibited granulate fossa wall patterns, which were consistent withthose described in previous studies. Our genetic analyses based on the DNA sequences of two chloroplastDNA markers, including both the coding and non-coding regions, revealed that the sample from Oo-ikepond is distinguishable from those from other Japanese specimens, although they are genetically verysimilar.
Kohtaroh Shutoh,Takashi Yamanouchi,Syou Kato,Hiroki Yamagishi,Yusuke Ueno,Shiori Hiramatsu,Jun Nishihiro,Takashi shiga 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.3
A small semiartificial pond, revealing high species richness with respect to the aquatic macrophytes, was studied in the Aomori Prefecture, Japan. The pond had been completely formed ca. 10 years previously after excavation into a wet bog. To identify and evaluate its aquatic macrophyte flora during 2017–2018, we listed the species of aquatic vascular plants and charophytes in the pond and compared this list with those from the natural Japanese lakes using a database of aquatic flora in Japan. Two species were identified by molecular analyses because they lacked any reproductive organs, which were necessary for identifying the species level. We found a total of 57 taxa of aquatic macrophytes including 15 Red List species in Japan or Aomori Prefecture. Comparing the flora list with those from the 66 natural Japanese lakes surveyed since 2001, the pond was ranked fourth in the order of diversity (based on species richness) and rarity (based on numbers of Red List species). Therefore, the pond is an important aquatic environment in terms of aquatic macrophyte conservation in Japan. Interestingly, for a pond with such high species diversity, it is relatively small (0.14 km2), semiartificial, and relatively recently formed.
Kazumasa Tsubota,Kohtaroh Shutoh,Syou Kato,최혁재,Takashi shiga 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.1
The aquatic plant Sagittaria aginashi, which is an endangered emergent species distributed in SouthKorea, Japan, and the Russian Far East, has an unclear phylogeny and genetic structure. Phylogenetic treesof Sagittaria were constructed based on one nuclear ribosomal DNA (nrDNA) region and on threechloroplast DNA (cpDNA) regions. S. aginashi was included in a clade comprising three endemic ChineseSagitarria species characterized by the presence of small tubercles at the base of the axils. Furthermore,phylogenetic trees based on cpDNA sequences indicated that S. aginashi was more closely related toS. tengtsungensis than to two other species. S. aginashi exhibited little genetic variation, suggesting thatthis species had rapidly spread in these areas. With regard to factors associated with the rapid spread, weconsidered that multiple dispersal methods were involved, namely hydrochory via tubercles, endozoochorous long-distance dispersal, and anthropogenic impacts of rice farming on S. aginashi dispersal.