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Shougo Nishihara,Takashi shiga,Jun Nishihiro 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.2
Aldrovanda vesiculosa L. is a globally endangered aquatic plant, with only two reintroduced populations known in Japan. In October 2022, we found a population of this species with nearly 10,000 individuals in an agricultural pond in Ishikawa Prefecture. This paper describes the estimated population size, habitat conditions, and the results of a genetic comparison with other populations by comparing its nrDNA (internal transcribed spacer) and cpDNA (trnL intron and trnLetrnF spacer) sequences. All the DNA sequences from voucher specimens and GenBank data, including the population discovered in the present study, were identical. Based on the evidence, we presume that this A. vesiculosa population is a wild one.
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.