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Kohtaroh Shutoh,Tomoki Hirose,Takashi Shibahara,Takashi Shibahara,Mami Yamazaki,Takashi shiga 국립중앙과학관 2022 Journal of Asia-Pacific Biodiversity Vol.15 No.4
Potamogeton praelongus Wulfen is an aquatic macrophyte that is critically endangered in Japan. Althoughit is widely distributed throughout the boreal climatic zone, several European countries also recognize itas an endangered species. In Japan, it was once widely distributed throughout Hokkaido but has dis appeared or reduced in abundance at its known locations. During 2020e2021, we discovered five newlocations of this species in Wakkanai-shi and Sarufutsu-mura, Northern Hokkaido. Growing conditionsmust be suitable for this species in three of the five locations as it is present with several reproductiveshoots or is widely distributed in source pond or lake. However, conditions were poor in the other twolocations because few shoots were found or plants were observed only in 2020. Environmental condi tions in the new locations were similar to those reported in Europe and North America. In three of thefour locations at Wakkanai-shi, P. praelongus was distributed mainly along the eastern shore facing sanddunes or hills, suggesting that the distribution of this species depends on groundwater springs flowingfrom sand dunes or hills. Further populations may be discovered in the future by intensively surveyingareas near springs since many sand dune lakes and similar environments are present in Hokkaido.