Origins of ex situ populations of Nuphar subintegerrima and Nymphaea tetragona in Nagoya, Aichi, Japan

Abstract

We estimated the origins of Nuphar subintegerrima and Nymphaea tetra- gona, ex situ populations cultivated at Meijo University and Nagoya Higashiyama Zoological Park in Nagoya, Aichi Prefecture, Japan. The results of our interview research indicated three possible origins: Nu. subintegerrima and Ny. tetragona from Otama Pond in Yagoto-Urayama, Tenpaku, Nagoya (Origin A, cultivated at Meijo University), Nu. subintegerrima from Tenpakukei Wetland (or a surrounding wetland) in Yagoto-Urayama (Origin B, cultivated at Meijo University), and Nu. subintegerrima from anonymous Wetland in Yagoto-Urayama (Origin C, cultivated at Nagoya Higashiyama Zoological Park). In the results of the specimen research, we found specimens of Nu. subintegerrima and Ny. tetragona from Otama Pond collected during the 1970–1980’s. Consequently, we judged that Origin A represents the Nagoya populations. Wild populations of Nu. subintegerrima and Ny. tetragona were extirpated from Nagoya, therefore the knowledge of the populations origin is important for biodiversity conservation in Nagoya.