Occurrence of aquatic hyphomycetes in urban and suburban spring and pond water

Abstract

Seven and five species of aquatic hyphomycetes were obtained from spring water of Koganei-shi and Kokubunji-shi in a suburb of Tokyo and from pond water of Shinobazu Pond in the center of Tokyo, respectively in November, 2005. The former seven species were Alatospora acuminata, Lunulospora curvula, Lu. cymbiformis, Tetrachaetum elegans, Tripospermum camelopardus, Trip. myrti and Triscelophorus monosporus, and the latter five were Al acuminata, Anguillospora longissima, Clavatospora tentacula, Lemonniera aquatica and Tetracladium marchalianum. In the microscopic view, the fungi underwater were sporulating on dead maple (Acer palmatum) leaves that had been submerged for 3 to 10 days in meshed plastic bags after aseptic microwave treatments of the leaves. Shinobazu Pond has at least three underground inlets of water, and three of the four sites where the fungi were obtained were close to the water inlets. From the inlets, water flows in continuously or does so at an interval of between one and two months. The dissolved oxygen (DO, in mg/) and pH of the pond water at all sites examined were much higher than those of the three spring water sites in Koganei-shi and Kokubunji-shi.