Diatom assemblages in the moat around Takashima Castle, Suwa City, Nagano Prefecture

Abstract

The diatom flora in the moat around Takashima Castle, Suwa City, Nagano Prefecture, was studied in January 2009. A total of 48 diatom species belonging to 26 genera were identified. The predominant genera were Navicula and Nitzschia represented by six and five species, respectively. Aulacoseira ambigua (Grunow) Simonsen was dominant. Rhopalodia gibba var. ventricosa (Kütz.) H.Perag. & Perag., Epithemia sorex Kütz. and Cyclostephanos dubius (Fricke) Round were also abundant.