中海本庄水域の植物表生珪藻(1) : 宿主植物による種組成の違い

Epiphytic diatom assemblages from Lake Nakaumai, a large brackish lake in Japan, were studied. Samples were collected from three different hosts: Sargassum thunbergii, Gracilaria vermiculophylla, and Zostera japonica. Seventeen diatom taxa were taxonomically studied based on LM- and SEM-observtions. Three pairs of taxonomically confused taxa were re-examined in detail: Achnanthes brevipes var. intermedia and A. kuwaitensis, Cocconeis scutellum and C. speciosa, and Tabularia tabulata and T.parva. The diatom species composition on Z.japonica was clearly different from those on the other hosts: C. scutellum was always dominant on Z.japonica, whereas, C.speciosa was usually dominant on S. thumbergii and on G. vermiculophylla.