御蔵島および八丈島の細胞性粘菌類

概要

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The dictyostelid biota was investigated in Mikurajima Island and Hachijojima Island belonging to the Izu Islands located in the warm-temperate zone. Fourteen taxa were obtained from the both islands. Nine of them were identified with known species; Dictyostelium aureo-stipes, D. delicatum, D. monochasioides, D. mucoroides, D. polycephalum, D. purpureum, D. robustum, Polysphondylium candidum and P. violaceum. Another two were species complex: the Dictyostelium brefeldianum complex and the Polysphondylium pallidum complex. And the other three have not been identified yet and were tentatively treated as "Acytostelium sp.", "Dictyostelium monochasioides variant" and "Dictyostelium polycarpum variant". The sum total of species frequencies of dictyostelids was 230-310 in Mikurajima Island and 180-280 in Hachijojima Island. The flora of Izu Islands is characterized by warm-temperate vascular plants mixed with cool-temperate ones. It is interesting for a study of the dictyostelid biota of Izu Islands that D. delicatum, which is mainly distributed in the cool-temperate zone in Japan, was obtained from Mikurajima Island and Hachijojima Island.
2002-12-25