コケ沼ミズゴケ湿原(秋田県)における卵菌類遊走子の分布

概要

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The distribution of Oomycetes zoospores was investigated in the Kokenuma Sphagnum bog at the west foot of Mt. Kurikoma (the Kurikoma quasi-national park, Akita Prefecture). Oomycetes floras in the dystrophic acid water (pH 3.0-4.2) in Sphagnum communities were different from those in the dystrophic acid waters of ponds in the bog (Blanken) (pH 4.2-6.0) and a circumferential pond (pH 4.3-6.0) at the edge of the bog ; i.e., Saprolegnia turfosa was dominant in the former, whereas Achlya flagellata, A. racemosa, A. treleaseana, S. diclina were dominant in the latter two water areas. S. turfosa is believed to be adapted to the dystrophic acid water in Sphagnum communities. The density of Oomycetes zoospore, which is considered as an indicator of their potential growth, was+〜1/10 ml in the dystrophic acid water in Sphagnum communities, +〜2/10ml in the dystrophic acid waters of ponds (Blanken) and +〜5/10ml in the dystrophic acid water of the circumferential pond. These zoospore densities were much less than those previously reported in non-acid rivers and lakes.
1986-08-31