Two Different Forms of Ceratium hirundinella (O. F. MÜLLER) SCHRANK and their Seasonal Occurrence
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概要
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Three freshwater ponds, namely, Kita-ike, Minami-ike and Gunkoh-ike, are located in the Ritsurin Park, Kagawa Prefecture, the former two ponds having the waters rich in chloride and calcium, while the third is rich in organic matter.<BR>Cells of Ceratium hirundinella (O. F. MÜLLER) SCHRANK which occurs in Kita-ike and Minami-ike are provided with one apical and two anta-pical horns of considerable lengths, while in Gunkoh-ike they develop into short ones. The former two may be called Kita-ike-form and the latter Gunkoh-form. The Kita-ike-forni closely resembles in. shape to the so-called Gracile-form which is widely distributed in lakes and ponds in the lowland. The Gunkoh-form is very near to Brachycercoides-form. The Kita-ike-form is most abundant and the largest in size in early summer, while the Gunkoh-form occurs from summer to autumn and is the smallest in size in mid-summer.
- 日本陸水学会の論文
日本陸水学会 | 論文
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