Seasonal changes in abundance and vertical distribution of Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina in Lake Biwa.
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概要
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<I>Mesocyclops thermocyclopoides</I>, <I>Cyclops vicinus</I> and <I>Daphnia longispina</I> were collected in the north basin of Lake Biwa at approximately weekly intervals from 1984 to 1986. <I>M. thermocyclopoides</I> became abundant during the stagnation period (May to October), and <I>C. vicinus</I> during the circulation period (November to April). Diapause was suggested for <I>M. thermocyclopoides copepodite</I> stage IV (CIV) during the circulation period, and for <I>C. vicinus</I> CIV and CV during the stagnation period. <I>D. longispina</I> was almost continuously abundant from April 1984 to December 1985. But in 1986, it became abundant only in August. The large individuals of <I>D. longispina</I> never became abundant. <I>M. thermocyclopoides</I> and <I>D. longispina</I> were confined to the epilimnion during the stagnation period, and <I>C. vicinus</I> and <I>D. longispina</I> were distributed throughout the water column during the circulation period. Interspecific relations among planktonic crustaceans were discussed on the basis of their life histories.
- 日本陸水学会の論文
日本陸水学会 | 論文
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