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Seasonal changes in abundance and vertical distribution of Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina in Lake Biwa.

1989; Volume: 50; Issue: 1 Linguagem: Inglês

10.3739/rikusui.50.9

1882-4897

Keiichi Kawabata,

Marine and coastal ecosystems

Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina were collected in the north basin of Lake Biwa at approximately weekly intervals from 1984 to 1986. M. thermocyclopoides became abundant during the stagnation period (May to October), and C. vicinus during the circulation period (November to April). Diapause was suggested for M. thermocyclopoides copepodite stage IV (CIV) during the circulation period, and for C. vicinus CIV and CV during the stagnation period. D. longispina was almost continuously abundant from April 1984 to December 1985. But in 1986, it became abundant only in August. The large individuals of D. longispina never became abundant. M. thermocyclopoides and D. longispina were confined to the epilimnion during the stagnation period, and C. vicinus and D. longispina were distributed throughout the water column during the circulation period. Interspecific relations among planktonic crustaceans were discussed on the basis of their life histories.