Occurrence of Rotifera in the field under natural and intentionally-changed conditions. II. Lake Numasawa
Seasonal and vertical occurrences of representative rotifer species were recorded together with such taxa as Cyanophycea, Phytomastigophorea, Bacillariophycea, Protozoa, Rotifera and Crustacea, from 1982 to 1986 at two sites S1 (natural) and S2 (nearby water circulated since 1952). 1) The following species were observed from S1: K. hiemalis, C. ovalis, N. labis, L.patella and Anuraeopsis sp., from S2: B. urceolaris and A. ecaudis, 2) P. hudsoni appeared in 1984 as a successor to P. truncatum, 3) K. longispina was negatively associated with P. t. vulgaris, 4) Synchaeta spp suddenly appeared at both sites in 1985, 5) K. cochlearis, B. calyciflorus, Proalides sp., Diurella sp., N. labis, B. urceolaris and bdelloids did not appear until 1986, 6) The following species decreased or disappeared: A. p. herricki and Collotheca sp. since 1982, C. coenobasis, C. hippocrepis and K. hiemalis since 1984, 7) A complicated relation was observed between rotifer population density and other plankton. 8) Occurrence of Rotifera seemed to be affected by circulation of an electric power plant.
Key wordsseasonal-vertical occurrences power-water circulation saprobic rotifers
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- Carlin, B., 1943. Die Planktonrotatorien des Motalaström. Medd. Lunds Univ. Limnol. Inst. 5: 1–256.Google Scholar
- George, M. G. & C. H. Fernando, 1969. Seasonal distribution and vertical migration of planktonic rotifers in two lakes. Verh. int. Ver. Limnol. 17: 817–829.Google Scholar
- Larsson, P., 1971. Vertical distribution of planktonic rotifers in a meromictic lake. Norw. J. Zool. 19: 47–75.Google Scholar
- Pejler, B., 1957. Taxonomical and ecological studies on planktonic Rotatoria from northern Swedish Lapland. K. svensk Vetensk Akad. Handl. 4: 3–52.Google Scholar
- Sladeček, V., 1973. System of Water quality from the biological point of view. Ergeb. Limnol. 7: 218 p.Google Scholar
- Sudzuki, M., 1955. Life histories of some Japanese rotifers I. Polyarthra trigla. Sci. Rep. Kyoiku Daigaku 118: 41–64.Google Scholar
- Sudzuki, M., 1962. Class Rotatoria. In: Uchida Ed. Systematic Zoology 2: 9–74 (Nakayama-shoten, Tokyo).Google Scholar
- Sudzuki, M., 1989. Rotifera from the Oriental region and their characteristics. Special Issue for Centennial Anniversary of Nihon Daigaku 3: 301–343.Google Scholar
- Varga, L., 1954. A relict of the ice age in the water fauna of lake Balaton. Annal. Biol. Tihany 22: 227–234.Google Scholar