L. Forró szerk.: Miscellanea Zoologica Hungarica 7. 1992 (Budapest, 1992)
Gulyás, P.; Forró, L.: Composition and abundance of microcrustacean fauna in the Upper Reservoir (Hídvégi-tó) of the Kis-Balaton
Discussion The composition of planktonic crustacean communities has changed considerably in the years following the filling of the lake. The water quality regions distinguished in the first years gradually disappeared. The number of species, and the diversity of species communities decreased. At the same time, individuals of one or other species often formed great populations. During the last two years of these studies Moina micrura, Bosmina longirostris and Acanthocyclops robustus £ limnetica attained great abundance. The other species occurred sporadically (Table 3). Table 3. Planktonic occurrence of Cladocera and Copepoda species Cladocera 1985 1986 1987 1988 1989 Alona costata Sars, 1862 + + Alona guttata Sars, 1862 + Alona rectangula Sars, 1862 + + + + Alonella excisa (Fischer, 1854) + + Alonella exigua (Lilljeborg 1853) + + Bosmina longirostris (O.F.Müller 1785) + + + + + Ceriodaphnia quadrangula (O.F.Müller 1785) + + + + + Chydorus sphaericus (O.F.Müller 1785) + + + + + Daphnia hyalina Leydig, 1860 + + + Daphnia longirostris O.F.Müller 1785 + + + + + Daphnia magna Straus, 1820 + Diaphanosoma brachyurum (Liévin, 1848) + + + Disparalona rostrata (Koch, 1841) + + + Dunhevedia crassa King, 1853 + Iliocryptus sordidus (Liévin, 1848) + Leydigia leydigi (Schoedler, 1863) + Leptodora kindtii (Focke, 1844) + Macrothrix hirsuticomis Norman et Brady, 1867 + + + Moina micrura Kurz, 1874 + + + + + Oxyurella tenuicaudis Sars, 1862 + + Pleuroxus aduncus (Jurine, 1820) + + + Scapholeberis aurita (Fischer, 1849) + + Scapholeberis mucronata (O.F.M. 1785) + + + Simocephalus vetulus (O.F.M. 1776) + + + Tretocephala ambigua (Lilljeborg, 1900) + Copepoda Calanoida Eudiaptomus gracilis (Sars, 1863) Eudiaptomus vulgaris (Schmeil, 1869) Cyclopoida Acanthocyclops robustus f. limnetica Petkowski, 1976 Cyclops strenuus strenuus Fischer, 1851 Cyclops vicinus vicinus Ulianine, 1875 Eucyclops serrulatus (Fischer, 1851) Eucyclops speratus (Lilljeborg , 1901) Macrocyclops albidus (Jurine, 1820) Megacyclops viridis (Jurine, 1820) Mesocyclops leuckarti (Claus, 1857) Thermocyclops oithonoides (Sars, 1863) Thermocyclops crassus (Fischer, 1853) Number of species: + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + 30 27 19 16 23
