Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 80. (Budapest 1988)

Forró, L.: The occurence of Moina salina Daday, 1888 (Cladocera) in a sodic pan in Hungary

Moina brachiata (along with Arctodiaptomus spinosus, which is a specialist of sodic waters) was considered as a typical species of the summer plankton in sodic pans in Hungary (MEGYERI 1959). My studies on Szappanosszék and other sodic waters confirmed this statement, as this species was found in summer even in less saline pans. In Neusiedlersee, a permanent shallow, sodic lake, salinity decrease resulted in a change of the species composition, M. brachiata was replaced by Diaphanosoma brachyurum (HERZIG, 1979). The salinity and alkalinity tolerance values given by LÖFFLER (1961), the above-mentioned data and their comparison with those given by ALONSO (1983) suggest that M. brachiata also prefers at least moderate salinity but also great values of alkalinity, while M. salina tolerates very high salinity and is capable to cope with great alkalinity. The occurrences in a given habitat are also dependent on biological interactions. Competition is certainly very important which is suggested by the observed changes in Lake Neusiedlersee, Aral Sea, and — I think — also in Szappanosszék, and would certainly deserve further study. References ALADIN, N. V. & ANDREEV, N. I. (1984): Effect of salinity of the Aral Sea concerning the changes of the Cladocera fauna. — Gidrobiol. Zh. 20(3): 23-28. (In Russian.) ALONSO, M. (1983): Contribució al coneixement del genere Moina a la peninsula Iberica. — Bull. Inst. Cat. Hist. Nat. 49 (Sec. Zool., 5): 41-48. ALONSO, M. & COMELLES, M. (1984): A preliminary grouping of the small epicontinental water bodies in Spain and distribution of Crustacea and Charophyta. — Verh. int. Ver. Limnol. 22: 1699-1703. DUMONT, H. J. (1981): Kratergöl, a deep hypersaline crater-lake in the steppic zone of westernAnatolia (Turkey), subject to occasional limno-meteorological perturbations. — Hydrobiologia 82: 271-279. FORRÓ, L. (1985): A new species of Moina from Australia (Crustacea: Cladocera). — Acta zool. hung. 31: 111-118. GAUTHIER, H. (1954): Essai sur la variabilité, l'écologie, le déterminisme du sexe et la reproduction de quelques Moina (Cladoceres) récoltées en Afrique et a Madagascar. — Alger, p. 1-246. HERZIG, A. (1979): The Zooplankton of the open lake. — In: H. LÖFFLER (ed.), Neusiedlersee, the limnology of a shallow lake in Central Europe. Dr Junk, The Hague: 281-335. LÖFFLER, H. (1961): Beiträge zur Kenntnis der iranischen Binnengewässer II. Regional-limnologische Studie mit besonderer Berücksichtigung der Crustaceenfauna. — Int. Revue ges. Hydrobiol. 46: 309-406. MARGARITORA, F. G. (1971): Sulla presenza di Moina mongolica Daday, 1901 nelle Sardegne occidentale. — Riv. Idrobiol. 10: 5-10. MEGYERI, J. (1959): Az alföldi szikes vizek összehasonlító hidrobiológiái vizsgálata. [The comparative hydrobiological examination of the sodic waters of the Hungarian Great Plain.] — Acta acad. paed. Szeged 1959/11: 91-170. MEGYERI, J. (1975): A fülöpházi szikes tavak hidrozoológiai vizsgálata. [Hydrozoological investigations on the sodic pans near Fülöpháza.]. — Acta acad. paed. Szeged 1975/11: 53-72. NEGREA, ST. (1983): Cladocera. — Fauna Republicii Socialiste Romania, Crustacea 4(12): 1-399. NEGREA, ST. (1984): Redescription de Moina salina Daday, 1888 (Cladocera, Moinidae) d'après des exemplaires trouves en terra typica. — Crustaceana 47: 83-97. SUKHANOVA, E. R. (1971): Moina microphthalma (Cladocera, Daphniidae) under ultrahaline conditions in the North Caucasus. — Zool Zh. 50: 285-287. (In Russian.) Author's address: DR. LÁSZLÓ FORRÓ Zoological Department Hungarian Natural History Museum H-1088 Budapest, Baross utca 13 Hungary