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Oscillations in density and diversity ofPisidium communities in two biotopes in Southern Poland
Authors:Anna Dyduch-falniowska
Institution:(1) Research Centre for the Protection of Nature and Natural Resources, Polish Academy of Science, Ul.Arianacuteska 1, 31-512 Kraków, Poland
Abstract:Summary From September 1979 to October 1980 in two types of biotopes (in the stream at Kalisacute and in the Bialmidota Przemsza River near Jaroszowiec, southern Poland)P.amnicum, P.milium, P.subtruncatum, P.nitidum, P.personatum, P.casertanum andP. sp.non det. were found.P.amnicum was accepted as an indicator species for the river community, andP.milium for the stream. The irregular changes of species composition of the sphaeriid community in the stream at Kalisacute are rather accidental and the only temporary occurrence ofP.nitidum, P.personatum andP. sp.non det. in the Bialmidota Przemsza River might be connected with seasonal migration.The dominance structure of thePisidium community in the stream agrees with the model described by CONNELL (1977) for the communities of large sedentary animals and plants. The dominance relations in the river community are similar to the situation described by CONNELL (1977) as characteristic for small lakes and islands.The density of the Sphaeriidae on the chosen habitat in the Bialmidota Przemsza River oscillated between 300 and 3.300 ind./m2 and it reached almost 130.000 ind./m2 in the stream at Kalisacute.The SHANNON-WIENER's diversity index (Hprime) and that of equitability or lsquoevennessrsquo of species abundances (Jprime) had low values during the whole period of investigation.This study was performed as part of the Problem MRII/15 of the Polish Academy of Sciences.
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