Thecamoebians from recent lake sediments from the Å umava Mts, Czech Republic.

Bulletin of geosciences

Lorencová M¹ 

关键词: testate amoebae;    thecamoebians;    actuoecology;    statistical analysis;    Å umava Mts.;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

Assemblagesofthecamoebians(testateamoebae)werestudiedinforty-sixsurfacesamplesofrecentbottomsedimentsfromfivelakesintheŠumavaMts,CzechRepublic.Altogether,twelvespeciesofthecamoebianswithanorganicwallwereidentified.Themostabundantspecies,containedin96%ofsamples,wasDifflugiaglobulus.OthercommonspecieswereDifflugiaoblongaandCentropyxisorbicularis.Usingclusteranalysisitwaspossibletodistinguishthreemainthecamoebianassemblages.TheDifflugiaglobulusassemblage(66-100%ofD.globulus)dominatesinPlešnéLake,characterizedbyahigherphytoplanktoncontent.TheDifflugiaglobulusdiversifiedcluster(4-64%ofDifflugiaglobulus,3-8speciesintotal)hasthegreatestspeciesdiversityanddominatesinLakaLake,characterizedbythelowestphytoplanktonbiomass.ThetransitionalDifflugiaglobulusandPontigulasiacompressacluster(55-78%ofDifflugiaglobulus,12-32%ofPontigulasiacompressa)occursinlakeswithmediumvaluesofphytoplanktonbiomass(Černé,Čertovo,Prášilskélakes).AllthespeciesfoundshouldbeadaptabletolowpH(<6)becauseofthelongtermacidityoftheinvestigatedlakes.ThespeciesDifflugiaglobulus,DifflugiaoblongaandCentropyxisorbicularisarecharacteristicfortheselakes.TheinvariablemorphologyofCentropyxisorbicularissimplifiesitsidentificationandmakesthisspeciesagoodcandidateasapalaeoenvironmentalindicator.AcomparisonofrecentlyevidencedtaxawiththedatafromČernéLakeandČertovoLakepublishedbyFričVávra(1898)wasalsomade.Sixnewspecieshavebeenfoundintheselakes(Euglyphaacanthopora,Centropyxisorbicularis,Centropyxisconstricta,Difflugiaviscidula,Nebelavitraea,Pontigulasiacompressa).

【 授权许可】

Unknown