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001-es BibID:	BIBFORM032058
Első szerző:	Korponai János (biológus)
Cím:	Paleolimnological reconstruction of the trophic state in Lake Balaton (Hungary) using Cladocera remains / János Korponai, Katalin A. Varga, Timea Lengré, István Papp, Albert Tóth and Mihály Braun
Dátum:	2011
ISSN:	0018-8158
Megjegyzések:	The sediment of Lake Balaton (Hungary)provides important information about the lake's history,particularly with regard to eutrophication. In this study,we used fossil pigment analysis and subfossil Cladoceraremains preserved in a dated sediment core to identifytrophic stages from 250 BC to present. Dates of themost recent eutrophic events are in good agreementwithpreviously published data. In general, the abundanceand diversity of the Cladocera community increasedwith eutrophication and decreased with oligotrophication.The sediments of Lake Balaton were characterisedby Chydoridae remains, of which Alona species werethe most abundant. Of these, Alona quadrangularis andAlona affinis accounted for 40 and 20% of the totalCladocera remains, respectively. The trophic state ofLake Balaton varied between mesotrophic and eutrophicregimes. Seven different trophic periods wereidentified in Lake Balaton on the basis of SedimentaryPigment Degradation Unit (SPDU) content of thesediment. Eutrophic states were (1) from 250 to30 BC, (3) between300 and590 AD, (5) between1834 and 1944 and (7) from the 1960s until present.Mesotrophic states were (2) 30 BC to 300 AD, (4)590?1834, (6) 1944?1960s.Discriminant analysis of thecladoceran data confirmed these historic events, exceptfor the short mesotrophic episode between 1944 and1960. The first stage of eutrophication of Lake Balaton(250 to *30 BC) was characterised by extensivemacrophyte vegetation, as indicated by the increasingabundance of vegetation-associated Cladocera species(Eurycercus lamellatus, Sida crystallina, Pleuroxussp.). Intensification of eutrophication was identifiedsince the 1980s, reflected by a high abundance ofBosmina species. The most significant planktivorousfish of Lake Balaton was the Sabre carp (Pelecuscultratus), and when its number decreased, the abundanceof Bosmina species increased. This study showsthat Cladocera are responsive to trophic state changes,underlining their importance as a tool for the assessmentof lake eutrophication.[This study was financially supported byHungarian National Science Foundation, OTKA-T 049098 and Hungarian National Research and Development ProgramBALO? KO 3B022/04, TA? MOP 4.2.2-08/1-2008-0020, TA? MOP4.2.1/B-09/1/KONV-2010-0006.]
Tárgyszavak:	Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban Bosmina Cladocera remains Chydoridae Eutrophication Fish Lake Balaton Shallow lake
Megjelenés:	Hydrobiologia. - 676 : 1 (2011), p. 237-248. -
További szerzők:	Varga Katalin A. Lengré Timea Papp István (1980-) (vegyész) Tóth Albert (1966-) (biológus-ökológus) Braun Mihály (1966-) (vegyész, analitikus)
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