Facskó Ferenc (szerk.) (2012): Kutatások a Nyugat-magyarországi

Kutatások a Nyugat-magyarországi Egyetemen
study was to reconstruct of fl ood events by its eff ect on cladoceran community.
Sediment core of Marótzugi-Holt-Tisza was analysed for reconstruction of Cladocera
community and for determine fl ood events. Flood were defi ned as fi ne sand (50 μm grain
size) portion. When fi ne sand portion was less than 3% we defi ned the water regime of the
oxbow as lentic, otherwise it was lotic. Occurred species are common and occurring in all
type of water bodies in Hungary. From the core, 34 Cladocera species were described. These
species are very common in littoral habitats of eutrophic shallow lakes with dense macrophytes.
Discriminant analysis was done on the cladoceran data to confi rm lotic/lentic water
regime changing. Our result revealed Cladocera species can use to trajectory of regime
lotic/lentic changes of water.
KORPONAI J. – VARGA K. – LENGRÉ T. – PAPP I. – TÓTH A. – BRAUN M. (2011): Paleolimnological
reconstruction of the trophic state in Lake Balaton (Hungary) using Cladocera remains.
Hydrobiologia 676: 237-248.
Abstract – 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
identify trophic stages from ~250 BC to present. Dates of themost recent eutrophic events
are in good agreement with previously published data. In general, the abundance and diversity
of the Cladocera community increased eutrophication and decreased with oligotrophication.
The sediments of Lake Balaton were characterised by Chydoridae remains, of which
Alona species werethe most abundant. Of these, Alona quadrangularis and Alona affi nis accounted
for 40 and 20% of the total Cladocera remains, respectively. The trophic state of
Lake Balaton varied between mesotrophic and eutrophic regimes. Seven diff erent trophic
periods wereidentifi ed in Lake Balaton on the basis of Sedimentary Pigment Degradation
Unit (SPDU) content of thesediment. Eutrophic states were (1) from ~250 to ~30 BC, (3)
between ~300 and ~590 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 confi rmed these historic events, except for the short
mesotrophic episode between 1944 and1960. The fi rst stage of eutrophication of Lake Balaton
(~250 to ~30 BC) was characterised by extensivemacrophyte vegetation, as indicated by
the increasing abundance of vegetation-associated Cladocera species (Eurycercus lamellatus,
Sida crystallina, Pleuroxus sp.). Intensifi cation of eutrophication was identifi edsince
the 1980s, refl ected by a high abundance ofBosmina species. The most signifi cant planktivorousfi
sh of Lake Balaton was the Sabre carp (Pelecuscultratus), and when its number
decreased, the abundance of Bosmina species increased. This study showsthat Cladocera
are responsive to trophic state changes, underlining their importance as a tool for the assessmentof
lake eutrophication.
KORPONAI J. – MAGYARI E. – BUCZKÓ K. – IEPURE S. – NAMIOTKO T. – CZAKÓ D. – KÖVÉR C. – BRA-
UN M. (2011): Cladocera response to Late Glacial to Early Holocene climate change in a
South Carpathian mountain lake. Hydrobiologia 676: 223-235.
Abstract – This study explores changes in cladoceran composition in a high mountain lake
of the Retezat (Lake Brazi), the South Carpathian Mountains of Romania, during the Late
Glacial–Early Holocene (14,500–11,600 cal. yr. BP) transition using a paleolimnological approach.
The lake had a species poorcladoceran community throughout this period. Daphnia
longispina, Chydorus sphaericus and Alona affi nis were the most common, showing marked
fl uctuations in their relative abundances through time. Distinctfaunal response to warming
at the Younger Dryas (YD)/Preboreal transition was recorded by increasingfossil densities
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