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Palaeohydrological aspect of transformation of lakes into peat bogs during middle holocene on the basis of cladocera analysis in the northern Poland

100%

Szeroczyńska K. , Gąsiorowski M.

tom Vol. 19

55--60

Cladocera are a group of water animals, which are strongly dependent on environmental conditions. The ratio of planktonic to littoral Cladocera species is a widely used tool in palaeohydrological reconstruction of lakes' water level changes. Interpretation of this ratio is still unclear and requires further evidence. The simplest indicator of water level, which can be used in tracing lake-peat bog transitions, is the presence or absence of Cladocera and the character of its disappearance. In general, two models of Cladocera decline are observed. The first model is characterized by a very abrupt disappearance of all species, whereas the second one, with an intermediate stage, is characterized by domination of specific species. These two models are related to different types of terminal history of the water body. Even after a total disappearance of water in the peat bogs, there were episodes of some pioneer cladoceran species presence, correlated with periods of humid climate.

Lateglacial-Middle Holocene stable isotope records in two coeval stalagmites from the Bihor Mountains, NW Romania

75%

Tamaş T. , Onac B. P. , Bojar A. V.

2005

tom Vol. 49, No. 2

185-194

Oxygen and carbon stable isotope records of two stalagmites from NW Romania provide a continuous climatic record between 14.8 and 5.6 ka BP. The chronology is established by 21 TIMS uranium series ages. Uncertain ties in the isotope chronology range between ±20 and ±100 yr. The δ18 O values are positively correlated with temperature, whereas δ13 C fluctuations suggest changes in soil CO2 production. Lateglacial deposition of both stalagmites started at ~14.8 ka BP. The delta 18 O records subsequently show a slow decline in temperatures until 12.6 ka BP. Three warmer periods with increased soil productivity occurred at 14.5-13.9 ka BP, 13.6-13.2 ka BP, and 12.9-12.6 ka BP. Lower delta 18 O and high δ13 C values between 12.6 and 11.4 (11.7) ka BP in dicate a cold and dry climate during the Younger Dryas (GS-1). During the Early Holocene, three short cold intervals are marked on the δ 18 O profiles at 11.0-10.6, 10.5-10.2 and 9.4-9.1 ka BP. For the remainder of the Holocene sequence, the δ18 O records show less variation between 9 and 7.8 ka BP and gradual warming from 7.6-5.6 ka BP. The speleothem records correlate with the Green land ice core records and with other proxies through out Europe and the North Atlantic region.

Diatom biofacies in the SW Gulf of Gdansk and the Vistula Lagoon (the Southern Baltic Sea) as indicators of the basin evolution in the Middle and Late Holocene

63%

Witak M.

Oceanological and Hydrobiological Studies

2013

tom 42

nr 1

Malacofauna in cave deposits of the Udorka valley (Krakow-Czestochowa Upland)

63%

Szymanek M. , Krajcarz M. T. , Krajcarz M. , Sudol M.

Folia Malacologica

2016

tom 24

nr 1

Bird remains from the Eneolithic and Iron Age site Bordusani-Popina and Eneolithic site Harsova [Southeast Romania]

51%

Gal E. , Kessler E.

tom 45

nr Spec.issue