Evolution of the palaeolake at Ruszkówek (central Poland) during the Eemian Interglacial based on isotope,cladoceran and diatom data |
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| Authors: | Joanna Miros?aw-Grabowska Monika Niska Elwira Sienkiewicz |
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| Institution: | 1.Institute of Geological Sciences, Polish Academy of Sciences,Warsaw,Poland;2.Institute of Geography Pomeranian,Pedagogical University,Slupsk,Poland |
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| Abstract: | We present isotope, cladoceran and diatom results from investigations of Eemian sediments of the palaeolake at Ruszkówek,
central Poland. Our analyses of the 15-m-thick sediments indicate that sandy silts occur on the bottom, followed by calcareous
gyttja, interbedded with lake marl. The upper part of the sequence contains peat and peaty sands. Values of δ18O change from −9.4‰ to −3.3‰ and δ13C values oscillate between −3.2‰ and +7.0‰. Nine isotope zones (Is) were defined and characterized using stable isotope analysis
of carbonates. Fifteen species of subfossil Cladocera were found and six faunal zones were distinguished (Cladocera zones).
One hundred and twenty-three diatom taxa, representing 31 genera were identified, enabling us to discern six Diatom Assemblage
Zones. The isotope, cladoceran, and diatom data correlate well with pollen data that define seven phases of evolution of the
palaeolake at Ruszkówek. The palaeolake began during the final phase of the Wartanian (Late Saalian Glaciation). During the
early Eemian, the palaeolake reached its maximum depth. During the Early Vistulian glaciation, the palaeolake declined. Changes
in the cladoceran and diatom communities indicate initial oligotrophic conditions in the lake, then an increase to mesotrophy,
and finally eutrophic conditions. |
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