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Changes in habitat conditions in a Late Glacial fluviogenic lake in response to climatic fluctuations (Warta River valley, central Poland)

Forysiak Jacek, Okupny Daniel, Obremska Milena, Antczak-Orlewska Olga, Płóciennik Mateusz, Pawłowski Dominik, Baradyn Daria, Kotrys Bartosz, Luoto Tomi P., Nevalainen Liisa, Borówka Ryszard K.

Geological Quarterly

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2023

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Vol. 67, No. 1

art. no. 1

EN

The Warta River valley was greatly influenced by the ice sheet of the Last Glacial Maximum (LGM). A small peatland located in the Warta drainage system is here used as a palaeoarchive of climatic and habitat changes during the Late Glacial (Weichselian). The Ługi sediment profile was investigated using multi-proxy (pollen, Chironomidae, Cladocera and geochemistry) analyses that recorded changes in a fluviogenic sedimentary depression. After the Poznań Phase (LGM), Ługi functioned as an oxbow lake that was cut off from the active river channel as a result of fluvial erosion. Since that time, the Warta River has flowed only along the section now occupied by the Jeziorsko Reservoir. Sedimentation of lacustrine deposits started at the beginning of the Late Glacial. Summer temperature reconstructions indicate cool Oldest and Younger Dryas, but no clear cooling in the Older Dryas. During the Younger Dryas the palaeolake was completely occupied by a peatland (fen), which periodically dried out during the Holocene. Investigation of this site has tracked the reaction of the habitat to climatic, hydrological and geomorphological changes throughout the Late Weichselian.

2

Late Glacial palaeoenvironmental changes in the southern part of the Holy Cross Mountains based on the "Białe Ługi" peatland record

Okupny Daniel, Malkiewicz Małgorzata, Pawłowski Dominik, Ludwikowska-Kędzia Małgorzata, Borówka Ryszard Krzysztof, Forysiak Jacek, Michczyński Adam, Jucha Witold, Cybul Piotr, Żurek Sławomir

Studia Quaternaria

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2019

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Vol. 36, Nr 2

119--135

EN

This paper presents the Late Glacial stage of the development of the Białe Ługi peatland in the southern Holy Cross Mountains, based on a comprehensive palaeoenvironmental data. A complex analysis of palynology, Cladocera, sedimentology, geochemistry and 14C dating were used. Organic deposition was initiated during the Oldest Dryas. The sedimentary record of the aquatic and terrestrial ecosystems reflects considerable difference between cooler (Oldest, Older and Younger Dryas) and warmer phases (Bølling and Allerød). Periods of intensified interaction between Aeolian processes and peatland are related to stages of disappearing vegetation and changes in aquatic invertebrate communities. We therefore suggest that peatlands were created as a result of local lithological-structural, tectonic, hydrogeological and morphological conditions, and the peatland development rate was largely influenced by changing climatic conditions, which determined local vegetation development, intensity of denudation processes and water level changes. The results validate significance of selection and use of several methods, as well as value of biogenic deposits from the Białe Ługi peatland as archives of past climate change in the Małopolska Upland. Relatively stable water conditions and uninterrupted biogenic sedimentation in the Late Glacial that were provided by the geological structure and relief suggest the studied peatland is a leading one in the region.

3

Badanie przyspieszeń pojazdów samochodowych

Adamski Rafał, Pawłowski Dominik:

Drogownictwo

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2019

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nr 9

268--270

PL

Każdy poruszający się po drogach samochód ma ściśle określone przez producenta parametry przyśpieszenia, prędkości maksymalnej, mocy i momentu obrotowego. W literaturze motoryzacyjnej badana jest często elastyczność pojazdu w wybranym przedziale prędkości na danym przełożeniu. Testy faktycznego przyśpieszenia samochodu z wykorzystaniem różnych prędkości obrotowych nie są wykonywane. Kluczem do stwierdzenia jak dany pojazd będzie przyśpieszał jest jego wykres zależności mocy i momentu od obrotów silnika. Poddano badaniom cztery różne samochody z różnymi silnikami chcąc porównać ich przyśpieszenie zależnie od wykorzystania 70, 85 i 100% ich prędkości obrotowej maksymalnej mocy silnika. Pojazdy były badane na odcinku drogi o długości 500 metrów przy prędkości od 30 km/h do 120–130 km/h.

EN

Each car travelling on the road has strictly defined parameters of acceleration, maximum speed, power and torque. In automotive literature, vehicle flexibility is often tested within a selected speed range in a given gear ratio. Tests of the actual acceleration of a car using different speeds are not performed. The key to determining how a given vehicle will accelerate is its power and torque vs. engine revolutions diagram. Our different cars with different engines were tested to compare their acceleration according to the use of 70, 85 and 100% of their maximum engine power speed. The vehicles were tested on a 500-metre-long road section at speeds ranging from 30 km/h to 120–130 km/h.

4

Younger Dryas Cladocera assemblages from two valley mires in central Poland and their potential significance for climate reconstructions

Pawłowski Dominik

Geologos

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2012

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Vol. 18, No. 4

237--249

EN

Two sections of sediment from small oxbow-lake infillings located in different river valleys in central Poland were studied by cladoceran analysis in order to examine the response of aquatic ecosystems to the Younger Dryas. Lithological and geochemical records, as well as chydorid (Chydoridae) ephippia analysis were also used to reconstruct Younger Dryas climate trends. A high concentration of cladocerans, as well as the presence of Cladocera taxa preferring warmer water, was found. It is likely that local processes in the oxbow lakes were important, because the presence of warm-preferring taxa was also related to their habitats and their development. Yet local environmental forces, such as the influence of the rivers, habitat modification, macrophyte abundance, and eutrophication, were not only major factors to affect the Cladocera diversity in the Younger Dryas. The observation of changes in the composition and concentration of Cladocera in oxbow-lake infillings indicates that most of the changes occurred in response to climate changes.