Alexandrowicz, Witold Paweł
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Item type:Article, Access status: Open Access , Malacofauna of the Holocene tufa in the valley of the Ociemny Stream (Pieniny Mts., southern Poland)(Wydawnictwa AGH, 2017) Alexandrowicz, Witold PawełA rich molluscan fauna was found in the outcrop of slope sediments and calcareous tufas in the valley of the Ociemny Stream in the Pieniny Mts. The malacological sequence identified there represents the entire Holocene, but it contains several stratigraphical gaps. From this viewpoint, it is a unique finding within the area studied. In nine samples, 11,000 specimens of 71 species of molluscs were identified. The ecological and zoogeographical diversity of the composition and structure enabled the separation of three faunistic assemblages. The oldest assemblage (with <i>Discus ruderatus</i>) corresponds with the cold period of the Early Holocene and represents shadowed habitats overgrown with the coniferous forests of the taiga type. Its characteristic feature is the presence of glacial relics (e.g. <i>Vertigo genesii</i> and <i>Vertigo geyeri</i>). The other younger fauna (with <i>Discus perspectivus</i>) is typical of the humid and warm climate of the Atlantic Phase. It is characteristic of the habitats of mixed and deciduous forests. Numerous Balkan and Mediterranean thermophilous forms appear in this assemblage. The youngest malacoenosis (with <i>Bithynella austriaca</i>) is typical for the historical times. The particular intervals containing molluscan fauna are separated by gaps corresponding to the erosion phases. Because of the land relief in the valley of the Ociemny Stream, which is not conducive to the development of human economy, no marked anthropogenic deforestation occurs.Item type:Article, Access status: Open Access , Zespoły mięczaków w vistuliańskich lessach we wsi Chobrzany koło Sandomierza (południowa Polska)(Wydawnictwa AGH, 2011) Alexandrowicz, Witold PawełMalacological analysis was conducted on shell material from loess profile in Chobrzany village located near Sandomierz. This particular profile represents a vertical wall, up to 6.5 m high. Its upper part is composed of typical, yellow loess with vertical cracks covered by recent soil. In the lower interval the occurrence of poorly visible lamination and carbonate concretions is observed. Six species of snails were identified. These belong to the so-called »loess species«. Several types of molluscan communities can be distinguished on the basis of faunistic changes. These molluscs' assemblages correspond with the palaeoenvironment and they allow for palaeoclimatic and stratigraphical reconstructions. The results of malacological analysis indicate that the loesses in Chobrzany could belong to the youngest loess sequence (Upper Younger Loess), which were deposited during Pleniglacial Phase of Vistulian.Item type:Article, Access status: Open Access , Malakofauna osadów jeziornych torfowiska Gajlik na Pojezierzu Sejneńskim (północno-wschodnia Polska)(Wydawnictwa AGH, 2010) Alexandrowicz, Witold Paweł; Żurek, SławomirMalacological analysis was conducted on snails and bivalve shells present in calcareous gytia and lacustrine chalk of the Gajlik mire in the Sejny Lake District. Thirteen species of water molluscs were identified within six analyzed samples. Changes observed in the structure and composition of molluscs, supplemented by palynological data, and the results of radiocarbon datings allowed for the reconstruction of the mire's evolution during Late Glacial and Early Holocene period. Molluscs' shells occurred solely in sediments associated with warmer periods (interphase Alleröd and Preboreal-Boreal phases of Holocene). Additionally, they were not present in sediments associated with cold Late Glacial periods.Item type:Article, Access status: Open Access , Malakofauna górnoholoceńskich martwic wapiennych w Beskidach Zachodnich (południowa Polska)(Wydawnictwa AGH, 2009) Alexandrowicz, Witold PawełUpper Holocene calcareous tufa occur commonly in the Western Beskidy Mts. Often, at least not always they contain more or less rich and differentiated molluscan assemblages. Malacological analysis was carried out on the basis of material collected from 33 localities represented by 59 samples. The most typical communities of snails and bivalves were characterized. Four types and three subtypes of fauna differing oneself in structure and species composition have been distinguished. Malacofauna recognized in discussed calcareous deposits is closely depended on local conditions. The whole material comprises 68 species, but only a few of them occur in large numbers and in many profiles, while the remaining ones had only accesorical importance. Malacological investigations of Upper Holocene calcareous tufa are important for recognizing mechanisms of deposition such calcareous sediments and differentiation of molluscan assemblages. They can be useful for actuopelaeontological analysis essential for palaeogeographical and palaeoecological interpretations of tufas of Holocene and Late Glacial age occurred in Southern Poland.Item type:Article, Access status: Open Access , Malacological indicators of anthropogenic and natural environmental changes of the Podhale Basin during the last 2000 years. Studies in the Rogoźnik Stream valley (the Carpathian Mountains, Southern Poland)(Wydawnictwa AGH, 2023) Alexandrowicz, Witold Paweł; Skoczylas-Śniaz, Sylwia; Laskowska, PaulinaThe lithological and malacological studies covered sediments forming the low terrace of the Rogoźnik Stream in the northwest part of the Podhale Basin. This terrace is characterised by a uniform structure within a significant part of the valley. Three layers of gravel and four layers of sandy and silty muds were found there. A rich and diversified malacofauna was discovered in fine-grained sediments. Its analysis allowed us to characterise environmental conditions during sediment deposition. The age of the individual components of the sedimentary sequence was determined by radiocarbon dating. A distinct change was found in the upper intervals of the sequence, corresponding to the warm phase of the Medieval Climate Optimum. This period is associated with the robust development of agriculture, and processes related to human activities became the main factor shaping the environment, influencing the course of geological processes, and changing the taxonomical and ecological structure of the fauna and flora assemblages found in this area.Item type:Article, Access status: Open Access , Molluscan assemblages in sediments of a landslide on Majerz Hill near Niedzica (Inner Carpathians, Southern Poland) – phases of development and environmental changes(Wydawnictwa AGH, 2022) Alexandrowicz, Witold PawełA detailed malacological analysis was made of sediments associated with a small landslide which had developed on the north-eastern slope of Majerz Hill near Niedzica (Inner Carpathians, Southern Poland). The age of the development and environmental changes associated with particular phases of the landslide was determined by means of radiocarbon dating. The analyses made it possible to distinguish two periods of landslide activation falling on the turn of the Early/Middle Holocene and on the Late Holocene (probably on the Iron Age Cold Period). These phases are closely related to periods of increased mass movements, both of landslides and debris flows in other European mountains, stages of glacial advance in the Alps, periods of increased fluvial activity in rivers and elevated water levels in European lakes. The molluscan assemblages also enabled the reconstruction of environmental conditions before the landslide formation, during periods of dormancy, and after the end of its activity.Item type:Article, Access status: Open Access , Malakofauna i fazy rozwoju osuwiska w Tylce kolo Krościenka (Pieniny)(Wydawnictwa AGH, 2009) Alexandrowicz, Witold PawełThe landslide is ranking on western slope of the White Stream valley. Two colluvial barrier and accompanied them dammed-lakes have been formed. Deposits filling these lakes contains rich molluscan communities. Additionally the occurrence of plant remains allowed to dating deposits using radiocarbon method. These data make possible to reconstruction of the history of this landslide during Late Holocene.Item type:Article, Access status: Open Access , Molluscan assemblages in Late Holocene deposits in Busko-Zdrój (Nida Basin, Southern Poland)(Wydawnictwa AGH, 2013) Alexandrowicz, Witold Paweł; Gołas-Siarzewska, MagdalenaLate Holocene deposits containing abundant and well-preserved malacofauna were exposed within the Spa Park in Busko-Zdrój. Molluscan shells were found in sand, dark muds and calcareous muds. Dark and calcareous muds are intercalated by fine-grained sand and peat devoid of malacofauna. Ali these deposits were accumulated on swampy, flat bottom of wide river valley. The result of radiocarbon dating has shown that the formation of the deposits started in the upper part of the Subboreal Phase. Numerous Late Medieval portery shards were found in several topmost profile sections. The identified malacofauna suggests that similar climatic and habitat conditions prevailed throughout the entire sedimentation period. Snails typical of open habitats, accompanied by hygrophilous taxa, play a dominant role. Mesophilous and aquatic taxa occur in accessory proportions, while shadow-loving forms are virtually absent.Item type:Article, Access status: Open Access , Malakofauna późnoglacjalnych i holoceńskich węglanowych osadów jeziornych północnej Polski(Wydawnictwa AGH, 2007) Alexandrowicz, Witold PawełLate Glacial and Holocene mollusc-bearing deposits developed as lacustrine chalk and/or calcareous gyttja are widespread in Northern Poland. They fill up water bodies formed during the final stage of deglaciation. These sediments usually contains rich assemblages of molluscs. Calcareous lake deposits and it's malacofauna were described in detail by several authors in 54 localities. Eighteen communities of snails and bivalves have been distinguished. They are represents three types of environment: land, temporary water bodies and permanent water bodies (lakes). The composition and structure of malacocenoses reflect changes of the climate and differentiation of habitats. Three types of malacological sequences can be define. The scheme of evolution water bodies during the Late Glacial and Holocene in Northern Poland was elaborated based on successions of molluscan communities.