Browsing by Subject "gytia wapienna"

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Access status: Open Access ,
Malakofauna osadów jeziornych torfowiska Gajlik na Pojezierzu Sejneńskim (północno-wschodnia Polska)
(Wydawnictwa AGH, 2010) Alexandrowicz, Witold Paweł; Żurek, Sławomir
Malacological 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.
Access status: Open Access ,
Malakofauna późnoglacjalnych i holoceńskich węglanowych osadów jeziornych północnej Polski
(Wydawnictwa AGH, 2007) Alexandrowicz, Witold Paweł
Late 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.