Abstract
Lacustrine sediments of the lakes Wigry and Bia3e Wigierskie (Wigry National Park), up to ca. 2.5 m thick, are developed as lacustrine chalk intercalated with sand, mud and locally overlayed by peat. They contain rich mollusc assemblages comprising taxa typical of lakes and other permanent water bodies. Shallow water and flowing water species are accessory components of the fauna; land snails are represented by single specimens. Dreissena polymorpha (Pallas) and Potamopyrgus antipodarum (Gray), found in upper parts of the profiles, indicate a recent age of the sediments. Lacustrine chalk and calcareous gyttia are typical deposits of the Late Glacial and Early Holocene; in the Upper Holocene they developed only in very few lake basins, and the studied lakes are exceptional. The lithological and malacological analysis of their deposits makes it possible to reconstruct sedimentary processes controlling the accumulation of lake-filling calcareous deposits that are widespeared in N Poland.
Highlights
Calcareous deposits, developed as lacustrine chalk and/or calcareous gyttia, are typical sediments filling lakes and other water bodies
The extant malacofauna of the lakes Wigry and Bia3e Wigierskie was discussed by several authors (POLIÑSKI 1917, 1922, LEWANDOWSKI 1992, KO£ODZIEJCZYK 1994, 1996, BRZEZIÑSKI 1999 and others)
Bivalves associated with moving water (Pisidium nitidum Jenyns) are accessory components of the described assemblage
Summary
Calcareous deposits, developed as lacustrine chalk and/or calcareous gyttia, are typical sediments filling lakes and other water bodies. In many localities they were recognised as deposits accumulated mainly during the Late Glacial and Early Holocene. Mollusc assemblages of such sediments were described by BRODNIEWICZ (1979), KRZYMIÑSKA (1987), ALEXANDROWICZ S. The extant malacofauna of the lakes Wigry and Bia3e Wigierskie was discussed by several authors (POLIÑSKI 1917, 1922, LEWANDOWSKI 1992, KO£ODZIEJCZYK 1994, 1996, BRZEZIÑSKI 1999 and others). The fauna contained in their bottom sediments, developed as lacustrine chalk abounding in snail and bivalve shells, has not been previously investigated
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