Abstract
ABSTRACT We analyzed variations in taxonomic composition, abundance, and preservation of freshwater mollusks during the mid- to late Holocene in three shallow lakes of the southeastern Pampa plain. Mollusks were obtained from core samples (110–140 cm long) from the deepest part of the lakes, and sampled at 1 cm intervals. Six species were identified: Heleobia australis, Heleobia parchappii, Biomphalaria peregrina, Uncancylus concentricus, Succinea meridionalis, and Antillorbis nordestensis. Assemblages were dominated by H. parchappii, which displayed continuous and complete records in the three sections. With the exception of H. australis, fossil assemblages were represented by the same species that today inhabit Pampean lakes and preserved the same rank order of abundance as modern communities. A similar pattern of variation in mollusk assemblage composition was recognized in the three successions, which initiated prior to circa 6000 cal. year B.P, with assemblages composed of H. parchappii and S. meridi...
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