Abstract

Surficial sediment samples from Lake Erie were examined quantitatively from the presence of agglutinated rhizopods. Preliminary findings indicate that three major faunal assemblages can be defined, roughly corresponding with the three basins of Lake Erie. Assemblage I in the western basin transect in dominated by Difflugia tricuspis with relatively high numbers (>1,000/20 cm 3 ). The central basin transect assemblage II is dominated by Difflugia oblonga with lower total numbers (500/20 cm 3 ) and the eastern basin (assemblage III) by Difflugia urceolata with extreme low numbers (<100/20 cm 3 ). The surface assemblages can be correlated with the decrease in organic carbon, from west to east, through the three basins. From this preliminary work it appears that both modern and fossil agglutinated rhizopods can be an important tool in paleolimnological studies.--Modified journal abstract.

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