Preliminary Investigation of the Algal Flora in the Sediments of Lake Erie

The algae in a 45-cm-long sediment core taken in the eastern basin of Lake Erie were examined to determine the extent and applicability of that flora in reflecting the history of the lake. Asterionella formosa, Melosira islandica, M. italica, Stephanodiscus niagarae, and Tabellaria fenestrata were the most abundant diatoms encountered. Quantitative diatom profiles reported as cells/cm³ sediment and relative abundance profiles each provide a contrasting history of post-settlement Lake Erie. In light of the known history of the lake, the relative frequency profiles appear to be most applicable. The C/P index of trophic status and diatom diversity support those profiles. The occurrence of non-diatom algae in the sediments was inadequate for detailed analyses; however, occurrence did correspond to the trophic history determined by the diatoms. Botryococcus braunii, Cosmarium formosulum, Pediastrum boryanum, and Staurastrum gracile were most commonly encountered.