Abstract
ABSTRACT Sedimentary diatoms from a 609 cm core indicated that Summit Lake, Akron, Ohio, originated as a shallow alkaline pool following late Pleistocene glaciation. The lake gradually developed a limnetic zone and became a peat bog. In recent years, the lake has become a slightly alkaline hypertrophic waterbody probably because of increased soil erosion and domestic sewage pollution. One hundred thirty (130) taxa (species and varieties) of diatoms were identified from the sediments of Summit Lake. Species most frequently encountered in the oldest sediments were Fragilaria brevistriata, F. construens, and F. pinnata. Those common in younger peat sediments were Achnanthes exigua, Cyclotella compta, Cymbella diluviana, Fragilaria brevistriata, F. construens, F. pinnata, Mastogloia smithii var. lacustris, and Tabellaria quadrisepta. The most abundant diatoms in recent sediments (since 1800 A.D.) were Asterionella formosa, Cocconeis placentula, Cyclotella meneghiniana, Fragilaria crotonensis, Melosira granula...
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