EAST TAWAS • 



•GODERICH 



4-8 June 1974 



• PORT HURON 



Figure 1 Outline map of the southern Lake Huron showing the distribution 



of the eutrophication tolerant diatom FragilaHa ca£U£ina Desm. in the 



waters of Lake Huron outside Saginaw Bay in early June 1974. 



176 



