Table 4.

Snail genera observed in each lake.

Snail	Lake
	Charlevoix	Elk	Glen	South Leelanau	North Leelanau	Lime	Long	Skegemog	Walloon
S. emgarinata	+	+	+	+	+	+	+	+	+
P. parkeri	+	+	+	+	+	+	+	+	+
Lymnaea sp.						+			+
Gyraulus sp.	+	+	+		+	+	+		+
Pleurocera sp.	+	+	+	+	+	+	+	+	+
Helisoma sp. (=Planorbella sp.)	+	+	+	+	+	+	+	+	+
Campeloma decisum.			+	+				+	+
Marstonia lustrica	+		+	+	+	+	+	+	+
Viviparus sp.							+