24 ILLINOIS BIOLOGICAL MONOGRAPHS [24 



Depositing sandy-shores: Another habitat scanty in vegetation, this 

 time because of the constant deposition of sand and shore material by the 

 water. The bottom is much less rugged, and shows affinities to the sand 

 and gravel-bottom stream communities. (Fig. 4.) 



Vegetation covered areas: These are characteristically of two kinds: 

 1) the submerged vegetation of the mediumly deep water; and 2) the 

 emerging vegetation, characteristically in shallow water. The submerged 

 vegetation reaches its maximum depth at the edge of the sand bars in 

 water of from fifteen to thirty-five feet in depth, depending on the specific 

 character of the lake. Here great beds of Potamogeton, Nymphaea and 

 Vallisneria afford the normal habitat of the basses, pickerel, dogfish, adult 

 sunfishes, silverbasses and other species. The zone of emerging vegetation, 

 largely rushes, arrow-head and lilies, offers protection to hosts of minnows 

 and the young of many of the larger game fishes. 



