SHALLOW WATER COMMUNITIES 



79 



depth to 4 meters (13 ft.) Sphaerium vermontanum, which occurs rarely 

 in Hickory Creek also, and midge larvae (a red and a white species) 

 appear characteristic. A number of species of small fish such as the 

 blunt-nosed minnow, the straw-colored minnow, and shiners are likely 

 to be found in from 4-8 meters (13-26 ft.) of water. An occasional 

 Lymnaea woodruffi is found at this depth. 



Representative Fishes Belonging Mainly to the Transition Belt of 

 Lake Michigan (25-54 m.) 



Fig. 20. — Great Lakes trout {Cristiwmer namaycush); length 3 feet (after Jordan 

 and Evermann). 



Fig. 21. — The long- jaw whitefish (Argyrosomus prognathiis); length 15 inches; 

 from the depth of 74 meters (after Smith). 



c) Communities of protected situations (Table X). — Near Chicago, 

 bays and inlets are rare. Doubtless the mouths of some of the larger 

 rivers, before they were modified for navigation, were of this character. 

 Such places have been studied in Lake Superior (80, 83) and the Grand 

 Traverse Bay region. Out of 21 species recorded here, 16 are definitely 



