ORDINATION OF MACROINVERTEBRATE COMMUNITIES 



753 



TABLE 1 



MACROINVERTEBRATE TAXA COLLECTED IN GREAT MIAMI RIVER 

 SYSTEM (OHIO) STUDY, JUNE-SEPTEMBER 1976 



*gr., species complex group. 



total number of macroinvertebrates found on the samplers. Principal 

 taxonomic keys included Hilsenhoff (1975), insects; Lewis (1974), 

 Stenonema mayflies; Holsinger (1972), amphipods; Klemm (1972), 

 leeches; Mason (1973), chironomids, and Beck and Beck (1966), 

 chironomids. 



The key portion of this study involved the measuring of 

 relationships among communities at the various stations. I used a 

 similarity index to indicate the distance between communities as a 

 function of their ecological similarity (Mcintosh, 1973). This index is 

 a coefficient of community (CC) index variously attributed to 

 Sorenson (1948), Dice (1945), or Kulczynski (1927), and is of the 

 form: 



