Table 7. — Niunber of insects and other organisms per square foot (0.092 m.^ ) collected In Gongeau 

 Creek (sand and detritus area) and Buck Bay Creek (riffle area) before chemical treatment and 1 

 week and 6 weeks after treatment. Lake Superior, 1964 



Organism 



Gongeau Creek 



Pretreatment 1 week 6 weeks 



Buck Bay Creek 



Pretreatment 1 week 



Insects: 

 Plecoptera 



Pteronareldae. . . . 



Nemouridae 



Perlidae 



Perlodldae 



Chloroperlidae. . . 

 Epheneroptera 



Ephemerellidae. . . 



Heptagenlidae. . . . 



Leptophlebiidae. . 



Baetidae 



Odonata 



Cordulegasteridae 

 Hemlptera 



Hebridae 



Megaloptera 



Sialidae 



Trichoptera 



Rhyacophllidae. . . 



Psychomylldae. . . . 



Hydropsychldae. . . 



Hydroptilidae. . . . 



Phryganeldae 



LLmnephilldae. . . . 



Molannidae 



Lepidostomatidae . 



Brachycentridae. . 

 Coleoptera 



Elmldae 



Diptera 



Tlpulidae 



Slmullldae 



Chironomidae 



Heleldae 



Rhaglonidae 



Empldidae 



Other 



Other invertebrates: 



Nematoda 



Annelida 



Crustacea 



Hydracarina 



Mollusca 



Total 



Percentage of 

 pretreatment 

 number 



2 

 20 



1 

 



4 

 2 

 3 



70 











11 

 

 2 

 2 

 6 

 

 1 

 

 



6 



1 

 45 

 16 





 11 











1 





 

 5 



3 



1 



1 



41 



1 





 18 

 1 

 

 3 

 1 



Number per square foot 



10 







45 



47 

 8 

 2 



38 



14 

 1 



47 

 7 

 1 

 3 

 





 

 



1 



21 



2 







2 



60 



13 





 

 



1 



4 







11 







4 

 



63 

 1 

 



13 

 







1 









 14 



1 

 



1 



22 



3 



76 

 4 

 



23 

 







13 

 

 5 



1 







11 











108 



15 

 

 1 



24 



3 

 7 



45 

 3 

 



24 

 



224 



268 



100 



40 



120 



100 



93 



10 



