344 



Illinois N.atlr-al History Survey Bulletin 



Vol. 28. An. 2 



habitat succession and in degree of hu- ty streams in which they were present. 



man-induced modification, most fish spe- However, some support for the Thomp- 



cies showing definite patterns of distribu- son \ Hunt concept e.xpressed above was 



tion based on stream size did not e.xhibit found. The following species showed 



these patterns in all the Champaign Coun- somewhat consistent distribution patterns 



Table 19.— Other minnows and the carp. Average numbers of each of several species taken 

 in the 1959 sur\ev quantitative samples only in streams of various size ranges. Each species 

 average is for only tho-e stream s\ stems in which the <;pecie^ occurred in the quantitative col- 

 lections. 



Species 



Draixace .\rea of Stream ix Square Miles at 

 Point of CoLLEcnox 



-8- 



-16- 



-64- 



-128- 



-25< 



-512 



Sem»tUus atromaculatus 



Phrmacoblus mirabilis 



Ericymba bmccata - 



Hjbopsis biguttala* .. 

 K»temiponus crjsolrucas 

 Cjprimus carpio — __ 



4.3 

 0.4 

 1.5 

 0.7 

 1.3 

 1.0 



8.1 

 0.1 

 0.4 

 1.4 



0.5 

 0.3 



•AU 



except Embjnas*. 



Table 20. — Catfishes. .Average numbers of each of several species taken in the 1959 survey 

 'quantitative samples only in streams of various size ranges. Each species average is for only 

 those stream systems in which the species occurred in the quantitative collections. 



Species 



Drainage .Area of Stream iv Square Miles .at 

 Point of Collection 



-16- 



-64- 



-128- 



-256 512 



Ictalurus natalis 



Soturus gjrinus* 

 Koturus fia^usf 

 Soturus miuruft 

 Ictalurus punctatus^ 

 FyloJictus olivaris% 



4.3 



0.4 

 0.1 



0.9 

 0.3 

 0.1 



0.5 

 tr. 

 0.1 



0.1 



0.2 

 02 

 0.1 



0.1 

 tr. 

 0.6 

 1.2 

 0.3 

 0.1 



0.1 

 0.1 

 0.2 



0.3 



*Salt Fork. SangamoD. 3Dd Kaskaskia onlj. 

 tSalt Fork, Middle Fork, and Sangamoo oolv. 



IMiddle Fo:k and Elmbarra^ only. 

 §Middle Fork 011I7. 



Table 21. — Sunfish and bass. .Average numbers of each of several species taken in the 1959 

 survey quantitative samples only in streams of various <iize ranges. Each species average is 

 for only those stream systems in which the species occurred in the quantitative collections. 



Species 



Drainage .\rea of Stream in Square Miles at 

 Point of Collection 



4- 



16- 



-32- 



-64- 



-12^- 



-Jit 



-512 



Lfpomis megalotis 



Microptfrus Jolomieui* 

 Microptrrus punctulatus^ 



Lepomis macrochirus%. 



Lepomis cjanellus ^ 



Ambloplites rupestris* 

 Micropterus salmoides^ 

 Pomoxis annularis* 

 Lepomis humilis^ 



0.2 

 0.2 



tr. 

 1.3 

 0.3 

 0.2 

 tr. 



*Sali Fork, Middle Fork, and Sangamon duy. 

 tMidtOe Fork only. 



tSalt Fork. Kaskaskia. and Sangamon only. 

 §Salt Fork and Sangamon only. 



