.^20 



Ii.i.iNois Natural History Slrvev Bulletin 



Vol. 28. Art. 2 



All of the Champaign County drainage 

 systems showed a decided trend toward a 

 decrease in depth and an increase in width, 

 table 5. All of them showed a decrease 

 in gravel and an increase in sand. All but 

 the Kaskaskia River showed an increase 

 in silt, which had covered the gravel or 

 sand present in 1928. In the Kaskaskia, 

 however, sand deposits had covered over 

 both the gravel and silt formerly re- 

 corded, fig. 8. A general decrease was 

 evident in the occurrence of aquatic veg- 

 etation ; an increase had occurred, except 

 along the Sangamon and Kaskaskia rivers, 

 in the amount of overhanging vegetation. 

 Only in the Kaskaskia was there a strik- 

 ing change in water velocity, an increase 

 caused by recent dredging and straighten- 

 ing of the river and perhaps by the in- 

 troduction of large volumes of well water 

 in its upper reaches. Except for the gen- 

 eral increase in width and the unusual 

 conditions cited for the Kaskaskia River, 

 the changes noted were precisely those 

 which could be expected in view of the 

 changes in land use and landscape appear- 

 ance outlined earlier. Study of the values 

 in table 5 for decrease, unchanged status, 

 and increase for each characteristic in each 

 drainage system reveals the degree of these 

 changes. 



ANNOTATED LIST OF FISHES 



Ninety species are included in our an- 

 notated list of the fishes of Champaign 

 County. One of these, Hybopsis aestivalis, 

 is questionable for reasons given subse- 

 quently. A few other species, not in the 

 annotated list, are known from streams 

 in adjacent counties and may eventually 

 be found in this county. These species of 

 hypothetical occurrence are Carpiodes 

 carpio carpio (Rafinesque), Moxostoma 

 carinatum (Cope). Stizostedion canadense 

 (Smith), all of which have been taken a 

 short distance downstream in the Salt 

 Fork of the Vermilion in adjacent Ver- 

 milion County, and Etheostniua camurum 

 (Cope), taken in the Middle Fork of the 

 Vermilion in \'ermilion County. A few 

 other species, reported by Champaign 

 County fishermen but not examined by us 

 or documented by specimens, have not 

 been included in our list. Of the 90 species 

 in the annotated list, 74 were taken dur- 

 ing 1959 or have been taken since. 



