March, 1963 Larimore & Smith: Fishes of Champaign County 



327 



Etheostoyna zonale zonale (Cope). 

 Eastern banded darter. — TH 8 (Sanga- 

 mon), LS 6 (Sangamon). 



Percina caprodes caprodes (Rafinesque) 

 X semifasciata (De Kay). Logperch. — 

 The meager material available regarded 

 as representing an intergrade population. 

 Middle Fork specimens show greater re- 

 semblance to Percina caprodes semifasciata 

 and Kaskaskia specimens to P. c. caprodes ; 

 Sangamon specimens are almost exactly 

 intermediate. FR 2 (Salt Fork, Sanga- 

 mon), TH 2 (Kaskaskia, Middle Fork), 

 LS 10 (all drainages except the Salt 

 Fork). 



Percina maculata (Girard). Blackside 

 darter. — Reported as Hadropterus aspro 

 by Forbes & Richardson, Thompson & 

 Hunt, and other earlv authors. FR 15 

 (Salt Fork, Sangamon), TH 24 (all 

 drainages except Little Vermilion), LS 

 49 (all drainages except Little Ver- 

 milion). 



Percina phoxocephala (Nelson). Slen- 

 derhead darter. — Reported as Hadrop- 

 terus phoxocephalus by Forbes & Rich- 

 ardson, Thompson & Hunt, and other 

 early authors. FR 3 (Salt Fork, Sanga- 

 mon), TH 8 (Salt Fork, Middle Fork, 

 Sangamon), LS 18 (Salt Fork, Middle 

 Fork, Sangamon). 



Percina sciera sciera (Swain). North- 

 ern dusky darter. — A specimen recently 

 taken in the minnow seine near Penfield, 

 the first record for the county. LS 1 

 (Middle Fork). 



Sciaenidae 



A plodinotiis grunniens Rafinesque. 

 Freshwater drum. — TH 3 (Sangamon), 

 LS 4 (Sangamon) . 



ANALYSIS OF DISTRIBUTION 

 PATTERNS 



Of the 90 species of fishes in our an- 

 notated list for Champaign County, 7 

 {Amia calva, Carassius auratus, Ictalurus 

 nebulosus, Gambusia affinis, Roccus mis- 

 sissippiensiSj Lepomis punctatus, and Le- 

 pomis microlophus) are introductions and 

 must be excluded from any distributional 

 analysis of native species. 



Of the remaining 83 species, 13 reach 

 the edges of their natural ranges within, 

 or very near. Champaign County. They 

 can be classified as northern, southern, 



western, and eastern components on the 

 basis of the direction in which their main 

 ranges are located in relation to the coun- 

 ty. Notropis rubellus and Etheostoma 

 zonale are northern species that, in Illi- 

 nois, reach their southernmost point of 

 distribution within the county. Notropis 

 heterolepis also is a northern species that 

 once extended southward somewhat be- 

 low Champaign County, but whose range 

 has since retreated to the north. Noturus 

 nocturnus, Micropterus punctulatus, and 

 Etheostoma gracile are southern species 

 that, in Illinois, have their northernmost 

 records of occurrence within the county. 

 Notropis dorsalis, Notropis lutrensis, and 

 Noturus exilis are western species that, in 

 Illinois, reach their easternmost limit of 

 distribution in the county. Noturus miu- 

 rus, Etheostoma blennioides, and Hybopsis 

 amblops are eastern species that, at least 

 at this latitude, reach their westernmost 

 limit of distribution in the county. Eri- 

 cymba buccata, another eastern species, 

 occurs throughout Champaign County but 

 does not occur, in central Illinois, much 

 to the west of our area. Peripheral popu- 

 lations are of considerable interest in that 

 they can, when studied over a period of 

 time, provide evidence of range expansion 

 and withdrawal. The 13 species just men- 

 tioned above have been carefully studied 

 for such trends, and the data that they 

 provide are discussed under Changes in 

 Distribution. 



The other 70 species of fishes in our 

 Champaign County list have more exten- 

 sive ranges and occur throughout this part 

 of the state. These 70 species, needless 

 to say, do not occur everywhere in the 

 county. In fact, only 19 species are known 

 to occur in all six drainages within the 

 county. These species are as follows: 



Esox americanus 



Catostomus commersoni 



Erimyzon oblongus 



Cyprinus carpio 



Ericymba buccata 



N otemigonus crysoleucas 



Notropis spihpterus 



Notropis stramineus 



Notropis umbratilis 



Pimephales notatus 



Semotilus atromaculatus 



Ictalurus melas 



Ictalurus natalis 



