a er ‘aN al Moe ctal ae r eee an 
ESI DSS TL Se ay 8 ee V2 Bits 3 2 i io PATH ION 
Siena INA eA 
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; Ee cue Oe aees RPG RS 
a Se SMa TRIN? al TM EL 
SA wa EES ONO ta 
3 6 Ta) i / Sp Reger 5. a CASEY, ; 
HYBOPSIS VET NOTROPIS = eer abe CARPIODES rae 
AMBLOPS NGS = EMILIAE LATA ‘s VELIFER AS : 
aw 
ry 4 
b A S - U 
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[ [ .) \< EAU 5 G 
poe d ee Was 
& = BES 
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6. NOTROPIS 
HYBOPSIS TEXANUS 
X-PUNCTATA 
Fig. 3-8—Some Species of fishes decimated because silt has destroyed many of their habitats. The bigeye chub, 
t collected in Illinois in 1961, may already be extirpated. Circles, before 1905: dots, after 1950. 
» in range of 13 native species. The populations of sunfish, spotted sunfish, and Iowa darter (Fig. 14) 
snose shiner, blackchin shiner, blacknose shiner have shrunk as a result of the drainage of the floodplain 
ig. 9), and banded killifish (Fig. 10) have been lakes and sloughs marginal to the large rivers. 
luced to a few glacial lakes in extreme northeastern Strictly lacustrine species such as the pugnose 
nois as a result of the widespread drainage of shiner, blackchin shiner, and banded _ killifish are 
ural lakes and marshes in the northern half of the especially affected, for when the lake is drained the 
'e. The ranges of the bowfin, central mudminnow populations of these fishes are eliminated and there 
ig. 11), lake chubsucker, brown bullhead (Fig. 12), is no opportunity for recruitment into newly created 
‘head topminnow (Fig. 13), pygmy sunfish, bantam impoundments. Semilacustrine species such as the 
9 
