COMPARISON OF SPEt'IKS LISTS; MIDDLE PEORIA LAKE 



Whmc WATiuia 



1 ; . I osasGCtions 1920: 8 stations; 2 cross-sections 



I'OM.ITIONAL, MOKK TOIJatAST, OR DOUBTFUL 



lVor»is {TubificUItie and Naididae) 



Limnodrilus hoffmeisteri Claparfide 



Limnortrilus n. sp. 



Tubifcx tubifex (Miiller)? or var. 



Naididae. unidentified 



Other uuidentitled, immature 



4 + 



At least 3 or 4 spp., unidentified 



3+ 



Helobdella nepheloidea (Graf) 

 Helobdella stagnalis (Linnaeus) 



Leeches 



Unidentified species 



PoUutional or more tolerant midpe larvae 



Chironomus plumosus Linnaeus, var. 



Chironomus plumosus Linnaeus 

 Chironomus plumosus Linnaeus, var. 

 Tanypus dyari Coquillett 

 3 



Midge larvae of douitful status 



Chironomus sp. near C. maturus 



Johannsen 

 Chironomus digitacus Malloch 

 Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp, or spp. 

 5+ 



Chironomus sp. or spp. 

 Tanypus sp. or spp. 



2+ 



Unusually tolerant snails 

 Musculium transversum Say Musculium transcersum Say 



1 I 1 



LESS TOLERANT GEOITP (SNAILS ONLY) 



Less tolerant snails, first group, (upper lake, farthest northward 

 occurrence, 1922) 



Campeloma subsolidum Anthony 



Musculium truncatum Linsley 



nsiiirum e<-/rapT"<???inrrTTTTTT^ 



Pisidium pauperculum, var. crj'stal- 



ense Sterkl 

 Pisidium sp. near P. complanatum 



Sterki 

 Campeloma subsolidum Anthony 

 5 



Less tolerant snails, second group, (middle lake, farthest north- 

 ward occurrence, 1022) 

 Pisidium pauperculum Sterki 

 Pisidium sp. like P. sp. from L. 



Winnebago, Sterki 

 Pisidium sp. unidentified. Sterki 

 Sphaerium stamineum Conrad 

 Sphaerium striatinum, var. lilycash- 



ense Baker 

 5 



MusieU 

 



HnaiU 

 



Bryozoa 

 



Sponges 







Crustacea 

 



CLEANER WATER OR LESS TOLERANT ASSOCIATED GROUP 



Mussels 







Snails 

 



Bryozoa 

 



Sponges 

 



Crustacea 

 



Other insects than midges 

 



Total 23+ 



Other insects than midges 

 



Total 11+ 



1922: 27 stations; 3 cross-sections 



1920: 6 stations; 2 croBS-sections 



POLLUTIONAL, MORE TOLERANT, OR DOURTFTJL 



Worms (Tuhiflcidae and Naididae) 



Limnodrilus hoffmeisteri ClaparSde 

 Limnodrilus n. sp. 

 Naididae. unidentified 

 Other unidentified, immature 

 3+ 



At least 3 unidentified spp. 



Helobdella nepheloidea (Graf) 

 Helobdella stagnalis (Linnaeus) 



Leeches 



Unidentified species 



PoUutional or more tolerant midge larvae 



Chironomus plumosus Linnaeus, var. 



Midge larvae of 

 Chironomus sp. near C. maturus 



Johannsen 

 Chironomus digitatus Malloch 

 Chironomus sp. or spp. 

 Procladius sp. or spp. 

 Tanypus sp. or spp. 

 5+ 



Chironomus plumosus Linnaeus 

 Chironomus plumosus Linnaeus, var. 

 Tanypus dyari Coquillett 

 3 



doubtful status 

 Chironomus sp. or spp. 

 Tanypus sp. or spp. 



2 + 



Unusually tolerant snails 

 Musculium transversum Say I Musculium transversum Say 



1 I 1 



LESS TOLERANT GROUP ( SNAILS ONLY) 



Less tolerant snails, first group, (upper lake, farthest northtvard 

 occurrence, 1022) 

 Musculium truncatum Linsley Campeloma subsolidum Anthony 



Pisidium compressum Prime 



FibHliuin ijauporculum, var ory^rtnl- 



ense Sterki 

 Pisidium sp. near P. complanatum 



Starki 

 Campeloma subsolidum Anthony 

 5 



Less tolerant snails, second group, (middle lake, farthest north- 

 ivard occun-ence, 1022) 

 Pisidium pauperculum Sterki 

 Pisidium sp. unidentified, Sterki 

 Sphaerium stamineum Conrad 

 Sphaerium striatinum, var. lilycash- 



ense Baker 

 4 



Mussels 

 



Snails 

 



Bryozoa 

 



Sponges 

 



Crustacea 

 



LESS TOLEItANT ASSOCIATED GROUP 



Mussels 



Snails 

 



Other insects than midges 

 



Total 21+ 



Bryozoa 

 



Sponges 

 



Crustacea 

 



Other insects tha7i midges 

 



Total 11+ 



1922: 3 stations; 3 cross-sectlonB 



1920: 2 stations; 2 cross-sections 



POIXUTIONAI,, MORR TOLERANT, OR DOUBTTUL 



Worms (Tubificidae and Naididae) 



Limnodrilus hoffmeisteri Claparfede 



Limnodrilus n. sp. 



Tubifex tubifex (Miiller) or var.? 



Naididae. unidentified 



4 



At lea«t 3 unidentified spp. 



Leeches 

 



3 



Leeches 



I Leeches 



PoUutional or more tolerant midge larvae 

 Chironomus plumosus Linnaeus, var. | Tanypus dyari Coquillett 

 1 1 1 



Midge larvae of doubtful status 



Chironomus sp. or spp. 

 1 



Chironomus sp. or spp. 

 1 



Unusually tolerant snails 



Musculium transversum Say i 



1 



LESS I-OLERANT GROUP (SNAILS ONLV) 



Less tolerant snails, first group, (upper lake, farthest northward 

 occurrence, 1022) 

 Pisidium compressum Prime 

 Pisidium sp. near P. complanatum 

 Sterki 



Less tolerant snails, sec07id group, (middle lake, farthest nortJi- 

 ■ward occurrence, 1022) 

 Pisidium sp. like P. sp. from L. Win- 

 nebago, Sterki 

 Sphaerium striatinum. var. lilycash- 



CLEANEa WATER Oil LESS TOLEILiST ASSOCIATED GROUP 



