50 



UNIVERSITY OF WISCONSIN STUDIES 



TABLE XII 



COMPARISON OF FOODS EATEN BY THE FISHES IN GREEN LAKE (1919), LAKE 

 MENDOTA (1919), LAKE PEPIN (1920), LAKE MICHIGAN (1920), 

 LAKE GENEVA (1920). 



The classes of foods grouped under the lake where they were 

 found in largest amount are as follows: 



Pepin birds, crayfishes, cladocerans, copepods, rotifers, sponges, proto- 

 zoans, bottom sediment. 



Mendota adult insects, ostracods, snails, leeches, plants, algae. 



Green Lake amphipods, clams, oligochaetes. 



Lake Geneva fishes, immature insects, mites. 



Lake Michigan Mysis, isopods, calcium carbonate crystals. 



Some foods were eaten in greater quantity in lakes that were 

 most like rivers: birds, cladocerans, copepods, rotifers, sponges, 

 protozoans, bottom sediment. Other foods were found less often 

 where conditions were like rivers and increased where typical 

 lacustrine conditions prevailed: fishes, Mysis, amphipods, 

 isopods, oligochaetes, calcium carbonate crystals. Some foods 

 eaten in about the same amount in all types of lakes: immature 



