. Bulletin. Natural history; Natural history. 64 Illinois Natural History Survey Bulletin Vol. 27, Art. 1 CO X o o z _J -J \- RANGE OF ACTUAL LENGTHS AVERAGE OF CALCULATED LENGTHS AT FIRST ANNULUS AVERAGE OF ACTUAL LENGTHS. ^ 1948 YEAR CLASS 1949 YEAR CLASS X J. SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT 1948 1949 Fig. 24.—Averages of actual total lengths and averages of calculated total lengths at time of formation of first annulus for warmouths of the 1948 year class taken in 10 collections from Venard Lake, early October, 1948, through middle October, 1
. Bulletin. Natural history; Natural history. 64 Illinois Natural History Survey Bulletin Vol. 27, Art. 1 CO X o o z _J -J \- RANGE OF ACTUAL LENGTHS AVERAGE OF CALCULATED LENGTHS AT FIRST ANNULUS AVERAGE OF ACTUAL LENGTHS. ^ 1948 YEAR CLASS 1949 YEAR CLASS X J. SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT 1948 1949 Fig. 24.—Averages of actual total lengths and averages of calculated total lengths at time of formation of first annulus for warmouths of the 1948 year class taken in 10 collections from Venard Lake, early October, 1948, through middle October, 1949; averages of actual total lengths of warmouths of the 1949 year class taken in 4 collections, late June through late October, 1949; also range of actual total lengths in each collection. Lake Glendale, an 82-acre lake in Pope County, Illinois, warmouths showed a growth rate that was exceptionally fast for the species (Dr. Donald F. Hansen of the Illinois Natural Historj^ Survey, unpub- lished studies of Lake Glendale). Another example of improved growth rate in a new impoundment is given by Hall & Jenkins (1953:34) ; they found that, in Tenkiller Reservoir in Oklahoma, the growth rate of warmouths was rapid during the first year of impoundment. Jenkins (1953:79) found that in Grand Lake, Oklahoma, the growth rate of warmouths gradually de- clined during the years of impoundment. Data from several studies of warmouth growth in other states are summarized by Carlander (1950:191-2; 1953:370-1). An inspection of these data and those given in table 27 reveals a wide range of differ- ences in warmouth growth rates. PARASITISM No attempt will be made here to survey all published records concerning parasites of the warmouth. Reference should be be made, however, to several important studies involving autopsies of compara- tively large numbers of warmouths. Holl (1932:99-100) examined 90 warmouths from North Carolina and discovered an in-. Please note that these images are ext
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