. Bulletins of American paleontology. 168 D. J. Echols, L. G. Price, and M. A. Rafle. In this second stud}', we hoped not only to correct operational error and eliminate interpretive bias, but also to answer two other important questions, namely the relationship between faunal variety and the age of the lake, and the effect of man's induced environmental changes on the faunal composition. Text-figure 1 is a schematic map of St. Louis and vicinity which shows the approximate locations of the lakes from which collections were made. For the present study, four of the lakes sampled in 1962-63 were
. Bulletins of American paleontology. 168 D. J. Echols, L. G. Price, and M. A. Rafle. In this second stud}', we hoped not only to correct operational error and eliminate interpretive bias, but also to answer two other important questions, namely the relationship between faunal variety and the age of the lake, and the effect of man's induced environmental changes on the faunal composition. Text-figure 1 is a schematic map of St. Louis and vicinity which shows the approximate locations of the lakes from which collections were made. For the present study, four of the lakes sampled in 1962-63 were recollected during the winter, spring and summer months. Samples of 3 to 4 cubic centi- meters of material were collected by means of a conical 200 mesh plankton net at various stations and depths within each lake. When the collections were made in 1962-63 and again in 1971-72, the following conditions were noted: (1) the general appearance of the lake { size, water level, amount and distribution of aquatic vegetation), (2) temperature, (3) pH, and (4) bottom conditions. Table I summarizes the physical conditions recorded from the three lakes in which live standing crops of ostracodes were recovered and the relative seasonal abundances of the species identified. The fourth lake col- lected was Creve Coeur lake, a natural cut-off meander of Missouri River, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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