. Bulletin. Natural history; Natural history. 38S Illinois Natural History Survi-y Hullhtin Vol. 28, Art. .^ published records of the Illinois Coopera- tive Crop Reporting Service (Evving 1^50), (3) the published wetlands survey of the U. S. Fish and Wildlife Service (Shaw c<;c Fredine \^5b), and (4) pub- lished records of the University of Illinois Agricultural Experiment Station (King 5: W^inters 1952). These sources were supplemented bv unpublished records of the 1006-1909 "and the 1956-1958 bird censuses. In discussing estimates of Illinois bird populations, we ha\e referred to nor
. Bulletin. Natural history; Natural history. 38S Illinois Natural History Survi-y Hullhtin Vol. 28, Art. .^ published records of the Illinois Coopera- tive Crop Reporting Service (Evving 1^50), (3) the published wetlands survey of the U. S. Fish and Wildlife Service (Shaw c<;c Fredine \^5b), and (4) pub- lished records of the University of Illinois Agricultural Experiment Station (King 5: W^inters 1952). These sources were supplemented bv unpublished records of the 1006-1909 "and the 1956-1958 bird censuses. In discussing estimates of Illinois bird populations, we ha\e referred to northern, central, and southern zones of the state, fig. 4. P'or convenience, we based these zones on agricultural districts defined by the Illinois Cooperative Crop Reporting Service (Ewing 1959, map). In this study, the treatment of two such similar species as the eastern and the western meadowlarks, as well as the black- capped and the Carolina chickadees, offers a problem. Because in most instances we could not make specific determinations in these groups, we have usually lumped the data for the two species under one head- ing, for example, meadowlark (species?) or chickadee (species?). The basic quantitative data for this stud\ are presented in two types of tables, the first with emphasis on statistics (ex- ample: table 4), intended only to give the reader some impression of the inherent variability in the population data pre- sented, and the second with emphasis on avifauna (example: table 5), intended to. 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
