. Fig. nnnilxi ol bald eagles (ounled [)er inventory at census areas within the L pper Illinois River Region. Central Illinois River lief^on. The Central Illinois River Region consists |)rimarily of the Peoria Naviga- tion Pool and extends from near .Spring Valley to Lower Peoria Lake (Fig. 6). This region was inven- toried approximately 125 times between 1972 aii<l 1986. Flights were made during Si-|)iembfi ihroiigh December from 1972 to 1985, during |anuarv from 1973 to I98(), and during February thiough April from 1980 to 1985. Fig. ' number ol the La (
. Fig. nnnilxi ol bald eagles (ounled [)er inventory at census areas within the L pper Illinois River Region. Central Illinois River lief^on. The Central Illinois River Region consists |)rimarily of the Peoria Naviga- tion Pool and extends from near .Spring Valley to Lower Peoria Lake (Fig. 6). This region was inven- toried approximately 125 times between 1972 aii<l 1986. Flights were made during Si-|)iembfi ihroiigh December from 1972 to 1985, during |anuarv from 1973 to I98(), and during February thiough April from 1980 to 1985. Fig. ' number ol the La (iiange Pool of (he Illinois River and stretches lioin Pekin to Naples (Fig. ). I his region has been more t loselv monitored for eagles than anv other with over inventories liom 1972 to 1980. (^c'lisus lliglils \kv\v made fluiing Seplembei lliiough Deteiiibei from 1972 to 1985. during |.iiiuai V lioiii 197!^ Io 198(1. .tnd tlui ing Februarv through .\piil from 1980 to 19M5. Seasonal variation in eagle use ol this region is sliiivMi in Figure 23. No i ensus flights were tonclui led I loin t IV to Icbi I imesof i iv-
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookcontributoruniv
