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Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois distributionabun129have Year: 1988 Fig. 21.-Mean number of bald eagles tountecl per inventory at cen.sus areas within the Central Illinois River Region, 1972-1986. Fig. 23.-Mean number of bald eagles counted per Lower Illinois River Region. 1972-1986. 0 to 50.09 of tlie total eagles observed, and the overall proportion of immatiires was 34.79 for all inven- tories. The mean number of eagles inventoried per cen- sus flight is illustrated in Figure 24. ,reas with the most use by ba

Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois  distributionabun129have Year: 1988  Fig. 21.-Mean number of bald eagles tountecl per inventory at cen.sus areas within the Central Illinois River Region, 1972-1986. Fig. 23.-Mean number of bald eagles counted per Lower Illinois River Region. 1972-1986. 0 to 50.09 of tlie total eagles observed, and the overall proportion of immatiires was 34.79 for all inven- tories. The mean number of eagles inventoried per cen- sus flight is illustrated in Figure 24. ,reas with the most use by ba Stock Photo
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Contributor:

Bookend / Alamy Stock Photo

Image ID:

T1H40J

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5.7 MB (152.3 KB Compressed download)

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1917 x 1043 px | 32.5 x 17.7 cm | 12.8 x 7 inches | 150dpi

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Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois distributionabun129have Year: 1988 Fig. 21.-Mean number of bald eagles tountecl per inventory at cen.sus areas within the Central Illinois River Region, 1972-1986. Fig. 23.-Mean number of bald eagles counted per Lower Illinois River Region. 1972-1986. 0 to 50.09 of tlie total eagles observed, and the overall proportion of immatiires was 34.79 for all inven- tories. The mean number of eagles inventoried per cen- sus flight is illustrated in Figure 24. ,reas with the most use by bald eagles intluded Chautauqua National Wildlife Refuge (Fig. 25), Crane Lake, Clear Lake, Cuba Island, and Jack Lake (Appendix). .11 of these areas are privately owned except the 4,500-acre (1,822-ha) Chautauqua Refuge. al in late September and early October and spring dejiaiture by eailv pv were similar to those in the Cential Illinois Rier Region. Eagles arried in the Lowei Illinois Rier Region approximately 1 week earlier than in the Cential Illinois River Region in 2 of the 15 years inventoried. Peak population counts have occurred from 2 De- cember until 18 March; the latter is also the date of the highest 1-day count of .345. The proportion of immatures seen on indixidual censuses ranged from

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