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Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois distributionabun129have Year: 1988 Fig 7 - 1 vpual iivcniie habitat of the L'ppcr Mississi] gion. The seasonal pattern of eagle use of the Upper Mississippi River Region is shown in Figure 8. Annual peak population counts occurred between 2 February and 23 March. Substantial numbers of birds were still present when counts were terminated each spring. The greatest 1-day count was 213 eagles on 23 March 1983. Southern (1964) observed peak numbers of 268 and 225 eagles in this region

Distribution and abundance of winter Distribution and abundance of winter populations of bald eagles in Illinois  distributionabun129have Year: 1988  Fig 7 - 1 vpual iivcniie habitat of the L'ppcr Mississi] gion. The seasonal pattern of eagle use of the Upper Mississippi River Region is shown in Figure 8. Annual peak population counts occurred between 2 February and 23 March. Substantial numbers of birds were still present when counts were terminated each spring. The greatest 1-day count was 213 eagles on 23 March 1983. Southern (1964) observed peak numbers of 268 and 225 eagles in this region Stock Photo
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Contributor:

Bookend / Alamy Stock Photo

Image ID:

T1H3AY

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5.7 MB (66.3 KB Compressed download)

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1394 x 1435 px | 23.6 x 24.3 cm | 9.3 x 9.6 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 7 - 1 vpual iivcniie habitat of the L'ppcr Mississi] gion. The seasonal pattern of eagle use of the Upper Mississippi River Region is shown in Figure 8. Annual peak population counts occurred between 2 February and 23 March. Substantial numbers of birds were still present when counts were terminated each spring. The greatest 1-day count was 213 eagles on 23 March 1983. Southern (1964) observed peak numbers of 268 and 225 eagles in this region on 2 February 1962 and on 5 February 1963, respectively. A total of 2,663 eagle sightings was recorded in this region; 34.99? of those were immatures. The proportion of immature ISO â 140- 130 - 70 â 60 â 50- iO â IMMATURES TOTAL birds ranged from 30.9 to 41.69c on individual census flights. The mean count per inventory on individual cen- sus areas is shown in Figure 9. The area between the Wapsipinicon River and Princeton was the most heav- ily used in this region, with an average of 20.9 eagles sighted per inventory (Appendix). Other heavily used areas were the Bellevue to Green Island segment and the Fulton to Albany area. The Upper Mississippi River Region also includes the Oak Valley F.agle Ref- uge in Rock Island Clounty. The heavy use of this area by wintering bald eagles was documented by Klton Fawks through 25 years of observation and because of its importance, the refuge was purchased by the Illinois Department of Conservation (IDOC) in 1980. For the Upper Mississippi River Region as a whole, bald eagles occurred at an average density of 1.38 eagles per river mile or 0.96 eagle per square mile of wetland habitat from 1980-1983. These values are higher than those for any other region of the Missis- sippi and Illinois rivers; however, the Upper Missis- sippi River Region has been flown for fewer years than the other regions (Table 4, Fig. 6). Upper Central Missi

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