|
Table 1. Number of survey routes and surveys used in the analysis, with estimated trends in the eagles counted, midwinter, by state. Asterisks indicate trends significantly different from zero. (Download)
| State |
Routes |
Surveys |
Years |
% Annual Change |
95% CI |
|
|
| Alabama |
3 |
57 |
(1986-2005) |
0.2% |
(-2.9%, 3.2%) |
|
| Arizona |
65 |
721 |
(1992-2005) |
-1.3% |
(-2.6%,-0.1%) |
* |
| Arkansas |
20 |
163 |
(1986-2005) |
-0.4% |
(-2.4%, 1.6%) |
|
| California |
7 |
78 |
(1986-2005) |
1.2% |
(-1.4%, 3.9%) |
|
| Colorado |
34 |
444 |
(1986-2005) |
-2.3% |
(-3.7%,-1.0%) |
* |
| Connecticut |
10 |
136 |
(1986-2005) |
2.7% |
( 0.5%, 5.0%) |
* |
| Delaware |
1 |
13 |
(1989-2004) |
3.3% |
(-3.4%,10.5%) |
|
| Georgia |
9 |
61 |
(1989-2005) |
0.1% |
(-3.1%, 3.4%) |
|
| Idaho |
77 |
1176 |
(1986-2005) |
1.7% |
( 0.9%, 2.5%) |
* |
| Illinois |
43 |
317 |
(1988-2005) |
3.8% |
( 2.1%, 5.5%) |
* |
| Indiana |
25 |
346 |
(1986-2005) |
3.4% |
( 1.8%, 5.0%) |
* |
| Iowa |
48 |
505 |
(1986-2005) |
6.8% |
( 5.1%, 8.5%) |
* |
| Kansas |
15 |
210 |
(1986-2005) |
2.5% |
( 0.4%, 4.6%) |
* |
| Kentucky |
17 |
163 |
(1986-2005) |
1.1% |
(-1.1%, 3.3%) |
|
| Louisiana |
6 |
53 |
(1986-2004) |
-1.0% |
(-4.6%, 2.7%) |
|
| Maryland |
3 |
53 |
(1986-2005) |
4.9% |
( 1.7%, 8.1%) |
* |
| Massachusetts |
4 |
62 |
(1986-2005) |
2.5% |
(-1.1%, 6.3%) |
|
| Michigan |
3 |
31 |
(1987-1998) |
9.4% |
( 4.2%,15.0%) |
* |
| Minnesota |
4 |
65 |
(1986-2005) |
6.4% |
( 3.0%, 9.9%) |
* |
| Mississippi |
2 |
12 |
(1997-2005) |
0.4% |
(-6.4%, 7.8%) |
|
| Montana |
37 |
300 |
(1986-2005) |
1.4% |
(-0.3%, 3.2%) |
|
| Nebraska |
6 |
79 |
(1986-2005) |
1.8% |
(-1.3%, 5.1%) |
|
| Nevada |
10 |
72 |
(1992-2005) |
-1.6% |
(-4.6%, 1.5%) |
|
| New Hampshire |
6 |
63 |
(1991-2005) |
6.3% |
( 2.7%,10.2%) |
* |
| New Jersey |
21 |
285 |
(1988-2005) |
5.0% |
( 3.2%, 6.7%) |
* |
| New Mexico |
41 |
284 |
(1990-1996) |
-1.2% |
(-3.2%, 0.9%) |
|
| New York |
2 |
40 |
(1986-2005) |
8.2% |
( 4.3%,12.1%) |
* |
| North Carolina |
4 |
33 |
(1987-2005) |
0.3% |
(-3.9%, 4.8%) |
|
| North Dakota |
1 |
20 |
(1986-2005) |
0.4% |
(-4.5%, 5.6%) |
|
| Ohio |
1 |
10 |
(1996-2005) |
10.1% |
( 0.4%,20.8%) |
* |
| Oklahoma |
33 |
384 |
(1986-2005) |
-0.5% |
(-1.8%, 0.9%) |
|
| Oregon |
84 |
1234 |
(1988-2005) |
1.7% |
( 0.8%, 2.6%) |
* |
| Pennsylvania |
8 |
77 |
(1986-2005) |
4.9% |
( 1.8%, 8.1%) |
* |
| South Carolina |
24 |
223 |
(1993-2005) |
1.1% |
(-0.9%, 3.1%) |
|
| South Dakota |
4 |
71 |
(1986-2005) |
-1.5% |
(-4.2%, 1.3%) |
|
| Tennessee |
8 |
122 |
(1986-2005) |
0.1% |
(-2.3%, 2.5%) |
|
| Texas |
20 |
254 |
(1986-2005) |
-0.2% |
(-1.9%, 1.5%) |
|
| Utah |
19 |
262 |
(1986-2005) |
-0.8% |
(-2.5%, 1.0%) |
|
| Vermont |
3 |
39 |
(1989-2005) |
8.8% |
( 4.3%,13.5%) |
* |
| Virginia |
4 |
27 |
(1997-2005) |
2.7% |
(-2.4%, 8.0%) |
|
| Washington |
5 |
60 |
(1986-2005) |
3.3% |
(-0.5%, 7.2%) |
|
| West Virginia |
1 |
8 |
(1995-2004) |
-0.6% |
(-9.4%, 9.0%) |
|
| Wisconsin |
8 |
61 |
(1991-2005) |
4.7% |
( 1.2%, 8.2%) |
* |
|
|
Table 2. Estimates of percent annual change in midwinter Bald Eagle counts by ecoregion, 1986-2005 (n = 746). Asterisks indicate trends significantly different from zero. (Download)
| Ecoregion |
% Annual Change |
95% CI |
|
|
| East Coasta |
2.5% |
( 1.4%, 3.6%) |
* |
| Eastern Woodlandb |
1.7% |
( 0.7%, 2.6%) |
* |
| Great Basinc |
0.9% |
( 0.1%, 1.7%) |
* |
| Great Lakesd |
6.8% |
( 4.8%, 8.7%) |
* |
| Gulfe |
-0.1% |
(-1.3%, 1.1%) |
|
| Pac Coastf |
2.3% |
( 1.2%, 3.5%) |
* |
| Prairieg |
3.2% |
( 2.3%, 4.1%) |
* |
| Rockiesh |
-0.1% |
(-0.9%, 0.8%) |
|
| SW Deserti |
-1.1% |
(-2.4%, 0.2%) |
|
|
a Southeastern Coastal Plan (27) and New England/Mid-Atlantic Coast (30)
b Atlantic Northern Forest (14), Central Hardwoods (24), Appalachian Mountains (28), and Piedmont (29)
c Great Basin (9) and Sierra Nevada (15)
d Boreal Hardwood Transition (12), Lower Great Lakes (13), and Prairie Hardwood Transition (23)
e Oaks and Prairies (21), West Gulf Coastal Plain (25), Mississippi Alluvial Valley (26), and Gulf Coastal Prairie (37)
f Northern Pacific Rainforest (5) and Coastal California (32)
g Prairie Potholes (11), Badlands and Prairie (17), Shortgrass Prairie (18)
h Northern Rockies (10) and Southern Rockies (16)
i Sonora and Mohave Deserts (33), Sierra Madre Occidental (34), and Chihuahua Desert (35)
|
|
Table 3. Estimates of trends in the Midwinter Bald Eagle count and proportion of survey routes with increasing trends, by region, 1986-2005. Asterisks indicate trends significantly different from zero. Regions are defined in relation to 40 degrees N and 100 degrees W.(Download)
| Region |
No. Routes |
% Annual Change |
95% CI |
|
% of routes with increasing counts |
|
| Overall |
746 |
1.7% |
( 1.1%, 2.4%) |
* |
63% |
| North |
360 |
3.6% |
( 2.6%, 4.5%) |
* |
76% |
| South |
386 |
-0.1% |
(-1.0%, 0.8%) |
|
50% |
| East |
355 |
3.5% |
( 2.5%, 4.4%) |
* |
75% |
| West |
391 |
0.0% |
(-0.9%, 0.9%) |
|
52% |
| Northeast |
131 |
6.0% |
( 4.4%, 7.6%) |
* |
92% |
| Southeast |
224 |
1.0% |
(-0.1%, 2.1%) |
|
64% |
| Northwest |
229 |
1.2% |
( 0.2%, 2.3%) |
* |
67% |
| Southwest |
162 |
-1.2% |
(-2.6%, 0.3%) |
|
30% |
|
|
|
|
