Appendix A (Table A1). Annual diets (number of prey items and percentage of total) of Bald Eagles at Adak, Amchitka, Kiska, and Tanaga islands, Aleutian Archipelago, Alaska 1993–1994, 2000–2002.
Mammals: |
1993 |
1994 |
2000 |
2001 |
2002 |
Norway rats (Rattus norvegicus) |
13 (5.2) |
35 (10.2) |
18 (7.1) |
9 (3.5) |
14 (5.2) |
Sea otter pups (Enhydra lutris) |
32 (12.9) |
58 (17.0) |
8 (3.2) |
7 (2.7) |
3 (1.1) |
Subtotal |
45 (18.2) |
93 (27.2) |
26 (10.2) |
16 (6.2) |
17 (6.3) |
Fish: |
|||||
Pacific cod (Gadus macrocephalus) |
21 (8.5) |
44 (12.8) |
23 (9.1) |
16 (6.2) |
28 (10.4) |
Rock greenling (Hexagrammus lagocephalus) |
57 (22.9) |
22 (6.4) |
11 (4.3) |
24 (9.3) |
16 (6.0) |
Atka mackerel (Pleurogrammus monoptergius) |
2 (0.01) |
0 (0.0) |
3 (1.2) |
26 (10.0) |
11 (4.1) |
Smooth lumpsuckers (Aptocyclus ventricosus) |
45 (18.2) |
0 (0.0) |
1 (0.4) |
0 (0.0) |
6 (0.7) |
Sculpins (Cottus spp.) |
1 (0.01) |
0 (0.0) |
1 (0.04) |
0 (0.0) |
6 (0.03) |
Rockfishes (Sebastes spp.) |
1 (0.01) |
5 (0.02) |
0 (0.0) |
0 (0.0) |
1 (0.01) |
Other Species |
11 (0.05) |
8 (0.03) |
5 (0.02) |
3 (0.01) |
3 (0.01) |
Subtotal |
138 (55.6) |
79 (23.1) |
44 (17.3) |
69 (26.9) |
71 (26.4) |
Birds: |
|||||
Glaucous-winged Gulls (Larus glaucescens) |
14 (5.6) |
28 (8.2) |
43 (16.7) |
31 (12.0) |
35 (13.0) |
Rock Ptarmigan (Lagopus mutus) |
1 (0.01) |
15 (4.4) |
17 (6.7) |
16 (6.2) |
26 (9.6) |
Northern Fulmar (Fulmarus glacialus) |
4 (1.6) |
45 (13.2) |
23 (9.1) |
13 (5.0) |
19 (7.1) |
Tufted Puffins (Lunda cirrhata) |
5 (2.0) |
8 (2.3) |
14 (5.5) |
6 (2.3) |
4 (1.5) |
Ancient Murrelet (Synthliboramphus antiquium) |
0 (0.0) |
4 (1.2) |
11 (4.3) |
10 (3.9) |
8 (3.0) |
Shearwaters (Calonectris spp.) |
4 (1.6) |
15 (4.4) |
12 (4.7) |
6 (2.3) |
4 (1.5) |
Auklets (Aethia or Cyclorrhynchus) |
7 (2.8) |
11 (3.2) |
1 (0.4) |
13 (5.0) |
10 (3.7) |
Aleutian Canada Goose (Branta Canadensis) |
0 (0.0) |
1 (0.3) |
4 (1.6) |
6 (2.3) |
8 (2.9) |
Storm Petrel (Hydrobatinae spp.) |
3 (1.2) |
1 (0.3) |
0 (0.0) |
4 (1.5) |
2 (0.7) |
Northern Pintail (Anas acuta) |
0 (0.0) |
2 (0.6) |
1 (0.4) |
0 (0.0) |
6 (2.2) |
Common Raven (Corvus corax) |
0 (0.0) |
2 (0.6) |
0 (0.0) |
0 (0.0) |
5 (1.8) |
Cormorants (Phalacrocorax spp.) |
4 (1.6) |
9 (2.6) |
6 (2.4) |
8 (3.1) |
0 (0.0) |
Common Eider (Somaternia mollissima) |
3 (1.2) |
2 (0.6) |
4 (1.6) |
4 (1.5) |
5 (1.8) |
Common Murre (Uria aalge) |
3 (1.2) |
5 (1.5) |
5 (2.0) |
7 (2.7) |
3 (1.1) |
Other species |
17 ( 6.9) |
22 (6.4) |
43 (16.9) |
48 (18.7) |
46 (17.1) |
Subtotal |
65 (25.2) |
170 (49.7) |
184 (72.4) |
172 (66.9) |
181 (67.3) |
Total no. prey items |
248 |
342 |
254 |
257 |
269 |