Appendix C. Comparison of baseline levels of circulating corticosterone and other parameters (sex, mass, body size, body condition, etc.) for adult kittiwakes from manipulated nests (eggs removed) and unmanipulated nests (adults raising chicks) at Shoup Bay, Alaska, late in the 1994 chick-rearing period.
Bird
Group†
Sex‡
Mass (g)
Body
size§
Body
condition||
Sample
time (mins)
[Cort]
(ng/mL)
Resighted in 1995 or 1996?
25
1C
F
369
-0.3
-10.99
1.33
8.94
Y
21
1C
F
365
-0.61
-10.55
1.17
9.55
Y
14
1C
F
328
-1.23
-16.89
1.50
45.74
Y
33
1C
M
382
0.86
-13.10
1.67
11
Y
17
1C
M
367
0.95
-16.86
1.42
11.06
Y
23
1C
M
450
1.44
-0.45
2.33
13.27
Y
28
1C
M
397
0.92
-9.96
2.58
21.86
Y
9
2C
F
375
-0.49
-8.68
1.83
8.81
Y
32
2C
F
371
0.78
-15.28
1.25
12.48
N
34
2C
M
362
0.52
-16.27
2.00
10.27
Y
4
2C
M
406
0.71
-6.94
2.43
16.43
Y
35
M
?
464
0.17
9.24
1.50
7.54
Y
27
M
F
397
0.28
-7.03
1.83
5.19
Y
19
M
F
366
-0.20
-12.20
2.00
5.58
Y
15
M
F
387
0.11
-8.61
2.83
9.12
Y
5
M
M
438
0.40
1.94
2.25
5.64
N
6
M
M
447
1.41
-0.99
1.33
6.03
N
20
M
M
467
2.28
-0.67
1.28
7.57
Y
26
M
M
418
0.56
-3.48
3.00
7.68
Y
31
M
M
414
-0.10
-1.20
1.58
8.92
Y
36
M
M
431
0.84
-1.84
2.67
9.76
Y
18
M
M
447
1.9
-3.23
2.25
12.48
Y
24
M
M
452
0.37
5.35
2.00
13.04
Y
29
M
M
421
0.65
-3.22
2.00
20.56
Y
†Numbers show the unmanipulated brood size of the experimental birds, M (manipulated) indicates that eggs were removed.
‡Determined through behavioral observations (see Methods); F, female; M, male.
§A principle component factor score; larger values represent larger birds (see Golet and Irons 1999)
||A body condition index that expresses the mass of the bird relative to a mass predicted based on the bird=s size; the more negative the value, the worse the condition (see Golet and Irons 1999)
Literature cited
Golet, G. H., and D. B. Irons. 1999. Raising young reduces body condition and fat stores in Black-legged Kittiwakes. Oecologia 120:530–538.