Supporting Information
Additional Supporting Information may be found in the online version of this article.
Table S1. Sample size, in number of birds, for each local recruitment age. Note that very old
local recruits may have bred elsewhere before recruiting at the Banter See, and that their
reduced breeding probability throughout life may reflect a reduced site fidelity, rather than (or
as well as) an in increased probability of skipped breeding (also see Zhang et al. 2014). Detailed
future study of post-recruitment sighting records of these birds will be required to distinguish
between these two alternatives, and we are planning such work.
Table S2. Sample size, in number of bird-years, at each level of age for each trait. Note that
for breeding probability age 16 includes the bird-years from age 16 to 19 inclusive.
Table S3. Results from model comparison to test the interaction effects of age and sex on seven
traits in the common tern. Model 1 represents a model with age, while model 2 represents a
model including the sex*age interaction. Shown are AIC values (with degrees of freedom), with
those for the best supported models marked in bold for each trait.
Supporting information
Table S1. Sample size, in number of birds, for each local recruitment age. Note that very old
local recruits may have bred elsewhere before recruiting at the Banter See, and that their
reduced breeding probability throughout life may reflect a reduced site fidelity, rather than (or
as well as) an in increased probability of skipped breeding (also see Zhang et al. 2014). Detailed
future study of post-recruitment sighting records of these birds will be required to distinguish
between these two alternatives, and we are planning such work.
Recruitment age
N birds
2
24
3
259
4
147
5
44
6
7
7
10
8
5
9
1
10
0
11
2
Table S2. Sample size, in number of bird-years, at each level of age for each trait. Note that
for breeding probability age 16 includes the bird-years from age 16 to 19 inclusive.
Age
Arrival
date
Breeding
probability
Laying
date
Egg
volume
Clutch
size
Brood
size
No. of
fledglings
2
22
24
21
19
21
21
21
3
267
281
221
217
222
222
222
4
338
372
279
277
279
279
279
5
338
370
274
272
274
274
274
6
294
335
247
244
247
248
248
7
237
281
207
203
207
207
207
8
200
235
176
174
176
176
176
9
148
184
132
132
132
132
132
10
113
140
103
103
104
105
105
11
80
98
72
71
72
72
72
12
56
71
52
52
52
50
50
13
33
47
38
38
38
37
37
14
21
32
26
26
26
26
26
15
13
20
18
18
18
16
16
16
8
15
9
9
9
9
9
Table S3. Results from model comparison to test the interaction effects of age and sex on seven
traits in the common tern. Model 1 represents a model with age, while model 2 represents a
model including the sex*age interaction. Shown are AIC values (with degrees of freedom), with
those for the best supported models marked in bold for each trait.
Model
1
2
Arrival
Breeding
Laying
Egg
Clutch
Brood
No. of
date
probability
date
volume
size
size
fledglings
-5164.3
1457.4
-4994.3
-5115.3
5559.6
5619.7
3488.0
(12)
(11)
(12)
(12)
(11)
(11)
(11)
-5156.5
1457.8
-4984.7
-5111.0
5566.9
5631.5
3494.4
(14)
(13)
(14)
(14)
(13)
(13)
(13)