Table 2.
Egg rejection response and latency to rejection by thrushes
|
Type of parasitism |
Blackbird |
Song thrush |
||||
|---|---|---|---|---|---|---|
| ddf | F | P | ddf | F | P | |
|
CONSPECIFIC |
|
|
|
|
|
|
|
(R)ejection |
|
|
|
|
|
|
| Breeding density |
105 |
5.31 |
0.02 |
41 |
3.01 |
0.09 |
| Clutch |
101 |
1.43 |
0.24 |
39 |
0.79 |
0.38 |
| Nest stage |
98 |
1.00 |
0.40 |
35 |
0.67 |
0.57 |
| Laying date |
97 |
0.92 |
0.34 |
38 |
0.63 |
0.43 |
|
Latency to (r)ejection |
|
|
|
|
|
|
| Breeding density |
48 |
2.94 |
0.09 |
11 |
1.22 |
0.29 |
| Clutch |
44 |
0.19 |
0.66 |
11 |
5.13 |
0.04 |
| Nest stage |
41 |
0.70 |
0.56 |
8 |
1.38 |
0.32 |
| Laying date |
47 |
0.64 |
0.43 |
7 |
0.05 |
0.82 |
|
INTERSPECIFIC |
|
|
|
|
|
|
|
Ejection |
|
|
|
|
|
|
| Geography |
455 |
7.30 |
0.0008 |
216 |
0.59 |
0.55 |
| Egg model |
455 |
29.57 |
<0.0001 |
216 |
20.40 |
<0.0001 |
| G*E |
446 |
1.11 |
0.33 |
206 |
0.24 |
0.79 |
| Clutch |
449 |
0.40 |
0.53 |
208 |
0.70 |
0.40 |
| Nest stage |
455 |
5.41 |
0.001 |
213 |
2.31 |
0.08 |
| Laying date |
448 |
0.04 |
0.85 |
212 |
1.63 |
0.20 |
|
Latency to ejection |
|
|
|
|
|
|
| Geography |
308 |
0.16 |
0.86 |
101 |
2.53 |
0.08 |
| Egg model |
308 |
29.87 |
<0.0001 |
101 |
0.33 |
0.57 |
| G*E |
300 |
2.53 |
0.08 |
95 |
1.33 |
0.27 |
| Clutch |
303 |
0.29 |
0.59 |
101 |
7.99 |
0.006 |
| Nest stage |
308 |
3.86 |
0.01 |
98 |
1.97 |
0.12 |
| Laying date | 302 | 0.05 | 0.82 | 97 | 0.40 | 0.53 |
Response to conspecific egg in blackbirds includes nest desertion (i.e., abandoning the whole clutch), together with egg ejection (i.e., selective removal of a foreign egg), as rejection response to parasitism (see Results, and the Additional file 1: Appendices). All other responses (conspecific in song thrush, and interspecific in both thrushes) exclude desertion from analyses (for complete results, see Additional file 1: Appendix 2). Test statistics and P-values for non-significant terms are from backward elimination procedure just before the particular term (being the least significant) was removed from the model. Results of significant predictors from final models are in boldface. For effect sizes see Figures 2, 3 and Results. G = geography, E = egg model.