Table 1. Individual values and averages (with 95% confidence intervals) for 36 breeding attempts of 29 Fan-tailed Gerygone pairs in New Caledonia, during the breeding seasons from 2011/12 to 2015/16, based on 17 microsatellite markers.

ID: number of breeding attempt (corresponding to Fig 1); Pair: number of breeding pair; N: number of sampled individuals in the breeding attempt (including the breeding pair); Allele number: mean number of alleles per locus; Allelic richness: mean allelic richness per locus; HE: unbiased expected heterozygosity; HO: observed heterozygosity, F value: relatedness between individuals; Paternity: all offspring sired by one male (within-pair: WP) or two males (extra-pair: EP); offspring skin colour (poly means both colours occur in a brood); Parasitism: whether a brood was parasitized by Shining Bronze-cuckoo (1 –parasitized, 0 –not parasitized); Genetic constitution: colour based on the first three Principal Coordinates calculated on Euclidean distances and transformed into RGB values.

ID	Pair	N	Allele number	Allelic richness	HE	HO	F value	Paternity	Skin colour	Parasitism	Genetic constitution
1	1	4	2.53	1.54	0.54	0.65	0.146	WP	bright	0
2	2	3	2.35	1.53	0.53	0.51	0.150	WP	bright	0
3	3	5	2.82	1.56	0.56	0.66	0.102	WP	bright	0
4	4	3	2.29	1.58	0.58	0.71	0.199	WP	bright	0
5	5	4	2.71	1.71	0.59	0.71	0.139	WP	dark	0
6	5	4	2.82	1.49	0.60	0.71	0.165	WP	poly	1
7	6	4	2.82	1.65	0.59	0.74	0.149	WP	dark	0
8	6	3	2.82	1.64	0.66	0.78	0.055	WP	dark	1
9	7	4	3.18	1.59	0.68	0.81	0.108	WP	bright	0
11	9	5	3.29	1.59	0.62	0.73	0.130	WP	bright	0
12	10	5	2.47	1.72	0.48	0.60	0.236	WP	bright	0
13	11	4	2.82	1.68	0.59	0.69	0.156	WP	bright	0
14	12	3	2.65	1.62	0.60	0.65	0.109	WP	bright	0
15	13	4	2.65	1.58	0.56	0.71	0.307	WP	dark	0
16	14	5	2.29	1.62	0.49	0.64	0.317	WP	bright	0
17	15	4	3.12	1.48	0.61	0.71	0.159	WP	bright	0
18	16	4	2.59	1.59	0.51	0.57	0.181	WP	bright	0
20	18	4	2.35	1.56	0.50	0.64	0.299	WP	bright	0
21	19	4	2.59	1.49	0.52	0.65	0.181	WP	bright	0
22	20	4	3.00	1.61	0.65	0.75	0.118	WP	bright	0
24	21	3	3.24	1.56	0.71	0.78	0.124	WP	bright	1
25	22	3	2.88	1.50	0.65	0.78	0.268	WP	bright	1
26	23	3	2.88	1.53	0.64	0.75	0.062	WP	dark	0
27	24	4	2.94	1.52	0.58	0.69	0.164	WP	bright	0
28	25	4	2.82	1.70	0.53	0.59	0.099	WP	unknown	0
29	26	3	2.29	1.56	0.56	0.71	0.099	WP	dark	0
30	27	4	2.65	1.61	0.55	0.66	0.115	WP	poly	0
31	28	3	2.47	1.55	0.53	0.63	0.059	WP	dark	1
32	28	5	2.65	1.66	0.49	0.61	0.180	WP	mixed	0
35	29	5	2.94	1.62	0.61	0.78	0.156	WP	bright	0
Average WP ±95%CI			2.73±0.10	1.59±0.02	0.58±0.02	0.69±0.03	0.158±0.025			0.17
10	8	4	3.06	1.60	0.62	0.71	0.092	EP	bright	0
19	17	4	2.94	1.60	0.56	0.63	0.198	EP	bright	0
23	21	4	3.41	1.51	0.62	0.69	0.122	EP	bright	0
33	28	4	3.06	1.53	0.61	0.66	0.174	EP	dark	0
34	29	4	3.53	1.65	0.66	0.74	0.043	EP	bright	1
36	29	4	3.59	1.61	0.70	0.79	0.039	EP	poly	0
Average EP ±95%CI			3.26±0.22	1.58±0.04	0.63±0.04	0.70±0.05	0.111±0.053			0.17