Table 6. Percentage of variance along g_max and value of the first eigenvalue (×100) with 95% confidence intervals, and loading of the four morphological traits on g_max.

	Percentage of variance along gmax	First eigenvalue	Wing	Tarsus	Mass	Bill
Red billed gull	63.4 (58.28, 69.46)	0.143 (0.118, 0.173)	0.24	0.415	0.839	0.257
Great reed warbler	53.66 (44.69, 64.6)	0.123 (0.082, 0.166)	0.117	0.343	0.669	0.649
Barn swallow - Badajoz	62.97 (49.32, 72.15)	0.159 (0.11, 0.23)	0.178	0.186	0.898	0.356
Barn swallow - Kraghede	63.38 (46.33, 74.2)	0.222 (0.122, 0.335)	0.251	0.309	0.916	0.054
Blue tit - Muro	64.56 (48.99, 70.71)	0.107 (0.069, 0.153)	0.185	0.388	0.752	0.499
Blue tit - Pirio	64.7 (55.52, 73.93)	0.111 (0.073, 0.143)	0.188	0.474	0.814	0.279
Blue tit - Rouvière	59.38 (52.12, 65.7)	0.127 (0.101, 0.16)	0.174	0.274	0.864	0.384
Collared flycatcher	59.5 (55.18, 64.45)	0.131 (0.111, 0.151)	0.154	0.304	0.919	0.2
Savannah sparrow	62.24 (49.06, 68.75)	0.163 (0.11, 0.217)	0.145	0.226	0.8	0.537
House sparrow	73.65 (60.72, 80.16)	0.256 (0.171, 0.383)	0.194	0.494	0.764	0.366