Table 1.

Topology descriptors of the pollination networks in five Galápagos islands. P and A, number of plant and animal species, respectively; S, network size (P+A); I, number of realized interactions; C, connectance (I/AP); IE, interaction evenness; , index of network specialization; WNODF, weighted nestedness metric; X ± s.d., mean ± standard deviation. For each plant (p) and animal (a) species, the number of links (L), generality (G), and index of species specialization (d′) are also given. Interaction weight in the quantitative networks is the number of visited flowers by each pollinator species standardized by census time and flower abundance in the community. For each L and d′ column, values sharing the same letter are not significantly different (p < 0.05). All WNODF values are significant (p < 0.001).

Island	P	A	S	I	C	Lp (X±s.d.)	La (X±s.d.)	Gp	Ga	IE		(X±s.d.)	(X±s.d.)	WNODF
Fernandina	18	60	78	125	0.12	6.94±5.43a	2.08±1.60ac	1.60	8.06	0.69	0.70	0.62±0.18a	0.44±0.25a	9.21
Pinta	21	76	97	133	0.08	6.33±7.04a	1.75±1.65a	1.68	12.38	0.76	0.52	0.65±0.21a	0.44±0.23a	10.41
Santiago	24	69	93	168	0.10	7.00±5.26a	2.43±3.13ab	2.20	3.84	0.51	0.49	0.52±0.25a	0.49±0.22a	13.25
Santa Cruz	23	76	99	215	0.12	9.35±6.53b	2.83±3.40b	2.13	6.36	0.60	0.60	0.49±0.16a	0.47±0.20a	16.04
San Cristóbal	21	93	114	234	0.12	11.14±8.63b	2.52±2.68cb	2.93	4.77	0.66	0.59	0.46±0.23a	0.39±0.18a	17.84
all islands	60	220	280	758	0.06	12.63±3.51	3.45±4.61	3.28	9.69	0.67	0.57	0.52±0.19	0.42±0.22	11.87