Table 1. Results of the generalized linear model to analyze the effect of color morphs of Gentiana lutea on the visitation rate (number of visits per plant per 30 min) by eight bumblebee groups in two areas of Northern Spain (the orange color morph was present at the Ancares site, whereas the yellow morph was present at the Pontón site).

We marked in bold the statistically significant factors (P < 0.05). Factors: locality (Ancares and Pontón, orange and yellow morph population respectively); treatment (control, local transplants, and foreign transplants); and floral visitor groups (group 1, Bombus terrestris, B. lucorum; group 2, B. hortorum, B. jonellus; group 3, B. pratorum, B. soroensis ancaricus, B. lapidarius decipiens; group 4, B. wurflenii; group 5, B. mesomelas; group 6, B. pascuorum; group 7, B. (Psithyrus) rupestris; group 8, B. hypnorum).

Factors	Wald Chi-Square	d.f.	P
Locality	0.702	1	0.402
Treatment	0.110	2	0.946
Treatment * Locality	4.336	2	0.114
Floral visitors	66.548	3	<0.001
Treatment * Floral visitors	16.703	6	0.010
Treatment * Floral visitors * Locality	19.573	9	0.021