Table 2.

Generalized linear model analysis of the effects of levels of nectar robbing and observation date on visitation rate (number of pollinators per plant per 10 min) of all bumble bees, B. religiosus and B. friseanus

	Total number			B. religiosus			B. friseanus
	χ2	d.f.	Sig.	χ2	d.f.	Sig.	χ2	d.f.	Sig.
Levels of nectar robbing	0·158	2	0·924	0·468	2	0 ·791	0·982	2	0·612
Observation date	3·941	2	0·139	3·838	2	0 ·147	0·282	2	0·868
No. of flowers per plant	0·046	1	0·831	0·013	1	0 ·91	0·076	1	0·783

In this model, number of flowers per plant was set as a covariate factor.