Table 1.

Percentage variance in host preference estimates attributed to among-site effects as estimated by variance components analysis for all long-established sites and all recently colonized sites separately. (Est., established sites; RC, recently colonized sites (since 1990). The significance of a difference in among-site variance of this magnitude when tested using permutations (see main text description) is given (‘p’).)

	no. sites (est., RC)	median no. quartets per site (min.-max.)	% variance attributed to among-site effects		p
			established sites	recently colonized sites
H. nummularium preference	10, 5	10 (6–33)	69.2	15.7	0.095
G. molle preference	9, 5	10.5 (5–31)	24.9	12.9	0.722