Table 1.

Experimental design showing different treatments with relative densities of hosts and absolute diversity of nonhosts in the three experiments: Attack Rate, Foraging Activity, and Change of Behaviour Over Time. Hosts for the parasitoids A. megourae and L. fabarum were the aphids M. viciae (Mv) and A. fabae (Af), respectively. Nonhosts for A. megourae were A. fabae (Af) and M. persicae (Mp), and for L. fabarum were M. viciae (Mv) and M. persicae (Mp)

Treatment	Relative host abundance	Parasitoid	Aphid numbers in the different experiments
			Attack Rate		Foraging Activity		Change of Behavior
			Host	NonHost	Host	Nonhost	Host	Nonhost
1. Host Only	100	A. megourae	20 Mv	–	6 Mv		6 Mv
		L. fabarum	20 Af	–	6 Af		6 Af
2. Low Density Low DiversityNonHost A	33	A. megourae	20 Mv	40 Af	6 Mv	12 Af	6 Mv	12 Af
		L. fabarum	20 Af	40 Mv	6 Af	12 Mv	6 Af	12 Mv
3. High Density Low DiversityNonHost A	25	A. megourae	20 Mv	80 Af	6 Mv	24 Af
		L. fabarum	20 Af	80 Mv	6 Af	24 Mv
4. Low Density Low DiversityNonHost B	33	A. megourae	20 Mv	40 Mp	6 Mv	12 Mp
		L. fabarum	20 Af	40 Mp	6 Af	12 Mp
5. High Density Low DiversityNonHost B	25	A. megourae	20 Mv	80 Mp	6 Mv	24 Mp
		L. fabarum	20 Af	80 Mp	6 Af	24 Mp
6. Low Density High DiversityNonHost A and B	33	A. megourae	20 Mv	20 Af and 20 Mp	6 Mv	6 Af and 6 Mp	6 Mv	6 Af and 6 Mp
		L. fabarum	20 Af	20 Mv and 20 Mp	6 Af	6 Mv and 6 Mp	6 Af	6 Mv and 6 Mp
7. High Density High DiversityNonHost A and B	25	A. megourae	20 Mv	40 Af and 40 Mp	6 Mv	12 Af and 12 Mp
		L. fabarum	20 Af	40 Mv and 40 Mp	6 Af	12 Mv and 12 Mp