Impact of Bee Species and Plant Density on Alfalfa Pollination and Potential for Gene Flow

Table 1

Analysis of variance with pollinator species and plant density on (a) the number of flowers visited per raceme; (b) the number of flowers tripped per raceme; (c) the proportion of open flowers that were visited per raceme; (d) the proportion of visited flowers that were tripped per raceme.

(a) Number of flowers visited per raceme
Source	d.f.	Sum-of-squares	MS	$F$-ratio	$P$
Bee species	6	229.20	38.20	9.77	<.0001
Plant density	1	9.89	9.89	2.53	.11
Bee* Density	6	17.10	2.85	0.73	.63
(b) Number of flowers tripped per raceme
Source	d.f.	Sum-of-squares	MS	$F$-ratio	$P$
Bee species	6	170.47	28.41	13.01	<.0001
Plant density	1	4.99	4.99	2.29	.13
Bee* Density	6	17.40	2.9	1.33	.24
(c) Proportion of open flowers that were visited
Source	d.f.	Sum-of-squares	MS	$F$-ratio	$P$
Bee species	6	3.10	0.52	3.86	.0009
Plant density	1	0.0007	0.0007	0.01	.94
Bee* Density	6	0.84	0.14	1.05	.39
(d) Proportion of visited flowers that were tripped
Source	d.f.	Sum-of-squares	MS	$F$-ratio	$P$
Bee species	6	49.94	8.32	24.27	<.0001
Plant density	1	0.14	0.14	0.42	.52
Bee* Density	6	3.28	0.55	1.59	.15