Pollination Biology of Potentilla recta (Sulfur Cinquefoil) and Its Cooccurring Native Congener Potentilla gracilis in Northeastern Oregon

Table 4

Electivity indices for pollinator taxa under conditions of equal flower abundance. 𝑅: proportion of total pollinator population visiting plant sulfur cinquefoil; 𝑃: proportion of sulfur flowers among all cinquefoil flowers; 𝐸: electivity index = (𝑅_sulfur−𝑃_sulfur)/(𝑅_sulfur+𝑃_sulfur).

Pollinator	Tot obs	No. of sulfur	No. of native	𝑅	𝑃	𝐸
Apis mellifera	11	10	1	0.91	0.5	0.29
Megachile—2 spp.	5	4	1	0.80	0.5	0.23
Bombus—3 spp.	7	4	3	0.57	0.5	0.07
Halictus—3 spp.	21	9	12	0.43	0.5	−0.08
Andrena—2 spp.	13	3	10	0.23	0.5	−0.37
Ceratina nanula	19	4	15	0.21	0.5	−0.41
Hylaeus—2 spp.	5	1	4	0.20	0.5	−0.43
Syrphidae—3 spp.	6	1	5	0.17	0.5	−0.50
Coleoptera—3 spp.	10	0	10	0.00	0.5	−1.00