Some Unresolved Issues of Measuring the Efficiency of Pollinators: Experimentally Testing and Assessing the Predictive Power of Different Methods
Table 2
Number of pollen grains deposited by the visitors on the stigmas of different plant species.
Visitor species
Number of pollen grains deposited on the stigma
Alfalfa
Toria
Carrot
Bath sponge
A. ilerda
-
56 ±11.7
-
-
A. leaena
-
-
19 ±6.8
-
A. dorsata
49 ±2.8
73 ±11.5
-
-
A. florea
nt
48±10.2
16±5.2
235 ±23.2
A. mellifera
44 ±3.3
63 ±9.8
-
-
C. cephalotes
29 ±3.5
-
-
-
C. rubripes
40 ±3.1
-
-
-
M. nana
34 ±4.7
-
-
-
Halictus sp.
-
-
-
292 ± 28.9
Melissodes sp.
-
-
-
454 ± 32.4
Syrphid flies
-
33 ±7.3
11 ±3.5
-
X. fenestrata
-
-
-
1109 ± 71.3
L.S.D. (p<0.05)
3.4
6.3
1.8
23.6
Mean ± SD of 50 observations; values have been rounded off to the nearest whole number; nt= species acted as a nectar thief; -: pollinator species was not present.
