Biology Reference
In-Depth Information
Table 5.1
Colony-level components of pollen hoarding
Generation
tested
Component
Ef ect
Selected
Selectable
Queen cues
Increased pollen-
foraging stimulus
3
No
?
Brood cues
Increased pollen-
foraging stimulus
3
No
?
Brood
quantity
Increased pollen-
foraging stimulus,
increased pollen
consumption, and
increased worker
population
3, 33
Yes
a
Ye s
Worker
population
Potential increase in
total forager
population
3, 33
Yes
b
Ye s
To t a l
foragers
Increase in pollen
foragers
3
No
Yes
c
Number of
pollen
foragers
Increase in pollen
intake
3, 5, others
Yes
Yes
Proportion
of pollen
foragers
d
Increase in pollen
intake
3, 5, others
Yes
Yes
Note:
Shown here are potential colony-level traits that could increase the amount of
pollen stored in colonies. Some of these traits did change as a consequence of selection for
pollen hoarding, but others did not. In the “Selected” column, a trait was considered
selected if there were dif erences between the high and low strains. Traits were selectable
if dif erences were observed between sublines within the strains but not between the
strains, for instance, between Q and R in Figure 5.5.
a. h is ef ect is based on the constraint placed on the brood-nest size by the storage of
surplus pollen.
b. h is ef ect is based on the constraint placed on rearing of brood by the storage of
surplus pollen, and the shorter life span of high-strain bees; however, it did not increase
the number of foragers.
c. Signii cant variation was found between sublines of highs and lows, but there were no
mean dif erences between the strains. h
is showed that genetic variation existed but had
not been selected.
d. Proportion is calculated as (number of pollen foragers)/(total foragers).
