Concept explainers
Who’s the Pollinator? Massonia depressa is a low-growing succulent plant native to the desert of South Africa. The dull-colored flowers of this
A The dull petalless, ground-level flower of Massonia depressa are accessible to rodents, who push their heads through the stamens to reach the nectar at the bottom of floral cups. Note the pollen on the gerbil’s snout.
B Evidence of visits to M. depressa by rodents.
Mammals allowed access to plants | Mammals excluded from plants | |
Percent of plants that set fruit | 30.4 | 4.3 |
Average number of fruits per pant | 1.39 | 0.47 |
Average number of seeds per plant | 20.0 | 1.96 |
C Fruit and seed production of M. depressa with and without visits by mammals. Mammals were excluded from plants by wire cages with openings large enough for insects to pass through. Twenty-three plants were tested in each group.
FIGURE 29.7 Testing pollination of M. depressa by rodents.
How did the average number of seeds of produced by caged plants compare with that of control plants?
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