Do flowers wave to attract pollinators? A case study with Silene maritima.

Area of Science:

• Ecology
• Evolutionary Biology
• Plant Science

Background:

• Floral traits evolve under selective pressures, including pollinator interactions.
• Understanding the heritability and adaptive significance of floral movement is crucial for plant reproductive success.

Purpose of the Study:

• To investigate the role of floral mobility in attracting pollinators and influencing reproductive fitness in Silene maritima.
• To determine the heritability of floral mobility and its relationship with pollinator visitation and seed set.

Main Methods:

• Assessing the heritability of floral mobility in Silene maritima.
• Observing pollinator visits to flowers with varying stalk waviness.
• Conducting controlled pollinations to measure seed set in relation to floral mobility and visit duration.

Main Results:

• Floral mobility is heritable, with intermediate stalk waviness attracting the most insect visitors.
• While highly mobile flowers had shorter individual visit durations, they received more frequent visits, compensating for duration.
• Low and high floral mobility were associated with reduced seed set, indicating a potential fitness cost.

Conclusions:

• A trade-off exists between floral waving for pollinator attraction and excessive mobility that hinders effective pollination.
• Stabilizing selection may favor intermediate floral stalk traits, balancing pollinator attraction with pollination efficiency.
• Floral mobility significantly impacts plant fitness through its effects on pollinator interactions and seed production.