Self-fertilization and the escape from pollen limitation in variable pollination environments

Area of Science:

• Evolutionary Biology
• Plant Reproductive Strategies
• Population Dynamics

Background:

• Many plant species rely on pollinators for seed production, making them vulnerable to environmental fluctuations.
• Unpredictable pollinator availability can threaten plant reproductive success.

Purpose of the Study:

• To investigate how plants can ensure reproduction despite variable pollinator environments.
• To test the hypothesis that evolving selfing mechanisms can mitigate pollinator unpredictability.

Main Methods:

• Development and analysis of heuristic models.
• Modeling plant population dynamics under seed- and site-limited conditions.
• Exploration of mating system evolution, specifically autonomous selfing.

Main Results:

• The threshold for inbreeding depression to maintain outcrossing is higher under pollen limitation with prior selfing than previously thought.
• Environmental variability in pollination significantly reduces the effectiveness of inbreeding depression in promoting outcrossing.
• Stable, intermediate rates of prior selfing can emerge in variable pollination environments.

Conclusions:

• Plant mating systems, particularly selfing, are crucial adaptations for reproductive assurance in unpredictable environments.
• Temporal variation in fitness, influenced by geometric mean, plays a critical role in the evolution of mating systems.
• Understanding these dynamics is vital for predicting plant population persistence and evolution.