SEX-RATIO BIAS WITH ASYMMETRIC EXCHANGE OF POLLEN BETWEEN DEMES

Area of Science:

• Plant reproductive biology
• Ecology
• Evolutionary biology

Background:

• Hermaphroditic plants face competition for reproductive success.
• Pollen migration between plant patches is typically low.
• Environmental factors like wind can influence reproductive strategies.

Purpose of the Study:

• To investigate how prevailing winds affect local pollen competition within hermaphroditic plant patches.
• To determine if wind creates sex ratio gradients in plant populations.
• To understand the adaptive significance of resource allocation in response to wind-induced competition.

Main Methods:

• Modeling pollen competition dynamics in a spatially structured plant population.
• Analyzing the effects of wind-driven pollen dispersal on reproductive success.
• Simulating resource allocation strategies in hermaphroditic plants under varying competition levels.

Main Results:

• A prevailing wind creates a gradient in local pollen competition strength within a patch.
• This gradient results in a sex ratio gradient, with downwind individuals exhibiting a male (pollen) bias.
• The male bias is a response to reduced local reproductive value, favoring gametes with greater long-range success.

Conclusions:

• Wind patterns can significantly shape plant reproductive strategies and population structure.
• Sex ratio gradients can arise as an adaptive response to environmental factors influencing competition.
• Understanding these dynamics is crucial for predicting plant population evolution and community ecology.