More examples of breakdown the 1:1 partner specificity between figs and fig wasps

Area of Science:

• Ecology
• Evolutionary Biology
• Entomology

Background:

• The fig-wasp mutualism is a model for co-evolution, often considered highly specific.
• Recent findings suggest pollinator sharing among fig species and hybridization are more common than previously thought.

Purpose of the Study:

• To investigate pollinator sharing among 13 Chinese fig tree species.
• To determine the extent of co-pollination within fig species.

Main Methods:

• Rearing pollinating fig wasps from figs of 13 Chinese fig tree species.
• Identifying wasp species using genetic methods.

Main Results:

• Pollinator sharing was frequent among closely related dioecious fig species.
• When multiple pollinators occurred in one host, one species was usually dominant, except in Ficus triloba.
• Co-pollination extent correlated with pollinator dispersal ability, particularly in dioecious figs.

Conclusions:

• The study provides further evidence for the breakdown of extreme specificity in fig wasp-fig tree interactions.
• Host expansion and pollinator sharing are likely underestimated, especially in dioecious figs.
• Heterospecific pollen transfer by shared pollinators could lead to increased, underestimated hybridization events.