What looks like a plant’s failed fruit may actually be a clever deal that lets both the plant and its pollinating beetles survive.
Japanese red elder plants protect their own survival by dropping fruits that contain Heterhelus beetle larvae. Surprisingly, this process also allows the beetle larvae to survive.
According to a study from Kobe University, this unusual interaction changes how scientists understand the balance between plants and the insects that pollinate them.
When Pollination and Conflict Overlap
In some plant insect relationships, the insect both pollinates the plant and uses the fruit as a place for its offspring to develop. Biologists call this type of relationship “nursery pollination mutualism.” Kobe University botanist Kenji Suetsugu explains, “These interactions are fascinating because they sit on the boundary between cooperation and conflict.”
Well-known examples include figs and fig wasps and yuccas and yucca moths. In these cases, plants often control insect populations by dropping fruits that contain too many larvae.
When Pollination and Conflict Overlap
In some plant insect relationships, the insect both pollinates the plant and uses the fruit as a place for its offspring to develop. Biologists call this type of relationship “nursery pollination mutualism.” Kobe University botanist Kenji Suetsugu explains, “These interactions are fascinating because they sit on the boundary between cooperation and conflict.”
Well-known examples include figs and fig wasps and yuccas and yucca moths. In these cases, plants often control insect populations by dropping fruits that contain too many larvae.
Because the larvae die when the fruit falls, scientists have long viewed this as a punishment system that keeps the partnership balanced.
However, Suetsugu began to question whether this explanation applied to Japanese red elder plants. “I once observed Japanese red elder flowers full of Heterhelus beetles mating and feeding, and I also saw fruits infested by the beetles’ larvae dropping in large numbers.
However, Suetsugu began to question whether this explanation applied to Japanese red elder plants. “I once observed Japanese red elder flowers full of Heterhelus beetles mating and feeding, and I also saw fruits infested by the beetles’ larvae dropping in large numbers.
With such seemingly great losses to both sides, I wondered whether this was really punishment and how the insects keep their losses contained,” says Suetsugu, voicing suspicion that there is something missing in the current narrative of the sanction-driven balance in nursery pollination mutualisms.
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