Carnivorous plants and wasps blur the line between friend and food

by the Okinawa Institute of Science and Technology
May 5, 2026

Acid-filled pitchers complete with fangs. Labyrinthine chambers decorated with bristles. Leaves that snap shut in less than a second. Employing strategies like these, carnivorous plants have a reputation as fearsome predators, but a new study published in the journal Ecology suggests they may do more to help their insect neighbors than previously thought.

Researchers at the Okinawa Institute of Science and Technology (OIST) have found that the nectar of pitcher plants — carnivorous plants named for their specialized pitcher-shaped leaves that trap and digest prey — constitutes an important part of the diet for their most abundant prey, vespid wasps. While this interaction was previously thought to represent a clear-cut predator-prey relationship, this study provides evidence that it may be more accurately described as a form of mutualism, where both sides benefit. Far from being a burden on local insects, these plants may be integral to the stability of their local ecosystems.

“Generally, we ecologists like to categorize relationships as just being one fixed, discrete type of interaction, such as predator-prey or competitive,” says the study’s senior author Professor David Armitage, from OIST’s Integrative Community Ecology Unit. “But what we’re becoming more aware of is that these ecological interactions are much more context-dependent and fluid.”

Keep reading: https://www.oist.jp/news-center/news/2026/5/5/carnivorous-plants-and-wasps-blur-line-between-friend-and-food

Read the Ecology paper: https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecy.70395