Ant-Mediated Biological Control in Agroecosystems
Summary
Ants occupy pivotal roles in agroecosystems by providing natural pest regulation that diminishes reliance on synthetic chemicals. Their social organisation, high foraging efficiency and varied diets enable them to suppress herbivorous insects across a range of cropping systems. In tropical fruit and tree crops, aggressive arboreal species patrol canopies and prey upon key pests, while ground-foraging ants intercept soil-dwelling larvae and pupae. Ant–plant and ant–hemipteran mutualisms can both enhance and compromise control services: ants defend honeydew-producing pests but also deter herbivores and their natural enemies. Landscape complexity, microhabitat structure and crop management influence ant community composition, nest distribution and foraging behaviour, thereby modulating biological control outcomes. Understanding functional responses of ant predators to varying pest densities, the stability of multispecies antagonistic interactions and the interplay between ant mutualisms and ecosystem services is critical for designing agroecological strategies that harness ants as reliable and sustainable biocontrol agents.
Research from Nature Portfolio
Recent studies have demonstrated that combining distinct biological control agents can produce unexpectedly stable pest suppression. By modelling interactions among a pest, its specialist predator and a pathogen, researchers revealed that a three-dimensional antagonistic network withstands perturbations far better than simpler two-species systems. Contrary to traditional expectations that additional negative interactions increase instability, the inclusion of interlinked predator–pathogen dynamics can stabilise population fluctuations and maintain pests below economic thresholds. This insight underscores the potential of integrated biocontrol approaches, in which multiple natural enemies are deliberately managed to reinforce one another and stabilise pest control services.
Ant-Mediated Biological Control in Agroecosystems publication trend
The graph below shows the total number of articles in ant-mediated biological control in agroecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Biological control agent: A living organism used to reduce pest populations via predation, parasitism or competition.
Functional response: The relationship between predator attack rate and prey density, often classified into types I, II or III.
Keystone species: A taxon whose ecological roles exert a disproportionately large effect on community structure.
Mutualism: A symbiotic interaction in which both partners derive benefit, such as ants tending hemipterans for honeydew.
Extrafloral nectaries: Nectar-producing plant glands located outside flowers that can attract and reward predatory insects.
References
- Coupling unstable agents in biological control. Nature Communications (2015).
- Ants: Major Functional Elements in Fruit Agro-Ecosystems and Biological Control Agents. Sustainability (2017).
- Weaver Ants Provide Ecosystem Services to Tropical Tree Crops. Frontiers in Ecology and Evolution (2019).
- A Keystone Ant Species Provides Robust Biological Control of the Coffee Berry Borer Under Varying Pest Densities. PLOS ONE (2015).
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