Olfactory Communication in Insect Systems

Insects rely on olfactory communication to navigate complex environments, locate resources and coordinate social behaviours. Volatile chemicals emitted by plants, conspecifics or predators serve as semiochemicals that are detected by specialised olfactory receptor neurons housed primarily in the antennae. Signals such as pheromones, kairomones and allomones can elicit mating, aggregation, alarm or avoidance responses. Within the peripheral nervous system, odour molecules bind to receptor complexes—often comprising odorant receptors or ionotropic receptors paired with coreceptor subunits—initiating ion flux and electrical signalling. These signals are relayed to discrete glomeruli in the antennal lobe, where patterns of neural activity are translated into behavioural decisions. Learning, physiological status and ecological context modulate both peripheral sensitivity and central processing, enabling insects to adapt to changing odour landscapes. Advances in genomics, imaging and functional assays have revealed the molecular diversity of receptor families and the neural architectures that underpin rapid and specific odour discrimination. Understanding these systems has global significance for pollination biology, pest management and conservation of beneficial species.

Research from Nature Portfolio

Recent studies have uncovered how olfaction gates species-specific behaviours in ecological specialists. In a model drosophilid, loss of olfactory input abolishes oviposition preference for a native host, demonstrating that specific odours act as permissive cues for egg-laying. A key compound, hexanoic acid, is detected via an ionotropic receptor whose tuning has evolved to match host-fruit chemistry. Receptor exchange experiments confirm that adaptive changes in receptor binding underlie behavioural divergence, illustrating a direct link between odour-receptor specificity and ecological specialism.

Research from all publishers

In social ants, high-resolution imaging of antennal lobes has shown that alarm pheromones activate a remarkably small and stereotyped set of glomeruli, with multiple cues converging on a single core glomerulus to trigger panic responses. This sparse encoding contrasts with earlier models of broad combinatorial representation and highlights a simple neural architecture for rapid alarm communication. In mosquito vectors, advances in chemical ecology and genomics have mapped olfactory circuits that drive host-seeking, oviposition and plant-feeding. Novel semiochemicals have been identified that specifically attract or repel Aedes species, and factors such as learning, microbial infection and physiological state are now recognised as critical modifiers of olfactory behaviour. In parallel, materials science has delivered precision pheromone-release systems based on fibrous polymer carriers. These formulations allow sustained, controlled dispersal of sex or aggregation pheromones, offering environmentally benign tools for mating disruption and pest management in agricultural and urban settings.

Olfactory Communication in Insect Systems publication trend

The graph below shows the total number of articles in olfactory communication in insect systems across all publications each year (not limited to Nature Index journals).

Technical terms

Pheromone: A species-specific volatile compound emitted to elicit innate behavioural or physiological responses in conspecifics.

Semiochemical: Any chemical substance that conveys information between organisms, including pheromones, allomones and kairomones.

Olfactory receptor neuron (ORN): A sensory cell expressing chemosensory receptors that transduces odour signals into electrical impulses.

Glomerulus: A discrete neuropil in the antennal lobe where ORN axons synapse onto projection and local interneurons, forming spatial odour maps.

Ionotropic receptor: A ligand-gated ion channel that opens upon binding of a specific chemical ligand, mediating rapid sensory transduction.

References

1. Sparse and stereotyped encoding implicates a core glomerulus for ant alarm behavior. Cell (2023).
2. Odor-regulated oviposition behavior in an ecological specialist. Nature Communications (2023).
3. Chemical Ecology and Management of Dengue Vectors. Annual Review of Entomology (2023).
4. Design of Polymer Carriers for Optimized Pheromone Release in Sustainable Insect Control Strategies. Advanced Science (2023).