Sensory Ecology of Flower-Visiting Insects

Flower-visiting insects rely on a suite of sensory modalities to locate, evaluate and exploit floral resources, driving both plant and pollinator diversification. Olfactory cues such as floral volatiles guide long-distance orientation, while visual signals—including colour, pattern and brightness—mediate approach under varying light conditions. At close range, mechanosensory and gustatory receptors on the proboscis and antennae assess nectar availability, floral texture and structural fit. The integration of these modalities enables insects to optimise energy gain, avoid predators or antagonists and make adaptive foraging decisions. Learning further refines innate preferences, allowing pollinators to respond flexibly to spatial and temporal variation in floral rewards. This multimodal framework has broad implications for ecosystem stability and crop productivity, as changes in sensory landscapes—through habitat modification, light pollution or climate-driven shifts in flower phenology—can disrupt communication between plants and their primary pollinators. By elucidating the mechanisms and ecological contexts of sensory processing, researchers can inform the design of pollinator-friendly habitats, guide plant breeding for enhanced pollination services and predict the resilience of plant–insect networks in a changing world.

Research from Nature Portfolio

Recent studies have shown that Manduca sexta exhibits innate olfactory preferences for floral volatiles that precisely match its proboscis length, optimising net energy gain during flight. This hardwired scent detection aligns with the physical architecture of matching flowers, providing empirical support for classic coevolutionary hypotheses and demonstrating how fixed olfactory biases can shape plant–pollinator mutualisms.

Sensory Ecology of Flower-Visiting Insects publication trend

The graph below shows the total number of articles in sensory ecology of flower-visiting insects across all publications each year (not limited to Nature Index journals).

Technical terms

Sensory ecology: The study of how organisms acquire, process and respond to environmental information through their sensory systems.

Floral volatiles: Organic compounds emitted by flowers that convey olfactory information to pollinators.

Mechanoreceptors: Sensory cells or structures that detect mechanical stimuli such as touch, pressure or vibration.

Proboscis: A specialised, tubular mouthpart in insects used to probe and ingest nectar.

Nectar guides: Visual or tactile floral markings that direct pollinators to the nectar source.

Hygrosensation: The ability to detect moisture gradients, often used by insects to locate nectar or assess floral humidity cues.

References

1. Innate olfactory preferences for flowers matching proboscis length ensure optimal energy gain in a hawkmoth. Nature Communications (2016).
2. Hawkmoths evaluate scenting flowers with the tip of their proboscis. eLife (2016).
3. Tactile active sensing in an insect plant pollinator. Journal of Experimental Biology (2021).
4. Fuelling on the wing: sensory ecology of hawkmoth foraging. Journal of Comparative Physiology A (2019).