Ecological Interactions of Invasive Ladybird Beetles

Invasive ladybird beetles have emerged as pivotal agents reshaping arthropod communities across diverse ecosystems. Originally introduced for aphid biocontrol, species such as Harmonia axyridis and Coccinella septempunctata have established extensive populations beyond their native ranges. Their success derives from a combination of high reproductive output, broad dietary breadth and phenotypic plasticity, enabling them to exploit variable prey densities and habitats. Interactions with native ladybirds manifest through direct competition for resources and intraguild predation, whereby invasive individuals consume eggs or larvae of co-occurring species. Environmental factors, notably landscape structure and climatic warming, further modulate dispersal dynamics and competitive outcomes. Collectively, these processes drive shifts in community composition, often resulting in reduced diversity of native coccinellids, altered prey suppression services and novel trophic linkages with indigenous predators and parasitoids.

Research from Nature Portfolio

Recent studies have interrogated behavioural and physiological mechanisms underpinning invasive success. Experiments comparing olfactory and reproductive responses of an invasive species and a native congener revealed that the invader exhibits stronger attraction to plant-aphid volatiles and greater flexibility in egg production under prey limitation. Such responsiveness to chemical cues enables rapid habitat exploitation and reproductive readiness, conferring a competitive edge over resident species. These findings illuminate how sensory ecology and life-history plasticity interact to promote establishment and dominance in novel environments.

Ecological Interactions of Invasive Ladybird Beetles publication trend

The graph below shows the total number of articles in ecological interactions of invasive ladybird beetles across all publications each year (not limited to Nature Index journals).

Technical terms

Invasive species: Organisms introduced beyond their native range that establish, spread and impact recipient ecosystems.

Aphidophagous: Feeding primarily on aphids, a key trait for biological control agents among ladybird beetles.

Intraguild predation: Predators consuming other predator species with which they compete for shared prey.

Niche partitioning: Segregation of habitat or temporal resource use that reduces direct competition among coexisting species.

Synomones: Plant-emitted chemicals induced by herbivore attack that attract natural enemies of the herbivore.

References

1. Landscape change and alien invasions drive shifts in native lady beetle communities over a century. Ecological Applications (2024).
2. Coexistence between similar invaders: The case of two cosmopolitan exotic insects. Ecology (2023).
3. From effective biocontrol agent to successful invader: the harlequin ladybird (Harmonia axyridis) as an example of good ideas that could go wrong. PeerJ (2017).
4. Intraguild Predation and Native Lady Beetle Decline. PLOS ONE (2011).
5. Behavioural and physiological responses to prey-related cues reflect higher competitiveness of invasive vs. native ladybirds. Scientific Reports (2017).
6. Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas. Biological Invasions (2017).