Carabid Beetle Ecology in Agricultural Systems

Carabid beetles are a diverse group of ground‐dwelling insects that provide multiple ecosystem services in arable landscapes, most notably the regulation of invertebrate pests and the predation of weed seeds. Their effectiveness depends on species composition, seasonal activity and landscape structure, with heterogeneous habitats such as field margins and diversified crop architectures promoting both abundance and functional complementarity. In intensively managed systems, community composition can be simplified, reducing redundancy and destabilising seed‐predation functions. Conversely, practices that enhance microhabitat heterogeneity—such as unsown rows or retention of grassy margins—favour larger‐bodied and more specialised carabids, thereby boosting predation rates without yield penalties. At continental scales, the resilience of weed‐seedbank regulation has been demonstrated even in the face of varying alternative prey, emphasising the broad relevance of carabid‐mediated biocontrol. Integrating knowledge of trophic interactions and landscape connectivity is essential for designing sustainable management strategies that harness carabid biodiversity for crop protection and ecological intensification.

Research from Nature Portfolio

Recent continental‐scale assessments have confirmed that carabid activity–density is positively linked to seed predation on the soil surface, with omnivorous and granivorous species jointly contributing to weed‐seedbank regulation. Investigations across multiple cereal fields reveal that the per-capita consumption of weed seeds remains robust despite fluctuations in alternative prey biomass, underlining the resilience of this service. These findings highlight the capacity of carabid assemblages to maintain key ecosystem functions over large geographic gradients and variable trophic contexts.

Carabid Beetle Ecology in Agricultural Systems publication trend

The graph below shows the total number of articles in carabid beetle ecology in agricultural systems across all publications each year (not limited to Nature Index journals).

Technical terms

Functional redundancy: Coexistence of multiple species that perform similar ecological roles, buffering ecosystem functions against species loss.

Ecological intensification: Agricultural approaches that leverage biodiversity and natural processes to sustain or enhance yields while reducing external inputs.

Seedbank: The reservoir of viable seeds present in the soil, representing potential future weed populations.

Activity–density: A combined measure of organismal abundance and activity within a habitat, often gauged by trapping methods.

Granivorous: Feeding primarily on seeds.

Omnivorous: Feeding on both plant material and animal prey.

Trophic interactions: Feeding relationships among organisms that structure energy flow and nutrient cycling within ecosystems.

References

1. Functional redundancy of weed seed predation is reduced by intensified agriculture. Ecology Letters (2024).
2. Rows make the field: Winter wheat fields with manipulated crop architecture show potential for ecological intensification based on higher natural pest and weed seed control. Agriculture Ecosystems & Environment (2023).
3. Field margins enhance weed seed predation in adjacent fields in early spring. Frontiers in Agronomy (2023).
4. Consumer identity but not food availability affects carabid diet in cereal crops. Journal of Pest Science (2023).
5. Connected Carabids: Network Interactions and Their Impact on Biocontrol by Carabid Beetles. BioScience (2020).
6. The resilience of weed seedbank regulation by carabid beetles, at continental scales, to alternative prey. Scientific Reports (2020).