Genetic Dynamics in Biological Control Agents
Summary
Biological control relies on the deliberate use of living organisms to manage pest populations, and the genetic constitution of these agents is a key determinant of success. When a control agent is introduced into a new environment, demographic and evolutionary processes—such as genetic drift, selection, population bottlenecks and admixture—interact to shape its adaptive potential. Small founding populations often suffer reductions in heterozygosity and allelic richness, which can impair performance under field conditions. Conversely, deliberate or incidental hybridisation among distinct source populations can restore genetic variation and generate hybrid vigour, enhancing resilience to environmental heterogeneity. Mass-rearing practices designed for commercial augmentation may impose laboratory-based selection pressures, leading to traits that are maladaptive outside rearing facilities. Advances in molecular tools now allow genome-scale surveys of single nucleotide polymorphisms and other markers to reconstruct introduction pathways, detect signals of adaptive evolution and inform the selection of strains with optimal traits. Incorporating genetic monitoring into biological control programmes not only improves agent efficacy but also helps to anticipate non-target effects, guide regulatory approval and foster sustainable pest management under changing climates and agroecosystems.
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Genetic Dynamics in Biological Control Agents publication trend
The graph below shows the total number of articles in genetic dynamics in biological control agents across all publications each year (not limited to Nature Index journals).
Technical terms
Genetic drift: Random changes in allele frequencies within small populations, often leading to reduced genetic diversity.
Bottleneck: A severe reduction in population size that diminishes genetic variation and increases the effects of drift.
Admixture: The mixing of gene pools from previously isolated populations, which can restore diversity and create novel trait combinations.
Population genomics: The analysis of genome-wide variation across many individuals to infer demographic events and selective pressures.
Allelic richness: The number of different alleles present in a population, serving as an indicator of its genetic diversity.
References
- The biology of small, introduced populations, with special reference to biological control. Evolutionary Applications (2012).
- Insights from Population Genomics to Enhance and Sustain Biological Control of Insect Pests. Insects (2020).
- Into the weeds: Matching importation history to genetic consequences and pathways in two widely used biological control agents. Evolutionary Applications (2019).
- Effect of mass rearing on the genetic diversity of the predatory mite Amblyseius swirskii. Entomologia Experimentalis et Applicata (2019).
- Genomic changes in the biological control agent Cryptolaemus montrouzieri associated with introduction. Evolutionary Applications (2019).
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