Population Genetics and Conservation of Invasive Species

Population genetics provides the conceptual and methodological framework for understanding how invasive species establish, spread and adapt in novel environments. By analysing the distribution of genetic variation within and among invasive populations, researchers can reconstruct introduction pathways, estimate propagule pressure and detect founder effects or genetic bottlenecks. Insights into genetic admixture and effective population size inform management units and biosecurity measures, guiding eradication or containment strategies. Studies of model invaders such as raccoons have illustrated how multiple introductions and subsequent hybridisation can enhance adaptive potential, while emerging genomic tools—including mitochondrial sequencing, nuclear microsatellites and single-nucleotide polymorphism panels—permit fine-scale resolution of source populations and demographic history. Integrating these findings with ecological data supports evidence-based decision making, enabling conservation practitioners to anticipate evolutionary trajectories, assess invasion risk and design targeted interventions across diverse biogeographical contexts.

Research from Nature Portfolio

Recent studies have applied combined nuclear and mitochondrial analyses to elucidate invasion dynamics and refine management strategies. In one investigation, forensic genetic methods traced the source of an emerging raccoon population in Italy to escaped zoo animals, updated global haplotype networks and underscored the importance of captive–wild interfaces. Work in Japan’s Boso Peninsula delineated at least three independent introductions of raccoons, identified genetic admixture among management units and demonstrated that ongoing genetic monitoring during control operations is essential to detect secondary invasions. Another study on Hokkaido raccoons revealed unexpectedly high genetic diversity comparable to native ranges, low differentiation among geographically separated populations and complex admixture patterns driven by pet escape events, highlighting the role of anthropogenic releases in shaping invasive population structure.

Population Genetics and Conservation of Invasive Species publication trend

The graph below shows the total number of articles in population genetics and conservation of invasive species across all publications each year (not limited to Nature Index journals).

Technical terms

Microsatellite markers: Short, tandemly repeated DNA sequences highly variable among individuals, used to assess genetic diversity and population structure.

Mitochondrial DNA haplotype: A set of mitochondrial DNA variants inherited as a unit, used to trace maternal lineages and historical dispersal.

Genetic admixture: The mixing of distinct genetic lineages following secondary contact or multiple introductions, which can increase adaptive potential.

Founder event: The establishment of a new population by a small number of individuals, often leading to reduced genetic diversity.

Genetic bottleneck: A sharp reduction in population size that reduces genetic variation and can alter allele frequencies.

Effective population size: The number of breeding individuals in a population that contribute genes to subsequent generations, influencing genetic drift.

References

1. A forensic genetic investigation reveals a captive origin for a wild alien population of raccoons in Italy. Scientific Reports (2024).
2. Microsatellite profiling of hosts from parasite-extracted DNA illustrated with raccoons (Procyon lotor) and their Baylisascaris procyonis roundworms. Parasites & Vectors (2023).
3. Historical Invasion Records Can Be Misleading: Genetic Evidence for Multiple Introductions of Invasive Raccoons (Procyon lotor) in Germany. PLOS ONE (2015).
4. Microsatellites and mitochondrial evidence of multiple introductions of the invasive raccoon Procyon lotor in France. Biological Invasions (2023).
5. Genetic population structure of invasive raccoons (Procyon lotor) in Hokkaido, Japan: Unique phenomenon caused by pet escape or abandonment. Scientific Reports (2020).
6. Population genetic structure of raccoons as a consequence of multiple introductions and range expansion in the Boso Peninsula, Japan. Scientific Reports (2021).