Genetic Diversity and Population Structure of Wild Boar Ecosystems

Wild boar (Sus scrofa) exhibit remarkable genetic diversity shaped by Pleistocene glacial cycles, post-glacial recolonisation and ongoing anthropogenic influences. Contemporary populations span Europe, Asia and introduced regions, displaying genetic signatures that reflect historical refugia and migrations as well as recent habitat fragmentation, hybridisation with domestic pigs and human-mediated translocations. Genome-wide analyses using microsatellites and SNP arrays have delineated distinct genetic clusters at regional and continental scales, revealing barriers to gene flow imposed by geographic features such as mountain ranges and plains. Effective population sizes vary widely among populations, with isolated or bottlenecked groups showing reduced diversity. Inter- and intra-specific admixture events, including introgression from domestic pigs and related suid species, have further altered population structure, raising conservation and management considerations. Understanding these patterns is crucial for designing strategies that preserve genetic integrity, manage disease spread and mitigate human–wildlife conflict.

Research from Nature Portfolio

Recent studies have employed fine-scale phylogeographic and genomic approaches to resolve the genetic architecture of wild boar populations. A large-scale microsatellite survey in Japan identified 15 genetic clusters confined within approximately 200 km, highlighting isolation by distance and pinpointing geographic barriers such as plains and mountain ranges that limit gene flow. Evidence of long-distance anthropogenic introductions was inferred from genetically similar subpopulations separated by 900 km. In addition, genome-wide sequencing of pygmy hogs revealed that as wild boar expanded across Eurasia, they interbred with extant suid lineages, illustrating how inter-specific admixture facilitated rapid range expansion and influenced genetic diversity of both wild boar and sympatric species.

Genetic Diversity and Population Structure of Wild Boar Ecosystems publication trend

The graph below shows the total number of articles in genetic diversity and population structure of wild boar ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Genetic diversity: The variety of genetic characteristics within and between populations, often measured by allele richness and heterozygosity.

Population structure: The non-random distribution of genetic variation among populations, shaped by historical, geographic and demographic factors.

Single nucleotide polymorphism (SNP): A variation at a single base pair in the genome, used as a genetic marker for population and evolutionary studies.

Microsatellite marker: A short, tandemly repeated DNA sequence used to assess genetic variation and infer population structure and relatedness.

Admixture: The mixing of distinct genetic lineages through interbreeding, resulting in populations with shared ancestry from multiple sources.

References

1. Assessing population structure and migration patterns of wild boar (Sus scrofa) in Japan. Scientific Reports (2023).
2. Genomic analysis on pygmy hog reveals extensive interbreeding during wild boar expansion. Nature Communications (2019).
3. Spatial genetic structure of European wild boar, with inferences on late-Pleistocene and Holocene demographic history. Heredity (2023).
4. Contemporary Genetic Structure, Phylogeography and Past Demographic Processes of Wild Boar Sus scrofa Population in Central and Eastern Europe. PLOS ONE (2014).
5. Reintroductions and genetic introgression from domestic pigs have shaped the genetic population structure of Northwest European wild boar. BMC Genomic Data (2013).