Genetic Diversity and Population Structure in Aphid Species

Aphid populations exhibit a complex interplay of genetic variation and spatial organisation shaped by reproductive mode, dispersal ability and environmental factors. Genetic diversity in aphids ranges from low levels in widespread clonal lineages to moderate variation in cyclical parthenogens that undergo sexual reproduction. Tools such as mitochondrial DNA sequencing, nuclear microsatellite markers and genome-wide single nucleotide polymorphism analysis have revealed patterns of haplotype distribution, gene flow and demographic history across geographic regions and host plants. Population structure often reflects a balance between long-distance dispersal—mediated by wind currents and human transport—and local adaptation to climate, crop phenology or insecticide regimes. In many cereal pests, a small number of superclones dominate vast areas, while other species maintain distinct genetic clusters corresponding to north–south or east–west divisions. Understanding these patterns is essential for predicting outbreak dynamics, managing resistance evolution and designing targeted biocontrol strategies that exploit the vulnerabilities of both sexual and asexual aphid lineages.

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Genetic Diversity and Population Structure in Aphid Species publication trend

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

Technical terms

Genetic diversity: The total number of genetic characteristics in the genetic makeup of a species, reflecting variation among individuals and populations.

Population structure: The organisation of genetic variation within and among populations, often shaped by gene flow, drift and selection.

Microsatellite markers (SSR): Short, tandemly repeated DNA sequences used to assess genetic variation and relatedness.

Mitochondrial DNA: Genetic material from the cell’s mitochondria often used for phylogeographic and maternal lineage studies.

Haplotype network: A graphical representation of relationships among DNA sequences, illustrating mutational steps between variants.

Parthenogenesis: A form of asexual reproduction in which females produce offspring without fertilisation, which can be cyclical or obligate.

Gene flow: The movement and exchange of genes between populations through dispersal of individuals or gametes.

Single nucleotide polymorphism (SNP): A variation at a single base-pair position in the genome used for high-resolution population genetic studies.

References

1. Analysis of the Genetic Diversity of Two Rhopalosiphum Species from China and Europe Based on Nuclear and Mitochondrial Genes. Insects (2023).
2. Self and non-self recognition affects clonal reproduction and competition in the pea aphid. Proceedings of the Royal Society B (2021).
3. Latitudinal trend in the reproductive mode of the pea aphid Acyrthosiphon pisum invading a wide climatic range. Ecology and Evolution (2020).