Genetic Diversity and Species Interactions in Ecological Communities

Genetic diversity and species interactions are intertwined drivers of ecological complexity and stability. Genetic variation within populations underpins adaptive potential, allowing species to respond to environmental change and maintain demographic viability. At the community level, the diversity of interacting species—from mutualists and competitors to predators and pathogens—shapes selection pressures that in turn influence genetic structure. The concept of the species-genetic diversity correlation (SGDC) captures the covariation between genetic diversity within focal taxa and species diversity across the community, reflecting shared responses to landscape configuration, dispersal processes and ecological filtering. Partitioning this covariation into α and β components reveals how local habitat quality, connectivity and species turnover jointly determine patterns of allelic richness and species composition across spatial scales. Empirical findings now demonstrate that both neutral processes, such as drift and dispersal limitation, and adaptive processes, such as niche differentiation and selection in multispecies networks, contribute to emerging biodiversity patterns. Understanding these feedbacks is essential for conservation planning, as declines in genetic diversity can weaken ecosystem functions mediated by species interactions, while species losses can curtail opportunities for adaptive gene flow. Advances in high-throughput sequencing and community phylogenetics are further illuminating the role of historical climate stability and landscape change in shaping the congruence between genetic and species diversity, offering new strategies to sustain both in the face of global change.

Research from Nature Portfolio

Recent studies have shown that soil characteristics within tropical forests can decouple genetic and species diversity. Investigations in seasonal rainforest plots revealed a negative correlation between tree species richness and the genetic diversity of a focal canopy species, mediated by variation in soil pH and nutrient availability. Structural equation analyses indicated that richer soils promote species coexistence but reduce niche breadth or effective population sizes of dominant species, driving down allelic richness. This work highlights how soil variation can modulate the interplay between community assembly and intraspecific genetic variation, with implications for forest genetic conservation under environmental change.

Genetic Diversity and Species Interactions in Ecological Communities publication trend

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

Technical terms

Genetic diversity: The variety of alleles and genotypes within and among populations.
Species-genetic diversity correlation (SGDC): The relationship between species richness or composition and genetic diversity in focal taxa.
Functional connectivity: The degree to which the landscape facilitates movement and gene flow among populations.
β-diversity: The turnover of species or genetic composition between sites or communities.
Species abundance distribution (SAD): The ranked frequency distribution of species abundances within a community.
Allelic richness: A measure of the average number of alleles per locus, reflecting genetic variation normalised for sample size.

References

1. Spatial genetic differentiation correlates with species assemblage turnover across tropical reef fish lineages. Global Ecology and Biogeography (2023).
2. Climatic stability predicts the congruence between species abundance and genetic diversity. Ecography (2024).
3. Species-specific erosion of genetic diversity in grassland butterflies depends on landscape land cover. Biological Conservation (2024).
4. Soil properties drive a negative correlation between species diversity and genetic diversity in a tropical seasonal rainforest. Scientific Reports (2016).
5. Partitioning genetic and species diversity refines our understanding of species–genetic diversity relationships. Ecology and Evolution (2018).