Population Genetics of Insular Species
Summary
Island environments offer a powerful natural laboratory for exploring how isolation shapes genetic diversity, evolutionary trajectories and species persistence. Restricted land area, discrete boundaries and variable colonisation histories combine to accentuate the roles of genetic drift, founder effects and inbreeding. At the same time, reduced gene flow from continental or neighbouring island populations can permit rapid local adaptation, leading to endemic lineages and ecotypes. Modern molecular tools – from mitochondrial markers to genome-wide SNP assays – have revealed fine-scale structure among island subpopulations, quantifying differentiation indices such as FST and identifying genomic regions under selection. Insights into colonisation routes, demographic bottlenecks and historical connectivity illuminate how sea-level change, habitat fragmentation and human introductions have influenced insular gene pools. Understanding these processes is critical for conservation planning, as many island endemics face elevated extinction risk due to small effective population sizes and limited dispersal. Integrating population genomic data with ecological and biogeographical models continues to refine our picture of how isolation, selection and stochasticity interact to generate and maintain biodiversity on islands worldwide.
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Population Genetics of Insular Species publication trend
The graph below shows the total number of articles in population genetics of insular species across all publications each year (not limited to Nature Index journals).
Technical terms
Founder effect: Reduction in genetic diversity when a new population is established by a small number of individuals.
Genetic drift: Random fluctuations in allele frequencies, with stronger effects in small populations.
FST: A measure of genetic differentiation among populations, ranging from zero (no differentiation) to one (complete separation).
Gene flow: Movement of alleles between populations, counteracting divergence and maintaining genetic connectivity.
Microsatellites: Short, tandemly repeated DNA sequences used as highly polymorphic markers for population studies.
SNP (Single-nucleotide polymorphism): Variation at a single base pair in the genome, enabling dense genotyping across populations.
References
- The population genetics of nonmigratory Allen’s Hummingbird (Selasphorus sasin sedentarius) following a recent mainland colonization. Ecology and Evolution (2021).
- A New Record of Pinctada fucata (Bivalvia: Pterioida: Pteriidae) in Mischief Reef: A Potential Invasive Species in the Nansha Islands, China. Diversity (2023).
- Highly divergent mussel lineages in isolated Indonesian marine lakes. PeerJ (2016).
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