Genetic Diversity and Population Connectivity in Fragmented Ecosystems
Summary
Habitat fragmentation driven by urban expansion, agricultural intensification and infrastructure development divides once‐continuous ecosystems into smaller and more isolated patches. This process alters the balance between genetic drift, inbreeding and gene flow, often leading to reduced genetic diversity and increased differentiation among populations. Genetic diversity underpins the capacity of species to adapt to environmental change, resist emerging diseases and maintain ecosystem functions. Population connectivity—defined by the movement of individuals or gametes among habitat fragments—can mitigate the negative genetic consequences of isolation, but its efficacy depends on life‐history traits, landscape features and historical land‐use legacies. Contemporary studies employ high‐throughput sequencing, landscape genetics and meta‐analytical approaches to quantify neutral and adaptive variation, identify dispersal corridors and predict demographic viability. The global significance of these findings extends to tropical forests, temperate grasslands and island‐like habitats, informing reserve design, restoration planning and the management of genetic rescue operations. By integrating empirical data with spatial modelling, researchers are now better equipped to recommend concrete conservation measures—such as stepped stone networks, buffer zones and assisted migration—to maintain adaptive potential in a rapidly changing world.
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Genetic Diversity and Population Connectivity in Fragmented Ecosystems publication trend
The graph below shows the total number of articles in genetic diversity and population connectivity in fragmented ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Genetic diversity: the range of alleles and genotypes within and among populations, reflecting adaptive potential and evolutionary resilience.
Population connectivity: the degree to which gene flow occurs between spatially separated populations via dispersal of individuals or gametes.
Gene flow: the movement of genetic material between populations, counteracting genetic drift and reducing differentiation.
Isolation by distance: a pattern where genetic divergence increases with geographic separation due to limited dispersal.
Landscape resistance: a measure of how landscape features impede or facilitate movement and gene flow among habitat patches.
References
- Beware of the impact of land use legacy on genetic connectivity: A case study of the long-lived perennial Primula veris. Biological Conservation (2024).
- Genetic effects of anthropogenic habitat fragmentation on remnant animal and plant populations: a meta‐analysis. Ecosphere (2018).
- Habitat Loss Does Not Always Entail Negative Genetic Consequences. Frontiers in Genetics (2019).
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