Genetic Diversity and Mating Systems in Fragmented Plant Populations
Summary
Habitat fragmentation disrupts the continuity of plant populations, leading to reduced gene flow, increased genetic drift and elevated inbreeding. These processes alter mating systems by shifting the balance between self-fertilisation and cross-fertilisation, reshaping spatial genetic structure and affecting reproductive success. In small, isolated remnants, limited pollen and seed dispersal can produce fine-scale kin structure, reducing allelic richness and heterozygosity, and heightening extinction risk. Conversely, some taxa exhibit compensatory ecological or evolutionary responses such as increased outcrossing or altered pollinator behaviour, which may buffer diversity loss. Understanding these dynamics is essential for designing conservation interventions—ranging from seed sourcing and assisted gene flow to the restoration of connectivity—that maintain adaptive potential and ecosystem resilience under global change.
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Genetic Diversity and Mating Systems in Fragmented Plant Populations publication trend
The graph below shows the total number of articles in genetic diversity and mating systems in fragmented plant populations across all publications each year (not limited to Nature Index journals).
Technical terms
Genetic diversity: The variety of alleles and genotypes within a population that underpins adaptive potential.
Mating system: The pattern of mating (self-fertilisation versus outcrossing) that shapes genetic structure and inbreeding levels.
Fragmentation: The breaking of continuous habitat into isolated patches that restrict gene flow.
Outcrossing rate: The proportion of progeny arising from fertilisation by pollen from different individuals.
Spatial genetic structure: The non-random distribution of genotypes across a landscape, often reflecting limited dispersal.
Effective population size: The number of individuals contributing genes to the next generation, determining the strength of genetic drift.
References
- Genetic data and climate niche suitability models highlight the vulnerability of a functionally important plant species from south‐eastern Australia. Evolutionary Applications (2020).
- Optimising the conservation of genetic diversity of the last remaining population of a critically endangered shrub. AoB Plants (2021).
- Reproductive biology and population structure of the endangered shrub Grevillea bedggoodiana (Proteaceae). Conservation Genetics (2022).
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