Genetic Diversity and Population Structure in Neotropical Inselberg Flora
Summary
Neotropical inselbergs—isolated rock outcrops rising from surrounding lowlands—harbour unique plant assemblages that function as terrestrial “islands” in the landscape. The extreme ecological isolation and heterogeneous microhabitats of these granitic and quartzitic outcrops have fostered high levels of endemism and genetic differentiation. Studies reveal that populations on individual inselbergs often exhibit pronounced genetic divergence driven by limited seed and pollen dispersal, strong genetic drift and historical isolation during climatic fluctuations. Molecular surveys using nuclear microsatellites and chloroplast DNA markers have uncovered deep phylogeographical structure, with each outcrop frequently supporting genetically distinct lineages. Species distribution modelling coupled with genetic data has further pinpointed glacial refugia and revealed that connectivity corridors shifted little throughout Quaternary cycles, underscoring long-term persistence. These insights not only clarify the mechanisms of speciation and diversification in Neotropical rock-outcrop systems but also inform conservation strategies aimed at preserving the genetic singularity of each inselberg population.
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Genetic Diversity and Population Structure in Neotropical Inselberg Flora publication trend
The graph below shows the total number of articles in genetic diversity and population structure in neotropical inselberg flora across all publications each year (not limited to Nature Index journals).
Technical terms
Microsatellite markers: Short tandem repeat sequences in the genome used to assess genetic variation among individuals and populations.
FST: A statistic measuring the proportion of genetic variation that is partitioned among populations, indicating the degree of differentiation.
Haplotype: A set of DNA sequence variants inherited together on a single chromosome region, used to trace maternal lineages.
Species distribution model: A computational tool that predicts the geographic range of a species based on environmental variables and occurrence data.
Genetic drift: Random fluctuations in allele frequencies within a population, especially pronounced in small or isolated groups.
Gene flow: The movement of genes or alleles between populations via seed or pollen dispersal, counteracting divergence.
References
- Do plant populations on distinct inselbergs talk to each other? A case study of genetic connectivity of a bromeliad species in an Ocbil landscape. Ecology and Evolution (2017).
- Rock outcrop orchids reveal the genetic connectivity and diversity of inselbergs of northeastern Brazil. BMC Ecology and Evolution (2014).
- Genetic Structure Is Associated with Phenotypic Divergence in Floral Traits and Reproductive Investment in a High-Altitude Orchid from the Iron Quadrangle, Southeastern Brazil. PLOS ONE (2015).
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