Testing the hypothesis of low genetic diversity and population structure in narrow endemic species: the endangered Antirrhinum charidemi (Plantaginaceae)
FORREST, Alan
Department of Biodiversity and Conservation, Real Jardín Botánico
Centre for Middle Eastern Plants
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Department of Biodiversity and Conservation, Real Jardín Botánico
Centre for Middle Eastern Plants
FORREST, Alan
Department of Biodiversity and Conservation, Real Jardín Botánico
Centre for Middle Eastern Plants
< Reduce
Department of Biodiversity and Conservation, Real Jardín Botánico
Centre for Middle Eastern Plants
Language
en
Article de revue
This item was published in
Botanical Journal of the Linnean Society. 2017, vol. 183, n° 2, p. 260-270
Linnean Society of London
English Abstract
Narrow endemics have historically been hypothesized to have low levels of genetic diversity. However, recent research has shown an opposite pattern in numerous plants. Antirrhinum charidemi is a narrow range endemic, ...Read more >
Narrow endemics have historically been hypothesized to have low levels of genetic diversity. However, recent research has shown an opposite pattern in numerous plants. Antirrhinum charidemi is a narrow range endemic, critically endangered snapdragon from south-eastern Spain. The genetic diversity and its distribution are described based on eight sampling sites across its range (10 × 4 km) using plastid DNA haplotypes, amplified fragment length polymorphism (AFLP) markers, and nuclear simple sequence repeats (SSRs). Plastid diversity was high, with seven haplotypes (h = 0.58), and differentiation among populations was strong and significant (GST = 0.470). Nuclear genetic diversity was also medium to high; for SSRs, there were four to 15 alleles per locus and Ht = 0.48, and for AFLP 90% of loci were polymorphic and Ht = 0.243. The genetic structure was weak but significant (FST = 0.095 for SSRs, 0.096 for AFLP) although Bayesian analysis could not detect more than a single gene pool with any confidence. Antirrhinum charidemi therefore displays medium to high levels of genetic diversity despite its narrow distribution and endemicity. A survey of levels of genetic diversity in narrow endemic angiosperms gave congruent results and revealed a different view than the traditional hypothesis in population genetics. Indeed, narrow endemics do not necessarily harbour low levels of genetic diversity, which appears to depend strongly on multiple factors, particularly the evolutionary history of the populations.Read less <
Keywords
antirrhinum
espèce endémique
conservation génétique
marqueur nucléaire
diversité génétique
espagne
English Keywords
Antirrhinum charidemi
AFLP
conservation genetics
DNA
endemic
nuclear SSRs
Plantaginaceae
plastid
endemic species
maintenance breeding
genêtic variation
Origin
Hal imported