ArticleAnnals of botany2009
Small effect of fragmentation on the genetic diversity of Dalbergia monticola, an endangered tree species of the eastern forest of Madagascar, detected by chloroplast and nuclear microsatellites.
Article in Annals of botany, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 38 citations in OpenAlex.
- A DNA barcode reference library for CITES listed MalagasyEcology and evolution · 2023Article
- How ancient forest fragmentation and riparian connectivity generate high levels of genetic diversity in a microendemic Malagasy tree.Molecular ecology · 2023Article
- Drivers of population divergence and species differentiation in a recent group of indigenous orchids (Ecology and evolution · 2021Article
- Molecular markers from the chloroplast genome of rose provide a complementary tool for variety discrimination and profiling.Scientific reports · 2020Article
- Population genetic structure of the endemic rosewoodsEcology and evolution · 2018Article
- Genetic structure and diversity of natural and domesticated populations of Citrus medica L. in the Eastern Himalayan region of Northeast India.Ecology and evolution · 2016Article
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- Habitat loss other than fragmentation per se decreased nuclear and chloroplast genetic diversity in a monoecious tree.PloS one · 2012Article
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
aimsThe oriental forest ecosystem in Madagascar has been seriously impacted by fragmentation. The pattern of genetic diversity was analysed on a tree species, Dalbergia monticola, which plays an important economic role in Madagascar and is one of the many endangered tree species in the eastern forest.
methodsLeaves from 546 individuals belonging to 18 small populations affected by different levels of fragmentation were genotyped using eight nuclear (nuc) and three chloroplast (cp) microsatellite markers. KEY
resultsFor nuclear microsatellites, allelic richness (R) and heterozygosity (H(e,nuc)) differed between types of forest: R = 7.36 and R = 9.55, H(e,nuc) = 0.64 and H(e,nuc) = 0.80 in fragmented and non-fragmented forest, respectively, but the differences were not significant. Only the mean number of alleles (N(a,nuc)) and the fixation index F(IS) differed significantly: N(a,nuc) = 9.41 and N(a,nuc) = 13.18, F(IS) = 0.06 and F(IS) = 0.15 in fragmented and non-fragmented forests, respectively. For chloroplast microsatellites, estimated genetic diversity was higher in non-fragmented forest, but the difference was not significant. No recent bottleneck effect was detected for either population. Overall differentiation was low for nuclear microsatellites (F(ST,nuc) = 0.08) and moderate for chloroplast microsatellites (F(ST,cp) = 0.49). A clear relationship was observed between genetic and geographic distance (r = 0.42 P < 0.01 and r = 0.42 P = 0.03 for nuclear and chloroplast microsatellites, respectively), suggesting a pattern of isolation by distance. Analysis of population structure using the neighbor-joining method or Bayesian models separated southern populations from central and northern populations with nuclear microsatellites, and grouped the population according to regions with chloroplast microsatellites, but did not separate the fragmented populations.
conclusionsResidual diversity and genetic structure of populations of D. monticola in Madagascar suggest a limited impact of fragmentation on molecular genetic parameters.
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