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

Andrianoelina, Olivarimbola; Favreau, Bénédicte; Ramamonjisoa, Lolona; Bouvet, Jean‐Marc

doi:10.1093/aob/mcp231

Cited by 34 publications

(40 citation statements)

References 51 publications

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“…Human disturbances through selective harvesting or complete clearance act on population by generally reducing densities and size and this can potentially purge important rare allele within the populations. The present results concur with those found by Andrianoelina et al (2009) on Dalbergia monticola. The moderate differences reported in this study could also mean that the human disturbances in this ecosystem are recent and has not shown strong impact.…”

Section: Genetic Diversitysupporting

confidence: 94%

“…The failure to detect population bottlenecks may probably be because the power to detect bottlenecks is often low when the decline is not instantaneous or when not many generations have passed since the disturbance (Dixo et al 2009). Andrianoelina et al (2009) also failed to detect bottlenecks with D. monticola populations in fragmented oriental forests of Madagascar. Our results provide evidence that the currently observed human disturbance and fragmentation have not yet revealed a population genetic signature in the ecosystem (Dixo et al 2009).…”

Section: Population Bottleneckmentioning

confidence: 94%

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Genetic consequences of anthropogenic disturbances and population fragmentation in Acacia senegal

et al. 2016

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Acacia senegal is endemic to dry forest and woodland ecosystems of Sub-Saharan Africa and provides both ecological and socio-economic benefits. However, these ecosystems are threatened by escalating human disturbances and fragmentation. To investigate the human impacts on genetic diversity and structure of A. senegal, we studied genetic variability and differentiation of 330 individual trees from 11 natural A. senegal populations, grouped into lightly and heavily disturbed, using 12 polymorphic nuclear microsatellite markers. Gene diversity (H E ) ranged from H E = 0.570 to H E = 0.632. Significant differences (P \ 0.05) between the levels of disturbances are reported for mean gene diversity, number of alleles and allelic richness with lightly disturbed populations showing higher values. Overall, the indirect estimates of average outcrossing rates ranged from 0.794 (Kiserian) to 0.999 (Kampi ya Moto) with a mean of 0.997 suggesting a predominantly outcrossing species. There was no significant relationship (P [ 0.05) detected between genetic and geographic distances, showing lack of isolation by distance. Analysis of population structure using unweighted pair group method with arithmetic mean and Bayesian model suggests presence of three gene pools as most probable, although most individuals showed mixed ancestry. The diversity and genetic structure reported in this study revealed negative impacts of human disturbance on A. senegal within this ecosystem. We recommend in-situ conservation strategies to safeguard the woodland ecosystem from further deforestation.

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Section: Genetic Diversitysupporting

confidence: 94%

Section: Population Bottleneckmentioning

confidence: 94%

Genetic consequences of anthropogenic disturbances and population fragmentation in Acacia senegal

et al. 2016

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“…Such results were achieved previously in a number of studies of rare and endangered species, including Acacia anomala (Coates, 1988), Swietenia humilis (White et al, 1999), Swietenia macrophylla (Lemes et al, 2003), Magnolia stellata (Setsuko et al, 2007), Prunus africana (Farwig et al, 2008), Dalbergia monticola (Andrianoelina et al, 2009) and Shorea robusta (Pandey and Geburek, 2010). On the other hand, low genetic diversity and high genetic differentiation among populations had been detected in Eugenia dysenterica (Zucchi et al, 2003), Caesalpinia echinata (Cardoso et al, 1998), Glyptostrobus pensilis (Li et al, 2005), Vitellaria paradoxa (Sanou et al, 2005).…”

Section: Discussionsupporting

confidence: 72%

Genetic diversity and differentiation of an endangered tree species, Afzelia xylocarpa (Kurz) craib in Thailand revealed by nuclear microsatellite markers

Pakkad¹,

Kanetani²,

Elliott³

2014

Afr. J. Biotechnol.

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Afzelia xylocarpa is listed as an endangered species on the IUCN World list of Threatened Trees, due to over exploitation for its valuable timber and habitat loss, have resulted in a rapid decline of populations size and local population extinction. Understanding of the processes that determine population genetic structure, gene flow and mating systems is important to conserve and manage the existing populations for this endangered tree species. This study describes the level of genetic diversity and differentiation of fifteen populations of A. xylocarpa in Thailand. Genetic variations at seven nuclear microsatellite loci were examined. The seven nuclear microsatellite loci employed detected a total of 53 alleles (n=432). The nSSRs data indicate that a high level of genetic diversity (H S = 0.575) and low level of genetic differentiation among the 15 examined A. xylocarpa populations. The observed level of genetic differentiation among the 15 populations was low, as revealed by F ST = 0.074 and G ST = 0.078. The results for the nSSRs suggested that all of the populations in North Eastern, Central Thailand and the Klong Lan populations harbored the high genetic diversity and less divergent from the other populations. Therefore, these populations should be assigned the highest priority for conservation of this species.

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“…Collevatti et al 2001;Novick et al 2003;Andrianoelina et al 2009). The Bayesian approach showed distinct separation among three regional groups: the eastern group, the central group and the western group (Fig.…”

Section: Genetic Differentiation In Wild Litchi Populationsmentioning

confidence: 99%

Genetic variation of wild litchi (Litchi chinensis Sonn. subsp. chinensis) revealed by microsatellites

et al. 2011

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Understanding the amount and distribution of genetic diversity in natural populations can inform the conservation strategy for the species in question. In this study, genetic variation at eight nuclear microsatellite loci was used to investigate genetic diversity and population structure of wild litchi (Litchi chinensis Sonn. subsp. chinensis). Totally 215 individuals were sampled, representing nine populations of wild litchi. All eight loci were polymorphic, with a total of 51 alleles. The expected heterozygosity in the nine populations ranged from 0.367 to 0.638 with an average value of 0.526. Inbreeding within wild litchi populations was indicated by a strong heterozygote defect. Significant bottleneck events were detected in the populations from Yunnan and Vietnam, which could be responsible for lower levels of genetic diversity in these populations. Measures of genetic differentiation (F ST = 0.269) indicated strong differentiation among wild litchi populations. Significant correlation was found between genetic differentiation and geographical distance (r = 0.655, P = 0.002), indicating a strong isolation by distance in these populations. Bayesian clustering suggested genetic separation among three regional groups, namely, the western group, the central group and the eastern group. Some conservation strategies for wild litchi populations were also proposed based on our results.

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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

Abstract: Residual diversity and genetic structure of populations of D. monticola in Madagascar suggest a limited impact of fragmentation on molecular genetic parameters.

Cited by 34 publications

References 51 publications

Genetic consequences of anthropogenic disturbances and population fragmentation in Acacia senegal

Genetic consequences of anthropogenic disturbances and population fragmentation in Acacia senegal

Genetic diversity and differentiation of an endangered tree species, Afzelia xylocarpa (Kurz) craib in Thailand revealed by nuclear microsatellite markers

Genetic variation of wild litchi (Litchi chinensis Sonn. subsp. chinensis) revealed by microsatellites

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