Genetic differences between continuous and disjunct populations: some insights from sal (Shorea robusta Roxb.) in Nepal

Pandey, Madhav; Geburek, Thomas

doi:10.1007/s10592-009-9940-y

Cited by 11 publications

(14 citation statements)

References 34 publications

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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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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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“…The mountainous topography of Mahé might further impede gene flow in V. seychellarum . The wind‐pollinated Shorea robusta in hilly regions in Nepal, showed higher levels of genetic differentiation among populations, naturally disjunct along river valleys, compared with larger continuous populations (Pandey & Geburek 2010). These examples indicate that habitat fragmentation may have similar genetic consequences for many dipterocarp species of different geographical regions as gene dispersal modes are often comparable.…”

Section: Discussionmentioning

confidence: 99%

Forest fragmentation genetics in a formerly widespread island endemic tree: Vateriopsis seychellarum (Dipterocarpaceae)

et al. 2012

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Habitat fragmentation and changed land use have seriously reduced population size in many tropical forest tree species. Formerly widespread species with limited gene flow may be particularly vulnerable to the negative genetic effects of forest fragmentation and small population size. Vateriopsis seychellarum (Dipterocarpaceae) is a formerly widespread canopy tree of the Seychelles, but is now reduced to 132 adult individuals distributed in eleven sites. Using ten microsatellite loci, a genetic inventory of all adult trees and a sample of 317 progeny, we demonstrate that despite its restricted range, overall genetic diversity was relatively high (H(E) : 0.56). The juvenile cohort, however, had significantly lower allelic richness (adults R(S) : 3.91; juveniles R(S) : 2.83) and observed heterozygosity than adult trees (adults H(O) : 0.62; juveniles H(O) : 0.48). Rare alleles were fewer and kinship between individuals was stronger in juveniles. Significant fine-scale spatial genetic structure was observed in remnant adults, and parentage analysis indicated that more than 90% of sampled progeny disperse <25 m and pollen dispersed <50 m. The molecular data confirmed that two populations were derived entirely from self-fertilized offspring from a single surviving mother tree. These populations produce viable offspring. Despite this extreme genetic bottleneck, self-compatibility may provide V. seychellarum with some resistance to the genetic consequences of habitat fragmentation, at least in the short term. We discuss our findings in the context of other rare and threatened dipterocarp species which are vulnerable to miss-management of genetic resources and population fragmentation.

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“…Generally, diversity is higher in populations located in central parts of the distribution range. However, peripheral populations often have valuable adaptive traits that are specific to marginal environments [32], and species that have highly dispersed, isolated populations may not have a recognisable centralised distribution. Furthermore, issues related to population size matter.…”

Section: Introductionmentioning

confidence: 99%

Conservation Priorities for Prunus africana Defined with the Aid of Spatial Analysis of Genetic Data and Climatic Variables

et al. 2013

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Conservation priorities for Prunus africana, a tree species found across Afromontane regions, which is of great commercial interest internationally and of local value for rural communities, were defined with the aid of spatial analyses applied to a set of georeferenced molecular marker data (chloroplast and nuclear microsatellites) from 32 populations in 9 African countries. Two approaches for the selection of priority populations for conservation were used, differing in the way they optimize representation of intra-specific diversity of P. africana across a minimum number of populations. The first method (S1) was aimed at maximizing genetic diversity of the conservation units and their distinctiveness with regard to climatic conditions, the second method (S2) at optimizing representativeness of the genetic diversity found throughout the species’ range. Populations in East African countries (especially Kenya and Tanzania) were found to be of great conservation value, as suggested by previous findings. These populations are complemented by those in Madagascar and Cameroon. The combination of the two methods for prioritization led to the identification of a set of 6 priority populations. The potential distribution of P. africana was then modeled based on a dataset of 1,500 georeferenced observations. This enabled an assessment of whether the priority populations identified are exposed to threats from agricultural expansion and climate change, and whether they are located within the boundaries of protected areas. The range of the species has been affected by past climate change and the modeled distribution of P. africana indicates that the species is likely to be negatively affected in future, with an expected decrease in distribution by 2050. Based on these insights, further research at the regional and national scale is recommended, in order to strengthen P. africana conservation efforts.

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Genetic differences between continuous and disjunct populations: some insights from sal (Shorea robusta Roxb.) in Nepal

Cited by 11 publications

References 34 publications

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

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

Forest fragmentation genetics in a formerly widespread island endemic tree: Vateriopsis seychellarum (Dipterocarpaceae)

Conservation Priorities for Prunus africana Defined with the Aid of Spatial Analysis of Genetic Data and Climatic Variables

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