Genetic structure and demographic history of the endangered tree species, Dysoxylum malabaricum (Meliaceae) in Western Ghats, India: Implications for conservation in a biodiversity hotspot
2013 (English)In: Ecology and Evolution, ISSN 2045-7758, Vol. 3, no 10, 3233-3248 p.Article in journal (Other academic) Published
The impact of fragmentation by human activities on genetic diversity of forest trees is an important concern in forest conservation, especially in tropical forests. Dysoxylummalabaricum (white cedar) is an economically important tree species, endemic to theWestern Ghats, India, one of the world's eight most important biodiversity hotspots. As D.malabaricum is under pressure of disturbance and fragmentation together with overharvesting, conservation efforts are required in this species. In this study, range-widegenetic structure of twelve D.malabaricum populations was evaluated to assess the impact ofhuman activities on genetic diversity and infer the species' evolutionary history, using both nuclear and chloroplast (cp) DNA simple sequence repeats (SSR). As genetic diversity and population structure did not differ among seedling, juvenile and adult age classes, reproductive success among the old-growth trees and long distance seed dispersal by hornbills were suggested to contribute to maintain genetic diversity. The fixation index (F-IS) was significantly correlated with latitude, with a higher level of inbreeding in the northern populations, possibly reflecting a more severe ecosystem disturbance in those populations. Both nuclear and cpSSRs revealed northern and southern genetic groups with some discordance of their distributions; however, they did not correlate with any of the two geographic gaps known as genetic barriers to animals. Approximate Bayesian computation-based inference from nuclear SSRs suggested that population divergence occurred beforethe last glacial maximum. Finally we discussed the implications of these results, in particularthe presence of a clear pattern of historical genetic subdivision, on conservation policies.
Place, publisher, year, edition, pages
2013. Vol. 3, no 10, 3233-3248 p.
Research subject Biology with specialization in Evolutionary Functional Genomics
IdentifiersURN: urn:nbn:se:uu:diva-198109DOI: 10.1002/ece3.669ISI: 000324932600004OAI: oai:DiVA.org:uu-198109DiVA: diva2:615216
De två (2) första författarna delar förstaförfattarskapet.2013-04-092013-04-092013-11-05Bibliographically approved