Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests
Knowledge of genetic variation and connectivity is of great importance to protect endangered species. The region of East Sichuan and West Hubei in China is the biodiversity center of broad-leaved trees in the world, which experienced severe forest fragmentation during the past several decades. Magno...
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doaj-e559354cb94f4a14be06eaca34d91a8f2020-12-31T04:42:17ZengElsevierGlobal Ecology and Conservation2351-98942020-12-0124e01227Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forestsXiang-Rong Fan0Godfrey K. Wagutu1Xiang-Ying Wen2Shao-Lin Chen3Yan-Ling Liu4Yuan-Yuan Chen5College of Science, Tibet University, Lhasa, 850000, Tibet Autonomous Region, PR China; Research Center for Ecology and Environment of Qinghai-Tibetan Plateau, Tibet University, Lhasa, 850000, Tibet Autonomous Region, PR China; Key Laboratory of Aquatic Plant and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, PR ChinaKey Laboratory of Aquatic Plant and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR ChinaSouth China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR ChinaThe Xingdoushan National Nature Reserve, Hubei, PR ChinaKey Laboratory of Aquatic Plant and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, PR ChinaKey Laboratory of Aquatic Plant and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, PR China; Corresponding author. Key Laboratory of Aquatic Plant and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, Hubei, PR China.Knowledge of genetic variation and connectivity is of great importance to protect endangered species. The region of East Sichuan and West Hubei in China is the biodiversity center of broad-leaved trees in the world, which experienced severe forest fragmentation during the past several decades. Magnolia patungensis is an endangered horticultural tree species endemic to this area. For 16 microsatellite markers, low genetic variations (HE = 0.228–0.364) and high genetic differentiation (FST = 34.0%, G″ST = 53.4%) were found in the four extant M. patungensis populations. These were explained by the genetic bottleneck, genetic drift, inbreeding and restricted gene flow. The low level of historical gene flow (Nmhis = 0.762) among M. patungensis populations was attributed to its limited dispersal ability of pollens and seeds, and the complex terrains of habitats (high mountains, deep valleys, and dense forests). Lower contemporary gene flow (Nmcon = 0.474) suggested that the gene flow was further hindered by recent habitat fragmentations. As for conservation strategies, all remaining populations should be protected to maximize gene representation of the tree species; the artificial pollination is recommended within each population in order to increase seed setting.http://www.sciencedirect.com/science/article/pii/S235198942030768XHabitat fragmentationGene flowGenetic connectivityGenetic diversityMicrosatelliteMagnolia patungensis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiang-Rong Fan Godfrey K. Wagutu Xiang-Ying Wen Shao-Lin Chen Yan-Ling Liu Yuan-Yuan Chen |
spellingShingle |
Xiang-Rong Fan Godfrey K. Wagutu Xiang-Ying Wen Shao-Lin Chen Yan-Ling Liu Yuan-Yuan Chen Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests Global Ecology and Conservation Habitat fragmentation Gene flow Genetic connectivity Genetic diversity Microsatellite Magnolia patungensis |
author_facet |
Xiang-Rong Fan Godfrey K. Wagutu Xiang-Ying Wen Shao-Lin Chen Yan-Ling Liu Yuan-Yuan Chen |
author_sort |
Xiang-Rong Fan |
title |
Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests |
title_short |
Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests |
title_full |
Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests |
title_fullStr |
Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests |
title_full_unstemmed |
Decreasing genetic connectivity in the endangered tree Magnolia patungensis in fragmented forests |
title_sort |
decreasing genetic connectivity in the endangered tree magnolia patungensis in fragmented forests |
publisher |
Elsevier |
series |
Global Ecology and Conservation |
issn |
2351-9894 |
publishDate |
2020-12-01 |
description |
Knowledge of genetic variation and connectivity is of great importance to protect endangered species. The region of East Sichuan and West Hubei in China is the biodiversity center of broad-leaved trees in the world, which experienced severe forest fragmentation during the past several decades. Magnolia patungensis is an endangered horticultural tree species endemic to this area. For 16 microsatellite markers, low genetic variations (HE = 0.228–0.364) and high genetic differentiation (FST = 34.0%, G″ST = 53.4%) were found in the four extant M. patungensis populations. These were explained by the genetic bottleneck, genetic drift, inbreeding and restricted gene flow. The low level of historical gene flow (Nmhis = 0.762) among M. patungensis populations was attributed to its limited dispersal ability of pollens and seeds, and the complex terrains of habitats (high mountains, deep valleys, and dense forests). Lower contemporary gene flow (Nmcon = 0.474) suggested that the gene flow was further hindered by recent habitat fragmentations. As for conservation strategies, all remaining populations should be protected to maximize gene representation of the tree species; the artificial pollination is recommended within each population in order to increase seed setting. |
topic |
Habitat fragmentation Gene flow Genetic connectivity Genetic diversity Microsatellite Magnolia patungensis |
url |
http://www.sciencedirect.com/science/article/pii/S235198942030768X |
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