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DOI: 10.1371/journal.pone.0138783
论文题名:
Limited Pollen Dispersal Contributes to Population Genetic Structure but Not Local Adaptation in Quercus oleoides Forests of Costa Rica
作者: Nicholas John Deacon; Jeannine Cavender-Bares
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2015
发表日期: 2015-9-25
卷: 10, 期:9
语种: 英语
英文关键词: Population genetics ; Pollen ; Genetic loci ; Genetic polymorphism ; Seedlings ; Phylogenetic analysis ; Phylogeography ; Oaks
英文摘要: Background Quercus oleoides Cham. and Schlect., tropical live oak, is a species of conservation importance in its southern range limit of northwestern Costa Rica. It occurs in high-density stands across a fragmented landscape spanning a contrasting elevation and precipitation gradient. We examined genetic diversity and spatial genetic structure in this geographically isolated and genetically distinct population. We characterized population genetic diversity at 11 nuclear microsatellite loci in 260 individuals from 13 sites. We monitored flowering time at 10 sites, and characterized the local environment in order to compare observed spatial genetic structure to hypotheses of isolation-by-distance and isolation-by-environment. Finally, we quantified pollen dispersal distances and tested for local adaptation through a reciprocal transplant experiment in order to experimentally address these hypotheses. Results High genetic diversity is maintained in the population and the genetic variation is significantly structured among sampled sites. We identified 5 distinct genetic clusters and average pollen dispersal predominately occurred over short distances. Differences among sites in flowering phenology and environmental factors, however, were not strictly associated with genetic differentiation. Growth and survival of upland and lowland progeny in their native and foreign environments was expected to exhibit evidence of local adaptation due to the more extreme dry season in the lowlands. Seedlings planted in the lowland garden experienced much higher mortality than seedlings in the upland garden, but we did not identify evidence for local adaptation. Conclusion Overall, this study indicates that the Costa Rican Q. oleoides population has a rich population genetic history. Despite environmental heterogeneity and habitat fragmentation, isolation-by-distance and isolation-by-environment alone do not explain spatial genetic structure. These results add to studies of genetic structure by examining a common, tropical tree over multiple habitats and provide information for managers of a successional forest in a protected area.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0138783&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/21508
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, United States of America;Plant Biological Sciences Graduate Program, University of Minnesota, St. Paul, Minnesota, United States of America;Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, Minnesota, United States of America

Recommended Citation:
Nicholas John Deacon,Jeannine Cavender-Bares. Limited Pollen Dispersal Contributes to Population Genetic Structure but Not Local Adaptation in Quercus oleoides Forests of Costa Rica[J]. PLOS ONE,2015-01-01,10(9)
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