Conservation Genetics

, Volume 15, Issue 5, pp 1163–1172

Long-distance pollen dispersal ensures genetic connectivity of the low-density tree species, Eurycorymbus cavaleriei, in a fragmented karst forest landscape

Research Article

Abstract

Karst forest in southwest China represents one of the world’s most spectacular examples of tropical-subtropical karst landscapes and harbours high floristic richness and endemism. Many plant species tend to occur in naturally isolated patches due to the edaphic and topographic heterogeneity and are suffering an increasing stress of habitat deterioration due to both extensive human activities and global climate change in the area. Here Eurycorymbus cavaleriei was selected as a representative insect-pollinated plant species with low density to assess the pollen dispersal and mating patterns of such limestone associated trees. Paternity analysis revealed substantial long-distance pollination events, with a high level of pollen immigration (27.9–41.9 %) from outside the study sites over distance of at least 4,000 m. Pollen dispersal best fits an exponential power model with a fat-tailed (b < 1) feature and the average pollen dispersal distance was over 2,000 m inferred by the twogener analysis. Despite the dioecious nature, a small amount of biparental inbreeding and moderate correlated paternity were detected based on the multilocus mating system analysis. Relatively few pollen donors (Nep = 3.5–7.0) and substantial variance in male reproductive success (21–24 % of males were responsible for 52–58 % of pollinations) were detected. These results have important implications for the genetic conservation and management of E. cavaleriei. Extensive pollen dispersal provides evidence for substantial intra- and/or inter-patch pollinator movement, which seems promising for E. cavaleriei and other trees with generalized pollination system in karst forest landscape.

Keywords

Eurycorymbus cavaleriei Habitat fragmentation Karst forest Male mating success Paternity analysis Pollen dispersal 

Supplementary material

10592_2014_608_MOESM1_ESM.doc (810 kb)
Supplementary material 1 (DOC 810 kb)
10592_2014_608_MOESM2_ESM.doc (76 kb)
Supplementary material 2 (DOC 75 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical GardenChinese Academy of SciencesGuangzhouPeople’s Republic of China

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