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http://dx.doi.org/10.11110/kjpt.2017.47.4.289

Notes on fine-scale spatial distribution of three Cephalanthera species (Orchidaceae) that grow in sympatry in Korea: Implications for maintenance of species boundaries  

Chung, Mi Yoon (Division of Life Science and the Research Institute of Natural Science, Gyeongsang National University)
Lopez-Pujol, Jordi (BioC-GReB, Botanic Institute of Barcelona (IBB-CSIC-ICUB))
Chung, Myong Gi (Division of Life Science and the Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Korean Journal of Plant Taxonomy / v.47, no.4, 2017 , pp. 289-296 More about this Journal
Abstract
The three self-compatible, terrestrial orchids Cephalanthera erecta, C. falcata, and C. longibracteata flower synchronously in sympatric populations. Cephalanthera erecta and C. longibracteata, which have white flowers that do not fully open, are predominantly autogamous, whereas the food-deceptive C. falcata, whose bright yellow flowers open completely, is predominantly outcrossing. The formation of hybrids rarely occurs between species owing to strong prepollination barriers (floral isolation). If these three species have evolved toward the prevention of interspecific hybridization, we can expect that the spatial distribution patterns of the three species would be characterized as spatial segregation (i.e., 'spatial repulsion') from each other. To test this prediction, we studied the three Cephalanthera species in sympatric populations showing coincident flowering within Yeonwhasan Provincial Park (YPP, Gyeongsangnam Province, South Korea). We found strong spatial aggregation in each population and spatial independence in the interspecific spatial distribution, differing from previous studies. We further hypothesize that Cephalanthera species in sympatry within YPP are distributed somewhat randomly in space, perhaps due to the sharing of similar mycorrhizal fungi.
Keywords
autogamy; Cephalanthera; outcrossing; reproductive isolation; spatial distribution patterns;
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