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Korean J. Pl. Taxon > Accepted Articles
Korean Journal of Plant Taxonomy 2017;0(0)
Notes on fine-scale spatial distribution of three Cephalanthera species (Orchidaceae) that grow in sympatry in Korea: implications for maintenance of species boundaries
Mi Yoon Chung1, Jordi López-Pujol2, Myong Gi Chung1
1 Gyeongsang National University, Jinju 52828, Korea
2Botanic Institute of Barcelona (IBB-CSIC-ICUB) , Barcelona, Spain
Correspondence :  Myong Gi Chung ,Tel: 055 772 1343, Fax: 055 772 1349, Email: mgchung@gnu.ac.kr
Received: November 19, 2017   Accepted: December 13, 2017
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. Formation of hybrids rarely occurs between species owing to strong pre-pollination barriers (floral isolation). If these three species have evolved toward prevention of interspecific hybridization, we may expect that spatial distribution patterns of the three species would be of 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, which differs from previous studies. We further hypothesize that Cephalanthera species in sympatry within YPP are distributed somewhat randomly in space, perhaps due to sharing of similar mycorrhizal fungi.
KeyWords: autogamy; Cephalanthera; outcrossing; reproductive isolation; spatial distribution patterns
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