Extremely low levels of genetic variation in the critically endangered monotypic fern genus Mankyua chejuense (Ophioglossaceae) from Korea: Implications for conservation |
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| Authors: | Mi Yoon Chung John D Nason Byung-Yun Sun Myung-Ok Moon Jae Min Chung Chong-Wook Park Myong Gi Chung |
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| Institution: | 1. Department of Biology, Gyeongsang National University, Jinju 660-701, Republic of Korea;2. Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA;3. Faculty of Biological Sciences, Chonbuk National University, Chonju 561-756, Republic of Korea;4. Department of Biology, Jeju National University, Jeju 690-756, Republic of Korea;5. Department of Plant Resources Conservation, Korea National Arboretum, Pocheon 487-821, Republic of Korea;6. School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea |
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| Abstract: | We investigated allozyme variation in 16 populations of the rare monotypic fern Mankyua chejuense and 11 populations of a closely related, widespread fern Botrychium ternatum. Genetic diversity was extremely low in the critically endangered M. chejuense (%Ps = 10%, As = 1.13, and Hes = 0.007) relative to that found in B. ternatum (%Ps = 22.7%, As = 1.23, and Hes = 0.026). We detected homozygous genotypes for alternative alleles at a few loci, which suggests occurrence of intragametophytic self-fertilization. High degrees of population differentiation were found in both M. chejuense (FST = 0.245) and B. ternatum (FST = 0.414).The extremely low levels of genetic diversity in M. chejuense would be attributable to inbreeding coupled with random genetic drift and rarity. In situ protection of habitats of standing populations and ex situ preservation of several populations are suggested for the development of conservation strategies for M. chejuense. |
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| Keywords: | Allozymes Botrychium ternatum Conservation Genetic diversity Mankyua chejuense Monotypic genus Ophioglossaceae |
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