Was Jeju Island a glacial refugium for East Asian warm‐temperate plants? Insights from the homosporous fern <i>Selliguea hastata</i> (Polypodiaceae)

Chung, Mi Yoon; Moon, Myung Ok; López‐Pujol, Jordi; Maki, Masayuki; Yamashiro, Tadashi; Yukawa, Tomohisa; Sugiura, Norío; Lee, Yung I.; Chung, Myong Gi

doi:10.3732/ajb.1300134

Cited by 14 publications

(8 citation statements)

References 79 publications

(95 reference statements)

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“…Previous studies using allozymes or microsatellites showed that the standardized F’ ST values are strongly variable in homosporous fern species (as they are in seed plant species), e.g. F’ ST = 0.068 for Odontosoria chinensis in Hawaii [ 58 ], F’ ST = 0.761 for Dryopteris aemura in Spain [ 59 ], F’ ST = 0.589 for Cyrtomium falcatum in Korea [ 47 ], and F’ ST = 0.414 for Selliguea hastata in Japan [ 60 ] (all F’ ST values calculated by R.I.). The F ’ ST values (0.739) of the present study are relatively high.…”

Section: Discussionmentioning

confidence: 99%

The Relationship between Mating System and Genetic Diversity in Diploid Sexual Populations of Cyrtomium falcatum in Japan

et al. 2016

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The impact of variation in mating system on genetic diversity is a well-debated topic in evolutionary biology. The diploid sexual race of Cyrtomium falcatum (Japanese holly fern) shows mating system variation, i.e., it displays two different types of sexual expression (gametangia formation) in gametophytes: mixed (M) type and separate (S) type. We examined whether there is variation in the selfing rate among populations of this species, and evaluated the relationship between mating system, genetic diversity and effective population size using microsatellites. In this study, we developed eight new microsatellite markers and evaluated genetic diversity and structure of seven populations (four M-type and three S-type). Past effective population sizes (Ne) were inferred using Approximate Bayesian computation (ABC). The values of fixation index (FIS), allelic richness (AR) and gene diversity (h) differed significantly between the M-type (FIS: 0.626, AR: 1.999, h: 0.152) and the S-type (FIS: 0.208, AR: 2.718, h: 0.367) populations (when admixed individuals were removed from two populations). Although evidence of past bottleneck events was detected in all populations by ABC, the current Ne of the M-type populations was about a third of that of the S-type populations. These results suggest that the M-type populations have experienced more frequent bottlenecks, which could be related to their higher colonization ability via gametophytic selfing. Although high population differentiation among populations was detected (FST = 0.581, F’ST = 0.739), there was no clear genetic differentiation between the M- and S-types. Instead, significant isolation by distance was detected among all populations. These results suggest that mating system variation in this species is generated by the selection for single spore colonization during local extinction and recolonization events and there is no genetic structure due to mating system.

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Section: Discussionmentioning

confidence: 99%

The Relationship between Mating System and Genetic Diversity in Diploid Sexual Populations of Cyrtomium falcatum in Japan

et al. 2016

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“…(Chung, ) and Oreorchis coreana Finet (Chung et al ., ), and the fern Selliguea hastata (Thunb.) H.Ohashi & K.Ohashi (Chung et al ., in press). Under a scenario of immigration from multiple refugia, this lack of genetic variability would have required either that all the source populations were genetically identical and homozygous or that the genetic drift led to the fixation of the same alleles, which is equally unlikely.…”

Section: Discussionmentioning

confidence: 99%

Population history of the terrestrial orchidCremastra appendiculatavar.variabilisfrom Korea, inferred from levels and distribution of genetic diversity

et al. 2013

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Cremastra appendiculata var. variabilis is a self‐compatible, insect‐pollinated, terrestrial orchid that is a typical member of the warm‐temperate vegetation in the Korean Peninsula. Here we examine levels and partitioning of allozyme diversity (22 loci) in 12 populations of this orchid to gain insight into its genetic structure and post‐glacial colonization history in Korea. It harboured considerably higher levels of genetic variation within populations (%P = 48.1, A = 1.70 and He = 0.217) and lower degree of differentiation among populations (FST = 0.068) than those typical of allozyme‐based studies in other terrestrial orchid species. These patterns suggest that extant populations were derived from multiple source populations (i.e. from multiple glacial refugia), although further studies are needed to confirm this scenario. In addition to population history, traits such as high potential of seed dispersal, a mixed mating system and its occurrence in large and continuous populations would have contributed to the current levels and distribution of genetic diversity in Korean populations of C. appendiculata var. variabilis. © 2013 The Linnean Society of London, Botanical Journal of the Linnean Society, 2013, 173, 721–732.

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“…These lines of evidences indicated that Jeju was not suitable for R. weyrichii; however, Bayesian clustering and demographic analyses suggested that R. weyrichii may have survived in restricted and scattered habitats on or around the island during the LGM. The possibility of the invisible refugia is supported by the high genetic diversity of tree species on the island (Chung et al, 2013;Lee, Lee, & Choi, 2013;Lee, Lee, Choi, & Choi, 2014). These regional differences in population size between the islands suggest that environmental sustainability is a key factor in maintaining a population under conditions in which there are few migrations among populations (Frankham, 2005;Morjan & Rieseberg, 2004).…”

Section: Differences In Population Survival Among Islandsmentioning

confidence: 99%

Population demographic history of a temperate shrub, Rhododendron weyrichii (Ericaceae), on continental islands of Japan and South Korea

Yoichi

Tamaki

Sakaguchi

et al. 2016

Ecology and Evolution

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Continental islands provide opportunities for testing the effects of isolation and migration on genetic variation in plant populations. In characteristic of continental islands is that the geographic connections between these islands, which are currently distinguished by seaways, have experienced fluctuations caused by sea‐level changes due to climate oscillations during the Quaternary. Plant populations on the islands have migrated between these islands via the exposed seafloors or been isolated. Here, we examined the demographic history of a temperate shrub, Rhododendron weyrichii, which is distributed in the southwestern parts of the Japanese archipelago and on an island of South Korea, using statistical phylogeographic approaches based on the DNA sequences of two chloroplast and eight nuclear loci in samples analyzed from 18 populations on eight continental islands, and palaeodistribution modeling. Time estimates for four island populations indicate that the durations of vicariance history are different between these populations, and these events have continued since the last glacial or may have predated the last glacial. The constancy or expansion of population sizes on the Japanese islands, and in contrast a bottleneck in population size on the Korean island Jeju, suggests that these islands may have provided different conditions for sustaining populations. The result of palaeodistribution modeling indicates that the longitudinal range of the species as a whole has not changed greatly since the last glacial maximum. These results indicate that exposed seafloors during the glacial period formed both effective and ineffective migration corridors. These findings may shed light on the effects of seafloor exposure on the migration of plants distributed across continental islands.

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Was Jeju Island a glacial refugium for East Asian warm‐temperate plants? Insights from the homosporous fern Selliguea hastata (Polypodiaceae)

Cited by 14 publications

References 79 publications

The Relationship between Mating System and Genetic Diversity in Diploid Sexual Populations of Cyrtomium falcatum in Japan

The Relationship between Mating System and Genetic Diversity in Diploid Sexual Populations of Cyrtomium falcatum in Japan

Population history of the terrestrial orchidCremastra appendiculatavar.variabilisfrom Korea, inferred from levels and distribution of genetic diversity

Population demographic history of a temperate shrub, Rhododendron weyrichii (Ericaceae), on continental islands of Japan and South Korea

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