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http://dx.doi.org/10.13047/KJEE.2021.35.1.48

Distribution Characteristics, Population Structure and Dynamics of the Endangered Plant, Viola websteri Hemsl.  

Chae, Hyun-Hee (Department of Biology, Gangneung-Wonju National University)
Kim, Young-Chul (Research Center for Natural Science, Gangneung-Wonju National University)
Kwak, Myoung-Hai (Plants Resource Division, Biological Resources Research Department, National Institute of Biological Resource)
Nam, Gi-Heum (Plants Resource Division, Biological Resources Research Department, National Institute of Biological Resource)
Publication Information
Korean Journal of Environment and Ecology / v.35, no.1, 2021 , pp. 48-67 More about this Journal
Abstract
Plant species exhibit current characteristics as a result of interactions with environmental conditions. The plants of Viola sp. have selected chasmogamous flowers with vigorous vegetative propagation or development of cleistogamous flowers as an adaptation strategy. Viola websteri is distributed on the Korean peninsula and the eastern part of Jilin Province, China. The center and edge of the distribution are expected to exhibit different population-dynamics. It is necessary to investigate the cause of its current limited distribution even though V. websteri has a mixed-mating strategy. Firstly, We examined the vegetation environment of habitats and evaluated its characteristics. Growth characteristics were examined through plant phenology. We then evaluated the population structure, characteristics of chasmogamous flowers, and productivity of cleistogamous flowers. Moreover, we compared population sizes between 2014 and 2018. Most habitats were located in deciduous broadleaf mixed forests adjacent to valleys. V. websteri produced chasmogamous flowers with self-incompatibility in April-May and cleistogamous flowers in June-September. The cleistogamous flower production is a strategy ensuring seed production under uncertain environmental fluctuations; these were approximately twice as numerous as chasmogamous flowers. The population structure was distinguished into stable and very unstable regions. There were sites where the population experienced a sharp decline in the 2018 compared to that of 2014. This large decline was found in the edge populations. The habitats had different microsites depending on the natural disturbances of drought and the matrix constituting the habitat, thus supporting various plants. Ensuring the production of seeds through cleistogamous flowers, it was determined that rapid seedling re-establishment and population replenishment were possible when the natural disturbance factor was removed. Environmental factors did not equally affect all populations or individuals. Therefore, it was expected that it would be able to persisted in a long time, despite the rapid decrease in the number of individuals in the population regionally. Local extinction and re-establishment are likely to repeat according to environmental change. We propose the additional population investigation based on this works are required. We also suggest a need to assess the long-term population dynamics and the genetic characteristics of chasmogamous flowers and cleistogamous flowers to establish and implement effective conservation strategies.
Keywords
CONSERVATION; REAR EDGE POPULATION; REPRODUCTION TRAITS; CLEISTOGAMOUS; PHENOLOGY;
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