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http://dx.doi.org/10.11614/KSL.2016.49.2.110

Distribution, Life History and Growth Characteristics of the Utricularia japonica Makino in the East Coastal Lagoon, Korea  

Jeong, Yeon-In (Department of Biology, Gangneung-Wonju National University)
Hong, Bo-Ram (Department of Biology, Gangneung-Wonju National University)
Kim, Young-Chul (Department of Biology, Gangneung-Wonju National University)
Lee, Kyu-Song (Department of Biology, Gangneung-Wonju National University)
Publication Information
Korean Journal of Ecology and Environment / v.49, no.2, 2016 , pp. 110-123 More about this Journal
Abstract
In order to obtain scientific information for the conservation of Utricularia japonica Makino, rare plant species, we investigated life history, phenology, growth and distribution in the east coastal region of Korea. Seven habitats of U. japonica were confirmed in this study. Turion of U. japonica rests overwinter at the bottom and ripens at the water surface and then usually germinate and sprout when the water warms in spring. A single shoot grown from turion divided into several shoots. Shoot decomposition started in October and formed a new turion at the end of the decomposed shoot. Flowering period was from early July to late October. Percentage of flowering ramets was significantly low as 6.3%. U. japonica showed the fastest growth rate from April to July, the maximum growth in August and the highest biomass in October. U. japonica tended to be concentrated in larger ramets in the water depth of 50 cm~150 cm in Cheonjin lake. The main factors affecting the growth of U. japonica were water temperature and turbidity. The establishment and growth of U. japonica in Cheonjin lake were determined by responses to water temperature with seasonal change and to light conditions caused by the different plants. These conditions affect the temporal and spatial distribution of U. japonica and population change. The findings of this study would be helpful to provide the basic information needed for the conservation and restoration of U. japonica.
Keywords
Cheonjin lake; distribution; growth; lagoon; Utricularia;
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