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http://dx.doi.org/10.7850/jkso.2019.24.4.548

Growth Dynamics of the Surfgrass, Phyllospadix Japonicus on the Southeastern Coast of Korea  

PARK, JUNG-IM (Marine-Eco Technology Institute)
KIM, JAE HOON (Marine-Eco Technology Institute)
KIM, JONG-HYEOB (Marine-Eco Technology Institute)
KIM, MYUNG SOOK (Department of Biology and Research Institute for Basic Sciences, Jeju National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.24, no.4, 2019 , pp. 548-561 More about this Journal
Abstract
The surfgrass Phyllospadix japonicus is a dominant seagrass species playing critical ecological roles on the eastern coast of Korea. However, few studies have been conducted on the ecological characteristics of this species, generally due to the turbulent water conditions in its habitat. In this study, to examine the growth dynamics of P. japonicus, we investigated monthly changes in morphological characteristics, density, biomass, and leaf productivity as well as changes in the underwater irradiance, water temperature, and water column nutrient concentrations of its habitat from August 2017 to July 2018. Underwater irradiance and water temperature showed clear seasonal changes increasing in spring and summer and decreasing in fall and winter. Nutrient availability fluctuated substantially, but did not display any distinct seasonal trend. Morphological characteristics, shoot density, biomass, and leaf productivities of P. japonicus exhibited significant seasonal variations, increasing in spring and decreasing in fall months. Spadix of P. japonicus occurred from March to August, with the maximum spadix percentage(15.8%) occurred in May 2018. The average leaf productivity of P. japonicus per shoot and area were 2.1 mg sht-1 d-1 and 7.5 g m-2 d-1, respectively. The optimum water temperature for the growth of P. japonicus in this study was between 13-14℃. The productivity of P. japonicus was not correlated with underwater irradiance, water temperature and nutrient concentrations. These results suggest that the study site provide sufficient amount of underwater irradiance, suitable water temperature range and nutrients for the growth of P. japonicus.
Keywords
Surfgrass; Phyllospadix japonicus; Growth dynamics; Underwater irradiance; Water temperature;
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Times Cited By KSCI : 1  (Citation Analysis)
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