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http://dx.doi.org/10.7850/jkso.2021.26.4.343

Experimental Transplantation for the Restoration of Seagrass, Zostera marina L. Bed Around Sinyangseopji Beach in Bangdu Bay, Jeju Island  

LEE, HYUNG WOO (Research Institute for Basic Sciences, Jeju National University)
KANG, JEONG CHAN (Research Institute for Basic Sciences, Jeju National University)
PARK, JUNG-IM (Marine-Eco Technology Institute)
KIM, MYUNG SOOK (Department of Biology, Jeju National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.26, no.4, 2021 , pp. 343-355 More about this Journal
Abstract
Eelgrass, Zostera marina L., was widely distributed around Sinyangseopji Beach in Bangdu Bay, on the eastern coast of Jeju Island, until breakwater construction in the late 1990s resulted in its complete loss. Six experimental sites were identified for restoration of the Z. marina bed in Bangdu Bay. Using the staple method, 500 Z. marina shoots were transplanted at each site in January 2019 and 2020. The transplants, along with environmental parameters, were monitored for 10 months following transplantation. There were significant differences in underwater irradiance, water temperature, and salinity among the sites, but all were suitable for Z. marina growth. The Ulva species, an opportunistic alga, appeared in spring and accumulated during summer at all sites; however, there was no significant effect of Ulva species on the survival and growth of the eelgrass transplants. Most of the transplanted Z. marina survived, and after 3 months, the density increased by 112.5-300% due to vegetative propagation, with a rapid rate of increase observed during spring and early summer at all sites. For 1-2 months after transplanting, the Z. marina shoots showed signs of transplant shock, after which the shoot density increased at all sites, confirming that all transplants adapted well to the new environment. However, in both 2019 and 2020, during late summer to early fall, the sites experienced heavy damage from typoons (twice in 2019 and three times in 2020) that hit Bangdu Bay. The transplants at two sites located in the center of Bangdu Bay were completely destroyed, but those at three sites located to the west of the bay showed a 192-312% increase in density. Thus, we confirmed that the Bangdu Bay Z. marina bed can be restored, with the highest probability of success for Z. marina restoration on the western side of Bangdu Bay, which is protected from typhoons.
Keywords
Eelgrass; Transplantation; Restoration; Optimal site; Bangdu Bay;
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