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윤원득,한기연,Jing Dong,채진호 한국해양과학기술원 2018 Ocean science journal Vol.53 No.4
Nemopilema nomurai, an endemic and blooming jellyfish species in the waters of Korea, China and Japan, were monitored from June to October, 2017, in the Bohai and northwestern Yellow Seas, using the ship sighting method, as a preliminary study to investigate the spatiotemporal distribution of medusae. Monitoring revealed that the mass appearance of young medusae was observed in Liaodong Bay in summer. In late summer they disappeared and a high density zone shifted to the mid- and northern Bohai Strait. In early fall, healthy adults with relatively high density were observed in the area around the border of the South and North Yellow Seas. These results suggest that medusae of N. nomurai originated from the Bohai Sea and were advected into the Yellow Sea through the Bohai Strait.
황해산 Euphausia pacifica (난바다곤쟁이목: 갑각강)의 생물학적 연구
윤원득,김세화 용인대학교 자연과학연구소 2000 自然科學硏究所論文誌 Vol.5 No.1
Euphausia pacifica were collected in the middle and southern part of the Yellow Sea in August 1997 (summer population) and February 1998 (winter population), Biological characteristics, e.g., body length (total: TL, carapace: CL and 6th segment lengths. SL) and body weight (dry and ash free dry weights) were measured and compared. Body length of summer population was measured to be smaller than that of winter population possibly due to the prevalence of juveniles in the summer. The result suggests that the reproduction was more intensive in the summer than winter. Relationships between body length, viz., TL and CL, TL and SL, and CL and SL, showed to be linear with high significance (P〈0.001) and constant regardless of the season. Mean dry and ash free dry weight of E. pacifica were 36㎍ and 29㎍ for summer population and 23㎍ and 13㎍ for winter one, respectively. Ash free dry weight represented 88.6% of dry weight in the summer and 75.6% in winter. This difference of 13% with season seemed to be related to environmental conditions such as water temperature and food availability, i.e., summer temperature and prey abundance enhanced the Production of E. pacifica. Every relationship between various body lengths and weights was highly significant (p〈0.001). Seasonal variation in the relationships between various lengths and weights was discussed in relation to the seasonal change of body composition, e.g., lipid contents, etc., for reproduction.
윤원득,최성환,한창훈,박원규 한국해양과학기술원 2014 Ocean science journal Vol.49 No.2
Planulae of Aurelia aurita were exposed to 11 types of rocks (basalt, gabbro, granite, rhyolite, sandstone, limestone, onglomerate, gneiss, quartzite, marble and schist) to examine heir attachment preference among rock material and position. umbers of attached polyps was the highest on marble and the east on limestone. Their preference with regard to settling position as the same among the rocks, showing the highest density of olyps on the underside (88.5%) compared to upper (23.6%) and erpendicular sides (10.3%) of rock. The results showed that hile position preference is more important than rock property, igher numbers of polyps were observed in rocks with a medium urface hardness.
윤원득,채진호,고병설,한창훈 한국해양과학기술원 2018 Ocean science journal Vol.53 No.3
Aurelia coerulea is a bloom forming jellyfish that first appeared before 1980 in the western and southern Korean seas and which has been blamed for huge economical losses in all fields of marine activities. As a preventive measure to reduce economical losses, polyp removal was undertaken at Lake Shihwa, Lake Saemangeum, and Masan Bay, Korea. In the course of efforts during 2 years to remove polyps, polyps were surveyed, quantified, and removed. In these areas, the initial total polyp abundance was 5.04 × 109 and 46.25% of them were removed; Lake Shihwa the highest rates of removal and Lake Saemangeum the lowest. These efforts to remove polyps prevented the appearance of 1.20 × 109 medusae, corresponding to 78.28 × 106 kg. The cost of polyp removal was evaluated and compared with that of medusae removal. The ratio between the cost of polyp removal and that of medusae removal ranged between 0.78–3.14%, indicating large cost savings for polyp removal undertakings. However, the effect of polyp removal varied from positive to none, and we assumed that the cleared surface for polyp removal, quantity of removed polyp, and existence of polyps’ hotspots in neighboring areas were the causes of the non-effectiveness of polyp removal undertakings.
윤원득,최병주,유현수,김병호,복영욱,채진호 한국해양과학기술원 2022 Ocean science journal Vol.57 No.2
In the spring of 2021, a large number of Salpa fusiformis suddenly appeared along the east coast of the Korean Peninsula and invaded a nuclear power plant (NPP) in large numbers. To understand the mechanisms and causes of the mass appearance and intrusion of S. fusiformis, field surveys were undertaken and collected observational data such as temperature, salinity, and ocean currents, and wind data were tabulated and analyzed. Field surveys in the offshore area of the NPP revealed that warm, saline, and less-oxygenated water flowed northward at approximately 25 km from the coastline, and that this water mass was that of the East Korean Warm Current (EKWC), with aggregated individuals (blastozooids) dominating the population of S. fusiformis. In the EKWC region, S. fusiformis were more abundant in the coastal area than in the center of the EKWC. Sea surface temperature and surface currents from satellite data showed that a thermal front was formed between the EKWC and the cold coastal waters off the NPP. The main path of the EKWC was close to the coast, and on days when S. fusiformis invaded the NPP in large numbers, the wind direction near the NPP was west-northwest. We suggest that large-scale invasions of the NPP by S. fusiformis can be predicted by incorporating appropriate field survey data into a particle tracking model that considers the direction and speed of the EKWC, the abundance of S. fusiformis in the EKWC, the location of thermal fronts, and wind direction and speed.
임동현,윤원득,양준용,이윤,Lim, Dong-Hyun,Yoon, Won-Duk,Yang, Joon-Yong,Lee, Yoon 해양환경안전학회 2009 海洋環境安全學會誌 Vol.15 No.4
본 연구는 우리나라와 중국 간의 황해 환경에 대한 조사 필요성에 의하여 공동으로 수행한 결과 중 일부이다. 계절에 따른 황해 동물플랑크톤 군집의 변동을 보기 위하여 1998년부터 2003년까지 6년에 걸쳐 매년 1회 3개 선 24개 정점에서 동물플랑크톤을 채집하였다. 채집된 동물플랑크톤 시료는 일정 비율로 분할 후 생물량을 측정하였으며, 1998, 2000, 2002년 등 3개년에 걸쳐 주요 분류군의 경우 종수준까지 동정하였고, 1999, 2001, 2003년 등 3개년은 주요 분류군 수준까지 동정하였다. 이러한 결과에서 황해 동물플랑크톤 군집의 계절적 분포 변동에 따른 특성을 파악하였다. 조사시기에 따른 공간적 분포 양상에 있어 반복성은 나타나지 않았다. 가장 중요 분류군인 요각류의 경우 한국측 해역에서 높은 분포를 보였으며, 모악류의 경우 중국측 해역에서 높았다. 현 결과에서 조사시기 동안 황해를 대표하는 요각류는 Calanus sinicus, Paracalanus parvus s.l., Oithona atlantica, Corycaeus affinis 등 4종으로 이들 종의 밀도 변화가 수산자원의 양에 영향을 미칠 수 있는 중요한 요인으로 생각할 수 있다. The joint cruises of six times between Korea and China were carried out for a better understanding of the environmental and oceanographical characteristics of the Yellow Sea for 6 years from 1998 to 2003. Zooplankton samples were collected one time per year at 24 stations on 3 lines of the Yellow Sea. The aim of this study is to understand the seasonal fluctuation of zooplankton community in the Yellow Sea. There is no trend on the spatio-temporal distribution of zooplankton. Copepoda, the major taxon of the Yellow Sea, was high in distribution in the eastern part and Chaetognatha in the western part of the Yellow Sea. In this results, the dominant copepods were Calanus sinicus, Paracalanus parvus s.l., Oithona atlantica, and Corycaeus affinis during the study periods. The density fluctuation of these dominant species may be an important factor in determining the fisheries resource of the Yellow Sea.