• Title/Summary/Keyword: The East sea of Korea

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A Newly Recorded Sea Cucumber of the Genus Psolus (Holothuroidea: Dendrochirotida: Psolidae) from the East Sea of Korea

  • Lee, Taekjun;Shin, Sook
    • Animal Systematics, Evolution and Diversity
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    • v.33 no.3
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    • pp.195-199
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    • 2017
  • A sea cucumber was collected from Gonghyeonjin in the East Sea of Korea at a depth of 50 m on 22 June 2011 and was identified as Psolus phantapus (Strussenfelt, 1765). This species belongs to the family Psolidae of the order Dendrochirotida based on morphological characteristics and mitochondrial cytochrome c oxidase subunit I sequence analysis. Psolus phantapus, which widely distributes in the Arctic and North Atlantic Oceans, is newly recorded in the Korean fauna. Two Psolus species including the previously reported P. squamatus are recorded in the East Sea of Korea.

A Newly Recorded Sea Star of Genus Henricia (Asteroidea: Spinulosida: Echinasteridea) from the East Sea of Korea

  • Shin, Sook;Ubagan, Michael D.
    • Korean Journal of Environmental Biology
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    • v.33 no.2
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    • pp.197-200
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    • 2015
  • Asteroid specimens were collected from Shinnam, Gangwondo in the East Sea of Korea with fishing nets on 12 September 2014. The specimens were identified as Henricia reticulata Hayashi, 1940, belonging to family Echinasteridea of order Spinulosida. This species can be distinguished by a larger disc and broader arms compared to those other Henricia species. The morphological characteristics of this species are re-described with illustrations. By previous work of this genus, six species have been reported in the Korean fauna.

First Record of Maritime Pseudoscorpion Garypus japonicus (Garypidae) from Korea

  • Choi, Eun-Hwa;Hwang, Ui-Wook
    • Animal Systematics, Evolution and Diversity
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    • v.25 no.3
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    • pp.261-264
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    • 2009
  • A maritime pseudo scorpion Garypus japonicus Beier, 1952 collected from Dokdo Island in the East Sea of Korea is reported and illustrated, which is the first record in Korea. The family Garypidae is also newly recorded in Korea. G. japonicus has been known only from Japan by Beier (1952) so far. Through the present study, its distributional range is extended to Korea.

A Systematic Study on the Asteroidea in the East Sea, Korea (한국 동해산 해성류의 계통분류학적 연구)

  • Sook Shin
    • Animal Systematics, Evolution and Diversity
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    • v.11 no.2
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    • pp.243-263
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    • 1995
  • Twenty-nine species of asteroids are reported to be distributed in the East Sea of Korea. Five species are reported to be distributed in the East Sea of Korea. Five speices are reported for the first time in Korea ; Solaster endeca (Linn, 1771), Lethasterias fusca D'yakonov, 1931, Lethasterias nanimensis chelifera (verrill, 1914), Lysastrosoma anthostictha Fisher, 1992 and Evasterias troscheli alveolata Verrill, 1914. The faunal composition and distribution of the asteroids in the East Sea of Korea are discussed.

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Study on Abnormal Distribution of High Concentration Chlorophyll a in the East Sea of Korea in Spring Season using Ocean Color Satellite Remote Sensing (해수색 원격탐사에 의한 동해 연근해역 클로로필 a 이상분포 연구)

  • Suh Young-Sang
    • Journal of Environmental Science International
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    • v.15 no.1
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    • pp.59-66
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    • 2006
  • High concentration of chlorophyll a occurred around the Ulleung Warm Eddy off Ulleung Island in the East Sea of Korea in spring season. The abnormal distributions of chlorophyll a were captured by satellite remote sensing and measured field data. The temporal and spatial scale of the abnormal distributions were around 20days and 50km diameter off Ullung Island. The anomalies were quantified b)'estimated chlorophyll a derived from OCM and SeaWiFS ocean color data from 2000 to 2004. The origin of abnormal hish concentrations was estimated by this study. It was that suspended material discharged from the Nakdong River and the coastal water located in the southeastern part of Korean Peninsula moved to northeastern coast, and then moved to off Ullung island, The high chlorophyll a concentrations including inorganic materials were accumulated by anticyclonic eddy such as the Ullung Warm Eddy around Ullung island in the East Sea of Korea in spring season.

Patterns of Vertical Distribution and Diel Vertical Migration of Zooplankton in the East Sea of Korea (Sea of Japan)

  • Park, Chul;Lee, Chang-Rae;Hong, Sung-Yun
    • Journal of the korean society of oceanography
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    • v.32 no.1
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    • pp.38-45
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    • 1997
  • To find out the changes in vertical distribution patterns over the 24-h period, a key and the first step to tackle the problem of adaptive significance of diel vertical migration (DVM), vertically stratified time series samplings with multiple opening/closing plankton samplers were done in the East Sea of Korea (Sea of Japan). Sampling was done almost every 4 h for one day period following the same water parcel in Nov. 1995 and May 1996, respectively. Resultant patterns of vertical distribution showed that some species such as most abundant taxa Metridia pacifica and Scolecithyicella minor, both Copepoda, performed DVM even in the study area of strong thermal stratification. Their patterns of DVM such as distance scales and timing of movements were not the same each other, and they were separated from other taxa in the dendrogram obtained by the cluster analyses, Most minor taxa grouped in one, however, seemed not to do DVM in the study area of strong thermal stratification. They usually preferred the warmer surface layer where the foods were probably more abundant.

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Spatio-temporal Distributions of the Wind Stress and the Thermocline in the East Sea of Korea

  • NA Jung-Yul;HAN Sang-Kyu
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.21 no.6
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    • pp.341-350
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    • 1988
  • The wind stress distribution over the East Sea of Korea was obtained from the shipboard observations of the Fisheries Research and Development Agency along the serial observation lines. These monthly and annual mean wind stress distributions were put into the simplified interface model which describes the latitudinal variations of the upper-layer thickness as function of the curl of the wind stress. The observed variations of the surface, zonally averaged winds indeed caused the upper-layer flow convergent and divergent at the latitudes that produced a tone of thick upper-layer or a deep permanent thermocline and the shallower depth with divergence. Thus, the wind field contributes positively to maintain the almost time-independent distribution of the interface of 'saddle like' feature in north-south direction over the study area.

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Modeling Environmental Effects on Detection Performances for Variable Depth Sonars in the East Sea of Korea

  • Na, Young-Nam;Cho, Chang-Bong;Han, Sang-Kyu
    • The Journal of the Acoustical Society of Korea
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    • v.23 no.2E
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    • pp.68-73
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    • 2004
  • In the East Sea of Korea, the ocean environments are known to have strong variations in space and time. Their effects are very important factors in sound propagation and sonar performance. We consider the environmental factors such as eddies and thermal fronts affecting underwater sound propagation and target detection performance by sonars. Unfortunately, however, the detailed structure of eddies is usually difficult to understand by using the sea surface temperatures from infrared images alone or a few profiles from the CTD (conductivity, temperature and depth) castings. The temperature fields of eddy and thermal front are simulated with typical patterns of those obtained from several observations. This paper delivers the overviews of environments and acoustic models with their simulation results on sonar performance.

Water Quality Assessment at Coastal Area of the East Sea of Korea (한국 동해연안의 수질 평가)

  • Kim, Young-Sug;Lee, Yong-Hwa;Choi, Hee-Gu
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.18 no.1
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    • pp.15-24
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    • 2012
  • This study aims to investigate characteristics of water quality factors by using survey results of national marine environmental monitoring system from 2004 to 2010 at coastal area of the East Sea of Korea. In this study, we chose statistical methods to analyze the correlation among water quality parameters and principal component analysis for characteristics of each water environment. In addition to this, we evaluated each water's pollution level based on eutrophication standard of OECD, Eutrophication Index(EI), and Organic Pollution Index(OPI). Major factors were chlorophyll a and salt according to the analysis at coastal area of the East Sea. The sea was divided into the south and the central part by Jukbyeon. Also, Jukbyeon in the central part of the East Sea and Gampo in the southern sea coastal waters have been classified separately. The nutritional status of coastal area of East Sea presented Mesotrophic to Oligotrophic level and EI showed less than 1. OPI in all of the coastal area at the East Sea represented that the water quality condition was favorable.

Comparison of water qualities and pollutants discharged to the East sea of Korea from Namdae and Yeongok stream in the Gangneung city (강릉 남대천과 연곡천의 수질과 동해 연안으로 방류되는 오염물질의 량 비교)

  • Yoon Yi Yong
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.6 no.1
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    • pp.68-77
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    • 2003
  • The Water quality of Namdae and Yeongok stream, located in the Kangnung City, and pollutants discharged to the east sea of Korea were investigated during april to November 2002 in order to understand the costal pollution phenomena. The water qualify grade of Namdae stream vary between II and V of water standard. On the other hand, that of Yeongok Stream is keeping I or II. The temporal and spacial variation of Namdae stream are higher than Yeongok stream. The water pollutants discharged to the east sea of Korea from Yeongok stream are lower 15.5 times for BOD, 2.6 times for COD, 1.7 times for T-N, 6.9 times for T-P than from Namdae stream, of which water flux are 1.4 times higher and contain much more of pollutants than Yeongok stream. It may have some effect on the costal ecosystem according to their pollutant flux.

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