• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.377-378
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• 2000

엘니뇨는 대규모 기후의 경년변화를 대표하는 현상으로 2∼8년 주기로 반복적으로 발생하여 적도지방뿐만 아니라 중위도의 기후에도 영향을 미친다(Ropelewski and Halpert, 1987, 1989). 또한, 북태평양에서 발생하는 엘니뇨는 대기기후시스템(atmospheric climate system)과 밀접하게 관련되어 있으며, 북서태평양에서 엘니뇨 징후는 동북태평양에서처럼 분명하지는 않지만 국부적인 징후를 나타내고 있다. 이 연구의 목적은 엘니뇨의 중심지인 캘리포니아 연안의 반대편에 위치한 동중국해에서 1997∼1998 발생한 엘니뇨와 관련하여 나타나는 징후를 밝히는데 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.183-184
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• 2000

김 양식장은 대부분 천해해역으로서 영양염류가 풍부하여 김의 생산력은 증가되나 풍부한 영양염은 김의 성장을 촉진함과 동시에 잡균, 잡조(파래, 규조등)의 중식도 촉진된다. 김망에 부착된 잡조류를 구제하는 산처리제로서 염산을 사용하는 사례가 있어 해양생태계 뿐만 아니라 김 소비에 나쁜 영향을 끼친다. 정부에서는 염산사용에 따른 어장의 황폐화를 방지하고 양질의 김 생산을 위하여 산 처리제로서 염산 등 무기산에 대체할 수 있는 유기산를 사용하도록 권장하고 있으나 제조공정, 경제성, 현장적용과 효과면에서 여러 가지 문제가 해결되지 않고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.319-320
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• 2001

최근 서해안을 중심으로 한 한반도 주변해역에서 하계에 해파리류가 급증하면서 연안어장 및 생태계에 심각한 영향을 미치고 있는 실정이다. 우리나라 연안에서 우점하는 물해파리(Moon jellyfish: Aurelia aurita)는 전세계적으로 분포하는 종이며, 인체에 해를 미치는 유해한 종은 아니나 멸치와 같은 소형어류의 어장에 막대한 영향을 미치고 있는 실정이다. 물해파리는 소형일 때는 동물플랑크톤 중 요각류나 소형 갑각류를 먹다가 성장하면서 소형어류를 먹는 것으로 밝혀져있다( Purcell, 1985; sullivan et al., 1994). (중략)

• Korean Journal of Environmental Biology
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• v.21 no.2
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• pp.158-163
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• 2003

This study was conducted te evaluate the effect of organotin compounds on rotifer(Brachionus plicatilis), which is important as food organism of aqua-cultured fish and shellfish. To evaluate the texicities of tributyltin compounds such as tributyltin chloride (TBTC), tributyltin oxide (TBTO), tributyltin acetate (TBTA) and tributyltin benzoate (TBTB), and triphenyltin compounds such as triphenyltin chloride (TPTC), triphenyltin fluoride (TPTF), triphenyltin hydroxide (TPTB), the survival rates of rotifer exposed to these compounds were measured as the 96 hr-$LC_{50}$. Exposed concentrations Were from 0.5 to 8 bbp depending on compounds. Based on 96 hr-$LC_{50}$ Value, the Order of toxicity in TBTs was TBTA(1.1 ppb)>TBTC (2.0)>TBTB (3.3)>TBTO(5.6), and that in TPTs was TPTF (1.0)$\geq$TPTC(1.1)>TPTH(1.6). Triphenyltin compounds were slightly higher toxic than tributyltins. The toxicity is likely to depend on alkyl or aryl group other than halogen or the other substituted radicals.

• Journal of the Korean Society for Marine Environment & Energy
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• v.13 no.1
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• pp.30-42
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• 2010

The effects of internal waves on dynamics of hypoxic waters were investigated by numerical simulation by means of a hydrostatic-ecosystem coupled numerical model for Lake Biwa. The numerical model consists of hydrostatic and ecosystem submodels. Numerical simulation was carried out for a period during April 2007 and March 2008, after preliminary numerical simulation for three years. As a result, the numerical model could capture the vertical profiles of the observed water quality. During September 30 and October 21 in 2007, the major internal waves were Kelvin and Poincare waves, the periods of which were 1.63 or 1.77 days and 0.48 days, respectively. Hypoxic waters appeared in bottom boundary layer around October and were still when thermocline locates in upper layer. During late autumn and winter seasons, differences in density between upper and lower layers were reduced and the amplitude of internal waves increased. Hypoxic waters began to move under the effects of internal waves. Movement of hypoxic waters will diminish the habitat for aquatic organisms in deeper waters.

• 한국해양학회지
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• v.14 no.1
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• pp.6-14
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• 1979

Monthly observations of phytoplankton and physico-chemical properties of sea water were made from October, 1977 to December, 1977 and from June, 1978 to August, 1978 at four stations in Cheonsu Bay. 141 taxa of phytoplankton(diatoms and dinoflagellates) representing 17 families, 40 genera have been identified in this study, and 11 taxa of the number are found to be new to Korea. Nitzschia longissima, Coscinodiscus occulus-iridis, Biddulphia sinensis, were the major species in the phytoplankton communities of the Bay. Leptocylindrus danicus, which was one of the dominant species in June, 1978, showed a distinct pattern of distribution;in June its abundance varied from 89.05% to 1.67% of total abundance along 4 stations. During summer months phytoplankton standing crops were ranged between 25,492 and 129,459 cells/l and the values of species diversity index (H) varied from 0.648 to 3.597. A brief taxonomic account is given.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.24 no.3
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• pp.400-421
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• 2019

This study was conducted to find out the seasonal distribution characteristics of meiobenthic communities to understand the benthic ecosystem of Gwangyang Bay, one of the representative bays in the southern coast of Korea. The faunal sampling was conducted eight times seasonally at 20 stations from 2010 to 2011. Among the meiobenthic fauna that appeared during the study period, the nematodes and harpacticoids were the most dominant. In the summer of 2011, the lowest density ($13ind.10m^{-2}$) was seen at station 10 on the inner part of the bay. In the winter of 2011, the highest density ($3,109ind.10m^{-2}$) was seen at station 4 on the inner part of the bay. Although the trend of seasonal changes in density was not clear, the meiobenthic community was seen to be affected more by the environmental factors in each season. Particularly, while the density of the harpacticoids, a dominant faunal group, showed negative correlations with the organic content and average particle size in the summer sediments (p<0.05, p<0.01), the density of the nematodes showed no significant correlation with the environmental factors except with the winter average particle size and the bottom layer's water temperature. The density change of meiobenthos showed irregular changes in Gwangyang Bay, instead of a general trend showing a low density in winter due to low water temperature but an increased density in spring and summer when the water temperature rises and a decreased one again in fall. Considering such a seasonal trend, it seems that the benthic ecosystem of Gwangyang Bay is affected more by artificial environmental factors than by natural environmental ones.

• Journal of the Korean Society of Marine Environment & Safety
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• v.12 no.3 s.26
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• pp.179-183
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• 2006

$CO_2$ impacts on marine ecosystems must be elucidated before implementation of $CO_2$ ocean sequestration. This study was performed for the purpose of applying the use of a cephalopod, Octopus vulgaris to the evaluation of $CO_2$ impacts on marine organisms. 1) 5.25% $MgCl_2\;6H_2O$ is an effective anaesthetic for octopus. 2) Cannula implantation into the abdominal aorta is effective for octopus. 3) A restraint chamber made out of the plastic net is suitable to permit the exit of cannula from the body.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.1
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• pp.9-17
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• 2015

In order to elucidate the current state of marine pollution of heavy metals around major shipyards in Korea, seawater samples were collected at eleven sampling stations and four control stations around 4 major shipyards located in the southeastern coast of Korea in summer 2010, and 6 kinds of metals such as copper(Cu), zinc(Zn), iron(Fe), cadmium(Cd), lead(Pb) and mercury(Hg) in seawater samples were analyzed. The analyses of heavy metals in seawater showed that the mean Cu concentrations in seawater around 4 major shipyards were in the range of $0.817{\sim}1.638{\mu}g/L$ which were lower than Korean environmental standards of $20{\mu}g/L$ for the protection of human health(PHH) and of $3{\mu}g/L$ for short-term protection of marine ecosystem(SPME) but higher than Cu concentration at control station by a factor of up to 2.75. The mean Zn concentrations were in the range of $0.228{\sim}0.567{\mu}g/L$ which were lower than Korean environmental standards of $100{\mu}g/L$ for PHH and $34{\mu}g/L$ for SPME but higher than Zn concentration at control station by a factor of up to 5.91. The mean Fe concentrations were in the range of $3.332{\sim}7.410{\mu}g/L$ which were higher than Fe concentration at control station by a factor of up to 6.75. The mean Cd concentrations were in the range of $0.013{\sim}0.028{\mu}g/L$ which were lower than Korean environmental standards of $10{\mu}g/L$ for PHH and $19{\mu}g/L$ for SPME but higher than Cd concentration at control station by a factor of up to 2.33. The mean Pb concentrations were in the range of $0.007{\sim}0.126{\mu}g/L$ which were lower than Korean environmental standards of $50{\mu}g/L$ for PHH and $7.6{\mu}g/L$ for SPME. The mean Hg concentrations were in the range of $0.002{\sim}0.004{\mu}g/L$ which were lower than Korean environmental standards of $0.5{\mu}g/L$ for PHH and $1.8{\mu}g/L$ for SPME. Although the concentrations of metals such as Cu, Zn and Fe which were used in shipbuilding works were lower than Korean environmental standards for PHH and SPME, the fact that the concentrations of Cu, Zn and Fe at sampling stations around major shipyards were higher than those at control stations implies that the works in shipyards had some effects on marine water quality around shipyards. Therefore, marine environment management such as the prevention and control of the discharge of various pollutants from shipyards is required on national level.

• Proceedings of the Korea Society of Environmental Biology Conference
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• 2002.11a
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• pp.9-14
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• 2002

우리나라의 남해안과 서해안과 같이 해안선의 굴곡이 많고 강의 하류 부분에 위치한 연안 해양은 육지로부터 영향을 가장 많이 받는다. 강 하류에 위치한 항만은 이 지역을 중심으로 발달한 도시와 각종 산업시설과 대규모 부두 시설에 의해 직접 오염물질이 유입되고, 반 폐쇄적인 지리적인 조건으로 오염 물질의 외부 확산이 적게 일어남으로써 각종 유해 오염물질의 최종 종착지이자 오염물질의 보유고 역할을 하고 있다. 본 과제의 주요 목표는 오염지역의 오염물 이동 및 생태계 구조 변화에 관한 종합적 분석을 통해 오염우심해역 관리를 위한 오염과 생태환경에 대한 종합적인 지침서 (오염물 분포, 이동, 순환 등) 제시하고, 오염물질의 순환과정에서 수생-저서생태계의 연계성 규명하며, 더 나아가서 국가실천계획 (NPA) 이행을 위한 기반 확립이다. 본 연구과제의 결과는 항상 오염에 노출될 가능성이 높은 연안역관리를 위한 지표자료를 제공하며, 앞으로 국제적으로 규제될 각종 유기오염물질관리를 위한 자료로 활용될 것이다.