• 한국습지학회지
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• 제20권1호
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• pp.1-13
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• 2018

갯봄맞이는 한국에서 매우 제한적인 분포를 보여 멸종위기종으로 지정 보호되고 있다. 본 연구는 갯봄맞이의 남방한계지역에 해당하는 당사해안습지의 식생 다양성을 확인하고 식생결정 요인과 서식처 중요성을 평가하는데 목적을 두고 있다. 식생분류를 위해 Z.-M. 학파의 식물사회학적 방법을 활용하였으며, 환경요인과 식생과의 관계 분석을 위해 수리통계분석을 수행하였다. 연구결과 당사해안습지는 갯봄맞이-지채군락 (3개 하위군락), 갯꾸러미풀s.l.군락, 기장대 풀군락, 갈대-꼬마부들군락의 4개 단위식생으로 구성되어 있었다. 이들 식생의 주요 결정요인은 수분환경과 토심, 수위교란정도, 식생고, 군락구조 등인 것으로 확인되었다. 갯봄맞이는 갯봄맞이-지채군락의 전형아군집에서 가장 우세하게 생육하는 것으로 확인되었으며, 인접한 일본의 남방한계지역과도 유사한 종조성 및 우점상황을 보이는 것으로 나타났다. 당사해안습지는 식물지리 및 식생지리학적 측면에서 큰 의미를 지니는 입지이며, 다양한 종의 피난처로서 기여하고 있는 것으로 평가되었다. 당사해안습지의 가치를 다양한 관점에서 정밀하게 파악하고 보호 및 관리하기 위한 보전전략의 수립이 요구된다.

• 환경생물
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• 제37권1호
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• pp.31-41
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• 2019

남해안에서 분리한 Gymnodinium catenatum의 형태, 계통학적 분석 및 다양한 온도 및 염분에 반응하는 성장 조건을 파악하였다. G. catenatum의 세포는 세로로 길거나 세로와 가로의 길이가 유사한 오각형이었다. 세포의 길이는 $38.1{\sim}77.4{\mu}m$, 폭은 $26.1{\sim}40.8{\mu}m$로 나타났다. 핵은 세포의 중간에 위치하였고, 상추구는 말굽의 편자 모양이었고, 이는 국내외 배양주와 형태적으로 매우 유사한 결과 였다. 계통분석 결과도 염기유사도를 비교해 보았을 때, 기존에 보고된 배양주와 100% 일치하여 이 종은 단일 계통으로 판단되었다. 온도와 염분에 대한 성장실험에서 G. catenatum은 $15^{\circ}C$ 이상의 온도에서 염분 15 psu를 제외한 모든 염분구간에서 성장을 보였으며, 고온인 $30^{\circ}C$에서는 성장을 하지 않았다. 최대성장속도는 온도 $25^{\circ}C$, 염분 35 psu에서 $0.37day^{-1}$로 나타났고 최대세포밀도는 온도 $20^{\circ}C$, 염분 25에서 $1,073cells\;mL^{-1}$였다. 이 결과는 G. catenatum이 한국 남해안에서 여름철 및 가을철, 특히 평균 수온이 $20^{\circ}C$ 이상인 여름철에 최대 증식을 보일 수 있다는 것을 나타낸다.

• 한국패류학회지
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• 제7권1호
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• pp.58-65
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• 1991

A study on the distribution and community structure of the benthic molluscan shells of the southern coastral area in Cheju Island was carried out from August 1990 to July 1991. The benthic molluscan shells collected and identified from 8 stations were composed of 3 classes, 7 orders, 22 families and 59 species. The number of appearance species from station 1 to station 8 were 22, 35, 32, 26, 28, 24, 32 and 31 species respectively. the first dominant species of the upper intertidal zone of the 8 stations were Nodilittorina exigua, those of the middle zones were Monodonta neritoides from st.1 to St.5, but the second dominant species were not uniftom at ach station.

• 환경생물
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• 제31권4호
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• pp.493-498
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• 2013

To investigate the historical record of Alexandrium spp. in southern coastal areas of Korea, two sediment cores were collected from Gamak Bay and Yeoja Bay. Germination experiments revealed that the ellipsoidal Alexandrium cysts isolated from Gamak Bay and Yeoja Bay are morphologically identical to a toxic dinoflagellate A. tamarense. The ellipsoidal Alexandrium cysts in Yeoja Bay appeared from 30 to 32 cm depth upwards (ca. 1980s), and their concentration increased around 10 to 12 cm depth (mid-1990s). Similarly, cyst concentration in Gamak Bay also increased from 40 to 44 cm depth (ca. 1990s). These results coincide with the reports of Paralytic Shellfish Poisoning caused by A. tamarense in 1980s and 1990s along the southeast coast of Korea.

• Ocean and Polar Research
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• 제26권1호
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• pp.11-22
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• 2004

Benthic pollution assessment based on macrobenthic community structure with environmental variables was carried out at twelve stations during two periods on a presumed pollution gradient in Gamak Bay. Univariate and multivariate methods were applied to investigate structural changes in the benthic communities. A clear gradient of pollution effects on the macrobenthic community was observed from the interior to the exterior of the bay. The community on the northwestern basin was severely disturbed due to a low level of hydrodynamics and a large amount of pollutant input from nearby cities. Exterior regions on the southern basin appeared to have the best benthic environmental characteristics among all stations according to most methods of analysis. Central ridge regions and two stations around the islets in the mouth of the bay exhibited intermediate levels of perturbation when compared to the more disturbed interior and undisturbed exterior regions. Pollution effects on the communities were attenuated at the southern area of the central ridge during spring compared to those of summer, where aquacultural farming was densely distributed. The environmental variables primarily correlated to the macrobenthic community structure were total organic carbon (C), organochlorine pesticides (OCPs), and tributyltins (TBTs), contents found on the surface sediment, as anthropogenic variables indicating organic materials.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1997년도 추계 국제학술심포지움 논문집
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• pp.97-142
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• 1997

The Seoguipo Formation occurs only in a small exposure along the coast of the Seoguipo City, but in the subsurface, underlies tile western part of the Bugcheon-Pyoseon Line in the northeastern part of tile island. The Bugcheon-Pyoseon Line is presumed to be a facies boundary that reflects tile distribution of hyaloclastites resulted from submarine volcanic activity. The Seoguipo Formation is distributed in the subsurface along the part which is lower than 400m in average altitude, and occurs at El. -5.76∼-46.63m in tile southern area, El. -41.89∼-57.97m in the western area, El. -13.15∼-50.59m in the northern area. Therefore, the southern area was uplifted after the deposition of the Seoguipo Formation. In the subsurface, the vertical depth of the volcanic rocks of the Cheju Volcanic Edifice is El. -40.6m in the southern area, El. -111.3m in the western area, El. -81.5m in the northern area and El. -134.7m in the eastern area. The unconsolidated U Formation, which is, overlying the basement and about 70∼250m thickness underlies the whole island. There is a positive correlation between tile groundwater level and the depth of the subsurface distribution of the Seoguipo Formation. Consequently, it is conformed that the subsurface distribution of the Seoguipo Formation plays important role for controlling the characteristics of the reservoir of tile groundwater in Cheju Island.

• 도시과학
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• 제9권1호
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• pp.41-49
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• 2020

This study analyzed the factors affecting economic growth using multiple regression model and Geographically Weighted Regression in consideration of population, industry and employment, housing and political characteristics on economic growth by region. The analysis results are summarized as follows. First, the total employment growth rate, manufacturing employment growth rate, local election turnout and the level of party consensus between the central and local governments are having a positive impact on regional economic growth. Second, according to the GWR analysis, the population has a positive impact on economic growth in the southern region of Korea, and the increase in the total number of employees has a positive impact on the southern region of Gyeonggi Province, Gangwon Province, North Chungcheong Province and North Gyeongsang Province. Finally, the voter turnout of urbanites is positively affecting economic growth in South Chungcheong Province, Gangwon Province and the southern coast, while North Jeolla and South Jeolla provinces have a positive impact on economic growth as the parties of the central and local governments are equal. The results of this study may suggest the role of local government for regional economic development.

• Ocean and Polar Research
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• 제21권2호
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• pp.137-147
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• 1999

Penguins are one of the key constituent organisms in the Antarctic ecosystem. A total of 18 species of penguins occur only in the southern hemisphere from the Galapagos Archipelago to southern area off Australia and New Zealand, South Africa, South America, and the islands scattered in the Southern Ocean to the coast along the Antarctic Continent. In the Antarctic Treaty area, there are only 5 species of penguins such as Emperor (Aptenodytes forsteri), Gentoo (Pygoscelis papua ellsworthi), Adelie (P. adeliae), Chinstrap (p. antarctica), and Macaroni (Eudyptes chrysolophus) penguins. Two additional species, the King (Aptenodytes patagonicus patagonicus) and Rockhopper (Eudyptes chrysocome) penguins, however, are distributed within the Antarctic Convergence. In the vicinity of king Sejong Station located in King George Island, the South Shetland Islands off the Antarctic Peninsula, 5 species are observed, among which 2 Pygoscelis species such as the Gentoo and Chinstrap penguins hatch their eggs and raise their chicks at the rookery 2km south offing Sejong Station in summer. Adelie penguins hatch their chicks in other place in King George Island. One Emperor penguin roamed on the frozen Maxwell Bay which has been frozen every two or three years with the approximate thickness of 60cm. And one Macaroni penguin also visited the rookery in summer. We should carry out researches on the penguins occurring in the vicinity of King Sejong Station to monitor the environmental changes around King Sejong Station and the South Shetland Islands.

• 해양환경안전학회지
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• 제25권3호
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• pp.328-333
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• 2019

During the winter of 2017/2018, significantly low water temperatures were detected around the western and southern coasts of Korea (WSCK). In this period, sea surface temperature (SST) in the Korea Waters was about $2^{\circ}C$ lower than mean temperature. Using the real-time observation system, we analyzed the temporal variation of SST during this period around the western and southern coasts. Low water temperature usually manifested over a period of about 10 ~ 20 days. The daily Arctic oscillation index was also similarly detectable with the variation of SST. From the cross-correlation function, we compared two periodic variations, which were SST around the WSCK and the Arctic oscillation index. The cross correlation coefficients between both variations were approximately 0.3 ~ 0.4. The time lag of the two time series was about 6 to 7 days. Therefore, significantly low water temperatures during winter in the Korean coastal areas usually became detectable 6 to 7 days after the negative peak of Arctic oscillation.

• 대한토목학회논문집
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• 제28권4A호
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• pp.431-438
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• 2008

본 연구에서는 열대성 저기압에 의하여 지배를 받는 우리나라 서남해안의 풍속을 추정하기 위한 개선된 태풍 몬테카를로 시뮬레이션 방법을 제시하였다. 이를 위하여 적절한 태풍의 물리적 모델을 제시하고 실측치와 비교하여 검증하였다. 아울러 태풍을 구성하는 파라메터의 확률분포 모델을 제시하고 우리나라 인근을 통과한 태풍자료를 사용하여 적합성을 검사하였다. 본 연구의 방법으로 서남해안 주요 지점의 재현기간별 풍속을 추정하여 제시하였는데, 위도가 낮아질수록 풍속이 높아지며, 도로교설계기준의 기본풍속은 과다한 것으로 나타났다.