• Ocean and Polar Research
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• 제40권2호
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• pp.59-67
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• 2018

This study was conducted to understand the distribution and changes of macrobenthos on rocky intertidal areas around Taean thermoelectric power plant, Also, the purpose of this study was to produce a base-line data on the changes in water temperature due to the operation of the power plant and to understand its thermal impact on the macrobenthic community on intertidal rocky bottoms. A field survey was seasonally conducted at 3 rocky intertidal sites around the Taean thermal power plant. There was no seasonal difference in the community parameters such as number of species, mean density, biomass and species diversity during the study period. The major dominant species were Chthamalus challenger, Littorina brevicula, Crassostrea gigas. In comparison with previous study, thermal discharge in the study area did not significantly affect the distribution of dominant species. The structure of the macrobenthic community revealed that there were showed 3 different faunal groups depending on the difference in the mean density of major dominant species. The result of SIMPER analyses to determine which species were the main contributors to the differences between each community, C. challenger, Lottia spp. And Mytilus galloprovincialis, etc., revealed that there was showed a significant difference between each group. The abundance of M. galloprovincialis, showed a significant difference between faunal groups.

• 한국환경보건학회지
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• 제30권4호
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• pp.347-351
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• 2004

A battery of sediment bioassays was performed for the sediments from the intertidal flat zone along the middle west coast of Korea to assess their potential toxicity. In the bioassays, three crustaceans, Daphnia magna, Nitocra spines, and Hyalella aztec a were exposed to $16\%$ sediments (wet weight) collected from 14 sites. Immobility($\%$) was checked as an endpoint after 24- and 48-h exposure of Daphnia magna and after 96-h exposure of Hyalella azteca and Nitocra spines. Among the three bioassays, the 48-h Daphnia bioassay showed the most distinct differential sensitivity in relation to sediment contamination, while the Nitocra and the Hyalella bioassays failed to show the differential sensitivity properly among the sites classified as polluted. Significantly different levels of immobility ($\%$) were obtained between the sites classified as chemical/nutrient polluted and the sites classified as non-polluted in the Daphnia bioassays, but not in the Nitocra bioassay and the Hyalella bioassay. Some differences of toxic response to the same sediments among bioassays were observed, suggesting that there may be a chemical specificity of response sensitivity to sediment toxicity, due to differences in bio-availability of sediment toxicants among test species.

• 한국해안해양공학회지
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• 제18권1호
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• pp.63-68
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• 2006

조석 주기 동안에 시간에 따라 위치가 변하는 수륙 경계선은 조간대 지형을 측정하는 보조 자료로 활용될 수 있다. 즉 밀물 시 연속적으로 촬영된 영상으로부터 추출된 수륙경계선의 표고는 해수면 변화 자료를 이용하여 등심선으로 이용할 수 있으며 등심선의 수평거리는 영상 기하보정 처리를 통하여 정량적인 값으로 변환할 수 있다. 이러한 관측 기술을 서해안의 대이작도 큰풀안 백사장에 적용하였다. 조간대에서의 자연적인 수위변화를 이용하는 영상 관측 기법은 정확도가 높으며 또한 시간과 경제적인 측면에서 유리하다. 이러한 기술은 3차원 수조에서 연안지형 변화를 연구하는 물리모형 실험에서 시간별 지형 변화를 관측하는데 효과적으로 사용될 수 있다.

• ALGAE
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• 제22권1호
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• pp.17-21
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• 2007

Sargassum filicinum Harvey, a brown alga (Phaeophyceae) native to Northeastern Asia, has been recently reported from the coast of Southern California (USA). Here we report the occurrence and range extension of this introduced species, as we found the alga at La Jolla and Rancho Packard in Todos Santos Bay, Baja California, Mexico. The first collections of S. filicinum correspond to several immature plants, found on September 8, 2005, drifting in the intertidal zone at La Jolla. Later on November 9, 2006, we found a well-established population in Rancho Packard in the middle intertidal zone to 2 m depth. Since S. filicinum is an annual monoecious species with air bladders, the risk there is a high risk of spreading rapidly along the Pacific, as in the case for S. muticum. The population in Rancho Packard extends 500 m along the coast, consisting mainly of young plants with an average length of 30 cm and a density of 5 thallus/m2. This is the first record of this invasive species for the Mexican Pacific coast, and it represents the southern limit along the Pacific coast of North America. This finding suggests that this invasive species has successfully colonized the Pacific coast of North America and its distributional range is still expanding.

• 한국수산과학회지
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• 제44권1호
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• pp.85-94
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• 2011

The species composition and distributions of benthic marine plants on the East Coast of Korea were studied. We examined all species found in the intertidal and subtidal zones at four sites seasonally from August 2006 to May 2009. Of the 148 species identified, 92 were rhodophytes, 39 were phaeophytes, 16 were chlorophytes, and 1 was a seagrass. The most species (125) were found at Jukbyeon, while the fewest (99) were found at Chuksan. Overall, the numbers of species were highest during the spring and lowest in autumn. Seventy-five species (50 rhodophytes, 15 phaeophytes, 9 chlorophytes, and 1 seagrass) were found at all four sites. The dominant species providing cover were melobesioidean algae, Sargassum spp., Phyllospadix japonica, and Corallina pilulifera. The vertical distribution of benthic marine plants was characterized by C. pilulifera, Sargassum spp., Hizikia fusiformis, Grateloupia elliptica, Symphyocladia latiuscula, Grateloupia lanceolata, Ulva pertusa, and Chondria crassicaulis in the intertidal zone; Sargassum spp., P. japonica, Prionitis cornea, C. pilulifera, and Acrosorium polyneurum at 1 m depth; Sargassum spp., P. japonica, and melobesioidean algae at 5 m depth; and melobesioidean algae at 10 m depth. There was variation among the sites, presumably due to differences in the local conditions.

• ALGAE
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• 제24권1호
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• pp.31-38
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• 2009

The brown algae padina concrescens is widely distributed in the northwestern Pacific Mexico. We described the population of P. concrescens based on population parameters such as cover, density and size structure and reproduc-tion at two levels tide at the intertidal area in the southwestern Baja. California Peninsula. Monthly visits from January to December 2003 were done. Both cover and density were measured in situ by quadrants method. Samples were collected to obtain size structure and percentage of reproductive fronds. Our results show there is sparial vari-ation in the population structure more than temporal. Thus, cover and density peak were at different months ineach tide level studied, the lower tide level shows the high values in cover as well as density. The frond develop-ment was observed in height/width ratio this relation was consistent only in the low tidal zone. Size class distribu-tion has consistently small size plants in both tide levels.Reproduction was seasonal in the tide channel but in both tide levels all the reproductive plants were tetrasporophyte. Our results suggest that this population is pseudopere-nial and it strongly as a consequence of the intense competition in the intertidal zone.

• 환경생물
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• 제25권4호
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• pp.297-302
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• 2007

태안연안 국립공원의 조간대에 서식하는 어종과 어류분포 특성을 알아보기 위해 2005년 3월부터 10월 사이에 족대와 뜰망을 이용하여 어류를 채집하였다. 연구기간 동안 모두 8목 15과 27종의 어류가 채집되었다. 모래로 이루어진 백사장의 조수웅덩이에서는 망둑어과의 날개망둑이 우점종이었고, 자갈이 깔린 바닥에는 미끈망둑이 주로 서식하였다. 바위와 암벽으로 이루어진 조수웅덩이에는 우베도라치를 포함한 베도라치류와 망둑어과의 별망둑, 점망둑이 우점하였다. 한편 채집된 어류 가운데 한국 고유종은 우베도라치와 참돛양태 2종이었으며, 2002년 태안군 소원면 모항리에서 채집되어 신종으로 보고된 바 있는 둑중개과의 고려실횟대는 금번 연구에서 채집되지 않았다. 이것은 주변에서 이루어진 모항항 공사가 이들의 서식처에 영향을 미쳤기 때문으로 판단된다.

• The Korean Journal of Ecology
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• 제24권5호
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• pp.297-301
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• 2001

광양만 조간대 주요 10지점과 청정해역으로 알려진 남해와 고흥 2곳의 대조구를 선정하여 퇴적토의 중금속(As, Pb, Cd, Hg)과 바지락(R. Philippinarum) 근육조직내 중금속(As, Pb, Cd Hg) 농도분포를 조사하였다. 전체적으로 여천공단 연안지역(SY-지점 G, H, 1, J)의 퇴적토내 중금속함량은 광양제철소 인접 연안지역(SP-지점 A, B, C)의 값보다 유의하게 높았으며, 이는 여천공단 지역의 장기적이고도 활발한 연안 산업활동 때문인 것으로 판단된다. 또한 광양제철소 인접 연안지역의 중금속 함량은 대조구 지역(CS)의 그것과 통계적으로 유의한 차이가 없었다. 광양만 연안과 대조구 지역에서 채취한 바지락 생체조직 내 중금속 함량은 전 지점에서 검출되지 않은 Hg를 제외하고, As가 1.32±0.92∼3.65±0.10, Pb이 0.69 ±0.52∼2.49±0.57, Cd이 0.07±0.07∼0.31±0.05(㎎/㎏, FW)이었다. 바지락 생체조직 내 중금속 함량을 4개의 지역으로 나누어 비교했을 때 여천공단 지역(지점 G, H, I, J)과 대조구 지역(지점 K L)의 값이 다른 두 지역(광양제철소 인접 연안지역과 광양시 호안보다 유의하게 높게 나타났지만, 전체적으로 조간대 퇴적토과 그곳에 서식하는 바지락 근육조직간의 중금속(As, Pb, Cd) 분포는 유의한 상관성을 보이지 않았다.

• 한국항만학회지
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• 제12권1호
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• pp.105-111
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• 1998

A horizontal 2-D model which includes the wetting-drying treatment technique in the intertidal zone is applied for the prediction of tidal changes. The flow model is applied to Mokpo coastal zone and verified by measurement data. Comparing computation results with observed values for the M2 tidal constituent, agreeable correspondence is detected. The validity of the model is also proven by applying it to such areas which have narrow width and rapid velocity, irregular topography and complex geometry. Thus, this model can be used as the compatible prediction model for the tidal change and pollutant transport due to the development of Mokpo coastal zone.

• Journal of Ecology and Environment
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• 제37권4호
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• pp.245-255
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• 2014

To collect the diatom species belonging to the genus Hantzschia, bottom sediments were collected from 32 sampling sites in 23 sand-flat areas in the intertidal zone and river reaches of Nakdong River estuary, Korea. The sand sediments contained a total of 19 species of genus Hantzschia, Hantzschia amphioxys (Ehrenberg) Grunow, H. amphioxys f. capitata O. Muller, H. baltica Simonsen, H. distinctepunctata (Hustedt) Hustedt, H. elegantula (Østrup) Witkowski et al., H. longiareolata Garcia-Baptista, H. marina (Donkin) Grunow, H. pseudomarina Hustedt, H. virgata (Roper) Grunow, H. virgata var. gracilis Hustedt, H. virgata var. kariana Grunow, H. virgata var. leptocephala Østrup and H. weyprechtii Grunow, including six unconfirmed species. Eleven Hantzschia species are reported as new to Korea. Hantzschia virgata, its infraspecies, and neighboring speceis showed large morphological variations within a single species or among the closely related species. Hantzschia amphioxys, H. distinctepunctata, and H. virgata var. leptocephala prefer freshwater habitats in the upper reaches of the river, while others occurred mainly in the sand flats composed of coarse sand in the intertidal area. In the estuarine sediments, the Hantzschia taxa are classified to be typical sand-attached forms.