• Journal of Korean Society on Water Environment
• /
• v.28 no.6
• /
• pp.796-803
• /
• 2012

Potential feasibility of nutrients removal and biofuel production with microalgae was evaluated in batch culture. Distribution of microalgae in fresh water including reservoir and river was investigated to search for the species with high content of lipid that could converted into biofuel. Green algae, Chlorella and Scenedesmus sp., these are known as species containing high lipid content for biodiesel production, were observed in both summer and autumn season. However another highly lipid-containing species, botryococcus sp. was not observed in this study. In mixed culture of microalgae using synthesized wastewater medium, green algae were found to be dominant, comparing to other species of diatoms and blue-green algae. And microalgae were also capable of removing nitrogen and phosphorus in batch experiments. During the culture period of 14 days, removal efficiencies of nitrate and phosphorus were 30% and 82%, respectively. Furthermore, content of the intracellular lipid extracted from algae cell was as favorable as 12-30% in the mixed culture where Scenedesmus and Chlorella sp. were dominant. Therefore the mixed culture of microalgae could be applied to biofuel production and tertiary wastewater treatment, even though there are economic barriers to overcome.

• Korean Journal of Ecology and Environment
• /
• v.38 no.1 s.110
• /
• pp.63-72
• /
• 2005

The fish fauna and community structure were investigated in the Lake Cheongpyeong, Korea, from August 2003 to April 2004. During the period, 43 species belonging 10 families were collected. There were 18 Korean endemic species 41.9%. The five dominant species numerically were A. gracilis (17.4%), Zacco platypus (14.6%), A. yamatsutae (13.2%), Hemibarbus labeo (11.9%), Rhinogobius brunneus (11.7%), and Zacco temmicki (3.0%). The five dominant species in biomass were Erythroculter erythropterus (15.07 kg), H. labeo (13.21 kg), Carassius cuvieri (6.47 kg), A. gracilis (6.05 kg), and Z. platypus (4.71 kg). Of 6 exotic fishes in the lake C. cuvieri, Lepomis macrochirus and Micropterus salmoides were originated from foreign countries but Anguilla japonica, Tridentiger brevispinis, and Chaenogobius urotaenius were introduced from other watershed in Korea.

• Korean Journal of Ecology and Environment
• /
• v.35 no.2 s.98
• /
• pp.103-110
• /
• 2002

Seasonal changes of the phytoplankton community was investigated from July 2000 to April 2001 at the river bed lake, Jangjwa Lake in the Imjin River, which appeared to be the most natural condition. A total of phytoplankton were composed of 112 taxa, belonging to 5 divisions,83 species, 10 varieties,1 variety-form, 1 form and 17 unidentified species. Of those, the green algae and the diatoms were present during the investigation periods more frequently then the other taxa. The phytoplantton standing crops varied from $2,943{\times}10^3\;cells/l$ on April 2001 to $5,742{\times}10^3\;cells/l$ on January 2001. The phytoplankton standing crops had a continuous high value over $3,000{\times}10^3\;cells/l$ during the investigated periods and showed the highest value during winter period. The major dominant species were Aulacoseira granulata, Chlamydomonas nivalis v. kobayasii, Dinobryon sertularia, Mougeotia so. and Uroglenopsis americana. Among those, Chlamydomonas nivalis v. kobayasii was a major dominant species during winter period.

• Korean Journal of Environment and Ecology
• /
• v.21 no.3
• /
• pp.235-242
• /
• 2007

In order to find out the current situation of the fauna of the mammals which inhabit Hallasan National Park, the areas of Seongpanak, Eorimok, Gwaneumsa, Yeongsil and Donnaeko were surveyed. The survey was conducted from April 2006 to January 2007 The analysis of geographical distribution revealed that there are 15 species of mammals, which belong to eight families and five orders, in which Apodemus chejuensis, Carpreolus pygargus tianschanicns, Rhinolophus ferrumequinum and Tamias sibiriricus barberi were found to be dominant species. It was also found that there exists the fauna of mammals in Mt. Halla such as Mustela sibirica quelpartis, Crocidura dsinezmi quelpartis, Micromys minutus hertigi and Sorex caecutiens hallamontanus, showing a bio-geological attribute that territorial population of taxologically geographical subspecies class exists. The fauna of the mammals in Jeju Island is rather simpler in its species composition in comparison with the inland of the Korean Peninsula ever since Jeju Island's geographical isolation from the mainland, mainly consisting of Chiroptera and small rodents.

• Journal of The Korean Society of Grassland and Forage Science
• /
• v.4 no.2
• /
• pp.108-114
• /
• 1983

This study was conducted to investigate the effects of existing vegetation on seedling establishment and herbage production of oversown grasses in the Pinus rigida forest. The dominant existing vegetations were Miscanthus sinensis, Festuca ovina, and Lycopodium serratum. In establishment year, seedling stands and herbage production were not affected in Miscanthus sinensis and Festuca ovina, while in Lycopodium serratum it was affected relatively seriously. The pattern of sown species response to the existing vegetations was trend to toward simplified two or three species as Dactylis glomerata, Lolium perenne, and Trifolium repens to advancing the time. Among sown species, Dactylis glomerata was a major dominant species in all existing vegetation area. The content of sown pasture grasses in the sward increased markedly, while the existing vegetations before seeding seriously decreased to advancing the cutting time. The above results shown that the improvement of forest pasture with a surface seeding was better in Miscanthus sinensis and Festuca ovina, but in Lycopodium serratum was found very difficult to improvement of pasture without surface treatment, also establishment method must favor the low herbage production potential.

• Ecology and Resilient Infrastructure
• /
• v.6 no.3
• /
• pp.145-153
• /
• 2019

The present study performed the impact of the change of low-flow channel on aquatic habitat in a reach of the Wonju-cheon Stream, Korea. The target species was Zacco platypus, a dominant species in the middle- and upper-stream of Wonju Cheon. The River2D model was used for the computation of the flow and the habitat suitability index model was used to estimate the quantity and quality of fish habitat using habitat suitability curves. First, for the restoration to low-flow channel, the restoration was conducted in a form close-to-nature flow channel, and the width of the low-flow channel was expanded and reduced. The results indicated that the Weighted Usable Area (WUA) of the target species improved by about 72% when the width of the low-flow channel was expanded, and that the fish habitat decreased by about 25% when the width of the low-flow channel was reduced.

• Ecology and Resilient Infrastructure
• /
• v.6 no.1
• /
• pp.58-68
• /
• 2019

This present study conducted the impact of the restoration of low-flow channel on fish habitat in a reach of the Wonju Stream, Korea. The target species were Zacco koreanus, a dominant species in the middle- and upper-stream of Wonju Stream. The River2D model was used for the computation of the flow and the habitat suitability index model was used to estimate the quantity and quality of fish habitat using habitat suitability curves. In order to restore the study area, the low-flow channel was identified through the bankfull discharge of the study reach, and the best hydraulic section was designed. In addition, various restoration techniques were applied to the low-flow channel through rocks, pool/riffle structures, and the change of the channel width. Simulation results indicated that the restoration of the best hydraulic section effects decreased habitat suitability for the target species. However, when various restoration techniques were applied, the WUA (Weighted Usable Area) was improved by about 11%.

• Journal of Wetlands Research
• /
• v.24 no.4
• /
• pp.312-319
• /
• 2022

The species diversity of plant communities is quantitatively measured, and can be affected by plant monitoring methods. This study experimentally compared the structure and diversity of plant communities living in five waterfront park areas in Nak-dong River using three plant survey methods (modified Whittaker, modified Daubenmire, and modified point-line intercept method). According to the diversity profile, the modified Whittaker method produced the highest species richness regardless of the location, but which method makes the highest diversity of dominant species varies depending on the location. The Beta diversity of the communites calculated from the modified Whittaker and the modified Daubenmire suggested that structures of plant communities in five locations were similar, while the Point-line interception method suggested that a small number of dominant species were shared between communities.

• Journal of Marine Bioscience and Biotechnology
• /
• v.14 no.2
• /
• pp.102-111
• /
• 2022

Beakryoung-do is located in the north along the western coast of South Korea. Owing to its geographical limitations, not many studies have been conducted on marine algae in this region. This study aims to investigate the marine algal flora and the community structure in the intertidal and subtidal zones of Nampo-ri, Beakryoung-myeon, Ongin-gun, Incheon regions of South Korea. The study was conducted from August 2015 to June 2016 during all seasons. A total of 95 algal species, including 7 green algae, 12 brown algae, and 76 red algae were collected and identified; 52 algal species were found in the intertidal zone and 83 in the subtidal zone. The vertical distribution of algae from upper to lower intertidal zone was Neorhodomela aculeata - Caulacanthus okamurae, Gelidiophycus freshwateri - Neorhodomela aculeata, Caulacanthus okamurae - Sargassum thunbergii, Caulacanthus okamurae. Findings indicated that Sargassum thunbergii and Neorhodomela aculeata were the biomass-dominant species in the intertidal zone and Corallina officinalis and Undaria pinnatifida were biomass-dominant in the subtidal zone. Average values of marine algae biomass in the intertidal and subtidal zones were 252.6 g wet weight m^-2 and 291.9 g wet weight m^-2, respectively. Further, 38 new species were found in Beakryoung-do, with 25 of them specifically found in the subtidal zone. More studies on marine algal flora in the subtidal zone are needed to understand the changes in marine flora along the western coast.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.15 no.2
• /
• pp.68-71
• /
• 2010

This study was performed in order to obtain basic data of macrobenthic community in continental shelf exclusive economic zone (EEZ), before sand excavation. The species number of macrozoobenthos was 157, mean density was 2,529 ind./$m^2$ and mean biomass was 231.8 $g/m^2$ in November, 2000. The species number of macrozoobenthos was 179, mean density was 3,773 ind./$m^2$ and mean biomass was 391.2$g/m^2$ in February, 2001. Dominant species were Ampelisca sp. and Photis sp. in amphipods, Ophiactis branchygenys in ophiuroids and Nothria sp. and Eunice sp. in polychaetes. In the proportion of feeding types of macrobenthos, surface deposit feeders were most dominant feeding group, and followed by carnivores, subsurface deposit feeders, and filter feeders. Species diversity index (H') was high ranging from 2.5 to 3.5 at most sites.