월성원자력발전소 온배수가 해조류 종조성 및 군집구조에 미치는 영향

최한길,Choi, Han-Gil 한국조류학회(藻類) 2008 ALGAE Vol.23 No.2

Marine algal flora and community structure were seasonally examined at three sites in the vicinity of the Wolseong nuclear power plant in Korea from February to November 2006. A total of 126 seaweeds including 25 green, 31 brown, 70 red algae, and 1 marine plant were identified. The greatest number of species occurred at Jeonchonri (101 species) followed by intake (88 species) and discharge (29 species) during the study period. Of 126 seaweeds, 76 annuals and 13 warm tolerance species were recorded. Dominant species based on important value (IV > 10) were Ulva pertusa and Enteromorpha linza at intake, U. pertusa and Padina arborescens at discharge, and Sargassum horneri and Corallina pilulifera at Jeonchonri shore. Annual average biomass exhibited a wide range of variations, from 40.67g m-2 in dry weight at discharge to 133.69g m-2 at Jeonchonri. Among six functional groups, dominant group was coarsely-branched form at intake and Jeonchonri, but it was different at discharge site as filamentous form. Seaweed community structures of discharge site were distinguishable in decreasing species richness, biomass, species diversity index (H’), richness index (R), and evenness index (J’). Also, the ratios of green algae, warm tolerance species, annual algae, filamentous form and dominance index (DI) remarkably increased. Such phenomenons of discharge site are usually found under environmentally stressful conditions such as high disturbance. Thus, I can conclude that the heated effluents of nuclear power plant act as environmental stress influencing seaweed community structures and it can be detected with various community indices.

한국연안 해조류 생물량의 연간 변동 양상: 전북 외조도와 주삼도 지역

최한길,이기훈,만효금,유현일,박향하,김정하,정익교,Choi, Han-Gil,Lee, Ki-Hun,Wan, Xiao Qin,Yoo, Hyun-Il,Park, Hyang-Ha,Kim, Jeong-Ha,Chung, Ik-Kyo 한국조류학회(藻類) 2008 ALGAE Vol.23 No.4

Seasonal and vertical variations of seaweed biomass were examined at Woejodo and Jusamdo of western sea, Korea from July 2006 to April 2007. Annual seaweed biomass was 198.27 g m$^{-2}$ in wet weight at Woejodo and 417.34 g m$^{-2}$ at Jusamdo, respectively and biomass of intertidal zone was greater than that of subtidal zone at Jusamdo sites. Seaweeds distributed vertically from mid intertidal to 5 m of subtidal zone at Woejodo and from high intertidal to 10m of subtidal zone at Jusamdo. Seaweed biomass and species number were maximal at lower intertidal zone (27 species, 365.43 g m$^{-2}$) of Woejodo and at mid intertidal zone (26 species, 684.18 g m$^{-2}$) of Jusamdo. Seasonal biomass varied from 136.73g m$^{-2}$ in autumn to 249.33 g m$^{-2}$ in winter at Woejodo and from 353.37 g m$^{-2}$ in autumn to 482.07 g m$^{-2}$ in summer at Jusamdo. Dominant species was Sargassum thunbergii showing highest annual biomass (Woejodo, 94.68 g m$^{-2}$ Jusamdo, 228.59 g m$^{-2}$) among all seaweeds and finding at various shore levels during the study period. Subdominant species were Corallina pilulifera and Gracilaria textorii at Woejodo, and were Sargassum fusiformis and Chondria crassicaulis at Jusamdo. Thus, we can conclude that Jusamdo shore is better place than Woejodo based on seaweed biomass and vertical distribution, and S. thunbergii is the representative species of the two islands.

학술발표회 : 7) 해양생물분야 , 포스터발표 ; Interrelation with food and habitat preference of Littorina in upper intertidal tide pools

최한길(Han Gil Choi),김영식(Young Sik Kim),남기완(Ki Wan Nam) 한국국제경제학회 2001 춘계 수산관련학회 공동학술대회발표 요지집 Vol.0 No.-

한국 남서해안 함평만의 월별 해조상 및 군집구조 변화

오병건,최한길,Oh, Byoung-Geon,Choi, Han Gil 한국환경생물학회 2021 환경생물 : 환경생물학회지 Vol.39 No.1

The monthly variability in marine algal flora and community structure was examined in the intertidal zones of Doripo, and the biomass of an edible alga, Ulva prolifera, at Gaip-ri of Hampyong Bay on the southwestern coast of Korea was investigated over one year from April 2008 to March 2009. A total of 22 seaweeds were identified including five green, four brown, and 13 red algae. Based on importance value, Ulva australis was dominant over the year and the subdominant species were Ulva linza and Caulacanthus ustulatus at the Doripo coast of Hampyong Bay. The vertical distribution in terms of importance values was in the order of Ulva linza - C. ustulatus - U. australis - Sargassum thunbergii from the upper to the lower intertidal zones. The biomass of U. prolifera ranged between 2.4-98.2 g dry wt. m^-2, with a maximum in June and a minimal in November. In the field, U. prolifera biomass could be positively related to seawater temperature. However, further research on the association between biomass and other environmental factors such as nutrients and light intensity is required. 2008년 4월부터 2009년 3월까지 1년간 우리나라 서남해안 함평만의 도리포에서는 조간대의 해조류 식물 군집과 가입리에서는 식용 해조류 가시파래의 월별 변동성을 매월 조사하였다. 조사된 해조류는 총 22종이었으며, 녹조류 5종, 갈조류 4종 그리고 홍조류 13종이었다. 함평만 도리포 암반 조간대에서 연간 우점하는 해조류는 구멍갈파래였고, 준 우점종은 잎파래와 애기가시덤불이었다. 조간대 상부에서 하부에 이르는 수직분포는 잎파래 - 애기가시덤불 - 구멍갈파래 - 지충이었다. 가시파래의 생물량은 6월에 최대를 보였고 11월에 최소를 보였으며, 2.4-98.2 g dry wt. m^-2 범위를 나타냈다. 가시파래의 생물량은 수온과 연관이 있어 보이지만 영양염류 및 빛의 강도 같은 기타 환경요인과의 관계는 추후 지속적인 연구가 요구된다.

태안반도 꽃지 약용해조의 계절적 군집구조 및 수직분포

이기훈,유현일,최한길,Lee, Ki-Hun,Yoo, Hyun-Il,Choi, Han-Gil 한국조류학회(藻類) 2007 ALGAE Vol.22 No.3

Marine algal flora and community structure of medicinal seaweeds were examined at Kkotji of Taean Peninsula, Korea from May 2005 to January 2006. Seventy-nine seaweeds including 42 medicinal algae and one marine plant were identified. Sargassum thunbergii was the representative alga occurred at all seasons and shore levels. The dominant medicinal seaweeds were perennial S. thunbergii, Neorhodomela aculeata, and Corallina pilulifera, and ephemeral Monostroma grevillei, Porphyra yezoensis, and Ulva pertusa. Their vertical distribution were N. aculeata ? P. yezoensis, M. grevillei, and U. pertusa ? C. pilulifera from high to low intertidal zone. The average biomass of medicinal seaweeds varied from 34.17 g m?2 in spring to 56.41 g m?2 in summer. At Kkotji shore, the opportunistic species (Enteromorpha, Ulva, and Cladophora) and turf-forming algae (Caulacanthus okamurae and Gelidium divaricatum) were easily observed. Such fast growing ESG II (ecological state group) was 87.50% and slow growing perennial algae, ESG I was only 12.15%. Also, diversity index (H’) and dominance index (DI) indicate that the seaweed community of Kkotji is unstable. Therefore, Kkotji rocky shore should be more protected from human activities such as turbulence and eutrophication in order to maintain species diversity and abundance of medicinal seaweeds.

갈조류 감태(Ecklonia cava)의 포자체와 배우체 생장에 영향을 주는 수온과 pCO₂ 농도의 상호작용

오지철,유옥환,최한길,Oh, Ji Chul,Yu, Ok Hwan,Choi, Han Gil 한국해양과학기술원 2015 Ocean and Polar Research Vol.37 No.3

To examine the effects of increased $CO_2$ concentration and seawater temperature on the photosynthesis and growth of forest forming Ecklonia cava (Laminariales, Phaeophyta), sporophytic discs and gametophytes were cultured under three $pCO_2$ concentrations (380, 750, 1000 ppm), four temperatures (5, 10, 15, $20^{\circ}C$ for sporophytes; 10, 15, 20, $25^{\circ}C$ for gametophytes), and two irradiance levels (40, $80{\mu}mol$ photons $m^{-2}s^{-1}$) for 5 days. Photosynthetic parameter values ($ETR_{max}$, $E_k$, and ${\alpha}$) were generally higher as sporophytic discs were grown under low temperature and increased $CO_2$ concentration at 750 ppm. However, photosynthesis of Ecklonia sporophytes was severely inhibited under a combination of high temperature ($20^{\circ}C$) and 1000 ppm $CO_2$ concentration at the two photon irradiance levels. The growth of gametophytes was maximal at the combination of 380 ppm (present seawater $CO_2$ concentration) and $25^{\circ}C$. Minimal growth of gametophytes occurred at enriched $pCO_2$ concentration levels (750, 1000 ppm) and high temperature of $25^{\circ}C$. The present results imply that climate change which is increasing seawater temperature and $pCO_2$ concentration might diminish Ecklonia cava kelp beds because of a reduction in recruitments caused by the growth inhibition of gametophytes at high $pCO_2$ concentration. In addition, the effects of increased temperature and $pCO_2$ concentration were different between generations - revealing an enhancement in the photosynthesis of sporophytes and a reduction in the growth of gametophytes.

94 GHz SiGe BiCMOS PLL의 고온 특성 평가 및 분석

이상흥(Sang-Heung Lee),최한길(Han-Gil Choi),이주호(Ju-Ho Lee),정규채(Kyu-Chae Jung),조성환(Seong-Hwan Cho) 한국전자파학회 2023 한국전자파학회논문지 Vol.34 No.10

한국 남서해안 관매도와 영산도의 해조상 및 군집구조

한수진 ( Su Jin Han ),전다빈 ( Da Vine Jeon ),이정록 ( Jung Rok Lee ),나연주 ( Yeon Ju Na ),박서경 ( Seo Kyoung Park ),최한길 ( Han Gil Choi ) 한국수산과학회 2016 한국수산과학회지 Vol.49 No.1

Seasonal variations in seaweed communities were examined at Gwanmaedo and Yeongsando, Korea, from May 2014 to February 2015. Eighty-nine species were identified, including 11 green, 20 brown and 58 red algae. Seventy-three and 74 species were identified at Gwanmaedo and at Yeongsando, respectively. Sargassum thunbergii and Myelophycus simplex were the dominant species, comprising 60.89 and 39.50% of total biomass, respectively, and S. fusiforme was subdominant at the two sites. Of six functional seaweed forms, the coarsely-branched form was the most dominant, forming about 43% of the species number at Gwanmaedo and Yeongsando. Seasonal seaweed biomasses ranged between 53.10 and 172.85 g/m2 (average 93.57 g dry wt./m2) and between 83.11 and 176.20 g (138.21 g/m2) at Gwanmaedo and Yeongsando, respectively. The vertical distribution from the high to low intertidal zone was S. thunbergii and Gloiopeltis furcata; M. simplex and S. thunbergii; and S. fusiforme at Gwanmaedo. Seaweed zonation was distinct at Yeongsando, with S. thunbergii and Gelidiophycus freshwateri; M. simplex and S. thunbergii; and S. thunbergii and S. fusiforme. Seaweed biomass, evenness index (J``), and diversity index (H``) values were greater at Yeongsando (138.21 g/m2, 0.51, 2.18 respectively) than at Gwanmaedo (93.57 g/m2, 0.48, 2.04), indicating that the seaweed community at Yeongsando is more stable than that at Gwanmaedo.

지충이 용매 추출물의 항산화 활성

최선영(Sun-Young Choi),김순영(Soon-Young Kim),허종문(Jong-Moon Hur),최한길(Han-Gil Choi),성낙주(Nak-Ju Sung) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.2

지충이(Sargassum thunbergii)의 기능성을 밝히고 식품으로서 이용성을 증대시키기 위하여 전자공여 작용, 아질산염 소거작용, SOD 유사활성, 환원력 및 β-carotene-linoleate model system을 이용하여 항산화능을 측정하였다. 총 페놀함량은 chloroform 추출물이 22.5±0.8 ㎎/100 mL, methanol 추출물이 20.1±0.6 ㎎/100 mL였으며, 전자공여 작용은 hexane 추출물을 제외한 모든 시료에서 추출물의 농도가 높을수록 그 효과가 증가하였으며, 특히 추출물의 농도 1000 ㎍/mL일 때 methanol 추출물과 water 추출물에서 각각 70.4%와 63.2%로 radical 소거능이 강했다. 아질산염 소거작용은 pH 2.5 반응용액에서 추출물의 농도가 증가할수록 뛰어난 소거작용을 보였으며 1,000 ㎍/mL에서 methanol 추출물이 89.4±0.9%로 가장 높은 아질산염 소거작용을 보였고 반대로 water 추출물은 38.6±0.5%로 낮은 소거효과를 보였다. SOD 유사활성은 chloroform 추출물이 1,000 ㎍/mL 첨가 시 61.4%로 활성이 가장 높았다. β-carotene-linoleate model system에서 항산화 활성을 측정하였을 때 시료의 첨가 농도가 증가할수록 항산화 활성이 높아지는 경향을 보였으며 가장 활성이 높은 methanol 추출물의 경우 1,000 ㎍/mL 농도에서 78.4%로 대조구인 BHT(72.1%)보다 더 항산화 활성이 높았다. In this study, we investigated the antioxidant activity of solvent extracts from Sargassum thunbergii by measuring electron-donating ability (EDA), nitrite-scavenging ability, superoxide dismutase (SOD)-like activity, reducing power and antioxidant activity in β-carotene-linoleate model system. Total phenolic compound contents of chloroform and methanol extracts from Sargassum thunbergii were 22.5±0.8 ㎎/100 mL and 20.1±0.6 ㎎/100 mL, respectively. The EDA were proportionally increased with concentration of the extracts except hexane extract. The EDAs were 70.4% and 63.2% in methanol and water at concentration of 1000 ㎍/mL, respectively. The nitrite-scavenging ability of methanol extract (pH 2.5, 1000 ㎍/mL) was 89.4±0.9% that was higher than those of other extracts. SOD-like ability of chloroform extract was stronger than other extracts. Reducing power of chloroform extracts at 1000 ㎍/mL were 0.75 as O.D. value of 700 ㎚ and antioxidant activities measured with β-carotene-linoleate model system were in order of methanol (78.4%)>BHT (72.1%) >chloroform (62.2%)>water (51.4%)>hexane (43.2%). These results indicated that methanol extract from Sargassum thunbergii showed the highest activities on the EDA, nitrate-scavenging ability and antioxidant activities while the chloroform extract had the highest effect on the SOD-like activity and reducing power.

신고리원자력발전소 주변 해역 조간대의 해조상 및 군집구조

한수진 ( Su Jin Han ),장재길 ( Jae Gil Jang ),황용훈 ( Youg Hun Hwang ),손민호 ( Min Ho Son ),최한길 ( Han Gil Choi ) 한국수산과학회 2017 한국수산과학회지 Vol.50 No.3

Marine algal flora and community structures were examined seasonally at three sites around the Shingori Nuclear Power Plant, Korea from February to November 2016. A total of 76 species were identified, including 9 green, 14 brown and 53 red algae. The greatest number of species occurred at Daesongri (51 species) followed by Sinamri (43 species) and at the discharge area (38 species) during the study period. Of the 76 seaweeds, 59 annuals and 17 warm tolerant species were recorded. Annual average biomass in dry weight varied from 168.02 g/m² at the discharge area to 222.53 g/m² at Sinamri. The coarsely branched form was the dominant functional form of seaweeds at the three sites. Seaweed community structures at the discharge site were distinguishable by decreasing species richness, biomass, species diversity index, richness index, and evenness index. The ratio of warm tolerance species and the dominance index values were remarkably higher at the discharge than those at the other sites.