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.

해조류 군집지수에 기초한 해양국립공원의 생태학적 평가

오지철 ( Ji Chul Oh ),최한길 ( Han Gil Choi ),김철도 ( Cheol Do Kim ),안중관 ( Jung Kwan Ahn ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.3

Seasonal variability in the algal community structure of intertidal zones was examined at six study sites in Marine National Parks, on the western and southern coasts of Korea from March to November 2015. A total of 193 species of algae, comprising 27 green, 40 brown and 126 red algae, were identified. Algal biomass averaged 101.50 g dry wt./㎡ with a maximal at Tonggae (168.12 g dry wt./㎡) and minimum at Haseom (54.49 g dry wt./㎡). The dominant seaweeds by biomass were Sargassum thunbergii at five sites (Tonggae, Haseom, Namdongri, Ando amd Sinjeonri), and S. fusiforme at Soando. Community indices measured as follows: dominance index (DI), 0.31-0.69; richness index (R), 7.30-11.43; evenness index (J`), 0.33-0.49; and diversity index (H`), 1.15-1.86. As evaluated using community indices and environmental states, the EEI (Ecological Evaluation Index) of the Marine National Park was "normal". The present results indicate that seaweed community structures and indices could be used to evaluate the environmental status of coastal ecosystems.

한국 남서해안 흑산도와 홍도의 조간대 해조류 생물량과 군집구조의 계절적 변동

오지철 ( Ji Chul Oh ),박서경 ( Seo Kyoung Park ),최한길 ( Han Gil Choi ),남기완 ( Ki Wan Nam ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6

Seasonal variation in marine macroalgal community structure was examined at the intertidal zones of Heuksando and Hongdo,Shinan, Korea, from July 2008 to May 2009. In total, 86 macroalgal species were identified, including 12 green, 19 brown, and 55 red algae; 67 species at Heuksando and 70 species at Hongdo, were observed. Annual seaweed biomass was 252.44 g dry wt /m2 at Heuksando and 217.67 g dry wt/m2 at Hongdo. The dominant seaweed in importance value (IV > 15) differed between the sites: Sargassum thunbergii at Heuksando and Corallina pilulifera at Hongdo. The vertical distribution pattern of seaweeds from the upper to lower intertidal zones at Heuksando was Gloiopeltis spp., Ulva spp. ? S. thunbergii, S. fusiforme, Hildenbrandia rubra ? S. thunbergii, C. pilulifera. On the rocky shore of Hongdo, seaweed zonation was distinct: Porphyra yezoensis, Gloiopeltis spp.,Ulva spp. ? C. pilulifera, S. fusiforme, Myelophycus simplex ? Chondrus ocellatus, C. pilulifera, and Carpopeltis affinis. Annual seaweed coverage, richness index (R), evenness index (J``), and diversity index (H``) values were greater at Hongdo (41.35%, 12.82,0.59, and 2.50 respectively) than at Heuksando (31.54%, 11.93, 0.44, and 1.87 respectively), which may indicate that the seaweed community at Hongdo is more stable relative to the one at Heuksando.

한국 남해안 다도해·한려해상국립공원 도서의 해조상 및 군집구조 변화

오지철(Ji Chul Oh),김호연(Ho Yeon Kim),조현근(Hyun-Geun Cho),김철도(Cheol Do Kim),안중관(Jung Kwan Ahn) 국립공원연구원 2015 국립공원연구지 Vol.6 No.3

We investigated species composition and variation of benthic marine algae between 2014 at southern coast island, Korea. Coarsely branched form seaweeds were dominant functional group comprising 47.73% in species number, whereas filamentous form (18.64%), sheet form (11.82%), thick leathery form (9.55%), crustose form (6.82%), jointed calcareous form comprised 5.45%. C/P, R/P and (C+R)/P values were 0.33, 0.96 and 2.57, respectively. Such fast growing ESG II (ecological state group) was 22.65% and slow growing perennial algae, ESG I was only 77.35%. 본 연구는 14년 남해 연안 도서에서 조하대 해조류 종구성과 변화를 파악하기 위해 수행하였다. 연구기간 출현한 해조류는 총 220종(녹조 20종, 갈조 60종, 홍조 140종)이 출현하였다. 해조류의 기능형은 성긴분기형(47.73%), 사상형(18.64%), 엽상형(11.82%), 다육질형(9.55%), 각상형(6.82%), 유절산호말형(5.45%)으로 구분되었다. 해조상의 지역적 특성을 나타내는 C/P값은 0.33을 보였고, R/P값은 0.96, (R+C)/P값은 2.57로서 혼합형 해조상을 보였다. 또한, 환경상태와 밀접한 관련을 보이는 ESG II의 비율은 약 22.65%를 보여 해조상을 통해 파악된 국립공원 내 도서지역 환경상태는 양호한 편이다.

실내배양에서 납작돌잎(Lithopyllum yessoense)과 진분홍딱지(Hildenbrandia rubra)의 배아 생장에 미치는 환경요인의 영향

송지나 ( Ji Na Song ),박서경 ( Seo Kyoung Park ),오지철 ( Ji Chul Oh ),유현일 ( Hyun Ill Yoo ),최한길 ( Han Gil Choi ),김영식 ( Young Sik Kim ),남기완 ( Ki Wan Nam ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6

The effects of environmental factors, such as irradiance, daylength, salinity, and desiccation, on the growth of Lithophyllum yessoense and Hildenbrandia rubra sporelings were examined. Sporelings of each species were cultured with 10, 50, 80, 120, 150μmol photon m-2 s-1 for 14 days and their maximum growth occurred under 80 μmol photon m-2 s-1. Germlings of both species survived for 21 days in darkness, and even the L.yessoense germlings grew. In the salinity experiment, sporelings of each species survived for 7 days and died after 14 days under 20 and 25 psu, but the sporelings grew well under 34 psu. Physiological features of each species with respect to the evaluated daylengths (8, 12, 14 and 16 h) were slightly different, and maximal growth occurred at 16 h for L. yessoense and at 14 h for H. rubra sporelings. Mortality of the sporelings increased with the exposure period, but H. rubra was less tolerant to desiccation than L. yessoense. In conclusion, sporelings of the two species showed similar growth responses to various environmental factors with slightly different physiological features with respect to salinity, daylength, and desiccation. However, more ecological and physiological studies on slow-growing crustose algae are required to elucidate the expansion of barren ground around the coastal areas of Korea.

변산반도 해조류 군집구조의 계절적 변동

한수진 ( Su Jin Han ),이지희 ( Ji Hee Lee ),전다빈 ( Da Vine Jeon ),오지철 ( Ji Chul Oh ),김보연 ( Bo Yeon Kim ),박서경 ( Seo Kyoung Park ),최한길 ( Han Gil Choi ),남기완 ( Ki Wan Nam ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.3

We examined seasonal variation in the structure of marine macroalgal communities at five sites around the Byeonsan Peninsula, Korea, from January to October 2011. Sixty eight species were identified, including 11 green, 17 brown and 40 red algae. Species richness was highest at Gyeokpo (51 species) followed by Sambal (47), Gosapo (34), Byeonsan (33), and Habgoo (18). Seaweed biomass ranged from 12.98 to 145.33 g dry wt/m2, with maximum and minimum biomasses at Gyeokpo and Habgoo, respectively. Sargassum thunbergii was the representative alga spe-cies occupying 47.89% of the total biomass. The dominant seaweeds were S. thunbergii, Corallina pilulifera Ulva spp, Gracilaria vermiculophylla, and Carpopeltis affinis. No distinctive vertical distribution of seaweeds was found because S. thunbergii, Ulva spp, and G. vermiculophylla were all distributed from high to low shore. Community indices were as follows; dominance index (D1), 0.44-0.61; richness index (R), 6.27-10.35; evenness index (J`), 0.38-0.59; and diversity index (H`), 1.48-1.71. Gyeokpo had the most biomass and highest species richness, and the lowest percentage of Ulva species. However, species richness declined at Gyeokpo, from 78 to 51 species within 10 years, implying that eutrophication and sedimentation from Mankyeong and Dongjin rivers have reduced the stability of seaweed communities.

서해안 태안반도 해조군집의 종조성과 수직분포

안중관 ( Jung Kwan Ahn ),유경동 ( Kyong Dong Yoo ),오지철 ( Ji Chul Oh ),이재일 ( Jae Il Lee ),윤희동 ( Hee Dong Yoon ),김영환 ( Young Hwan Kim ) 한국수산과학회(구 한국수산학회) 2017 한국수산과학회지 Vol.50 No.1

Seasonal variability in algal community structure was examined at the intertidal zones of five study sites on the Taean Peninsula, on the western coast of Korea, from February 2014 to November 2015. A total of 118 species of marine algae, comprising 17 green, 24 brown and 77 red algae, were identified. The maximum number of species was observed at the Mohang site (75 species), and the minimum at the Yeonpo site (46 species). The seaweed biomass was 160.24 g dry wt./m² on average, and was maximal at Uihang (519.04 g dry wt./m²) and minimal at Yeonpo (19.03 g dry wt./m²). Based on biomass, the dominant seaweeds at Taean peninsula were Sargassum thunbergii and Corallina pilulifera. Community indices were as follows: richness index (R), 3.21-5.01; evenness index (J`), 0.33-0.38; and diversity index (H`), 0.90-1.12. Based on evaluation of the environmental states by the community indices, the ecological evaluation index (EEI) of Taean peninsula was “moderate”. The overall species and biomass of seaweeds decreased after the oil spill. However, Hakampo previously showed a similar algal community structure. In conclu-sion, the algal community was temporarily affected by the oil spill, but rapidly recovered.

납작돌잎(Lithophyllum yessoense)과 진분홍딱지(Hidenbrandia rubra)의 포자방출 및 생장에 미치는 수온의 영향

김영식 ( Young Sik Kim ),남기완 ( Ki Wan Nam ),최한길 ( Han Gil Choi ),송지나 ( Ji Na Song ),박서경 ( Seo Kyoung Park ),허진석 ( Jin Suk Heo ),오지철 ( Ji Chul Oh ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.3

The effects of temperature on spore release, growth and photosynthetic efficiency of Lithophyllum yessoense and Hildenbrandia rubra were examined. L. yessoense was collected at Galnam and H. rubra was collected at Gyeokpo, Korea. The experimental temperatures were different for spore release (10, 15, 20°C), sporeling growth (10, 15, 20, 25, 30°C) and photosynthetic efficiency (10, 15, 20, 25°C). All other culture conditions were the same: 34psu, 12:12 LD and 50 μmol photon m-2s-1. Spore liberation was maximal at 10°C for L. yessoense and at 20°C for H. rubra. After 14 days, the surface area of L. yessoense was 0.031 mm2 at 25°C and for H. rubra was 0.032 mm2 at 20°C. Sporelings of L. yessoense were a dark-red color and grew in a round shape. In contrast, H. rubra was bright pink and changed from a round shape in the early growth stage to later become flabelliform. Photosynthetic efficiency was highest between 20-25°C in both species. In conclusion, L. yessoense and H. rubra display different physiological features based on the optimal temperatures for spore release and sporling growth.