• ALGAE
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• 제34권2호
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• pp.99-109
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• 2019

Habitat-forming species increase spatial complexity and alter local environmental conditions, often facilitating the assembly of plants and animals. We conducted a trait-based approach to algal assemblages associated with the freshwater bryozoan, Pectinatella magnifica. Association with algae leads to the inner bodies of the bryozoans being colored green; this is frequently observed in the large rivers of South Korea. We collected the green-colored gelatinous matrices and phytoplankton from waterbodies of the two main rivers in South Korea. Algal assemblages within the colonies and in the waterbodies were compared using the three diversity indices (richness, diversity, and dominance), and the composition of functional groups (FGs) and morphologically based functional groups (MBFGs) between the colonies within and outside of P. magnifica colonies. The most dominant and common species within the colonies were Oscillatoria kawamurae and Pseudanabaena catenata, both of which were assigned to the same FG (codon S1). Of the algal assemblages within the colonies, the dominance was higher, while the richness and diversity were lower, than those in the waterbodies. There was variation in the compositions of FGs and MBFGs in the waterbodies outside the colonies. Total nitrogen and orthophosphate led to dominance, and were significant factors for the variation in FGs in the waterbodies, whereas there were no such significant factors within the colonies. This trait-based approach to the community structure of associated algae provides the status and habitat gradient of these communities, which are stable, isolated, and consistent with the overgrowth of shade-adapted tychoplanktonic cyanobacteria.

• 한국해양학회지
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• 제13권2호
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• pp.31-41
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• 1978

일부 선정된 조류의 생리와 많은 종의 출현에 대한 연구문헌은 상당히 많음에도 불구하고 환경의 요구조건이나 생명활동의 필수조건이라는 점에서는 대부분의 조류에 대한 이해가 아직은 부족한 상태에 있다. 이는 첫째 일반으로 실험실에서의 배양연구가 종간의 상호작용과 천이등 복잡한 자연현상이 결여된 단순하고 안정된 환경에서 이루어지고 있어서 이 경우 생물의 상호작용, 천이 및 기타 복잡한 자연현상이 결핍되고 둘째로 대부분의 현지관측이 macro-environment에 한정되고 생태형(ecophen)을 무시한채 종을 기록하기 때문이다. 일부 종에 대한 생리적 생태에 대한 한정된 지식으로는 미소생물군집의 성인과 기능적 성질에 대한 복잡한 상호작용을 분석하는데 적절치 못하다. 그러므로 생태계에 중요한 모든 종에 대한 하천환경을 이해하기 위해서 오염 같은 환경 stress가 자연군집에 미치는 영향을 규명해 보는 것은 합리적인 방법이다.(Patrick, 1968)

• 한국물환경학회지
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• 제30권5호
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• pp.539-548
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• 2014

This study was carried out to investigate algal community structures and their correlations with environmental factors on five weir areas in the Nakdong River, South Korea. Water qualities, hydrodynamics, meteorological conditions and algal species compositions were observed in studied sites from May 2010 to Dec. 2013. Results showed that average total phosphorus concentration of 2013 was decreased by 52.4% in comparing with that from 2010 to 2011. Chlorophyll.a concentrations were positive significant with water temperature, pH, total phosphorus and total nitrogen, but is not significant with turbidity and suspended solids. Seasonal successions of algae were observed that Stephanodiscus sp. was dominant species with 65.3% of dominant frequency in studied site. Large algal biomass of the low temperature-adapted diatoms were observed during temperature range of $4{\sim}9^{\circ}C$, but large cyanobacterial biomass mainly during high temperature period ranged from $22^{\circ}C$ to $32^{\circ}C$. Microcystis sp. dominated during high water temperature in summer. The yearly correlations of algal biomass with accumulated solar radiations were not significant but seasonal correlations of summer from June to August were significant with correlation coefficient 0.33 (p<0.05). There were not significant correlations between turbidities and algal biomass. Turbidity and suspended solids concentrations were not significant correlation with algal biomass. According to the results, algal communities had strong correlation with water temperature and had partially correlation with solar radiation. For an effective management of algal blooms, water managers should survey with more long-term monitoring of various environmental factors and algal communities.

• Journal of Plant Biology
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• 제19권4호
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• pp.111-118
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• 1976

The marine algal vegetation of spring season in the intertidal belt of Jeju Island, Korea, was carried out by the quadrat method at 4 transects; Moseulpo, Kangjeong, Whabug, and Hado in 1976. The transects were divided into 5 stations by exposed frequencies of the substratum from water, such as more than 50%, 46-49%, 28-45%, 7-27%, and less than 6%. As a result, the algal vegetations were separated into three groups, high, middle and low algal communities. The representative dominant species of each group are aas follows. High algal community: Porphyra suborbiculata, Bangia fusco-purpurea, Gloiopeltis furcata. Middle algal community: Ishige okamurai, Hizikia fusiforme, Corallina pilulifera, Sargassum thunbergii. Low algal community: Sargassum ringgoldianum, Sarg. confusum. The coverage of these groups is 43.5, 57.6%, and 77.3%, respectively.

• Journal of Plant Biology
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• 제33권4호
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• pp.225-236
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• 1990

Intertidal algal communities of Muchangpo and Maryangri in western coast of Korea were investigated qualitatively and quantitatively. Seasonal assessments of species composition, biomass, dominant species in biomass and vertical distributional pattern were conducted from July 1986 to April 1988. Ninety-nine species of marine algae (13 Cyanophyta, 12 Chlorophyta, 24 Phaeophyta and 50 Rhodophyta) were observed, of which 90 (13 Cyanophyta, 11 Chlorophyta, 23 Phaeophyta and 43 Rhodophyta) were from Muchangpo and 83 (10 Cyanophyta, 11 Chlorophyta, 21 Phaeophyta and 41 Rhodophyta) were from Maryangri, respectively. Ordination by detrended correspondence analysis based on the floristic data from nine localities indicated that, on the whole, marine algal distribution in western coast of Korea might be divided into two regions, i.e. the north and the south, being separated at the Taean Peninsula, the mid-western coast. Seasonal fluctuations of mean biomass were 44.55-201.19g-dry wt/$m^2$ at Muchangpo and 19.59-134.76g-dry wt/$m^2$ at Maryangri. Important species determined by the specific proportion of biomass were Sargassum thunbergii, Pelvetia siliquosa and Corallina pilulifera at Muchangpo, and Sargassum thunbergii and Corallina pilulifera at Maryangri.

• 한국수산과학회지
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• 제16권4호
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• pp.379-388
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• 1983

본 조사는 전남 여천군 돌산읍 죽포리 두문포의 조하대 해조군락의 특성을 밝히기 위하여 1982년 6월 부터 1983년 5월 까지 연간 계절별로 SCUBA 잠수에 의해 채집된 자료를 분석하므로 수행되었다. 조하대의 수직분포는 sheltered 지역의 특성을 나타내고 있고, 상부, 중부, 하부의 3개 구역으로 나누어지며, 상부는 Ulva pertusa, Codium fragile, Chondria crassicaulis, Gigartina tenera의 녹조, 홍조류, 중부는 Myagropsis myagroides와 Sargassum tortile의 대형갈조류, 하부는 Plocamium telfairiae, Callophyllis japonica, Symphyocladia linearis의 홍조류가 우점종으로 나타났다. Normal association analysis를 통한 군락분석결과 이 지역 해조군락은 9개의 group으로 나누어지고, 각 group의 우점종은 각각 Sargassum tortile, Myagropsis myagroides, Chondrin crassicaulis, Codium fragile, Pterocladia tenuis, Gigartina tenera, Gracilaria textorii등이었고 이 지역의 해중림을 조성하는 대표적 종은 Myagropsis myagroides와 Sargassum tortile 이었다. 한편, Myagropsis myagroides의 현존량은 $50{\times}50cm$당 봄철에 5,248g, 여름에는 650.4g, 가을에는747.6g이었고, 평균체장은 봄부터 가을까지 계절별로 각각 169.9cm, 48,4cm, 149.9cm여서 생식이 끝난 직후인 봄철에 최고치를 나타내고 소멸기인 여름에 최소치를 나타냈다.

• 한국수산과학회지
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• 제54권6호
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• pp.1007-1016
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• 2021

This study examined the characteristics and seasonal distribution patterns of subtidal marine algal communities along the east coast of Korea, from 2016 to 2017, and recorded the coverage ratio (%) by the algal type. During the study period, 134 marine algae species (16 green, 29 brown, and 89 red) were identified at the survey sites. The maximum number of species was observed at the Nagok site (70 species), and the minimum at the Gisamoon site (50 species). The total average biomass (dry weight) during the survey period was 66.22 g/m², including green algae (2.19 g/m²), brown algae (38.10 g/m²), and red algae (25.94 g/m²). The dominant seaweeds in the vertical distribution based on coverage rates (%) were Sargassum yezoense and Dictyopteris divaricata at the upper, Symphyocladia latiuscula and Undaria pinnatifida at the middle, and Agarum clathratum subsp. yakishiriense and Plocamium telfairiae at the lower sections of the distribution. Richness, evenness, and diversity index, calculated based on the biomass of the abundant species, were estimated to be 6.36, 0.55, and 1.98, respectively, over the entire sea area. Based on the evaluation of the environmental states using community indices, the ecological evaluation index (EEI-c) of subtidal marine algal communities along the east coast of Korea was marked as 'good-moderate'.

• ALGAE
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• 제19권2호
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• pp.115-122
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• 2004

The epilithic algal communities on the artificial substrata (unglazed ceramic tiles) were investigated from 5th July to 24th July 1999 with two or three days intervals for elucidating the effects of the experimental acidification. They were harvested inside the mesocosm with and without the acid treatment on Togyo reservoir within the Civilian Passage Restriction Line near Demilitarized Zone (DMZ) in Korea. After the colonization of epilithic algal community, their standing crops revealed different patterns outside and inside the mesocosm. However the time lapse of 5 days was observed on the inside with acid treatment. The dominant species were different: Achnanthes minutissima was outside but Coenochloris polycocca was inside and inside with acid treatment. The differences in floral composition were also found. Achnanthes minutissima which has been the most important species in the colonization by the epilithic algal community of the mesocosm was less important at the lower pH. Coenochloris polycocca is a species well adapted to low pH.

• 대한환경공학회지
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• 제33권11호
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• pp.847-854
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• 2011

주요 신재생에너지인 바이오에너지의 일환으로 조류를 이용한 바이오에너지 및 자원화 기술에 대한 관심이 높아지고 있다. 조류는 영양염류 제거 능력을 활용해서 하수와 같은 오폐수 내 난분해성오염물질과 영양염류 제거의 고도처리도 가능하다. 조류와 박테리아 간의 생태적인 상호작용이 조류를 활용한 하수처리 및 하수자원화에 중요한 역할을 함에도 불구하고, 실지 하수 조건에서 조류와 박테리아간의 생태학적인 상호작용에 관한 과학적인 정보가 부족하다. 본 연구에서는 하수에서 배양이 잘 되고, 지질함량이 높다고 알려진 국내 조류 종인 Ankistrodesmus gracilis SAG 278-2의 하수오염물질 제거 특성과 조류 주입에 따른 하수 박테리아 군집의 반응을 실지 하수 조건에서 연구하였다. 하수 박테리아의 수가 증가는 조류의 성장 속도를 감소시켰으나, 반면 조류의 성장은 박테리아의 생존 및 내성호흡 생분해 속도에는 영향을 주지 않았다. 조류가 주입된 하수에서 난분해성 유기물질 및 총질소의 제거 향상이 관찰되었다. 박테리아 16S rRNA 유전자 T-RFLP 분석에 따르면 조류의 주입은 시간에 따라 박테리아 군집에 영향을 주었다. 박테리아 16S rRNA 유전자 PCR 증폭, clone 및 염기서열 분석 결과, 하수 내 조류의 성장은 박테리아 군집 구성을 변화시키며, 조류와 함께 공동 성장 가능한 박테리아는 Sediminibacterium, Sphingobacterium, Mucilaginibacter 속에 속하는 개체로 판명되었다.

• 한국수산과학회지
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• 제48권1호
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• pp.82-87
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• 2015

For the ecological evaluation of marine algal vegetation, flora and their communities were surveyed seasonally at Goseong, on the southern coast of Korea. A total of 102 algal species, comprising 17 green, 18 brown and 67 red algae, was identified. Representative dominant species were assessed as Ulva australis, Sargassum thunbergii, and Gelidium amansii. Of these, Ulva australis was remarkably dominant in all seasons. High biomass of the dominant species were recorded. The total seasonal biomass was highest in winter and lowest in summer. The mean biomass value was $1315.6g/m^2$ across the four seasons. Each species was classified into six functional groups, and two ecological state groups (ESG) were evaluated based on these groups. While ESG I, the late successional species group, formed only 18.6% of the algal community; ESG II, composed of opportunistic species, comprised 81.4%. This suggests that environmental stress has been continuously imposed on the marine algal vegetation of the present study area.