• 환경생물
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• 제38권2호
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• pp.254-270
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• 2020

금강 하구해역 식물플랑크톤 군집의 시·공간적 변동 및 생물해양학적 환경특성을 파악하기 위해 2018년 2월, 5월, 8월 및 11월, 4계절에 거쳐 15개 정점을 대상으로 현장조사를 실시하였다. 조사기간 동안 출현한 식물플랑크톤 종은 58속 116종으로 겨울과 봄에 단순하였고, 여름과 가을에 상대적으로 다양하게 출현하였다. 현존량은 가을에 10 cells mL^-1에서 겨울에 2,904.0 cells mL^-1까지 큰 변동 폭으로 평균 577.2 cells mL^-1의 높은 현존량을 보였으며, 출현 종과는 달리 봄과 가을에 낮고, 여름과 겨울에 높은 현존량을 나타내었다. 우점종은 연중 규조류 점유율이 높았으며, 겨울은 Thalassiosira nordenskioeldii, Cerataulina bergonii, Skeletonema costatum-ls 및 Coscinodiscus angustelineata, 봄은 S. costatum-ls 및 C. bergonii, 여름은 Eucampia zodiacus 및 Th. nordenskioeldii, 그리고 가을 하구역은 Aulacoseira cf. granulata, 혼합해역은 S. costatum-ls 및 외해역은 Lingulodinium polyedra가 우점하였다. 그리고 주성분 분석에 의하면 금강 하구해역의 식물플랑크톤 군집은 연간 금강하굿둑을 통해 유입되는 높은 영양염을 포함하는 담수의 유입량과 확장 정도에 크게 영향을 받고 있었다. 그러나 하굿둑을 통한 직접적인 담수 영향은 금란도 주변까지의 영역에 한정되었고, 그 외 해역은 해수와 담수가 강하게 혼합되었다.

• 한국환경과학회지
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• 제19권11호
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• pp.1323-1336
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• 2010

This study was carried out to determine marine environments and phytoplankton community around Mokpo harbour on March to November during the period of 2004-2009. The remarkable fluctuations of marine environments were shown around Mokpo harbour depending on monthly and yearly. Among seasons, summer was a great that was associated with extremely releasing the freshwater from Youngsan River Weir, contributing to effect the fluctuations of water quality. Nevertheless of monthly and yearly, the molecular ratio of N:P was always shown in above 16 that was mainly attributed to freshwater discharge on March to November. This indicates that phosphorus playes an important role in limiting factor as growth in phytoplankton. During this study, Skeletonema costatum was found to be richer than the other groups of diatoms in terms of abundance and species number. Mokpo harbour, with the presence of a narrow avenue for exchange with offshore waters, has limited growth in phytoplankton, but this species is able to well adapt and fast grow under even high level of suspended solid and low intensity of light compared with other species. The discharge of freshwater is associated with significantly fluctuation of marine environments in this region, but it does not affect the quantitative and qualitative distribution of phytoplankton. It is necessary to persistently monitor based on water quality and phytoplankton community.

• 한국수산과학회지
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• 제33권1호
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• pp.43-50
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• 2000

남해 중앙부에 위치하는 해창만의 식물플랑크톤 군집은 비교적 다양한 생물종에 의해 군집을 이루고 있으나, 출현 세포 밀도는 매우 낮은 특징을 보였다. 특히, 계절적으로는 여름과 가을에 높은 세포 밀도를 나타내고 있는 반면, 봄에 낮은 세포 밀도를 나타내나, 식물플랑크톤 군집은 연중 중심목 규조류에 의해 지배되고 있었다. 그러나, Chl-a량의 분포와 관련하여, 식물플랑크톤에 의한 해창만의 기초생물 잠재생산력은 연중 매우 높은 것으로 판단되며, 미소 또는 극미소 플랑크톤에 대한 점유율이 높을 것으로 추정되었다.

• 환경생물
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• 제40권1호
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• pp.70-86
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• 2022

서해 남부 안마군도 주변 해역 식물플랑크톤 군집의 계절 동태를 파악하기 위하여 2020년 봄부터 2021년 겨울까지 소형 해양조사선 에드오션호를 이용하여 21개 정점의 표층과 저층 해수를 대상으로 현장조사를 하였다. 결과, 출현한 식물플랑크톤 종은 52속 87종으로, 규조류가 67.8%, 와편모조류가 26.5%, 규질편모조류가 3.5%, 그리고 은편모조류 및 유글레나조류가 각 1.1%를 차지하였다. 계절별로 출현 종은 봄에 단순하였고, 겨울에 상대적으로 다양하였다. 표층 현존량은 여름 28.8±30.1 cells mL^-1로 낮았고, 봄 87.0±65.1 cells mL^-1로 높았다. 식물플랑크톤 군집은 연중 규조류가 80% 이상 높은 점유율을 나타내었고, 우점종은 Skeletonema costatum-ls가 봄과 겨울에 60% 이상 극우점을 보였고, 여름과 가을 각 34.6%와 24.2%로 최우점하였다. 군집구조 특성을 나타내는 다양도 지수는 현존량과 다르게 가을에 2.79±0.45로 높았고, 봄에 1.82±0.18로 낮았다. 그러나 우점도 지수는 봄에 0.86±0.08로 높았고, 가을에 0.44±0.13로 낮았다. 환경인자 및 식물플랑크톤 군집 관련 인자를 이용한 주성분 분석 결과, 식물플랑크톤 군집을 통해 본 안마군도 주변 해역의 생물해양학적 환경 특성은 상대적 개방해역 및 조석 혼합 등 해수 혼합에 의한 해저 퇴적층에서 공급되는 영양염 등에 의해 지배되는 것으로 추정되었다.

• ALGAE
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• 제23권4호
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• pp.277-288
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• 2008

The relationship between nutrients and phytoplankton dynamics was investigated daily from 12 April to 22 July 2003 in Sagami Bay, Japan. According to multidimensional scaling (MDS) and cluster analysis, phytoplankton community was divided into four distinct groups. The first group was consisted of centric diatom species, such as Guinardia spp., Detonula spp., Letocylindrus danicus, Skeletonema costatum, Eucampia zodiacus and Chaetoceros spp.. The second and third clusters comprised mainly diatoms and dinoflagellates, respectively. The other cluster was restricted to the samples collected during the last sampling period when the rainfall and river discharge was frequently recorded. Canonical correspondence analysis (CCA) was applied to analyze four groups respectively, which focused on the effects of nutrients concentration and ratio on phytoplankton variations. Based on CCA analysis, most species of centric diatom were negatively correlated with DSi concentrations and Si/N ratio. Nutrients were strongly limited phytoplankton growth during the summer when the rainfall was not observed, whereas river discharge by rainfall and counterclockwise coastal currents (although the surface circulation pattern is often altered by Kuroshio Current, the counterclockwise coastal currents are generally dominant) has brought phytoplankton population accumulation and triggered the micoalgae growth in western part of the bay. Phosphorous (P) was strongly limited after significantly increases in the phytoplankton abundances. However, silicate (Si) was not a major limiting factor for phytoplankton production, since Si/DIN and Si/P ratio did not create any potential stoichiometric limitation. This indicates that high Si availability contributes favorably to the maintenance of diatom ecosystems in Sagami Bay.

• 한국환경과학회지
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• 제10권4호
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• pp.259-267
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• 2001

Investigations were carried out to observe the seasonal succession of phytoplankton, and viable counts of bacteria from the mid to lower reaches of Nakdong Fiver. An intensive monitoring was conducted from May to December 1999 biweekly at 6 sites in a main channel and 3 tributaries. Although there are several sites with high nutrient loading from the basin, all of study sites showed mesotrophic states owing to high discharge(June~September). Relatively low algal biomass and CFUs(mean of chi. a, $12.3{\pm}$11.5 $\mu\textrm{g}${\el}l$, CFUs : 1.8${\times}10^7$) were observed during the rainy season. The diatom population was dominant(over 85% of total community) year-long with peaks(Stephanodiscus hantzchii) in the fall and winter. Dominance of blue-green algal groups during the summer was not observed in the summer. Microorganisms peaked in the summer and fall(June~September), affected mainly by the inputs of phytoplankton and nutrients. Biomass of phytoplankton and CFU counts were higher in the Kumho River than other tributaries and main channel.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제2권1호
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• pp.21-28
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• 1998

A total of 94 taxa were identified from the Southern Ocean, 140-148 $^{\circ}E$ and 40-53 $^{\circ}S$, as an early austral summer phytoplankton. They were 53 diatoms, 37 dinoflagellates, 2 silicoflagellates, 1 prymnesiophyte, and 1 coccolithophorid. Integrated cell numbers of nanoplankton dominated microphytoplankton from 8 stations, especially from Subantarctic zone, but integrated biomass was lower than microphytoplankton. Integrated cell numbers of diatoms dominated dinoflagellates, coccolithophorids, and prymnesiophyte, but integrated biomass of microphytoplankton were dependent to the biomass of dinoflagellates except north of the Subtropical convergence zone and south of the Antractic convergence zone. Phytoplankton community changed across the fronts and 3 different communities were observed. Fronts seem to influence on the phytoplankton community from the west Pacific Sector of the Southern Ocean.

• 한국환경과학회지
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• 제2권1호
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• pp.21-28
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• 1993

A total of 94 taxa were identified from the Southern Ocean, 140-148 。E and 40-53。S, as an early austral summer phytoplankton. They were 53 diatoms, 37 dinoflagellates, 2 silicoflagellates, 1 prymnesiophyte, and 1 coccolithophorid. Integrated cell numbers of nanoplankton dominated microphytoplankton from 8 stations, especially from Subantarctic zone, but integrated biomass was lower than microphytoplankton. Integrated cell numbers of diatoms dominated dinoflagellates, coccolithophorids, and pnrnnesiophyte, but integrated biomass of microphytoplankton were dependent to the biomass of dinoflagellates except north of the Subtropical convergence zone and south of the Antractic convergence sone. Phytoplankton community changed across the fronts and 3 different communities were observed. Fronts seem to influence on the phytoplankton community from the west Pacific Sector of the Southern Ocean.

• 한국환경과학회지
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• 제10권1호
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• pp.41-45
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• 2001

This study was carried out to investigate phytoplankton community structure in the Naktong river from January to December in 1999. In water quality, average value of pH were 8.1, BOD 2.5mg/$\ell$, COD 5.0mg/$\ell$, Chl-a 41$\mu\textrm{g}$/$\ell$, and $NH_4^+-N$ 0.08mg/$\ell$, respectively. Phytoplankton were identified 42 genera 76 species. Among these, diatoms were 39 species(51.3%), green algae 25 species(32.9%), cyanobacteria 4 species(5.3%), dinoflagellates 4 repectively. The highest standing crops were 33,023 cells/$m\ell$ in February at the Mulgum and the lowest 79 cells/$m\ell$ in March at the Goryung. Also, Standing crops were increased with proceeding from middle part to lower part. Seasonal succession of phytoplankton represented that Stephanodiscus hantzschii was dominant species in winter, Cyclotella menaghiniana and Synedra acus in spring, C. meneghiniana, S. acus, Aulacoseira granulata var. angustissima in summer, and A. granulata var. angustissima and C. meneghiniana in autumn. Ecological important species were 4 species, that are Stephanodiscus hantzschii, Cyclotella meneghiniana, Synedra acus, and Aulacoseira granulata var. angustissima. In the community analysis, dominance indices ranged from 0.434(August, Namji) to 0.999(January, February, Mulgum) and diversity indices from 0.026(February, Mulgum) to 3.073(September, Namji). According to the similarity index among the stations, it was generally defind as two areas such as middle(Goryung, Namji and Samryangjin) and lower part(Mulgum).

• ALGAE
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• 제19권3호
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• pp.227-234
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• 2004

A study on the dynamics of phytoplankton community and the physico-chemical environmental factors was performed biweekly from April 1998 to March 1999 in Youngchun Dam. A total 72 phytoplankton taxa was identified and dominant taxa were blue-green algae and diatoms. The highest value of phytoplankton standing crop (24,826cells·ml$^{-1}$) was observed in September 7, 1998, the blooming period of blue-green algae Phormidium sp., while the lowest (318cells·ml$^{-1}$) was measured in June 18, 1999. The phytoplankton communities were dominated by blue-green algae of Anabaena planktonica, Microcystis aeruginosa and Phormidium sp. during the summer and autumn periods and were dominated by diatoms of Synedra acus and Aulacoseira spp. during the spring and winter periods. Secchi disc transparency, chlorophyll-a, total nitrogen, total phosphorus and silicate concentration were varied in the ranges of 0.4-2.5 m, 2.4-32.2mg·m$^{-1}$, 0.845-2.352mg·l$^{-1}$, 0.005-0.093mg·l$^{-1}$, 0.2-15.7mg·l$^{-1}$, respectively. The trophic status of Youngchun Dam were estimated eutrophic according to Lake Trophic States Index (LTSI).