• Title/Summary/Keyword: 식물 플랑크톤 생체량

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Phytoplankton Variability in Response to Glacier Retreat in Marian Cove, King George Island, Antarctica in 2021-2022 Summer (하계 마리안 소만 빙하후퇴에 따른 식물플랑크톤 변동성 분석)

  • Chorom Shim;Jun-Oh Min;Boyeon Lee;Seo-Yeon Hong;Sun-Yong Ha
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.29 no.5
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    • pp.417-426
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    • 2023
  • Rapid climate change has resulted in glacial retreat and increased meltwater inputs in the Antarctic Peninsula, including King George Island where Marian Cove is located. Consequently, these phenomena are expected to induce changes in the water column light properties, which in turn will affect phytoplankton communities. To comprehend the effects of glacial retreat on the marine ecosystem in Marian Cove, we investigated on phytoplankton biomass (chlorophyll-a, chl-a) and various environment parameters in this area in December 2021 and January 2022. The average temperature at the euphotic depth in January 2022 (1.41 ± 0.13 ℃) was higher than that in December 2021 (0.87 ± 0.17 ℃). Contrastingly, the average salinity was lower in January 2022 (33.9 ± 0.10 psu) than in December 2021 (34.1 ± 0.12 psu). Major nutrients, including dissolved inorganic nitrogen, phosphate, and silicate, were sufficiently high, and thus, did not act as limiting factors for phytoplankton biomass. In December 2021 and January 2022, the mean chl-a concentrations were 1.03 ± 0.64 and 0.66 ± 0.15㎍ L-1, respectively. The mean concentration of suspended particulate matter (SPM) was 24.9 ± 3.54 mgL-1 during the study period, with elevated values observed in the vicinity of the inner glacier. However, relative lower chl-a concentrations were observed near the inner glacier, possibly due to high SPM load from the glacier, resulting in reduced light attenuation by SPM shading. Furthermore, the proportion of nanophytoplankton exceeded 70% in the inner cove, contributing to elevated mean fractions of nanophytoplankton in the glacier retreat marine ecosystem. Overall, our study indicated that freshwater and SPM inputs from glacial meltwater may possibly act as main factors controlling the dynamics of phytoplankton communities in glacier retreat areas. The findings may also serve as fundamental data for better understanding the carbon cycle in Marian Cove.

Role of Aquatic Macrophytes as Refuge of Zooplankton on Physical Distribution (Summer Rainfall) in Shallow Wetlands (물리적인 교란 (여름 강우)에 대한 동물플랑크톤 서식처로서 수생식물의 중요성)

  • Choi, Jong-Yun;Kim, Seong-Ki;Kim, Dong-Hwan;Joo, Gea-Jae
    • Korean Journal of Ecology and Environment
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    • v.49 no.4
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    • pp.308-319
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    • 2016
  • In order to evaluate the role of macrophytes as refuge of zooplankton on physical distribution (i.e. summer rainfall), we investigated the environmental factors, macrophytes, and zooplankton in waterside zones (macrophytes zones) and open water zones of 17 wetlands from May and August, 2011. In this study, a total of 51 zooplankton species were identified, and Polyarthra sp. and Diaphanosoma brachyurum were found to be the most dominant species. Waterside area of each wetland were occupied by a total of 10 macrophyte species, species composition and biomass (dry weight) were different in the survey sites. Zooplankton was more abundant in waterside zone than open water zones lacking macrophytes (One-way ANOVA, df=2, F=27.1, P<0.05), in particular, waterside zone of 1, 8, 9, 10, and 11 wetland were supported by high zooplankton density after summer rainfall. This wetlands were developed by various macrophyte species than other wetland, and submerged plant commonly presented. Waterside zones with various macrophyte species provides complexity to the habitat structure, should be utilized as refuge to avoid disturbance such as summer rainfall. The results indicate that macrophytes are the key components to enhance bio-diversity include zooplankton, and the inclusion of diverse plant species in wetland construction or restoration schemes will result in ecologically healthy food webs.

Effects of Physicochemical and Environmental Factors on Spatial and Temporal Variations in Phytoplankton Pigment and its Community Composition in Jinhae Bay (진해만에서 물리화학적 환경요인이 식물플랑크톤 색소 및 군집조성의 시공간적 변화에 미치는 영향)

  • Na, Sujin;Lee, Jiyoung;Kim, Jeong Bae;Koo, Jun-Ho;Lee, Garam;Hwang, Hyunjin
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.27 no.2
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    • pp.340-354
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    • 2021
  • The aim of this study was to investigate the spatial and temporal distribution of phytoplankton biomass and community composition in Jinhae Bay on the southern coast of Korea. Phytoplankton pigment analysis was conducted using ultra performance liquid chromatography (UPLC) were conducted from April to December 2019 at seven stations. Temperature, salinity, and dissolved oxygen (DO) and inorganic nutrients (dissolved nitrogen, dissolved phosphorus, and orthosilicic acid) were measured to investigate the environmental factors associated with the structure of phytoplankton community. Phytoplankton biomass (Chl-a) was the highest in July (mean 15.4±4.3 ㎍/L) and the lowest in December (mean 3.5±0.6 ㎍/L). Fucoxanthin was the most abundant carotenoid and showed a similar variation pattern to Chl-a, peridinin, and Chl-b. Phytoplankton community composition analysis showed that diatoms were a predominant group with an average abundance of 70 % whereas chlorophytes, cryptophytes, and dinoflagellates often appeared with lower averages. Further, the dominance of diatoms was closely correlated with water temperature and N:P ratio, which might be influenced by high temperatures in the summer and nutrient loading from the land. Additionally, freshwater and nutrient input by rainfall was estimated to be the most important environmental factor. Hence, the spatial and temporal variations in the composition of phytoplankton pigments and phytoplankton community were correlated with physicochemical and environmental parameters.

Iron-Limited Biomass Yields of Marine Phytoplankton Clones (철의 첨가량 제한에 따른 해양 식물플랑크톤 단종배양체의 생체량증가)

  • YIH, WONHO;BRAND, LARRY E.
    • 한국해양학회지
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    • v.28 no.2
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    • pp.79-85
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    • 1993
  • The final biomass yields of 16 marine phytoplankton clones were measured in media with different levels of iron and phosphorus concentrations. The biomass yields of oceanic clones were either only slightly limited or not limited by iron, and those of coastal clones were severely limited by iron in all photogenetic groups other than cyanobacteria. By contrast oceanic cyanobacteria clones as well as coastal clones required higher iron concentrations: minimum concentrations of iron addition for detectable growth of the Synchronous species were estimated to fall between $10^{-9}{\;}and{\;}10^{-8}{\;}M$. Not only the habitat differences (oceanic-coastal trends) but also the photogenetic differences of the oceanic phytoplankton species in the response to the iron enrichments deserve very careful attention before ocean iron fertilization.

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Plankton Community in Weir Section of the Nakdong River and Its Relation with Selected Environmental Factors (낙동강 보 구간의 플랑크톤 군집조성과 환경요인에 의한 영향 분석)

  • Seo, Dong-Il;Nam, Gui-Sook;Lee, Sang-Hyup;Lee, Eui-Haeng;Kim, Mirinae;Choi, Jong-Yun;Kim, Jeong-Hui;Chang, Kwang-Hyeon
    • Korean Journal of Environmental Biology
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    • v.31 no.4
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    • pp.362-369
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    • 2013
  • Phytoplankton and zooplankton communities were investigated from 8 weir sites of the Nakdong River system to provide basic information on plankton community after weir construction and to estimate its effects on major water quality parameters. The relationship between plankton community structure and environmental factors was analysed with CCA (Canonical Correspondence Analysis). The results suggested that discharge and total phosphorus and nitrogen concentrations are important factors determining the phytoplankton species composition. For zooplankton community, the difference in discharge between September and October induced different distribution pattern of zooplankton community with more homogeneous distribution with extreme dominance of rotifers during the high discharge season. Chlorophyll a concentration representing phytoplankton biomass has been suggested as the main environmental factor affecting zooplankton community followed by COD and total nitrogen concentration.

Relative Importance of Bottom-up vs. Top-down Controls on Size-structured Phytoplankton Dynamics in a Freshwater Ecosystem: II. Investigation of Controlling Factors using Statistical Modeling Analysis (담수성 식물플랑크톤의 크기별 동태에 대한 상향식, 하향식 조절간의 상대적 중요도 조사: II. 통계 모델링 분석을 이용한 조절인자 분석)

  • Song, Eun-Sook;Lim, Jang-Seob;Chang, Nam-Ik;Sin, Yong-Sik
    • Korean Journal of Ecology and Environment
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    • v.38 no.4 s.114
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    • pp.445-453
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    • 2005
  • Relative importance between bottom-up and top-down controls on phytoplankton dynamics was investigated in the Juam Reservoir, Chonnam based on the results from statistical analyses including regression and artificial neural network (ANN) modeling. Effects of nutrients on size-structured phytoplankton dynamics were explored by simple linear regression analysis and relative importance between bottom-up and top-down controls was estimated based on results from the artificial neural network analyses. Although there is a limitation in determining direct grazing effects since chlorophyll a : pheopigments ratios, indirect index for grazing activity rather than grazing rates or herbivores biomass were used, the results from regression analysis showed that nutrients especially orthophosphates were positively correlated with the phytoplankton biomass and chlorophyll a : pheopigments ratios were also positively correlated with the phytoplankton biomass at lower coefficient of determination ($r^2$) compared to orthophosphates. The simulation results from ANN suggested that the bottom-up mechanisms including water temperature and availability of nutrients, especially orthophosphates were more important than top-down mechanisms such as grazing in the phytoplankton dynamics.

Occurrence Patterns of Zooplankton Present in Ports of Korea during Summer (한국 주요 항에 출현하는 하계 동물플랑크톤 군집 특성)

  • Seo, Min Ho;Shin, Kyeongsoon;Jang, Min-Chul;Soh, Ho Young
    • Korean Journal of Environmental Biology
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    • v.31 no.4
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    • pp.448-457
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    • 2013
  • Zooplankton community in the major ports of Korea, which were characterized by a specific marine environmental condition during summer, was studied. Water temperature in the ports of western areas was higher and while those in the East Sea was lower. Contradictorily, the salinity was lowest in the western areas, while being highest in the eastern area. The Chl-a concentration was highest in the southern areas and lowest in the eastern one. Zooplankton taxa were most diverse in the western areas and simplest in the eastern one. Copepods predominantly occurred in the western areas, but their abundance relatively decreased in the southern and eastern areas. Cluster analysis revealed that copepod communities were classified into 3 summit groups, the western, southern and eastern areas. The results indicate that zooplankton communities in Korean ports may be affected by biological factors like Chl-a concentration in addition to environmental factor such as temperature and salinity.

Seasonal Characteristics of Phytoplankton Distribution in Asan Bay (아산만 식물플랑크톤의 계절별 군집 분포 특성)

  • Yi, Sang-Hyon;Sin, Yong-Sik;Yang, Sung-Ryull;Park, Chul
    • Ocean and Polar Research
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    • v.27 no.2
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    • pp.149-159
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    • 2005
  • Samples were collected from five stations in February, May, July, and September 2004 to investigate seasonal variations in the phytoplankton community and the relationship between dominant genera and environmental factors in Asan Bay. In February, microphytoplankton contributed 80% to the total chlorophyll a. Diatom dominated the phytoplankton community, accounting for 85.9% of the total cell number, followed by dinoflagellates (6%). Dominant species were Skeletonema costatum and Thalassiosira spp. Abundant diatom, including S. costatum and Thalassiosira spp., may be affected by water temperature and silicate at Station 1 and 2 in February 2004. In May, the nanophytoplankton contribution to total phytoplankton was higher than in other seasons. However, abundance of S. costatum and Thalassiosira spp. decreased, since the growth of S. costatum and Thalassiosira spp. might be limited by phosphates (P) resulting from low P concentration and a high DIN:DIP ratio in the outer region. In July, dominant phytoplankton groups were diatom (39%), cryptophyceae (28%), and cyanophyceae (20%). Dominant genera were Oscillatoria spp. and phytoflagellate of a monad type in the inner region (Station 1 and 2), whereas S. costatum was dominant in the outer region (Station 4 and 5). In September, dominant phytoplankton were diatom (69%) and cryptophyceae (28%). Dominant genera were phytoflagellate of the monad type, S. costatum in the inner region, while Chaetoceros spp. was dominant in the outer region.

Changes in Mesozooplankton Community Around the Rainy Season in Asan Bay, Korea (아산만 해역에서 장마기 전후 중형동물플랑크톤 군집의 변화)

  • Lee, Doo-Byoul;Park, Chul;Yang, Sung-Ryull;Shin, Yong-Sik
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.12 no.4
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    • pp.337-348
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    • 2007
  • Characteristics in distributions of T, S, nutrients, chlorophyll ${\alpha}$ concentrations and meso-zooplankton abundances and the relations among these parameters were investigated with the data collected in Asan Bay around the rainy season from May 24 till August 25, 2006 at about 10 days interval. Freshwater input during the rainy season clearly affected the distributions of zooplankton and phytoplankton (chlorophyll ${\alpha}$). Freshwater discharge resulted in high nutrients decreased zooplankton abundances. On the contrary, chlorophyll ${\alpha}$ concentrations increased at the end of the rainy season. It seemed that the increase of chlorophyll ${\alpha}$ concentrations was the result of the decreased zooplankton and enriched nutrients caused by freshwater discharges. Seawater temperatures were certainly the reason for the zooplankton succession. However, overall abundance of zooplankton and abundances of some zooplankton such as Noctiluca scintillans, Acartia pacifica, and Sagitta crassa seemed to be influenced by lowered salinity caused by heavy rain rather than seawater temperatures.

Correlations between Cell Abundance, Bio-volume and Chlorophyll $a$ Concentration of Phytoplankton Communities in Coastal Waters of Incheon, Tongyeong and Ulsan of Korea (식물플랑크톤 군집의 개체수, 생체량, chlorophyll $a$의 상관성; 인천, 통영, 울산 해역을 중심으로)

  • Joo, Hyoung-Min;Lee, Jin-Hwan;Jung, Seung-Won
    • Korean Journal of Environmental Biology
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    • v.29 no.4
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    • pp.312-320
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    • 2011
  • In order to estimate a better methodological factor to understand phytoplankton ecology between abundance and bio-volume of phytoplankton, each 1,160 phytoplankton data, including abundance, classification and chlorophyll $a$ concentration were collected in Korean coastal waters of Incheon (Yellow sea), Tongyeong (South sea), and Ulsan (East sea). Based on these data, phytoplankton bio-volume can be calculated through a geometric model. The correlation coefficient between abundance and chlorophyll $a$ concentration was higher than the coefficient between biovolume and chlorophyll $a$ concentration, because a small size phytoplankton has relatively dense chlorophyll contents compared with the proportion of chlorophyll in a large size phytoplankton. Thus, the interpretation using abundance to understand phytoplankton ecology in Korean coastal waters may be more effective than that using bio-volume.