[논문]남해 해역의 해양환경변화가 시아노박테리아 개체수와 군집 조성에 미치는 영향

원종석; 이연정; 이호원; 노재훈

doi:10.4217/opr.2021.43.4.279

남해 해역의 해양환경변화가 시아노박테리아 개체수와 군집 조성에 미치는 영향
Effect of Marine Environment Changes on the Abundance and Community Composition of Cyanobacteria in the South Sea of Korea 원문보기

Ocean and polar research, v.43 no.4, 2021년, pp.279 - 293

원종석 (한국해양대학교 해양과학기술전문대학원 해양과학기술융합학과) , 이연정 (한국해양과학기술원 해양생태연구센터) , 이호원 (한국해양과학기술원 해양생태연구센터) , 노재훈 (한국해양대학교 해양과학기술전문대학원 해양과학기술융합학과)

Abstract ▼ AI-Helper

To investigate the effect of seasonal marine environment conditions on the cyanobacteria abundance and diversity in the South Sea, four-seasonal surveys were conducted along the 127.5°E survey transect line in the central South Sea using flow cytometry and 16S-23S ITS on the Miseq platform from August 2016 to May 2017. The average abundance of Synechococcus varied from 3.3 × 103 to 7.4 × 104 cells ml-1. The abundance was the highest in the summer and the lowest in the winter, and the abundance fluctuated according to water temperature. The abundance was high in the outer sea affected by TWC. However, in summer, the Coastal areas affected by the Yangtze River were more populated than the outer sea. Prochlorococcus was rare and could not penetrate into coastal areas due to the fronts, but showed its dominance in the waters influenced by the TWC. Synechococcus clades II, VII, IX, CRD1, and CRD2 were predominant in the outer sea area affected by the TWC. In the coastal area, clades I and IV showed higher dominance whereas clades V, VI, WPC1, and 5.3-MS3 with euryhaline characteristics, showed a high dominance rate in the water masses affected by the low-salinity water of the Yangtze River in the summer. Clade XVI, XVII, CB1, CB5, and 5.3-I/II showed high dominance in nutrient-rich waters in the summer with increased water temperature. The abundance and community composition of cyanobacteria changed in the South Sea due to the influence of the TWC and stratification. In the summer, the abundance and the community composition differed, and were mainly affected by the general influence of the TWC in addition to the influence of the Yangtze River low-salinity water.

주제어

표/그림 (12)

그림 Fig. 1. Location map of sampling stations (red dots in sampling transect) during four cruises in the South Sea of Korea. The color scale bar represents the depth of the survey area
그림 Fig. 2. Contour plots showing the variation of (A) temperature and (B) salinity along the transect for each survey period. Vertical lines and gray shaded area represent depths with CTD data and sea bottom, respectively. From left to right: (a) February (winter) 2017, (b) May (spring) 2017, (c) August (summer) 2016, and (d) November (fall) 2016. Station F17 of November 2016 survey was not sampled
표 Table 1. Values (Mean±SD) of environmental factors (Temperature, salinity, nitrate and Phosphate) for each group obtained from the cluster analyses (Fig. 4). Bold-letter clusters indicate those samples analyzed to be affected by the TWC
그림 Fig. 3. Contour plots showing the variation of (A) nitrate and (B) phosphate concentrations along the transect for each survey period. Black dots indicate sampling depths. From left to right: (a) February (winter) 2017, (b) May (spring) 2017, (c) August (summer) 2016, and (d) November (fall) 2016. Station F17 of November 2016 survey was not sampled
그림 Fig. 4. Contour plots showing the variation of (A) total chlorophyll a concentration, (B) Synechococcus and (C) Prochlorococcus abundance along the transect for each survey period. Black dots indicate sampling depths. From left to right: (a) February (winter) 2017, (b) May (spring) 2017, (c) August (summer) 2016, and (d) November (fall) 2016. Station F17 of November 2016 survey was not sampled. Note that the scales are different for each survey period to accommodate the spatial difference
그림 Fig. 5. Seasonal average composite images of sea surface temperature (°C) (A) around the South Sea and (B) close-up view of each rectangular box shown in (A). Note the scale bars are different to reflect the seasonal range
그림 Fig. 6. The dendrogram from the cluster analysis based on the community structure of cyanobacteria clades for each depth layer separately for (A) February (winter) 2017, (B) May (spring) 2017, (C) August (summer) 2016, and (D) November (fall) 2016. Bold letters in the dendrogram indicate divided clusters. The thick black lines indicate a similarity of 75%
그림 Fig. 7. Sectional distribution of clusters derived from the cluster analyses shown in the Fig. 6
그림 Fig. 8. T-S diagram of sampling depths for cyanobacterial parameters in each seasonal surveys: (A) February (winter) 2017, (B) May (spring) 2017, (C) August (summer) 2016, and (D) November (fall) 2016. Color circles indicate groups of the same cluster obtained in the cluster analyses in Fig. 4. In November 2016 and May 2017, non-clustered samples were excluded. The color of each symbol and color bar represent the nitrate concentration (μM)
표 Table 2. Relative percentages of cyanobacterial clades (Mean±SD) f or each group obtained from the cluster analyses (Fig. 4 ). B old-letter clusters indicate those samples analyzed to be affected by the TWC. Only clades that have dominance of more than 1% at least one sample are shown. ND, ≤ 0.1%
그림 Fig. 9. Seasonal average composite images of chlorophyll a concentration (mg m^-3) (A) around the South Seaand (B) close-up view of each rectangular box shown in (A). Note the scales of (A) and (B) are different
그림 Fig. 10. Redundancy analysis (RDA) ordination plot for the first 2 dimensions of the relationship between cyanobacterial composition and environmental parameters. The red and blue circles indicate a clade belonging to Prochlorococcus and Synechococcus, respectively

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저자의 다른 논문 :

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