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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Phycology
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Volume & Issues
Volume 15, Issue 6 - 00 2000
Volume 15, Issue 4 - 00 2000
Volume 15, Issue 3 - 00 2000
Volume 15, Issue 2 - 00 2000
Volume 15, Issue 1 - 00 2000
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Cyanobacterial Crust in Hong Kong and Comments on Future Research
Ronald D. Hill ; Sanjay Nagarka ; Mervyn R. Peart ;
ALGAE, volume 15, issue 2, 2000, Pages 65~65
The existence of cyanobacterial crust in Hong Kong under both experimental and natural conditions was noted. Thirty-three cyanobacterial species were identified from the soil surface at the site of an erosion experiment. Eleven species were unicellular and 22 filamentous. Fourteen were non-heterocystous and 8 heterocystous cyanobacterial species. None of the species were obligate terrestrial species. Species abundance was measured for one year, and clear seasonal and aseasonal groups of species were established. Macro-environmental data were reported, including soil characteristics, rainfall, rainfall variability and pH, both soil and surface runoff. While the crusts appeared to be fairly stable, except at typhoon intensities, further work is needed to establish degrees of temporal and spatial variation. Non-crust forming cyanobacteria grew on the soil surface under grass and fern. We discuss the future research outlining the potential uses of cyanobacteria in substrate remediation both as an aid to aggregate stability on cut slopes and as a means of accelerating natural plant succession on cut and cement plastered slopes.
Impact of Curde Oil and Dispersant in Determinaton of Calcium Concentration in Shole Cell from Cochodinium polykrikoides
조은섭 ; 강동우 ; 조용철 ;
ALGAE, volume 15, issue 2, 2000, Pages 73~73
The effects of Kuwait crude oil and World Clean 90 dispersant on Ca^(++) flux in Cochlodinium polykrikoides were studied using flow cytometry and confocal microscope. Sugar composition and moieties on the cell surface were examined using fluorescent-tagged lectins. Cells showed no difference in forward light scatter and side-angle scatter (FSC-SSC) plot between control and crude oil or dispersant treated cells. In FSC and SSC, treatment with calcium ionophore (A23187) or without phorbol 12-myristate 13-acetate (PMA) or ionomycin showed that most of the plankton were dead and planktons treated with crude oil or dispersant also showed some dead cells, indicating a too high Ca^(++) flux. Relative fluorescence intensity (RFI) in calcium labelling intensity showed that cells treated with dispersant had increased significantly in number, compared with crude oil. In lectin binding test, cells treated with crude oil and dispersant gave the same positive response, even with exposure to a high concentration of crude oil and dispersant. Considering these results, treatment with high concentration of the dispersant cause a significant increase in Ca^(++) influx, which effects the regulation of the transport ion channels across a membrane. Thus, the toxic effects of dispersant on C. polykrikoides at high concentrations were possibly because of an increase of calcium ion in the cells. Crude oil and dispersant did not effect sugar distribution on the cell surface.
Effect of Inorganic Nutrients and Heavy Metals on Reproduction of the Green Alga, Ulva pertusa Kjellman
김장균 ; 한태준 ;
ALGAE, volume 15, issue 2, 2000, Pages 81~81
Recent concern over marine pollution has developed great attention on likely alteration of ecosystems thereof. Considering that distributional ranges of seaweed species are governed by their success or failure of reproduction, intertidal green alga, Ulva pertusa, was studied to evaluate reproductive responses to environmental pollutants.Percent of sporulation and spore release of U. pertusa grown in the east seawater were higher than those in the west seawater at irradiances higher than 100 μ㏖·m^(-2)·s^(-1). In the east seawater medium, optimal photon irradiance for reproduction was found to be at 100 μ㏖·m^(-2)·s^(-1) whereas in the west seawater, that was 30 μ㏖·m^(-2)·s^(-1). Total quantum requirements for sporulation and spore release were much lower in the east seawater than the west seawater, which suggests that reproduction may be influenced by water turbidity.When U. pertusa was exposed in batch cultures to various concentrations of nitrate and phosphate at 100 μ㏖·m^(-2)·s^(-1) of white light, the rate of reproduction was markedly higher in nutrient-added conditions compared with controls with no nutrients. As nitrate concentration increased, the reproductive rate of U. pertusa increased in all cultures of phosphate concentrations indicating that nitrate but not phosphate plays an important role in reproductive process. When copper and lead in combination were added to U. pertusa, percent sporulation and spore release were solely dependent on copper concentration. Sporulation and spore release at 0.01 ppm of copper reached about 80% which was similar to that in control, but no sign of reproduction was found at 0.1 ppm of copper. It can therefore be speculated that reproduction is more sensitive to copper than growth in U. pertusa in view of the previous report that 0.1 ppm of copper was not inhibitive to growth.
Water Quality and Phytoplankton Communities in Yeoja Bay of Korea
이진환 ; 윤수미 ;
ALGAE, volume 15, issue 2, 2000, Pages 89~89
In order to find out the water quality, dynamics and structure of phytoplankton communities and red-tides, the present study was carried out on a monthly basis from July to September 1998 at 21 stations in the Yeoja Bay. Water temperature varied from 22.5℃ to 28.1℃ and the salinity ranged from 7.1‰ to 29.0‰. Concentrations of nutrients such as nitrogen and phosphate were high in the inner Bay. Phytoplankton were composed of 2 divisions, 3 classes, 7 order, 5 suborder, 18 families, 3 subfamilies, 34 genera, 75 species, 5 varieties, 5 forms and 2 unknown species. These taxa were composed of 70 diatoms, 15 dinoflagellates, and 2 silicoflagellates. Phytoplankton standing crops varied from minimum of 4.8 × 10³ cells·ℓ^(-1)(Aug., St. 18) to maximum of 2.8 × 10^6 cells·ℓ^(-1)(July, St. 17), showing red tide in July and average standing crops of 1.6 × 10^6 cells·ℓ^(-1). The leading causative organisms of red tide were Thalassiosira weissflogii in the inner Bay, Chaetoceros decipiens and C. curvisetus were in the mouth and in the middle part of the Bay. It can be assumed that red tide due to T. weissflogii in July was caused by high concentration of nutrients and low salinity brought on by surface runoff.
The Ecology of Phytoplankton in the Naktong Estuary
정익교 ; 강영작 ; 권오섭 ; 서정관 ;
ALGAE, volume 15, issue 2, 2000, Pages 99~99
The ecology of phytoplankton has been studied in the vicinity of Naktong Estuary in 1999. The temperature ranged between 7.7 and 25.3℃ and salinity varied from 3.89 to 33.62‰. The depth profiles of temperature and salinity have been significantly affected by the Naktong River barrage operations. The outflow of freshwater after the opening of barrage gate significantly influenced the water quality, the composition and biomass of phytoplankton community .The general pattern of phytoplankton community was similar to those found in the coast and embayment of Korea. The chlorophyll n biomass varied from 0.27 ㎍·ℓ^(-1) to 60.16 ㎍·ℓ^(-1). The contribution of picoplankton was not important except in the winter and early spring season (up to 25.0%), and showed the year-round average of 6.8%. The nano- and microplankton showed 45.2% and 48.0% contribution. They showed the strong reverse relationship between the contribution of nano- and microplanakton in terms of chlorophyll a biomass. The changes in nanoplankton biomass showed significant positive correlations with temperature and negative correlations with salinity at St. 2.The patterns of changes in the cell counts were similar to those of chlorophyll α contents except in the winter and early spring. The spring bloom was dominated by several diatom species such as Aulacoseira granulata var. angustissima, Synedra aces and Chaetoceros sp. Ceratium fusus and C. furca was dominant only in summer season. Skeletonema costatum began to increase in late summer and became a dominant species in fall bloom with Chaetoceros sp.
Marine Benthic Algal Community at Padori, West Coast of Korea
이재완 ; 오병건 ; 이해복 ;
ALGAE, volume 15, issue 2, 2000, Pages 111~111
An intertidal marine benthic algal vegetation at Padori, west coast of Korea was investigated to clarify the pattern of community structure from December, 1997 to September, 1998. As a result, a total of 50 algal species - 6 greens, 15 browns and 29 reds - was identified. In vertical distribution of intertidal marine algae, Gloiopeltis furcata was at the upper, Sargassum thunbergii and Corallina pilulifera at the middle, and S. thunbergii and Hizikia fessiforrnis at the lower zones, respectively. The dominant species was Corallina pilulifera, and the subdominants were S. thunbergii, Chondrus ocellatus, Ulva pertusa and Hizikia fusiformis. The biomass of the algal community on an average was 123.2 g·㎡ in dry matter. Comparing the result of this study to those of five and ten years ago, the number of species and the biomass markedly decreased. In the analysis of the functional group form of marine benthic algae, the filamentous and the foliose algae relatively decreased, whereas the leathery macrophytes increased in species composition. The composition of seaweed flora was changed from the mixed to the subpolar-temperate flora.
Studies on the Seaweeds in the Islands of Ullungdo and Dokdo: I. Decrease of Algal Species Compositions and Changes of Marine Algal Flora
김미경 ; 김기태 ;
ALGAE, volume 15, issue 2, 2000, Pages 119~119
We observed the algal species compositions and the marine algal flora in the Islands of Ullungdo and Dokdo in May, June, August and November, 1999. The total number of marine algal species was 56 species composed of the brown algae of 22 species, the red algae of 28 species and the green algae of 6 species. Among them, 53 species Here recognized in Ullungdo and 24 species in Dokdo. The sudden decrease of the algal species was distinguished as comparing with the results of the previous research. We should suppose the reason why the number of the algal species decreases was due to the whiting event which dispersed in the littoral zone. The dominant algal species of Ullungdo and Dokdo were Eisenia bicyclis and Sargassum sp. of brown algae, Pachymeniopsis lanceolata, Chondria crassicaulis, Chondrus ocellatus, Corallina officinalis and C. pilulifera of red algae and Cladophora opaca, Codium fragile, Enteromorpha compressa and E. linza of green algae.