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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 12, Issue 3 - Sep 1997
Volume 12, Issue 4 - 00 1997
Volume 12, Issue 1 - 00 1997
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Algal Phenotypic Plasticity: Its Importance in Developing New Concepts The Case for Scenedesmus
Morales, Eduardo A. ; Trainor, Francis R. ;
ALGAE, volume 12, issue 3, 1997, Pages 147~147
The phycological literature contains several accounts for the occurrence of phenotypic plasticity, briefly defined as morphological variations induced by changing environmental conditions. However, the potential impact of plasticity on algal systematics has been underestimated. In the past, conventional classification schemes have not been sufficiently flexible to incorporate a rather extensive phenotypic plasticity, resulting in the application of different names to morphs (ecomorphs) of the same species. Research on the green algal genus Scenedesmus has demonstrated the impact of this morphological plasticity on taxonomy at the species level, suggesting possible pathways toward the development of a more natural classification system based on multidisciplinary information.
Taxonomic Studies on Some Species of Pediastrum Meyen in Korea
Kim, Mi-Ran ; Chang, Yoon-Kyung ;
ALGAE, volume 12, issue 3, 1997, Pages 159~159
Twenty-seven strains of Pediastrum were isolated from collections made at twenty-five localities in Korea. The isolates were cultured in the laboratory and classified by observing the process of coenobia formation, shape of the cells and ultrastructure of the cell wall using SEM. Four species and five varieties of Pediastrum were identified. Among them, Pediastrum duplex var. asperum (A. Braun) Hansgirg, P. duplex var. punctatum (Krieger) Parra and P. duplex var. rugulosum Raciborski were reported for the first time in Korea. Ultrastructure of the cell wall, shape of the peripheral cells were the most reliable features in Pediastrum taxonomy.
Taxonomic Implications of the Genus Microcystis (Cyanophyceae) from the Naktong River
Lee, Jin-Ae ; Choi, Ae-Ran ; Watanabe, Masayuki ;
ALGAE, volume 12, issue 3, 1997, Pages 167~167
Six species of the genus Microcystis, M. incerta, M. viridis M. wesenbergii, M. novacekii, M. ichthyoblabe and M. aeruginosa, are described with the samples from the 11 stations of the Naktong River to have taxonomic consideration based on morphological variation in the natural habitat. The criteria of species identification are mainly the cell size and content, the shape of the colony, the nature of colonial sheath and the cell arrangement in of colony. Microcystis aeruginosa is the most common species of the phytoplankton community and the species is the major component of the heavy water bloom in the Naktong River system. The species shows cell size differentiations such as
in diameter. The smaller type of the species is more abundant in the estuary of the Naktong River, which occasionally have salt intrusion from the sea.
Taxonomic Study on the Charophytes in Korea I. Chara and Lamprothamnium
Choi, Kwang-Chul ; Kim, Young-Hwan ;
ALGAE, volume 12, issue 3, 1997, Pages 177~177
The taxa of the Characeae (Charophyts) in Korea were investigated in order to re-evaluate the characteristics of the species and to clarify their taxonomic validity. The materials were collected from July 1993 to August 1996 in all regions of Korea including Cheju Island. The herbarium specimens of Prof. D. Choe who studied Korean Characeae in 1960's were also examined for this study. As a result, five species, two subspecies and three varieties of the genus Chara (C. braunii, C. corallina var. kyusyensis, C. fibrosa ssp. benthamii, C. fibrosa ssp. gymnopitys, C. fibrosa var. microstephana, C. globularis var. globularis, C. globularis var. virgata, C. sejuncta, C. vulgaris, C. zeylanica) and two species of the genus Lamprothamnium (L. papulosum, L. succinctum) were recognized. Among them Chara globularis var. virgata, C. zeylanica, Lamprothamnium papulosum and L. succinctum are recorded for the first time in Korea during this study. A key to the Korean taxa of charophytes is provided. The main habitats and the phenological characteristics of the Korean charophytes are described.
Temperature Responses of Porphyra tenera Kjellman and P. yezoensis Ueda (Bangiales, Rhodophyta) from Korea
Hwang, Mi-Sook ; Chung, Ik-Kyo ; Oh, Yoon-Sik ;
ALGAE, volume 12, issue 3, 1997, Pages 207~207
Temperature responses of the conchosporophytes and gametophytes of Porphyra tenera and P. yezoensis were investigated in culture. The growth of conchosporophytes and the formation of conchosporangial branches were high at
in both species. The conchospore release was high at
in P. tenera and at
in P. yezoensis. Conchosporophytes were tolerant at
for 4 weeks in both species and tolerant up to
in P. tenera and
in P. yezoensis for 2 weeks. The relative growth rates (RGRs) of the gametophytes decreased as they grew. The temperature for the highest RGR of gametophytes was changed from
at the 1st stage (2-4 week) to
in P. tenera and
in P. yezoensis at the 3rd stage (8-10 week). The reproductive structures developed early as temperature increased. Monospores were released not only from the early stage of gametophytes at the condition above
but also from mature plants at the same time of spermatium release at lower temperature. It is apparent that P. tenera and P. yezoensis are well adapted to the temperature variation in nature for the alternation of generations and the growth and reproduction of each generation.
Phytoplankton Communities in Fertilized Fish Ponds: Effects of Different Nutrient Loadings
Kim, Jeong-Ha ; O'Flaherty, Larry M. ;
ALGAE, volume 12, issue 3, 1997, Pages 215~215
Outdoor plastic-lined ponds were used to examine the effect of different regimes of fertilization on phytoplankton community to enhance fish production at the Jake Wolf Memorial Fish Hatchery, Mason County, Illinois, USA. The combinations of organic (i.e. soybean meal, alfalfa pellets) and liquid inorganic (i.e. 10-34-0 of N: P: K) fertilizers and yeast were applied to the four ponds which had initially been supplied by the same water source and treated with the same combination of fertilizers. Two sets of non-replicate comparison were made with two ponds for each case; High vs. Medium loadings of liquid inorganic fertilizers (LIF) and Low vs. Non-loading of LIF with the same amounts of organic fertilizer for each comparison in 1986 and 1987, respectively. The pond with the medium loading of LIF, dominated by Chlorophyta (51.6%) and Bacillariophyta (38.4%), had about five times greater density of phytoplankton than the other pend with two times the amount of LIF, dominated solely by Chlorophyta (73.6%). Levels of dissolved oxygen and pH were proportional to phytoplankton density; however, levels of ammonia and phosphate were much higher. in the pond with the high LIF but with low abundance of phytoplankton. The pond which received the high amount of LIF seemed to be overfertilized and thus the increase of ammonia was correlated with the decrease of phytoplankton, particularly Chlorophyta. These two ponds exhibited different secondary succession of phytoplankton. The pond with the low LIF loadings had greater abundance, higher species diversity and evenness than the pond without LIF. The latter maintained oligotrophic characteristics of water indicated by lower levels of phosphate and the common occurrence of Haematococcus lacustris. The data suggested that the application of medium or small amounts of LIF to these ponds support a greater productivity of phytoplankton and higher diversity of algae which. may enhance zooplankton abundance and fish production as well.
Characteristics of Triacylglycerols and Fatty Acids from Detonula sp. in Culture
Kim, Mi-Kyung ; Dubacq, Jean-Paul ;
ALGAE, volume 12, issue 3, 1997, Pages 229~229
Detonula sp. in Complete Medium(CM) for 4 weeks were cultivated in Nitrogen Absence Medium (NAM) for 3 weeks (state A) and transferred to CM and cultivated for 3 weeks (state B). Their triacylglycerols (TAG) and fatty acids were extracted. The ratio of the amount between triacylglycerols and total lipids (TL) after 4 weeks of the culture was 8.9% in CM
but 33% in NAM
. The amounts of TL and TAG from Detonula sp. in the state A
were abruptly decreased in state B
. The dominant fatty acids were palmitic (C16:0)(27%), palmitoleic (C16:1)(46%) and oleic acid (C18:1)(7.6%) in CM and C16:0 (29%), C16:1 (45%) and linoleic acid (C18:2)(6.7%) in NAM. The C16 of Detonula sp. was abundant but C20 was diminished in CM and NAM for the duration of the culture.