Classification into Two Types Based on the Morphological Characteristics of the Marine Diatom Ditylum brightwellii (West) Grunow in Yellow Sea, Korea

ALGAE ◽  
2007 ◽  
Vol 22 (4) ◽  
pp. 253-259 ◽  
Author(s):  
Jin-Hwan Lee ◽  
Seok-Jea Youn
Keyword(s):  
Yellow Sea ◽  
Morphological Characteristics ◽  
Marine Diatom ◽  
Ditylum Brightwellii

Impact of UV-B Radiation on the Lipid and Fatty Acid Composition of Synchronized Ditylum brightwellii (West) Grunow

1994 ◽  
Vol 49 (9-10) ◽  
pp. 607-614 ◽  
Author(s):  
Günter Döhler ◽  
Thomas Biermann
Keyword(s):  
Cell Cycle ◽  
Fatty Acids ◽  
Dark Period ◽  
Inhibitory Effect ◽  
Light Period ◽  
Marine Diatom ◽  
Lag Phase ◽  
Ditylum Brightwellii ◽  
Acyl Lipids ◽  
The Impact

Abstract The marine diatom Ditylum brightwellii (West) Grunow isolated from the Baltic Sea could be synchronized by a light/dark rhythm of 6.5:17.5 h (white light intensity 8 W m-2) at 18 °C and 0.035 vol.% CO2. Content of protein, DNA and RNA increased linearly up to the end of the cell cycle. Pigments (chlorophyll a, chlorophyll c1 + c2, carotenoids) and galactolipids were synthesized in the light period only. A lag phase of 2 h was observed in the biosynthesis of sulphoquinovosyl diacylglycerol and phosphatidylglycerol. Formation of phosphatidylglycerol and phosphatidylcholin continued in the dark period (30% and 28%, respectively). The pattern of major fatty acids (C14:0, C16:1, C16:0, C18:1 and C20:5) varied during the cell cycle of Ditylum.Biosynthesis of acyl lipids was reduced in dependence on the UV-B dose. The most sensitive lipid was digalactosyl diacylglycerol (total inhibition at 585 J m-2), whereas phosphatidylcholin was less affected (20% reduction). UV-B radiation during the dark period had no effect on the lipid and pigment content. Strongest inhibitory effect of UV-B on cell division, synthesis of protein, pigments, sulphoquinovosyl diacylglycerol and phosphatidylglycerol was found after UV-B radiation at the beginning of the cell cycle (0.-2. h). An exposure time at the end of the light period (4.-6. h) led to a marked damage on the synthesis of monogalactosyl diacylglycerol and phosphatidylglycerol. These findings indicate a stage-dependent response of Ditylum to UV-B irradiance. The impact of UV-B resulted in an increase of unsaturated long chained fatty acids (C18, C20) and in a diminution of short chained fatty acids (C14, C16). Content of ATP was not affected by UV-B radiation under the used conditions. The inhibitory effect of UV-B on synthesis of DNA, RNA, protein and acyl lipids was mainly reversible. Results were discussed with reference to UV-B damage on the enzymes involved in the biosynthesis of acyl lipids and by a reduction of available metabolites.

scholarly journals Spatiotemporal Patterns and Morphological Characteristics of Ulva prolifera Distribution in the Yellow Sea, China in 2016–2018

2019 ◽  
Vol 11 (4) ◽  
pp. 445 ◽  
Author(s):  
Yingzhi Cao ◽  
Yichen Wu ◽  
Zhixiang Fang ◽  
Xiaojian Cui ◽  
Jianfeng Liang ◽  
...  
Keyword(s):  
Yellow Sea ◽  
Vegetation Index ◽  
Morphological Changes ◽  
Surface Wind ◽  
Morphological Characteristics ◽  
Ulva Prolifera ◽  
Spatiotemporal Patterns ◽  
The Yellow Sea ◽  
Green Tide ◽  
Sea Surface Wind

The world’s largest macroalgal blooms, Ulva prolifera, have appeared in the Yellow Sea every summer on different scales since 2007, causing great harm to the regional marine economy. In this study, the Normalized Difference of Vegetation Index (NDVI) index was used to extract the green tide of Ulva prolifera from MODIS images in the Yellow Sea in 2016–2018, to investigate its spatiotemporal patterns and to calculate its occurrence probability. Using the standard deviational ellipse (SDE), the morphological characteristics of the green tide, including directionality and regularity, were analyzed. The results showed that the largest distribution and coverage areas occurred in 2016, with 57,384 km2 and 2906 km2, respectively and that the total affected region during three years was 163,162 km2. The green tide drifted northward and died out near Qingdao, Shandong Province, which was found to be a high-risk region. The coast of Jiangsu Province was believed to be the source of Ulva prolifera, but it was probably not the only one. The regularity of the boundary shape of the distribution showed a change that was opposite to the variation of scale. Several sharp increases were found in the parameters of the SDE in all three years. In conclusion, the overall situation of Ulva prolifera was still severe in recent years, and the sea area near Qingdao became the worst hit area of the green tide event. It was also shown that the sea surface wind played an important part in its migration and morphological changes.

Sabbea gen. nov., a new diatom genus (Bacillariophyta) from continental Antarctica

Phytotaxa ◽  
2019 ◽  
Vol 418 (1) ◽  
pp. 42-56 ◽  
Author(s):  
JORDAN BISHOP ◽  
KATEŘINA KOPALOVÁ ◽  
JOSHUA P. DARLING ◽  
NICHOLAS O. SCHULTE ◽  
TYLER J. KOHLER ◽  
...  
Keyword(s):  
New Genus ◽  
Morphological Characteristics ◽  
Sensu Stricto ◽  
Morphological Features ◽  
Marine Diatom ◽  
Continental Antarctica ◽  
Diatom Genus ◽  
Antarctic Continent ◽  
Vestfold Hills ◽  
The Antarctic

The non-marine diatom flora of the Antarctic Continent includes several endemic taxa recorded over the past 100 years. One of these taxa, Navicula adminensis D.Roberts & McMinn, was described from the Vestfold Hills, East Antarctica. Detailed light and scanning electron microscopy observations have shown that based on its morphological features, the species does not belong to the genus Navicula sensu stricto. To determine the most closely related genera to N. adminensis, the morphological features of Adlafia, Kobayasiella, Envekadea, Stenoneis, Berkeleya, Climaconeis, and Parlibellus were compared with those of N. adminensis. Although each of these genera shows one or more similar features, none of them accommodates the salient morphological characteristics of N. adminensis. Therefore, a new genus, Sabbea gen. nov., is herein described, and Navicula adminensis is formally transferred to the new genus as Sabbea adminensis comb. nov. The genus Sabbea is characterized by uniseriate striae composed of small, rounded areolae occluded externally by individual hymenes, a rather simple raphe structure with straight, short proximal ends and short terminal raphe fissures, open girdle bands with double perforation and a very shallow mantle.

Formation and Regeneration of Abnormal Cells of the Marine Diatom Ditylum Brightwellii (West) Grunow

1980 ◽  
Vol 60 (1) ◽  
pp. 243-253 ◽  
Author(s):  
G. S. Canterford
Keyword(s):  
Heavy Metals ◽  
Ethylenediaminetetraacetic Acid ◽  
Considerable Effect ◽  
Marine Diatom ◽  
Factors Affecting ◽  
Ditylum Brightwellii ◽  
Abnormal Cells ◽  
Total Growth ◽  
Size And Morphology ◽  
Toxic Concentrations

Heavy metals, as well as affecting the growth rate and photosynthesis of algae, have a considerable effect on the size and morphology of algal cells (see, for example, Erickson, 1972; Nuzzi, 1972; Davies, 1974; Kayser, 1976). Changes in the colour of algae in the presence of heavy metals have also been observed (Greenfield, 1942). At metal concentrations resulting in total growth inhibition of algae the cells, although abnormal, are not necessarily dead (see, for example, Nielsen & Kamp-Nielsen, 1970; Erickson, 1972; Nuzzi, 1972; Blankenship & Wilbur, 1975).In heavy-metal toxicity studies with Ditylum brightwellii (West) Grunow (Canterford & Canterford, 1979) it was observed that low concentrations of ethylenediaminetetraacetic acid (EDTA) and toxic concentrations of several heavy metals resulted in the formation of abnormal cells. In the present paper factors affecting the formation of abnormal cells are discussed. Experiments were carried out to establish whether or not these abnormal cells could be regenerated.

scholarly journals First record ofPhyllorhizasp. (Cnidaria: Scyphozoa) in a Chinese coastal aquaculture pond

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6191 ◽  
Author(s):  
Zhijun Dong ◽  
André C. Morandini ◽  
Agustin Schiariti ◽  
Lei Wang ◽  
Tingting Sun
Keyword(s):  
Yellow Sea ◽  
Large Scale ◽  
Phylogenetic Analyses ◽  
Morphological Characteristics ◽  
First Record ◽  
Morphological Characters ◽  
Southern Yellow Sea ◽  
Shrimp Culture ◽  
Aquaculture Pond ◽  
The Southern Yellow Sea

BackgroundIt has been suggested that aquaculture ponds on the Chinese coast could act as breeding grounds for scyphozoans. Here, we present the first record of the scyphomedusaPhyllorhizasp. in an aquaculture pond on the coast of the southern Yellow Sea, based on a combination of morphological characteristics and mitochondrial 16S DNA sequence data.MethodsA field survey was performed on June 29, 2017 in a pond used for culturing the shrimpPenaeus japonicus, located in the southern Yellow Sea, China. Jellyfish specimens were collected for morphological and genetic analysis. The morphological characters of the jellyfish specimens were compared to taxonomic literature. Additionally, phylogenetic analysis of the mitochondrial 16S fragments of these specimens were also conducted.ResultsThese specimens had the following morphological characters: hemispherical umbrella without scapulets; J-shaped oral arms; a single larger terminal club on each arm; bluish colored with a slightly expanded white tip; and mouthlets present only in the lower half to one-third of each arm. These morphological features of the medusae indicated that the specimens found in the shrimp culture ponds belong to the genusPhyllorhizaAgassiz, 1862, but did not match with the description of any of the known species of the genusPhyllorhiza.Phylogenetic analyses of the mtDNA 16S regions revealed that these specimens, together withPhyllorhizasp. from Malaysian coastal waters, belong to a sister group ofPhyllorhiza punctata. Juveniles and ephyrae ofPhyllorhizasp. were observed in the aquaculture pond. The mean density ofPhyllorhizasp. medusa in the surface water within the pond was estimated to be 0.05 individuals/m2.DiscussionBased on our observations of the gross morphology and molecular data, we state that the specimens collected in the aquaculture pond can be identified asPhyllorhizasp. This is the first record ofPhyllorhizasp. in Chinese seas. Large scale dispersal through ballast water or the expansion of jellyfish aquarium exhibitions are possible pathways of invasion, but this needs to be confirmed in further studies.

Effect of temperature on changes in size and morphology of the marine diatom, Ditylum brightwellii (West) Grunow (Bacillariophyceae)

2013 ◽  
Vol 135 ◽  
pp. 128-136 ◽  
Author(s):  
Seung Won Jung ◽  
Seok Jae Youn ◽  
Hyeon Ho Shin ◽  
Suk Min Yun ◽  
Jang-Seo Ki ◽  
...  
Keyword(s):  
Marine Diatom ◽  
Effect Of Temperature ◽  
Ditylum Brightwellii ◽  
Size And Morphology

Morphological Characteristics and Control Factors of Bedforms in Southern Gyeonggi Bay, Yellow Sea

2010 ◽  
Vol 31 (6) ◽  
pp. 608-624 ◽  
Author(s):  
Byung-Cheol Kum ◽  
Dong-Hyeok Shin ◽  
Seom-Kyu Jung ◽  
Yong-Kuk Lee ◽  
Jae-Kyung Oh
Keyword(s):  
Yellow Sea ◽  
Morphological Characteristics ◽  
Control Factors ◽  
And Control
Sign in / Sign up

Export Citation Format

Share Document