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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Ocean and Polar Research
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Journal DOI :
Korea Institute of Ocean Science & Technology
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Volume & Issues
Volume 34, Issue 4 - Dec 2012
Volume 34, Issue 3 - Sep 2012
Volume 34, Issue 2 - Jun 2012
Volume 34, Issue 1 - Mar 2012
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Seasonal Variation of Mesozooplankton Communities in the Semi-enclosed Muan Bay, Korea
Moon, Seong-Yong ; Seo, Min-Ho ; Shin, Yong-Sik ; Soh, Ho-Young ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 1~18
DOI : 10.4217/OPR.2012.34.1.001
We investigated seasonal changes in the mesozooplankton community structure in November 2006 and February, May, and August 2007 at 12 stations in the semi-enclosed Muan Bay, Korea. Forty taxa were sampled, with an average abundance ranging from 1,459 to 20,078 indiv.
; the highest abundance was detected in August 2007, and the lowest in February 2007. Acartia omorii, A. hudsonica, A. ohtsukai, Bestiolina coreana, Calanopia sp., Paracalanus parvus s. l., Cirripedia larvae, Decapoda larvae, and Gastropoda larvae were the most abundant taxa detected. The species diversity of the mesozooplankton was high around the inner regions in August 2007 but it was relatively low in November 2006. Non-metric multidimensional scaling (nMDS) revealed significant differences in the structure of mesozooplankton community among the seasons. Canonical correspondence analysis (CCA), performed to examine the relationships among dominant taxa, stations, and environmental variables, showed that most species of copepods were positively correlated with temperature, salinity, chlorophyll a, and COD concentration. Our results suggested that the mesozooplankton community structure observed in this study might be affected partly by the seasonal changes in environmental variables, such as the status of the sluice gates (i.e., open or closed) and the in situ production of resting eggs by major copepods.
Picocyanobacterial Diversity and Distribution During Summer in the Northern East China Sea
Choi, Dong-Han ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 19~28
DOI : 10.4217/OPR.2012.34.1.019
In order to understand the spatial distribution of picocyanobacterial diversity during the summer in the northern East China Sea (ECS), their abundance and genetic diversity were investigated using flow cytometry and barcoded amplicon pyrosequencing of 16S-23S internal transcribed spacer sequences. Synechococcus abundance was high, with a range of
. However, Prochlorococcus were found only in the eastern part of the studied area, showing a marked variation among stations [range of n.d. (not detected) to
]. Eleven Synechococcus clades and five Prochlorococcus ecotypes were found to have a proportion higher than 1% among picocyanobacterial sequences, indicating high picocyanobacterial diversity in the ECS. The picocyanobacterial compositions were markedly different among stations, as well as among depths. Inflow of the Tsushima Warm Current and Changjiang diluted water was of primary importance in determining picocyanobacterial lineage diversity in the studied area. In addition, light intensity and nutrient conditions also appeared to be important in the vertical and horizontal distribution of picocyanobacterial diversity.
Relationship between Interannual Variability of Phytoplankton and Tropical Cyclones in the Western North Pacific
Park, Jong-Yeon ; Kug, Jong-Seong ; Park, Ji-Soo ; Chang, Chan-Joo ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 29~35
DOI : 10.4217/OPR.2012.34.1.029
We investigated the interannual relationship between chlorophyll concentrations in the western North Pacific and tropical cyclones (TCs) in the western North Pacific by analyzing data collected for >12 years. Despite the short-term scale (2~3 weeks) in the contribution of tropical cyclones to phytoplankton, the current study revealed that the long-term chlorophyll variability in the western North Pacific is profoundly related to long-term variability in the frequency of TCs. It was also found that the Pacific decadal oscillation (PDO) tends to control such relationships between the 2 bio-physical systems. This result suggests a significant climatic relationship between TC activity and marine phytoplankton, and also suggests the possibility of more accurate estimations of primary production in the western North Pacific.
Patterns of Zooplankton Distribution as Related to Water Masses in the Korea Strait during Winter and Summer
Jang, Min-Chul ; Baek, Seung-Ho ; Jang, Pung-Guk ; Lee, Woo-Jin ; Shin, Kyoung-Soon ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 37~51
DOI : 10.4217/OPR.2012.34.1.037
We investigated the distribution and species composition of zooplankton in relation to hydrographical characteristics in the Korea Strait during the winter (February) and summer (July) of 2009. Satellite images of sea surface temperatures and in situ CTD data showed that the southeastern water zone (St3-5) off Jeju Island was strongly influenced by the Tsushima Current during both the winter and summer, whereas the Changjiang Diluted Water, characterized as water with relatively low salinity, was evident in the coastal waters of Jeju Island during the summer. During winter, zooplankton abundance was significantly higher than in the summer, with dominance by copepods, ostracods, siphonophorans, appendicularians, and nauplii. In both seasons, copepods represented >70% of the total zooplankton population. Calanus sinicus, a large calanoid copepod, was dominant in near the coast, and that may be associated with the intrusion of low salinity water (i.e., the Changjiang Diluted Water) along the coast. The abundance of P. parvus s.l. and A. omorii, known as neritic copepods, was mainly associated with the Korea Southern Coastal Water. Foraminiferans, Ostracods, O. plumifera, and P. aculeatus were concentrated in the southeastern water off Jeju Island during both seasons; showing their association with the Tsushima Current, which is characterized warm, high salinity water. Our results suggest that the distribution, abundance, and species composition of zooplankton are highly influenced by different water masses in the Korea Strait.
The Formation of Hypoxia Sediment and Benthic Foraminiferal Change in Gamak Bay, Southern Coast of Korea
Lee, Yeon-Gyu ; Jeong, Da-Un ; Kang, So-Ra ; Kim, Yong-Wan ; Kim, Shin ; Jung, Eun-Ho ; Lee, Jung-Sick ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 53~64
DOI : 10.4217/OPR.2012.34.1.053
In order to understand the relationship between the formation of hypoxia sediment by eutrophication and changes in benthic foraminiferal assemblage, micropaleontological and geochemical analyses were carried out on one sediment box core (K-1) recovered in the northern Gamak Bay, which is one of the aquacultural areas in the South Sea of Korea. In this analysis, the PON content in the sediment rapidly increased, while the C/N ratio and the C/S ratio decreased since 1977. These results indicate that eutrophication commenced in 1977 in the northern Gamak Bay, and consequently, the hypoxia sediment is 20 cm thick. Ammonia beccarii-Buccella frigida assemblage occurs before the formation of hypoxia sediment. Trochammina hadai-Buccella frigida assemblage appeared in the transitional period toward hypoxia and Trochammina hadai assemblage with a low abundance and diversity is observed in the hypoxia sediment. The agglutinated species T. hadai is regarded as a bio-indicator (opportunistic species) of the organic pollution in northern Gamak Bay.
Occurrence of the Toxic Benthic Dinoflagellate Gambierdiscus spp. in the Uninhabited Baekdo Islands off Southern Coast and Seopsom Island in the Vicinity of Seogwipo, Jeju Province, Korea
Baek, Seung-Ho ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 65~71
DOI : 10.4217/OPR.2012.34.1.065
Gambierdiscus toxicus, Adachi et. Fukuyo, is a benthic ciguatoxin-producing armored dinoflagellate, often attached to macroalgae. This organism is the primary causative agent of ciguatera fish poisoning which occurs in tropical and subtropical regions. However, regardless of the fact that the population of Gambierdiscus spp. has expanded to such temperate areas from sub-trophic and trophic areas, monitoring of G. toxicus has been lacking in the Korean coastal waters of temperate areas. This study was performed at the uninhabited Baekdo Islands off the southern coast of Korea and at Seopsom Island in the vicinity of Seogwipo, Jeju Province during April and May, 2011. Cell densities of Gambierdiscus spp. on macroalgae at Baekdo and Jeju Island ranged from zero to 56.4 cells
. Maximum density was recorded on the brown alga Cladophora japonica at St. 3 of Jeju Island. In particular, the cell densities of Gambierdiscus spp. were influenced by the substrate characteristics of macroalgae. In the future, the continuous monitoring of toxic benthic dinoflagellate is necessary to predict and prevent ciguatera poisoning in Korean coastal waters.
Change of Temperature using the Twentieth Century Reanalysis Data (20CR) on Antarctica
Zo, Il-Sung ; Jee, Joon-Bum ; Lee, Kyu-Tae ; Chae, Na-My ; Yoon, Young-Jun ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 73~83
DOI : 10.4217/OPR.2012.34.1.073
Antarctica is very sensitive to climate change but the number of stations is not sufficient to accurately analyze climate change in this regoin. Model reanalysis data supplements the lack of observation and can be used as long term data to verify climate change. In this study, the 20CR (Twentieth Century Reanalysis) Project data from NCEP/NCAR and monthly mean data (temperature, solar radiation and longwave radiation) from 1871 to 2008, was used to analyze the temperature trend and change in radiation. The 20CR data was used to validate the observation data from Antarctica since 1950 and the correlation coefficients between these data were determined to be over 0.95 at all stations. The temperature increased by approximately
/decade during the study period and over
/decade over all of the months. This increasing trend was observed throughout the Antarctica and a slight increase was observed in the Antarctic Peninsula. In addition, solar radiation (surface) and longwave radiation (surface and top of atmosphere) trends correlated with the increase in temperature. As a result, outgoing longwave radiation at the surface is attenuated by atmospheric water vapor or clouds and radiation at the top of the atmosphere was reduced. In addition, the absorbed energy in the atmosphere increases the temperature of the atmosphere and surface, and then the heated surface emits more longwave radiation. Eventually these processes are repeated in a positive feedback loop, which results in a continuous rise in temperature.
Measurements of Sound Speed and Density Contrasts of the Moon Jellyfish (Aurelia aurita s.l.) for Hydroacoustic Model
Kang, Don-Hyug ; Lee, Chang-Won ; Lee, Hyung-Been ; Kim, Mi-Ra ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 85~91
DOI : 10.4217/OPR.2012.34.1.085
Physical properties such as sound speed contrast (h) and density contrast (g) of the interested target are key parameters to understand acoustic characteristics by using theoretical scattering models. The density and sound speed of moon jellyfish (common jellyfish, Aurelia aurita s.l.) were measured. Sound speed contrast (h) was measured from travel time difference (time-of-flight method) of an acoustic signal in a water tank for APOP studies (Acoustic Properties Of zooplankton). Density contrast (g) was measured by the displacement volume and wet weight (dual-density method). The sound speed remained almost constant as the moon jellyfish increased in bell length. The mean values
standard deviation of h and g were
), respectively. These results will provide important input for use in theoretical scattering models for estimating the acoustic target strength of jellyfish.
The Influence of Water Temperature and Body Weight on Metabolic Rate of Olive Flounder Paralichthys olivaceus
Oh, Sung-Yong ; Jang, Yo-Soon ; Park, Heung-Sik ; Choi, Young-Ung ; Kim, Chong-Kwan ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 93~99
DOI : 10.4217/OPR.2012.34.1.093
The effect of water temperature and body weight on oxygen consumption by the fasted olive flounder Paralichthys olivaceus was investigated in order to assess the metabolic rate of this species under different conditions. The oxygen consumption rate (OCR) was measured at three different water temperatures (15, 20 and
) and two different body weights [
SD) for the juvenile group and
g for the immature group] at an interval of 5 minutes for 24 hours using a closed flow-through respirometer. For each treatment condition, three replicates were set up and 135 fish in the juvenile group and 18 fish in the immature group were used. The OCRs exhibited a linear increase described by OCR=-82.06+28.30T (
=0.96, p<0.001) in the juvenile group and OCR=-52.52+14.73T (
=0.97, p<0.001) in the immature group. The OCRs decreased with increasing body weights at a given water temperature (p<0.001). The metabolic rate was related to the body weight of the fish as a power function with a weight exponent of between 0.77 and 0.82.
values ranged 1.67~2.28 when the temperature was between 15 and
, 1.57~1.93 when the temperature was between 20 and
, and 1.79~1.89 when the temperature was between 15 and
. The energy expenditure by respiration increased with increasing water temperature and decreasing body weight (p<0.001). The mean energy loss rates at 15, 20 and
were 115.9, 149.8 and 208.2 kJ
in the juvenile groups and 53.8, 81.2 and 101.9 kJ
in the immature groups.
List of Korean Names for the Vascular Plants in Spitsbergen Island, in the Arctic Region
Lee, Kyoo ; Han, Dong-Uk ; Hyun, Jin-Oh ; Hwang, Young-Sim ; Lee, Yoo-Kyung ; Lee, Eun-Ju ;
Ocean and Polar Research, volume 34, issue 1, 2012, Pages 101~110
DOI : 10.4217/OPR.2012.34.1.101
In this study, we attempted to provide Korean names to the arctic vascular plants observed around the Dasan Korean Arctic Station and Longyearbyen in Spitsbergen Island, in the Arctic region. To obtain recognizable results, plants were named according to the following naming rules. (1) When Korean names already existed, those names were used. (2) When there was no Korean name for a plant species, a scientific name for the plant was translated into a Korean name. (3) If the meaning of the scientific name was unclear, an English common name was translated into Korean name. (4) If the scientific names had meaning to the Arctic inhabitation, the Korean names included the word 'Buk-geuk'. (5) If the distribution of the plant was limited to the Arctic area or the original species lived in the polar region, the Korean name included the word 'Buk-geuk'. (6) If the plant had no Korean generic name, a particular suffix '~a-jae-bi' was added to the closely related genus name of the plant species, or a new Korean genus name was used by translating a common English name. (7) If the same generic name had two or more Korean names, a generic name that better reflected the characteristics of the plant was selected. In this paper, we reported Korean names for 46 plants species belonging to 15 families and 28 genera. Eight plants had an existing Korean name and the other species were given new Korean names based on the criteria outlined above. We also made new Korean generic names for three genera, Braya, Micranthes and Cassiope.