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Joo, HuiTae,Park, Jung Woo,Son, SeungHyun,Noh, Jae-Hoon,Jeong, Jin-Yong,Kwak, Jung Hyun,Saux-Picart, Stephane,Choi, Jung Hwa,Kang, Chang-Keun,Lee, Sang Heon American Geophysical Union 2014 Journal of geophysical research. Oceans Vol.119 No.5
Although the Ulleung Basin is an important biological hot spot in East/Japan Sea (hereafter the East Sea), very limited knowledge for seasonal and annual variations in the primary productivity exists. In this study, a recent decadal trend of primary production in the Ulleung Basin was analyzed based on MODIS-derived monthly primary production for a better annual production budget. Based on the MODIS-derived primary production, the mean daily primary productivity was 766.8 mg C m-2 d-1 (SD=+/- 196.7 mg C m-2 d-1) and the annual primary productivity was 280.2 g C m-2 yr-1 (SD=+/- 14.9 g C m-2 yr-1) in the Ulleung Basin during the study period. The monthly contributions of primary production were not largely variable among different months, and a relatively small interannual production variability was also observed in the Ulleung Basin, which indicates that the Ulleung Basin is a sustaining biologically productive region called as hot spot in the East Sea. However, a significant recent decline in the annual primary production was observed in the Ulleung Basin after 2006. Although no strong possibilities were found in this study, the current warming sea surface temperature and a negative phase PDO index were suggested for the recent declining primary production. For a better understanding of subsequent effects on marine ecosystems, more intensive interdisciplinary field studies will be required in the Ulleung Basin.
해양환경 기반 한국 연근해 어장 민감도 평가 기술 개발
주희태 ( Huitae Joo ),유만호 ( Manho Yoo ),윤상철 ( Sang Chol Yun ),김창신 ( Chang Sin Kim ),이민욱 ( Min Uk Lee ),김상일 ( Sangil Kim ),박경우 ( Kyoung Woo Park ),황재동 ( Jae-dong Hwang ),오현주 ( Hyun Joo Oh ),윤석현 ( Seok-hyu 한국수산과학회 2021 한국수산과학회지 Vol.54 No.4
Although scientist have been reporting recently that changes in ocean environment influence the species composition, movements, and growth of fish in Korea waters. Previous studies on fish vulnerability owing to climate changes are insufficient to explain the effect of fluctuating ocean environments on fisheries ground. In this study, we suggested a method for the assessment of fisheries sensitivity to various factors in ocean environments in Korean waters. To evaluate the fisheries sensitivity, catch data (Chub mackerel, Hairtail, Common squid, small yellow croaker) from National federation of fisheries cooperatives in Korea (1991-2017) and oceanographic data from Korea Ocean Data Center (KODC; 1960-2017) were normalized using the z-score method. Thereafter, the fisheries sensitivity was calculated using the difference between the catch data and the oceanographic data. Finally, the fisheries sensitivity was evaluated based on evaluation grade ratings. Result revealed that in the south sea, variability in catch data was obviously higher than environmental fluctuation (evaluation grade 1), indicating that catch variability in response to environmental change is most sensitive in the south sea among Korean waters in 2017. These results would be helpful for fishery management and policy for sustainable yield in Korean waters.
Changes in Cecal Microbiota and Short-chain Fatty Acid During Lifespan of the Rat
( Soo In Choi ),( Joo Hee Son ),( Nayoung Kim ),( Yong Sung Kim ),( Ryoung Hee Nam ),( Ji Hyun Park ),( Chin-hee Song ),( Jeong Eun Yu ),( Dong Ho Lee ),( Kichul Yoon ),( Huitae Min ),( Yeon-ran Kim ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.1
Background/Aims The gut microbiota regulates intestinal immune homeostasis through host-microbiota interactions. Multiple factors affect the gut microbiota, including age, sex, diet, and use of drugs. In addition, information on gut microbiota differs depending on the samples. The aim of this study is to investigate whether changes in cecal microbiota depend on aging. Methods Gut microbiota in cecal contents of 6-, 31-, and 74-week-old and 2-year-old male Fischer-344 rats (corresponding to 5-, 30-, 60-, and 80-year-old humans in terms of age) were analyzed using 16S ribosomal RNA metagenome sequencing and phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt) based on the Kyoto Encyclopedia of Genes and Genomes orthology. Moreover, short-chain fatty acid (SCFA) level in cecum and inflammation related factors were measured using real-time quantitative polymerase chain reaction and enzyme linked immunosorbent assay. Results Alpha and beta diversity did not change significantly with age. At the family level, Lachnospiraceae and Ruminococcaceae, which produce SCFAs, showed significant change in 31-week-old rats: Lachnospiraceae significantly increased at 31 weeks of age, compared to other age groups, while Ruminococcaceae decreased. Butyrate levels in cecum were significantly increased in 31-week-old rats, and the expression of inflammation related genes was increased followed aging. Especially, EU622775_s and EU622773_s, which were highly abundance species in 31-week-old rats, showed significant relationship with butyrate concentration. Enzymes required for producing butyrate―acetyl-CoA transferase, butyryl-CoA dehydrogenase, and butyrate kinase―were not predicted by PICRUSt. Conclusions Major bacterial taxa in the cecal lumen, such as Lachnospiraceae, well-known SCFAs-producing family, changed in 31-week-old rats. Moreover, unknown species EU622775_s and EU622773_s showed strong association with cecal butyrate level at 31 weeks of age. (J Neurogastroenterol Motil 2021;27:134-146)
Biogeochemical properties of sinking particles in the southwestern part of the East Sea (Japan Sea)
Kim, Minkyoung,Hwang, Jeomshik,Rho, TaeKeun,Lee, Tongsup,Kang, Dong-Jin,Chang, Kyung-Il,Noh, Suyun,Joo, HuiTae,Kwak, Jung Hyun,Kang, Chang-Keun,Kim, Kyung-Ryul Elsevier 2017 Journal of marine systems Vol.167 No.-
<P><B>Abstract</B></P> <P>This study investigates the biological pump system in the East Sea (Japan Sea) by conducting an analysis of the total particle flux, biogenic material composition, and carbon isotope ratios of sinking particles. The samples were collected for one year starting from March 2011 using time-series sediment traps deployed at depths of 1040m and 2280m on bottom-tethered mooring at Station EC1 (37.33°N, 131.45°E; 2300m water depth) in the Ulleung Basin (UB), southwestern part of the East Sea. The temporal variation in the particulate organic carbon (POC) flux at 1000m shows a good relationship with the primary production in the corresponding surface water. The ratio of POC flux at 1000m to satellite-based primary production in the corresponding region in the UB was ~3%, which is comparable to the values of 2 to 5% estimated from previous studies of other part of the East Sea. The lithogenic material accounted for >17% of the sinking particles at 1000m and for a larger fraction of 40 to 60% at 2280m. The radiocarbon contents of the sinking POC at both trap depths imply the additional supply of aged POC, with a much greater contribution at 2280m. Overall, the particle flux in the deep interior of the East Sea appears to be controlled by the supply of complex sources, including aeolian input, the lateral supply of resuspended sediments, and biological production in the surface water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> POC flux variation at 1000m shows a good relationship with the primary production. </LI> <LI> The ratio of POC flux at 1000m to primary production was ~3% in the UB. </LI> <LI> The particle flux in the East Sea appears to be controlled by complex sources. </LI> </UL> </P>