https://repository.kopri.re.kr/handle/201206/11900 Tue, 21 Apr 2026 05:22:41 GMT 2026-04-21T05:22:41Z https://repository.kopri.re.kr/handle/201206/16411 Title: Interspecific Variations in the Internal Mercury Isotope Dynamics of Antarctic Penguins: Implications for Biomonitoring Authors: Jung Saebom; Besnard Lucien; Li Mi-Ling; Reinfelder John; Kim Eunhee; Kwon Sae Yun; Kim, Jeong-Hoon Abstract: Mercury (Hg) biomonitoring requires a precise understanding of the internal processes contributing to disparities between the Hg sources in the environment and the Hg measured in the biota. In this study, we investigated the use of Hg stable isotopes to trace Hg accumulation in Ad & eacute;lie and emperor penguin chicks from four breeding colonies in Antarctica. Interspecific variation of Delta Hg-199 in penguin chicks reflects the distinct foraging habitats and Hg exposures in adults. Chicks at breeding sites where adult penguins predominantly consumed mesopelagic prey showed relatively lower Delta Hg-199 values than chicks that were primarily fed epipelagic krill. Substantial delta Hg-202 variations in chick tissues were observed in both species (Ad & eacute;lie: -0.11 to 1.13 parts per thousand, emperor: -0.27 to 1.15 parts per thousand), whereas only emperor penguins exhibited the lowest delta Hg-202 in the liver and the highest in the feathers. Our results indicate that tissue-specific delta Hg-202 variations and their positive correlations with % MeHg resulted from MeHg demethylation in the liver and kidneys of emperor penguin chicks, whereas Ad & eacute;lie penguin chicks showed different internal responses depending on their exposure to dietary MeHg. This study highlights the importance of considering intra- and interspecific variations in adult foraging ecology and MeHg demethylation when selecting penguin chicks for Hg biomonitoring. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16411 2024-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/14582 Title: Ecosystem Structure and Function of Marine Protected Area (MPA) in Antarcitca Authors: Kim, Jeong-Hoon Wed, 26 Jul 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/14582 2023-07-26T00:00:00Z https://repository.kopri.re.kr/handle/201206/16203 Title: Spatio-temporal variations in organic carbon composition driven by two different major phytoplankton communities in the Ross Sea, Antarctica Authors: Kim Jaehong; La, Hyoung Sul; Kim, Jeong-Hoon; Jo Naeun; Lee Junbeom; Kim, Bo Kyung; Son, Wuju; Kim Kwanwoo; Jang Hyo-Keun; Park Sanghoon; Yoo, Hyeju; Kim Jaesoon; Park, Jisoo; Ahn So Hyun; Lee Sang Heon Abstract: The compositions of organic carbon could be important in determining biological carbon pump efficiency. However, little information on them in relation to each algal assemblage is currently available in the Ross Sea. Here, we inves-tigated the seasonal variations in organic carbon composition and the relative abundance of each organic carbon, in-cluding particulate organic carbon (POC), dissolved organic carbon (DOC), and transparent exopolymer particles (TEPs), characterized by different algal groups in the Ross Sea. The average POC and DOC contributions to the total organic carbon (TOC = POC + DOC) were 13.8 & PLUSMN; 3.7 % and 86.2 & PLUSMN; 3.7 % in mid-January 2019 and 20.9 & PLUSMN; 4.1 % and 79.1 & PLUSMN; 4.1 % in February-March 2018, respectively. The carbon content of TEP (TEP-C) contributed 19.6 & PLUSMN; 11.7 % and 4.6 & PLUSMN; 7.0 % of POC and TOC in mid-January and 36.2 & PLUSMN; 14.8 % and 9.0 & PLUSMN; 6.7 % in February-March, respectively. We found that the organic carbon compositions were affected by seasonal variations in the phytoplankton bloom phase, physical characteristics, and phytoplankton community structure. DOC concentra-tions and contributions to the TOC increased as phytoplankton cells became senescent in mid-January and decreased in February-March when phytoplankton were relatively active. From February-March, the deepened mixed layer depth encouraged TEP formation, subsequently increasing the TEP contributions. Regardless of the sampling season, all organic carbon concentrations per unit Chl-a were significantly higher in P. antarctica-abundant groups. The DOC contributions to the TOC were correspondingly higher at the P. antarctica-abundant stations in mid-January, which indicates that P. antarctica could be also important in the DOC contributions in the Ross Sea. The rapid alteration in environmental characteristics and phytoplankton community structures in the Ross Sea due to climate change could affect the organic carbon pool at the euphotic layer which consequently could determine the efficiency of the biological pump. Sun, 01 Jan 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16203 2023-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/13701 Title: Genomic Survey and Microsatellite Marker Investigation of Patagonian Moray Cod (Muraenolepis orangiensis) Authors: Choi, Eunkyung; Lee, Seung Jae; Jo, Euna; Kim, Jinmu; Parker, Steven J.; Kim, Jeong-Hoon; Park, Hyun Abstract: Simple Summary Patagonian moray cod is known to inhabit the cold waters near Antarctica, and it belongs to the Muraenolepis genus. This genus has seven species, and five of them are recently reported. The Muraenolepis genus has similar morphological characters, and this is a limitation of taxonomical classification. In this study, a genome survey and microsatellite marker analysis were conducted to characterize the genome profile for classification. As a result, genomic data such as genome size and microsatellite motifs were obtained. The Muraenolepididae family of fishes, known as eel cods, inhabits continental slopes and shelves in the Southern Hemisphere. This family belongs to the Gadiformes order, which constitutes one of the most important commercial fish resources worldwide, but the classification of the fish species in this order is ambiguous because it is only based on the morphological and habitat characteristics of the fishes. Here, the genome of Patagonian moray cod was sequenced using the Illumina HiSeq platform, and screened for microsatellite motifs. The genome was predicted to be 748.97 Mb, with a heterozygosity rate of 0.768%, via K-mer analysis (K = 25). The genome assembly showed that the total size of scaffolds was 711.92 Mb and the N50 scaffold length was 1522 bp. Additionally, 4,447,517 microsatellite motifs were identified from the genome survey assembly, and the most abundant motif type was found to be AC/GT. In summary, these data may facilitate the identification of molecular markers in Patagonian moray cod, which would be a good basis for further whole-genome sequencing with long read sequencing technology and chromosome conformation capture technology, as well as population genetics. Fri, 01 Jul 2022 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/13701 2022-07-01T00:00:00Z