https://repository.kopri.re.kr/handle/201206/13427 Tue, 10 Mar 2026 09:24:33 GMT 2026-03-10T09:24:33Z https://repository.kopri.re.kr/handle/201206/16184 Title: Spatial variations of ascidian diets in a glacial retreated fjord of the West Antarctic Peninsula Authors: Kim, Dong-U; Ahn, In-Young; Gal, Jong-Ku; Ha, Sun-Yong; Khim, Jong Seong Abstract: The impacts of glacial retreat on diets of ascidians, one of the filter feeders and a major component of the benthic- pelagic energy pathway, remain unclear. We analyzed carbon and nitrogen stable isotopes of four dominant ascidian species and five potential food sources in Marian Cove, a deglaciating fjord in West Antarctica. Microphytobenthos was a major food source for ascidians regardless of proximity to the glacier, but phytoplankton contribution decreased closer to the glacier. Particularly near the glacier, microphytobenthos formed visible bushes on the surface of ascidians providing an easily accessible potential food source. The diet of Molgula pedunculata changed with spatial variations in food sources influenced by glaciers, whereas Cnemidocarpa ver rucosa, which exhibits a squirting behavior, showed a consistent diet primarily contributed by micro phytobenthos regardless of glacial impact. These results provide necessary information for understanding the impact of climate change-induced glacial retreat on the diet of ascidians, a dominant taxon in the Antarctic coast. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16184 2024-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16278 Title: Observing change in pelagic animals as sampling methods shift: the case of Antarctic krill Authors: Hill Simeon L.; Atkinson Angus; Arata Javier A.; Belcher Anna; Nash Susan Bengtson; Bernard Kim S.; Cleary Alison; Conroy John A.; Driscoll Ryan; Fielding Sophie; Flores Hauke; Forcada Jaume; Halfter Svenja; Hinke Jefferson T.; Huckstadt Luis; Johnston Nadine M.; Kane Mary; Kawaguchi So; Krafft Bjorn A.; Kruger Lucas; La, Hyoung Sul; Liszka Cecilia M.; Meyer Bettina; Murphy Eugene J.; Pakhomov Evgeny A.; Perry Frances; Pinones Andrea; Polito Michael J.; Reid Keith; Reiss Christian; Rombola Emilce; Saunders Ryan A.; Schmidt Katrin; Sylvester Zephyr T.; Takahashi Akinori; Tarling Geraint A.; Trathan Phil N.; Veytia Devi; Watters George M.; Xavier Jose C.; Yang Guang Abstract: Understanding and managing the response of marine ecosystems to human pressures including climate change requires reliable large-scale and multi-decadal information on the state of key populations. These populations include the pelagic animals that support ecosystem services including carbon export and fisheries. The use of research vessels to collect information using scientific nets and acoustics is being replaced with technologies such as autonomous moorings, gliders, and meta-genetics. Paradoxically, these newer methods sample pelagic populations at ever-smaller spatial scales, and ecological change might go undetected in the time needed to build up large-scale, long time series. These global-scale issues are epitomised by Antarctic krill (Euphausia superba), which is concentrated in rapidly warming areas, exports substantial quantities of carbon and supports an expanding fishery, but opinion is divided on how resilient their stocks are to climatic change. Based on a workshop of 137 krill experts we identify the challenges of observing climate change impacts with shifting sampling methods and suggest three tractable solutions. These are to: improve overlap and calibration of new with traditional methods; improve communication to harmonise, link and scale up the capacity of new but localised sampling programs; and expand opportunities from other research platforms and data sources, including the fishing industry. Contrasting evidence for both change and stability in krill stocks illustrates how the risks of false negative and false positive diagnoses of change are related to the temporal and spatial scale of sampling. Given the uncertainty about how krill are responding to rapid warming we recommend a shift towards a fishery management approach that prioritises monitoring of stock status and can adapt to variability and change. Mon, 01 Jan 2024 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/16278 2024-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/15162 Title: Carbon cycle change and ecosystem response under the Southern Ocean warming Authors: Park, Jisoo Sun, 01 Jan 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/15162 2023-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/14545 Title: Understanding of physical processes governing the cross-frontal heat flux in the Antarctic Circumpolar Current near Southeastern Indian Ridge Authors: Park, Jae-Hun; Park, Jisoo Wed, 26 Jul 2023 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/14545 2023-07-26T00:00:00Z