https://repository.kopri.re.kr/handle/201206/5527 Sun, 05 Apr 2026 23:38:43 GMT 2026-04-05T23:38:43Z https://repository.kopri.re.kr/handle/201206/7504 Title: Effects of ocean acidification driven by elevated CO2 on larval shell growth and abnormal rates of the venerid clam, Mactra veneriformis Authors: Kim, Jee-Hoon; Choy, Eun-Jung; Kim, Won; Yang, Eun Jin; Kang, Sung-Ho; Yu, Ok Hwan Abstract: The venerid clam ( Mactra veneriformis Reeve 1854) is one of the main cultured bivalve species in intertidal and shallow subtidal ecosystems along the west coast of Korea. To understand the eff ects of ocean acidifi cation on the early life stages of Korean clams, we investigated shell growth and abnormality rates and types in the D-shaped, umbonate veliger, and pediveliger stages of the venerid clam M . veneriformis during exposure to elevated seawater p CO 2 . In particular, we examined abnormal types of larval shell morphology categorized as shell deformations, shell distortions, and shell fi ssures. Specimens were incubated in seawater equilibrated with bubbled CO 2 -enriched air at (400±25)×10 -6 (ambient control), (800±25)×10 -6 (high p CO 2 ), or (1 200±28)×10 -6 (extremely high p CO 2 ), the atmospheric CO 2 concentrations predicted for the years 2014, 2084, and 2154 (70-year intervals;two human generations), respectively, in the Representative Concentration Pathway (RCP) 8.5 scenario. The mean shell lengths of larvae were signifi cantly decreased in the high and extremely high p CO 2 groups compared with the ambient control groups. Furthermore, under high and extremely high p CO 2 conditions, the cultures exhibited signifi cantly increased abundances of abnormal larvae and increased severity of abnormalities compared with the ambient control. In the umbonate veliger stage of the experimental larvae, the most common abnormalities were shell deformations, distortions, and fi ssures;on the other hand, convex hinges and mantle protuberances were absent. These results suggest that elevated CO 2 exerts an additional burden on the health of M . veneriformis larvae by impairing early development. Fri, 01 Jan 2016 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/7504 2016-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8867 Title: Impacts of ocean acidification on calcifying organisms in the Antarctic marine ecosystem, King George Island Authors: Choy, Eun-Jung Tue, 22 Dec 2015 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/8867 2015-12-22T00:00:00Z https://repository.kopri.re.kr/handle/201206/6068 Title: The significant inputs of trace elements and rare earth elements from melting glaciers in Antarctic coastal waters Authors: Kim, Intae; Kim, Guebuem; Choy, Eun-Jung Abstract: To evaluate the impact of modern glacier melting on the chemical enrichment of Antarctic coastal waters, we measured trace elements, including dissolved iron (Fe) and rare earth elements (REEs), together with dissolved inorganic nitrogen, phosphorous, silicate and dissolved organic carbon (DOC) in ice, snow and coastal seawater of Marian Cove in the northernmost part of Antarctica (62S). There was an increase in the concentrations of Fe and other trace elements (Al, Mn, Cr, Ni, Co, Pb and REEs) between the bay mouth and the glacier valleys. Good correlations between salinity and these chemical elements indicate that the trend was mainly due to the influence of glacier meltwater (GMW). When the effect ofGMWwas quantified based on plots of its presence (average 5.7%) in the surface water of the cove, the concentrations of trace elements in seawater increased 18-fold for Fe, eight- to 10-fold for Al and Mn and up to four-fold for Cr, Ni, Co, Pb and REEs by GMW. However, the contribution of GMW to inorganic nutrients and DOC was negligible. The significance of GMW-borne REE contribution in this cove was further evidenced by middle REE enrichment in cove water. Our results suggest that the currently increasing glacier melting in Antarctica has a significant influence on the level of trace elements, particularly Fe, in cove water, which in turn may have a significant impact on the biogeochemistry of coastal seawater in Antarctica. Thu, 01 Jan 2015 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/6068 2015-01-01T00:00:00Z