Regime shift of skeletal δ 13 C after 1997/1998 El Nino event in Porites coral from Green Island, Taiwan.

Autor: Ikeda M; Institute for the Advancement of Higher Education, Hokkaido University, Sapporo, Japan. ike@high.hokudai.ac.jp., Yamazaki A; KIKAI Institute for Coral Reef Sciences, Kikai Town, Japan.; Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan., Ohmori K; Hokkaido Research Organization (Environmental and Geological Research Department, Geological Survey of Hokkaido), Sapporo, Japan., Chiang HW; High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, Taiwan ROC., Shen CC; High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, Taipei, Taiwan ROC.; Research Center for Future Earth, National Taiwan University, Taipei, Taiwan., Watanabe T; KIKAI Institute for Coral Reef Sciences, Kikai Town, Japan.; Department of Natural History Sciences, Faculty of Science, Hokkaido University, Sapporo, Japan.; Research Institute for Humanity and Nature, Kyoto, Japan.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Oct 07; Vol. 14 (1), pp. 23332. Date of Electronic Publication: 2024 Oct 07.
DOI: 10.1038/s41598-024-74219-5
Abstrakt: The 1997/1998 El Niño event caused mass coral bleaching and mortality in many tropical and subtropical regions, including corals on Green Island, Taiwan, in the northwestern Pacific Ocean. This study analyzed coral carbon isotope ratios (δ 13 C), oxygen isotope ratios (δ 18 O), and Sr/Ca ratios for 29 years, including the 1997/1998 El Niño period, to examine how high water temperature events are recorded in coral geochemical indicators. Sr/Ca ratios in coral skeletons from Green Island show the lowest peak, means the highest temperature during the 1997/1998 El Niño period. However, we couldn't observe high-temperature events on δ 18 O. Furthermore, a negative δ 13 C shift was observed after El Niño events. The regime shift of δ 13 C might have been caused by temporal bleaching and/or a decrease in symbiotic algae due to high water temperature stress under the continuous decrease in δ 13 C in DIC due to the Suess effect.
(© 2024. The Author(s).)
Databáze: MEDLINE
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