Article
Ecology
Kai Jiang, Xin Tong, Yan-Qian Ding, Zheng-Wei Wang, Li-Yuan Miao, Yue-E Xiao, Wei-Chang Huang, Yong-Hong Hu, Xiao-Yong Chen
Summary: This study focused on the population history of Machilus thunbergii in the East China Sea using ecological niche modeling and molecular markers. Results indicated potentially suitable habitats for M. thunbergii during the Last Glacial Maximum, with divergent lineages forming an admixture in China and Japan. The alternating population isolation and connection across the ECS did not promote diversification, suggesting the ECS may function more like a species vacuum.
JOURNAL OF BIOGEOGRAPHY
(2021)
Article
Paleontology
Angelina Ivkic, Andreas Kroh, Abbas Mansour, Mohamed Osman, Mohamed Hassan, Martin Zuschin
Summary: This study examines the abundances of Millepora in Pleistocene reefs in Egypt and finds it to be comparable to adjacent modern reefs. Comparisons between sites with and without Millepora suggest that site specific environmental characteristics determine the presence of Millepora in the fossil reef. The research concludes that the lack of preservation of habitats preferred by Millepora, rather than the preservation potential of the hydrozoan itself, is the most plausible reason for the mismatch between modern and fossil abundances.
Article
Chemistry, Organic
Li-Li Sun, Wang-Sheng Li, Jie Li, Hai-Yan Zhang, Li-Gong Yao, Hui Luo, Yue-Wei Guo, Xu-Wen Li
Summary: Chemical investigation of the South China Sea soft coral Sinularia humilis has led to the discovery of a variety of new diterpenoids, including a unique compound humilisin A, which showed anti-inflammatory activity in BV-2 microglia cells. The structures and configurations of the compounds were determined through spectroscopic analysis, chemical reactions, and quantum chemical calculations.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Environmental Sciences
Shou-En Tsao, Po-Yen Shen, Chun-Mao Tseng
Summary: This study investigated a nine-year time series data from 2010-2018 near the East China Sea, showing significantly greater trends of surface seawater pCO2 and pH compared to other oceanic time series. Mechanistic analysis revealed that seawater warming caused rapid increases in pCO2 and acidification, leading to a decline in CO2 uptake through air-sea exchange. The results suggest that rapidly warming boundary currents could result in an elevated pCO2 trend and a gradual reduction in oceanic CO2 uptake.
MARINE POLLUTION BULLETIN
(2023)
Article
Geography, Physical
Meixia Zhao, Yu Zhong, Shuqi Zhang, Haiyang Zhang, Hongqiang Yang, Qi Shi, Hongqiang Yan, Haoya Tong, Weihai Xu, Wen Yan
Summary: This study analyzed the NK-1 core from Meiji Reef in the South China Sea, revealing the development model of Holocene coral reefs and the impact of coral community diversity on reef growth. Acropora corals were identified as the main reef builders during the Holocene, with their growth rate and dispersion method playing a crucial role in the vertical accumulation of reefs.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Marine & Freshwater Biology
Jue Li, Lulu Qiao, Yi Zhong, Wenjing Xue, Hongda Yang
Summary: This study confirmed the existence of cross-shelf transport off northern Taiwan through remote sensing data and heat flux data, which can be categorized into cold eddy and cold water tongue patterns. Topographic changes and the presence of a thermal front are important factors in inducing cross-shelf transport. Strong winds and typhoons can also enhance cross-shelf transport.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Environmental Sciences
Jing Zhang, Xinyu Guo, Liang Zhao
Summary: Using a physical-biological coupled model, researchers quantified the nitrogen budgets of riverine dissolved inorganic nitrogen (DIN) and particulate organic nitrogen (PON) in the East China Sea (ECS). The Changjiang River plays a dominant role in nitrogen input, with the horizontal distributions of Changjiang DIN and PON being influenced by coastal currents and vertical stratification. Overall, less than half of DIN is converted to PON, with most leaving the ECS through lateral transport pathways, especially through the Tsushima Strait.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Marine
Igor Brovchenko, Kyeong Ok Kim, Vladimir Maderich, Kyung Tae Jung, Roman Bezhenar, Joo Hyung Ryu, Jee Eun Min
Summary: This paper focuses on the dispersion processes of Cs-137 in the BYECS region, characterized by high turbidity and multi-scale circulations. By developing a radionuclide dispersion model and using a multi-fraction sediment transport model, the study reveals the significant influence of erosion processes on the distribution of Cs-137 in shallow areas.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Hu Su, Yinger Deng, Weihua Nai, Rui Zhang, Jihan Huang, Pengjie Li, Hongkun Yang, Lin Chen, Ning Wang
Summary: This study thoroughly investigates the evolution of groundwater circulation in the Aksu River Basin, providing insights into the formation mechanism and evolutionary pattern of the groundwater flow systems. The study reveals the complex coupling relationship between the palaeosedimentary environment, palaeoclimate, and basin GFS, influenced by neotectonic movement and climate fluctuation.
Article
Geography, Physical
Shichen Tao, Kefu Yu, Hongqiang Yan, Huiling Zhang, Luo Wang, Patrick Rioual, Qi Shi, Zhongzhou Huang, Tegu Chen
Summary: This study found that sea-level in the South China Sea experienced a slight decrease from 1850 to 1900, and has been continuously rising since 1900. The study also revealed the indirect influence of ENSO and human activities on sea-level, rainfall, and salinity in the South China Sea.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Environmental Sciences
Juntian Chen, Xiao-Hua Zhu, Hua Zheng, Min Wang
Summary: Submesoscale processes in the ocean were investigated using numerical simulations in the East China Sea. It was found that the western boundary jet served as an important energy reservoir, and submesoscale footprints were observed in the continental slope and lee area of the Tokara Strait.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Marine & Freshwater Biology
Lin Qi, Peng Cheng, Menghua Wang, Chuanmin Hu, Yuyuan Xie, Keyu Mao
Summary: Using remote sensing images and numerical experiments, this study identifies two possible origins of floating S. horneri in the East China Sea and reveals their movement in space and time. The findings are important for implementing mitigation strategies and understanding possible ecological impacts along the drifting pathways of this seaweed.
Article
Environmental Sciences
Igor M. Belkin, Shang-Shang Lou, Wen-Bin Yin
Summary: High-resolution and high-frequency SST data from the Himawari-8 satellite were used to study the variability of the China Coastal Front in the East China Sea. The data was processed to generate monthly maps of the SST gradient and frontal frequency. The study found that the CCF appears in November, fully develops in December, and peaks in strength in January-February.
Article
Environmental Sciences
Wenxiang Ding, Caiyun Zhang, Shaoping Shang
Summary: Predicting the risk of harmful algal blooms (HABs) in the East China Sea is important for mitigating the damage caused. By using historical data and satellite-derived sea surface temperatures (SSTs), a simple method based on SST or SST change rate was proposed to assess HAB risk. The method can predict the risk 1-2 months in advance, aiding in the reduction of damage.
MARINE POLLUTION BULLETIN
(2022)
Article
Meteorology & Atmospheric Sciences
Gaowen Dai, Zhongshi Zhang, Odd Helge Ottera, Petra M. Langebroek, Qing Yan, Ran Zhang
Summary: The study suggests the presence of a potential tripole precipitation pattern in monsoonal China over the past 425 ka, with more precipitation in North and South China during strong East Asian summer monsoon periods, and less precipitation in Central-East China. This aligns with the understanding of modern East Asian climate, highlighting the influence of monsoonal intensity and subtropical high pressure response on precipitation patterns in monsoonal China.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Environmental Sciences
Yuki Ota, Atsushi Suzuki, Kyoko Yamaoka, Masayuki Nagao, Yuichiro Tanaka, Toshiaki Irizuki, Osamu Fujiwara, Kaoru Yoshioka, Shungo Kawagata, Shigenori Kawano, Osamu Nishimura
Summary: The study on heavy metal pollution in Matsushima Bay, Japan, revealed that the accumulation of heavy metals in marine sediments was influenced by multiple factors such as mega-tsunami, anthropogenic activities, and redox conditions. Different levels of enrichment of various heavy metals were found in sediments at different years and locations, highlighting the complexity of heavy metal contamination in coastal areas.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Paleontology
Shunichi Kinoshita, Azumi Kuroyanagi, Hodaka Kawahata, Kazuhiko Fujita, Toyoho Ishimura, Atsushi Suzuki, Osamu Sasaki, Hiroshi Nishi
Summary: Research suggests that ocean warming may negatively impact large benthic foraminifers (LBFs), leading to a decline in their shell growth. Cultivation experiments with the porcelaneous LBF Sorites orbiculus under different temperature conditions showed that shell weight and volume were optimal at around 25 degrees Celsius, with decreases observed at lower or higher temperatures.
MARINE MICROPALEONTOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Toshihiro Yoshimura, Shigeyuki Wakaki, Hodaka Kawahata, H. M. Zakir Hossain, Takuya Manaka, Atsushi Suzuki, Tsuyoshi Ishikawa, Naohiko Ohkouchi
Summary: The study investigated the variations of Sr isotopic composition in samples from rivers and sediments in the Ganges-Brahmaputra-Meghna drainage basin in Bangladesh. The differences in delta Sr-88 values among rivers and sediments were found to be influenced by weathering products and geological factors. Groundwater showed greater variations, with deeper groundwater displaying more complete interactions with sediments.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Multidisciplinary Sciences
Mariko Iijima, Jun Yasumoto, Akira Iguchi, Kiyomi Koiso, Sayaka Ushigome, Natsuki Nakajima, Yuko Kunieda, Takashi Nakamura, Kazuhiko Sakai, Mina Yasumoto-Hirose, Kanami Mori-Yasumoto, Nanami Mizusawa, Haruna Amano, Atsushi Suzuki, Mitsuru Jimbo, Shugo Watabe, Ko Yasumoto
Summary: This study demonstrates the significant role of calcareous sediments in coral reefs in mediating the impact of terrestrial runoff on corals by storing and releasing phosphate. High phosphate concentrations in seawater inhibit the skeletal formation of coral juveniles.
ROYAL SOCIETY OPEN SCIENCE
(2021)
Article
Geochemistry & Geophysics
Wenshuai Li, Xiao-Ming Liu, Kun Wang, Yongfeng Hu, Atsushi Suzuki, Toshihiro Yoshimura
Summary: Potassium participates in coral biological activities and its isotope fractionation is important for interpreting coral records. This study evaluates the distribution and variation of potassium isotopes in the skeleton of corals and identifies the influence of biotic and abiotic controls on potassium partitioning and isotope fractionation. The findings highlight the role of physiological modulation in the phase distribution of potassium in coral skeletons and its isotopic variation.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
Yoshikazu Ohno, Akira Iguchi, Mariko Ijima, Ko Yasumoto, Atsushi Suzuki
Summary: An explosive volcanic eruption in the Ogasawara Islands caused a significant amount of floating pumice to reach the coast of Okinawa Island approximately two months later. This has resulted in early evidence of ecosystem changes in coastal beaches, estuaries, mangrove forests, and coral reefs. The impact of this massive pumice drift is not only disrupting fishing activities and ship traffic but also potentially leading to short and long-term changes in coastal ecosystems. The observed phenomena on Okinawa Island may serve as a preview of the impacts on other islands where pumice has subsequently washed ashore.
SCIENTIFIC REPORTS
(2022)
Article
Instruments & Instrumentation
Yuning Zeng, Yusuke Yokoyama, Shoko Hirabayashi, Yosuke Miyairi, Atsushi Suzuki, Takahiro Aze, Yuta Kawakubo
Summary: A new method combining coral growth band counting and Sr/Ca measurement using ICP-AES was proposed to establish a high-resolution age model. The study demonstrated the feasibility of using Sr/Ca for age modeling in coral and the ability of ICP-AES to provide higher-resolution data.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2022)
Article
Paleontology
Shunichi Kinoshita, Azumi Kuroyanagi, Hodaka Kawahata, Kazuhiko Fujita, Toyoho Ishimura, Atsushi Suzuki, Harumasa Kano, Yoshimi Kubota, Hiroshi Nishi
Summary: Recent increases in CO2 concentrations emitted by human activities have resulted in ocean warming and acidification, causing significant environmental changes. This has led to distressing consequences such as bleaching and death of symbiotic calcifying organisms in coral reef regions. Among these organisms, large benthic foraminifers (LBF) have gained attention due to the impact of thermal stress on their growth and ecological functions. However, the influence of indicators such as shell volume, density, and size on the calcification rate is unclear due to the complex nature of their shell structure. This study used Micro X-ray computed tomography (MicroCT) to investigate these parameters in the hyaline LBF Calcarina gaudichaudii, revealing insights into their response to temperature stress and shell density maintenance.
MARINE MICROPALEONTOLOGY
(2023)
Article
Zoology
Hiroki Kise, Miyuki Nishijima, Akira Iguchi, Junpei Minatoya, Hiroyuki Yokooka, Yuji Ise, Atsushi Suzuki
Summary: A new genus and species of Hexactinellida-associated zoantharian, Parachurabana shinseimaruae Kise, gen. nov. et sp. nov., has been discovered in Japanese waters. It is characterized by its host hexactinellid sponge, flat polyps, unique muscle structure, and distinct genetic variations. This species is the third genus in the Parazoanthidae family associated with Hexasterophora sponges. Though currently found only in Japanese waters, similar unidentified zoantharians have been reported in Australian waters, suggesting a potentially widespread distribution across the Pacific.
Article
Environmental Sciences
Naoki Saito, Travis W. Washburn, Shinichiro Yano, Atsushi Suzuki
Summary: Using object detection with deep learning, we successfully constructed a model to detect suspended particle variations in the deep sea. This model accurately detected particles in images and measured changes in suspended particle concentrations. This method provides a new option for studying deep-sea environmental changes, with the advantages of being cost-effective, quick, and intuitive.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Hiroki Kise, Akira Iguchi, Naoki Saito, Yuki Yoshioka, Koji Uda, Tomohiko Suzuki, Atsushi J. Nagano, Atsushi Suzuki, Nozomu Iwasaki
Summary: The genetic population structure of Corallium japonicum in the Northwest Pacific was examined using RAD-seq. Gene flow was found to be widespread, but larval dispersal simulations revealed limited gene flow between certain populations. The findings of this study provide valuable information for the effective management of C. japonicum.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Masatoshi Yamada, Atsushi Suzuki, Nozomu Iwasaki
Summary: Lead-210 concentrations were used to estimate the skeletal growth rates of four species of precious corals and a bamboo coral. The radial and linear growth rates of the colonies were measured, providing valuable information for population studies of these coral species.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Ai Genda, Minoru Ikehara, Atsushi Suzuki, Wahyoe S. Hantoro, Mayuri Inoue
Summary: The Indonesian Throughflow (ITF) is important for heat flux and water budget between the Pacific and Indian oceans, affecting Asian monsoon and climate change. Observations are inadequate, so coral analysis was conducted to reconstruct sea-surface temperature (SST) and salinity (SSS). Abrupt warming and saline conditions were observed in the mid-1950s, with changed relationships between SST and climate variability in Pacific and Indian oceans.
GEOCHEMICAL JOURNAL
(2022)
Article
Environmental Sciences
Hiroto Kajita, Ayumi Maeda, Masayuki Utsunomiya, Toshihiro Yoshimura, Naohiko Ohkouchi, Atsushi Suzuki, Hodaka Kawahata
Summary: Using long-chain alkenones and n-alkanes to reconstruct past environments is common, but applying this technique to exposed sedimentary rock sequences can be challenging due to potential alterations. A study in Japan's Kazusa Group found that the biomarkers preserved there could provide a detailed record of Pleistocene paleoenvironments, specifically reflecting changes in sea surface temperature and terrestrial climate. This suggests that the biomarker measurements in the Kazusa Group could help reconstruct ocean and atmospheric changes throughout the Pleistocene.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Fisheries
Yutaka Okumura, Hiromi Matsuoka, Hisayuki Arakawa, Fuyuki Tokanai, Atsushi Suzuki, Toshiaki Irizuki, Hiroto Kajita, Motoyuki Hara
Summary: Two sediment cores were collected from Nagatsura-Ura Lagoon, which was affected by the 2011 Tohoku-oki tsunami. Traces of the 2011 tsunami and earlier tsunamis were found in both the central and inner parts of the lagoon. The microbial composition in the lagoon showed little change due to limited seawater exchange through the closed lagoon mouth.