Article
Microbiology
Yayu Wang, Shuilin Liao, Yingbao Gai, Guilin Liu, Tao Jin, Huan Liu, Lone Gram, Mikael Lenz Strube, Guangyi Fan, Sunil Kumar Sahu, Shanshan Liu, Shuheng Gan, Zhangxian Xie, Lingfen Kong, Pengfan Zhang, Xin Liu, Da-Zhi Wang
Summary: The microbial community in the Indian Ocean exhibits high functional redundancy and gene diversity in nitrogen acquisition, regulated by environmental factors such as temperature, phosphate, silicate, and pH. The cyanobacterial genus Prochlorococcus is abundant in the surface waters of the Indian Ocean, representing an important microbial group in this region. In the metagenomic analysis, genes related to nitrogen metabolism in the Prochlorococcus population were more abundant than those involved in inorganic N assimilation.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Oceanography
Chao Yuan, Xuelei Zhang, Zongling Wang, Yan Li, Zongjun Xu, Qinsheng Wei, Lin Liu
Summary: A flow cytometric analysis of picoplankton was conducted along a meridional transect in the eastern equatorial Indian Ocean during the boreal fall intermonsoon period. Heterotrophic bacteria accounted for over 80% of the total picoplankton abundance. Physical processes controlled the distribution patterns of picoplankton, with Pro being the dominant picophytoplankton species.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Oceanography
Michael R. Landry, Raleigh R. Hood, Claire H. Davies, Karen E. Selph, David Antoine, Mika C. Carl, Lynnath E. Beckley
Summary: This study investigated the plankton biomass structure, production, and grazing rates in the eastern Indian Ocean. The results showed that production and grazing rates increased significantly from south to north, with Prochlorococcus dominating productivity and microzooplankton accounting for most of the grazing. These findings are important for understanding the importance and changes in the marine ecosystem of the eastern Indian Ocean.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Oceanography
Siyu Jiang, Fuminori Hashihama, Hongbin Liu, Kazutoshi Yoshitake, Hideto Takami, Koji Hamasaki, Idha Yulia Ikhsani, Hajime Obata, Hiroaki Saito
Summary: This study investigated the adaptation of Prochlorococcus to nutrient environments in the surface eastern Indian Ocean. The results showed distinct physiological patterns and abundance of functional gene modules related to nutrient utilization, indicating their adaptation to local nutrient environments.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Geochemistry & Geophysics
Yuta Isaji, C. Yoshikawa, N. O. Ogawa, K. Matsumoto, A. Makabe, S. Toyoda, N. F. Ishikawa, H. Ogawa, H. Saito, M. C. Honda, N. Ohkouchi
Summary: In this study, nitrogen isotopic analysis of chlorophylls in the eastern Indian Ocean revealed differences in nitrogen source assimilation by phytoplankton species, with specific chlorophylls providing insights into isotopic variability within the community. The results highlighted subtle variations in nitrate availability at the subsurface chlorophyll maximum along a meridional transect.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Microbiology
Hoon Je Seong, Simon Roux, Chung Yeon Hwang, Woo Jun Sul
Summary: The distribution patterns of microbial epigenetic marks in the ocean microbiome were analyzed through genome-centric metagenomics, revealing that DNA methylation patterns are associated with ecological changes and virus-host dynamics in the ocean microbiome.
Article
Environmental Sciences
Yuqiu Wei, Ting Gu, Guicheng Zhang, Keming Qu, Zhengguo Cui, Jun Sun
Summary: This study uses a large dataset from the Yellow Sea, Indian Ocean, and Pacific Ocean to investigate the variability of abundance and distribution of marine picophytoplankton among different regions. The results suggest that water temperature and dissolved inorganic nitrogen are key factors driving the large-scale variability of marine picophytoplankton.
ENVIRONMENTAL RESEARCH
(2022)
Article
Ecology
Yuqiu Wei, Xingzhou Wang, Jiang Gui, Jun Sun
Summary: This study conducted the first measurements of size-fractionated biogenic silica standing stocks and production rates in the oligotrophic Eastern Indian Ocean, revealing that smaller plankton, especially pico- and nanoplankton, contribute significantly to both the total biogenic silica standing stock and its production rate. The data suggests a possible biological control over the size-fractionated biogenic silica standing stocks, with picoeukaryotes showing a clear correlation with <2 μm biogenic silica.
Article
Environmental Sciences
Daochen Zhu, Sivasamy Sethupathy, Lu Gao, Muhammad Zohaib Nawaz, Weimin Zhang, Jianxiong Jiang, Jianzhong Sun
Summary: In this study, microbial diversity, community composition and dynamics in microbial community structure in deep-sea sediments of the South Indian Ocean were explored using Next-Generation Sequencing. The results showed that Proteobacteria and Firmicutes were the dominant bacterial phyla, while Thaumarchaeota and Euryarchaeota were the abundant archaeal phyla. Ascomycota and Basidiomycota were the most abundant fungal phyla. It was also found that bacterial communities tended to be more dynamic than archaeal and fungal communities.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Microbiology
Wei Yan, Xuejin Feng, Ta-Hui Lin, Xingyu Huang, Le Xie, Shuzhen Wei, Kun Zhou, Yi-Lung Chen, Weicheng Luo, Wenqian Xu, Wei Zhang, Muhammad Zohaib Nawaz, Ya-Wei Luo, Qinglu Zeng, Rui Zhang, Nianzhi Jiao
Summary: Prochlorococcus is the most abundant oxygenic photosynthetic microorganism, with high-light-adapted clade II (HLII) being the dominant ecotype. However, the factors driving the dominance of HLII in oligotrophic oceans are still unknown. In this study, we identified three distinct groups of HLII subclades (surface group, transition group, and deep group) and demonstrated that their differentiation corresponds to genomic and ecological characteristics. Our findings suggest that the distribution of Prochlorococcus HLII in the marine environment is associated with the differentiation of diverse subclades and provide insights into the future shifts in Prochlorococcus community under climate change.
Article
Biodiversity Conservation
Yuping Zhou, Xue Yang, Ying Wang, Fangfang Li, Jiangtao Wang, Liju Tan
Summary: The external nutrient inputs from atmospheric deposition and hydrodynamic processes not only promoted chlorophyll a biomass increase and generated a shift in phytoplankton community structure, but also reduced biodiversity in marine ecosystems. The C/N ratio in cultures with nitrogen addition was significantly lower than cultures with only phosphorous or iron addition. These results provide insights into the influence of nutrient inputs on marine biogeochemical cycles.
ECOLOGICAL INDICATORS
(2021)
Article
Environmental Sciences
Feng Wang, Shujin Guo, Junhua Liang, Xiaoxia Sun
Summary: Under the background of global warming, the area of oligotrophic tropical oceans has expanded due to increased water-column stratification. Picophytoplankton communities, especially Prochlorococcus, picoeukaryotes, and Synechococcus, play a crucial role in carbon biomass and primary production. This study investigated the distribution patterns of picophytoplankton communities in the eastern Indian Ocean and found that their abundance was strongly correlated with the degree of vertical stratification. Synechococcus preferred strongly stratified waters, while Prochlorococcus thrived in regions of weaker stratification. Understanding these distribution patterns and their relationship with stratification is essential for comprehensively understanding the oligotrophic tropical ecosystem with increasing stratification in the future.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Review
Environmental Sciences
Jingjing Chang, Johannes A. van Veen, Chunjie Tian, Eiko E. Kuramae
Summary: The rhizosphere-associated microbiome plays a crucial role in plant growth and stress tolerance. However, its utilization in domesticated crop production is currently limited. By comparing the diversity, structure, and function of rhizosphere microbial communities in wild and domesticated plants, we can assess the potential for improving sustainable production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Teddy Namirimu, Yun Jae Kim, Mi-Jeong Park, Dhongil Lim, Jung-Hyun Lee, Kae Kyoung Kwon
Summary: This study investigated the microbial communities in hydrothermal fields in the Central Indian Ridge using a metagenomic sequencing approach. The results showed that the microbial communities were similar in different sampling sites, with bacteria dominating over archaea. The microbial populations in these vent fields exhibited diverse metabolic capabilities, including aerobic respiration, carbon fixation, and sulfur and nitrogen metabolisms.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
James O'Brien, Amaranta Focardi, Elisabeth S. M. Deschaseaux, Katherina Petrou, Martin Ostrowski, Lynnath E. Beckley, Justin R. Seymour
Summary: Dimethylsulfoniopropionate (DMSP) serves as an essential dissolved organic matter for the marine food web and plays a crucial role in the global sulfur cycle. However, little is known about the abundance and biogeography of bacterial genes involved in DMSP cycling in the eastern Indian Ocean (EIO).
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2022)
Article
Microbiology
Satheeswaran Thangaraj, Haijiao Liu, Yiyan Guo, Changling Ding, Il-Nam Kim, Jun Sun
Summary: Ocean warming and acidification have interactive effects on coccolithophore physiology and result in significant biogeochemical changes. In this study, we investigated the long-term effects of different transitional periods on the physiology of the coccolithophore Chrysotila dentata under present and projected ocean conditions. Our results showed that physiological responses of HTHC cells decreased with long-exposure, but the overall physiology of HTHC cells continued to improve with each generation. This suggests that coccolithophore resilience increases over generations under ocean warming and acidifying conditions.
ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Yunxue Li, Sitong Liu, Zhiyong Ji, Jun Sun, Xianhua Liu
Summary: This study systematically investigated the sorption behavior of two typical microplastics (PVC and PE) to Zn(II) and their combined toxic effects on Chlorella vulgaris. The results showed that different microplastics exhibited different adsorption capacities for Zn(II) and the combined exposure to Zn(II) and microplastics had distinct effects on cell growth and oxidative stress.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Yuqiu Wei, Dongsheng Ding, Ting Gu, Yong Xu, Xuemei Sun, Keming Qu, Jun Sun, Zhengguo Cui
Summary: Data on the independent or combined effects of ocean acidification and warming on coastal eutrophication and organic pollution are limited. Acidification favors eutrophication and organic pollution, while warming inhibits these two variables. However, the interaction between acidification and warming in the future may exacerbate organic pollution but mitigate eutrophication.
MARINE POLLUTION BULLETIN
(2023)
Article
Biology
Satheeswaran Thangaraj, Jun Sun
Summary: Physiological experiments on Heterosigma akashiwo provide insights into the metabolic changes of algal blooms under future warming and acidification of the ocean. Despite the expected increase in harmful algal species due to ocean warming and acidification, the population of Heterosigma akashiwo has decreased. However, the physical and metabolic modifications of this species in terms of C:N:P ratio and macromolecule accumulation are still unknown.
COMMUNICATIONS BIOLOGY
(2023)
Article
Oceanography
Congcong Guo, Guicheng Zhang, Shan Jian, Wei Ma, Jun Sun
Summary: The quantification of transparent exopolymer particles (TEP) by colorimetric method is prone to large errors and low repeatability, mainly due to undefined and unassessed steps in the original method. It is uncertain whether the 80% sulfuric acid solution used as the extraction solution for TEP determination is prepared based on volume ratio or mass ratio. In addition, changes in the solubility of Gum Xanthan (GX) from the market rendered the original protocol ineffective, and the grinding of GX stock solution was replaced with shaking using a rotating shaker to prevent excessive dissolution. Different preparation techniques resulted in varied concentrations of 80% H2SO4. The shaking duration during the preparation of standard solution significantly affected the calibration curve slope, leading to different correction results for TEP.
ACTA OCEANOLOGICA SINICA
(2023)
Article
Environmental Sciences
Xudong Cui, Liying Peng, Yu Guo, Guicheng Zhang, Haijiao Liu, Yujian Wen, Guodong Zhang, Jun Sun
Summary: This paper investigates the distribution, sources, and deposition fluxes of aerosol nutrients in the Bohai Bay and their impacts on the marine ecosystem. The results show that the concentrations of typical aerosol nutrients are generally higher in autumn than in summer, with high values mainly occurring in the central region. The potential sources of pollution are mainly concentrated in Shandong and Mongolia, and include agriculture, dust, and industry.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Zhuo Chen, Ting Gu, Jun Sun
Summary: This study investigated the distribution and changes of pico-phytoplankton in the Eastern Indian Ocean and estimated their carbon biomass contributions. Prochlorococcus, Synechococcus, and picoeukaryotes were the major picophytoplankton taxa. Their abundance varied with depth, with Synechococcus in the surface layer and Prochlorococcus and picoeukaryotes in the subsurface layer. Environmental factors such as fluorescence, temperature, dissolved oxygen concentration, and nutrients played important roles in shaping the picophytoplankton communities in this region.
ENVIRONMENTAL RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Yingjie Mao, Jun Sun, Congcong Guo, Shuang Yang, Yuqiu Wei
Summary: The direct sinking behavior of phytoplankton is crucial for the ocean carbon cycle. After comparing different methods, the SETCOL method was chosen for studying cell sinking behavior. The study analyzed samples from the South China Sea and found that the Kuroshio Current increased sinking rates while Tropical Storms slowed them down.
JOURNAL OF MARINE SYSTEMS
(2023)
Article
Environmental Sciences
Xianfeng Li, Wenzhe Xu, Shuai Song, Jun Sun
Summary: Water quality monitoring stations are essential for detecting excess pollutants in river sections, but identifying the causes of these exceedances can be challenging, especially in heavily polluted rivers with multiple contamination sources. In this study, we used the SWAT model to simulate pollution loads from different sources in the Haihe River Basin and analyzed the spatiotemporal distribution of pollutants. The results highlight the need for targeted prevention and control policies based on the primary sources of pollution loads in different regions.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Xinze Shuwang, Guodong Zhang, Danyang Li, Yujian Wen, Guicheng Zhang, Jun Sun
Summary: This study investigated the effects of human activity-induced environmental heterogeneity on the chromophytic phytoplankton in Bohai Bay. The results showed that human disturbance had a greater impact on the phytoplankton communities than natural factors. The assembly of the communities was influenced by both stochastic and deterministic processes, with different importance rankings in nearshore and offshore areas. Dissolved inorganic nitrogen, eutrophication index, and chemical oxygen demand were the main environmental factors affecting the phylogenetic turnover of the phytoplankton.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yang Liu, Xiaofang Liu, Yi Long, Yujian Wen, Chao Ma, Jun Sun
Summary: This study investigates the molecular composition and component characteristics of marine dissolved organic matter (DOM) in the eastern Indian Ocean. It reveals the presence of thousands of individual DOM formulas, including recalcitrant compounds and stable components. The study also uncovers a shift in the composition of DOM with depth, indicating the aging of the water column.
Article
Environmental Sciences
Haijiao Liu, Changling Ding, Guicheng Zhang, Yiyan Guo, Yuyao Song, Satheeswaran Thangaraj, Xiaodong Zhang, Jun Sun
Summary: This study evaluated the distribution and pollution status of toxic heavy metals in seawater and sediment of the Bohai Bay coastal system. The results showed a decline in metal pollution due to recent pollution control measures. The seawater posed a moderate to high level of ecological risk, and the hydrochemical factors had different impacts on dissolved and suspended metals.
MARINE ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Marine
Lixing Wang, Yunpeng Zhang, M. Hesham El Naggar, Hao Liu, Xin Liu, Wenbing Wu, Jun Sun
Summary: This paper presents a novel CSW model to simulate the interaction between piles and cohesionless soil under lateral cyclic loads, which enhances the depiction of resistance and failure pattern of the soil. The validated model accurately predicts the response characteristics of piles under different loading conditions.
Article
Environmental Sciences
Yiyan Guo, Chao Wu, Zhi Wang, Yifeng Shi, Jun Sun
Summary: This study provides preliminary insights into the distribution patterns of bacterial communities and metal resistance genes in the coastal sediments of Bohai Bay, laying the groundwork for understanding microbial community adaptations and supporting ecological restoration efforts in multi-metal polluted environments.
ENVIRONMENTAL POLLUTION
(2023)
Article
Geosciences, Multidisciplinary
Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona Sheila R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon-Tilia, Ilana Berman-Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo-Castillo, Amalia Maria Sacilotto Detoni, Scott C. Doney, Cecile Dupouy, Marta Estrada, Camila Fernandez, Bieito Fernandez-Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesus Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Horstmann, Amal Jayakumar, Zhibing Jiang, Shuh-Ji Kao, David M. Karl, Leila R. Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Loscher, Emilio Maranon, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert Moore, Beatriz Mourino-Carballido, Margaret R. Mulholland, Shin-ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramirez-Cardenas, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie C. Robidart, Vedula V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean-Eric Tremblay, Kendra Turk-Kubo, Zuozhu Wen, Angelicque E. White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, Ya-Wei Luo
Summary: This study presents an updated version (version 2) of the global oceanic diazotroph database, which significantly increases the number of in situ diazotrophic measurements and provides more detailed insights into nitrogen fixation in the global ocean. Version 2 yields significantly higher estimates of nitrogen fixation rates compared to version 1, particularly in the South Pacific and North Atlantic regions. Furthermore, additional data sheets for non-cyanobacterial diazotrophs and cell-specific N2 fixation rates have been included in version 2, enhancing the database's comprehensiveness.
EARTH SYSTEM SCIENCE DATA
(2023)