Article
Environmental Sciences
Qi Wu, Chang-Gui Pan, Ying-Hui Wang, Shao-Ke Xiao, Ke-Fu Yu
Summary: This study investigated the occurrence, bioaccumulation, and trophic magnification of 22 antibiotics in a subtropical food web from the Beibu Gulf. The research found distinct differences in antibiotic concentrations and types among marine taxa, with some chemicals showing trophic magnification through the food web. Additionally, the study highlighted the potential bioaccumulation of antibiotics in marine organisms based on their log D-ow values.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Shuai Peng, Xuehui Wang, Feiyan Du, Dianrong Sun, Yuezhong Wang, Pimao Chen, Yongsong Qiu
Summary: Beibu Gulf, a semi-enclosed bay in the northwestern South China Sea, has important ecological and economic value. The study shows that fish abundance in the area has significantly decreased due to anthropogenic disturbance, leading to changes in dominant species composition, decreased diversity, and lower trophic levels. The fishing-in-balance index also declined.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Chryssi Mytilineou, Bent Herrmann, Christopher J. Smith, Danai Mantopoulou-Palouka, Aikaterini Anastasopoulou, Apostolos Siapatis, Antonello Sala, Persefoni Megalofonou, Nadia Papadopoulou, Vassiliki Vassilopoulou, Caterina Stamouli, Stefanos Kavadas, Evgenia Lefkaditou, Artemis Nicolaidou
Summary: Fisheries have significant impacts on marine biodiversity. This study examined different units related to trawl fishing and found differences in abundance, species richness, diversity indices, species composition, trophic level, and vulnerability index. The study suggests that urgent modifications are needed to eliminate the discarded highly vulnerable species and improve trawl species-selectivity to minimize biodiversity losses.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Civil
Dongliang Lu, Dong Zhang, Wenjuan Zhu, Solomon Felix Dan, Bin Yang, Zhenjun Kang, Kefu Yu
Summary: This study investigated the nutrient situation in Qinzhou Bay and found that eutrophication has been exacerbated in recent years due to human activities. Overall, rivers are the main sources of nutrients in the bay, with agriculture being the primary cause. During the dry season, the concentrations of dissolved inorganic nitrogen and dissolved inorganic phosphorus increased. Maowei Sea acts as a sink system for dissolved inorganic nitrogen but a strong source system for dissolved inorganic phosphorus, surpassing riverine input, possibly due to industrial wastewater discharge. The nutrient ratios between the wet and dry seasons differ, with phosphorus limitation primarily occurring in the wet season.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Environmental Sciences
Li Zhang, Shujia Wang, Qiying Jian, Peng Zhang, Yejin Lu, Haoqi Liu
Summary: Mangroves are considered to be a sink for microplastics, and their distribution is influenced by tidal variation and human activities. This study investigated the abundance and distribution of microplastics in mangroves from the Beibu Gulf, South China Sea, and found that microplastics were widely present in the sediment samples, with variations among sampling sites and tidal zones.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Lei Yan, Bingzhong Yang, Peng Zhang, Jie Li, Teng Wang
Summary: This study conducted experiments to assess the selectivity of diamond mesh codends in capturing largehead hairtail in the Beibu Gulf. Different mesh sizes were used, and models were fitted to the catch data to determine the best fit curve. It was found that the present minimum mesh size did not match the landing size and suggestions for the optimal configuration and mesh size were made.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Robert J. Latour, James Gartland, Christopher F. Bonzek
Summary: Fisheries-independent surveys are important for fisheries management and ecosystem science, but the need to maintain historic sampling protocols limits the use of new technologies for data collection.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Ting-Juan Liao, Benjamin F. Chao
Summary: This study focuses on the variation of the global mean sea level on interannual-decadal timescales and investigates the influences of climatic oscillations. Correlation analyses reveal high correlation between the global mean sea level and El Nino-Southern Oscillation, Pacific Decadal Oscillation, and Atlantic Multidecadal Oscillation, while weak or practically no correlation is found with Arctic Oscillation and Antarctic Oscillation.
Article
Engineering, Environmental
Chang-Gui Pan, Shao-Ke Xiao, Ke-Fu Yu, Qi Wu, Ying-Hui Wang
Summary: The study investigated the occurrence, bioaccumulation, and trophic magnification of legacy and alternative PFAS in subtropical marine food webs in the Beibu Gulf, South China. The results showed that most PFAS exhibited low bioaccumulation levels, with only a few substances showing trophic magnification. Overall, the risk of PFAS exposure through consumption of marine organisms was found to be relatively low.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Zack S. Oyafuso, Lewis A. K. Barnett, Margaret C. Siple, Daniel W. Cooper, Stan Kotwicki
Summary: The US Chukchi Sea is a dynamic ice-driven ecosystem in the northwest of Alaska. Climate change impacts are affecting both the Arctic marine ecosystem and the coastal communities that rely on it. This analysis focused on evaluating improved sampling designs for ecological monitoring of the Chukchi Sea, specifically standardized bottom trawl surveys. The study found that a stratified random design provided the most consistent and precise estimates of abundance, making it the most robust option for future survey design changes.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Zuhao Zhu, Huihua Wei, Yao Guan, Li Zhang, Renming Jia, Pengfei Sun, Yang Yang, Zhen Zhang, Qiufeng Zhang
Summary: This study reveals notable spatial and seasonal variations in the concentration, source, and mixing of dissolved organic matter (DOM) at the land-ocean interface. DOM in the northern Beibu Gulf is influenced by river discharge, anthropogenic input, and in situ biological activity. The mixing behavior of DOM varies between nearshore and offshore waters.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Zoology
Kit Yue Kwan, Justin Bopp, Shuyan Huang, Qiao Chen, Chun-Chieh Wang, Xueping Wang, Wenquan Zhen, Junhua Zhu, Xing Huang
Summary: The study found that the juvenile tri-spine horseshoe crab, Tachypleus tridentatus, is an ecological generalist and primarily relies on sedimentary organic matter and seagrass resources for energy, with a shift towards benthic macroinvertebrate grazers with age. Juvenile horseshoe crabs of varying sizes occupy similar trophic positions in the food web, with slight shifts as they grow. The availability of resources and ontogenetic diet shifts strongly influence the trophic dynamics of horseshoe crabs, emphasizing the importance of considering age in habitat conservation measures.
INTEGRATIVE ZOOLOGY
(2021)
Article
Oceanography
Veronica Ruiz Xomchuk, Robert D. Hetland, Lixin Qu
Summary: The occurrence of seasonal bottom hypoxia in the Northern Gulf of Mexico has been extensively studied, but little is known about internal variability and short-term shifts. This research uses a hydrodynamic model with oxygen parametrization to demonstrate the influence of physical processes with spatial and temporal scales on hypoxia development in the far-field of the Mississippi plume. Variability in advection is found to increase with decreasing temporal and spatial scales, introducing small-scale, strong anomalies in the field. Through a budget decomposition and Reynolds decomposition, the study identifies vertical flux anomalies as the primary counterbalance to sediment oxygen demand during periods of maintaining or destroying hypoxic extent.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Biology
Umberto Scacco, Tomaso Fortibuoni, Matteo Baini, Gianluca Franceschini, Dario Giani, Margherita Concato, Cristina Panti, Alessia Izzi, Michela Angiolillo
Summary: Elasmobranchs, including skates and sharks, are important for conservation due to their vulnerability to anthropogenic impacts such as bycatch from fishing. This study conducted experimental fishing campaigns in the Asinara Gulf to assess the resistance of different elasmobranch species to trawl capture. They found that skates generally fared better than sharks, with deepwater species showing worse conditions compared to coastal species. The vitality rates also varied depending on individual size. This research provides valuable data on the factors affecting elasmobranchs' resistance to trawl fishery activities.
Article
Fisheries
Jiajun Li, Yongsong Qiu, Yancong Cai, Kui Zhang, Peng Zhang, Zhiyou Jing, Qiaer Wu, Shengwei Ma, Huaxue Liu, Zuozhi Chen
Summary: With the worsening of overfishing, oceanic fisheries in the South China Sea have received increasing attention. This study analyzed the trend in fishing boats over the past decade, based on nightly satellite images. The results showed that the number of fishing boats detected by satellites was influenced by the phases of the moon. The study further classified the fishing boats into large falling net vessels and tuna fishing boats, and traced their development and distribution patterns using an algorithm.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Oceanography
Kui Zhang, Ping Geng, Jiajun Li, Youwei Xu, Muhsan Ali Kalhoro, Mingshuai Sun, Dengfu Shi, Zuozhi Chen
Summary: This study reports on the long-term variations in population structure, growth, mortality, and exploitation rate of threadfin bream in the Beibu Gulf, South China Sea. The results suggest that management measures to reduce fishing pressure have a positive influence on the biological characteristics of this commercial fish species.
ACTA OCEANOLOGICA SINICA
(2022)
Article
Green & Sustainable Science & Technology
Youwei Xu, Xiaojie Dai, Zirong Huang, Mingshuai Sun, Zuozhi Chen, Kui Zhang
Summary: Sharks play an important role in marine ecosystems by restricting and controlling the behavior and population of other species. This study assessed the stock status of four common shark bycatch species in the northern South China Sea using the length-based Bayesian biomass estimation method. The results can be used for the management of shark fisheries in the region.
Article
Environmental Sciences
Baochao Liao, Youwei Xu, Mingshuai Sun, Kui Zhang, Qun Liu
Summary: In the world, a significant portion of fisheries have not been formally analyzed and evaluated due to limited data. This has led to the development of data-poor evaluation methods. Most studies have focused on coastal fish stocks, and this study highlights the importance of considering high sea fisheries. The study compares the performance of different data-poor methods in assessing an oceanic tuna fishery.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Jun Zhang, Kui Zhang, Yan-e Jiang, Yuan-jie Li, Jiang-tao Fan, Wen-ming Yu, Zuo-zhi Chen
Summary: Three bottom trawl surveys were conducted over the northern continental slope in the South China Sea to investigate species composition, biodiversity, and community structure of demersal fish. The surveys captured a total of 252 fish species, with Perciformes dominating the catches. The species richness varied among stations and was related to depth and latitude. Differences in species composition were also observed among different depths.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Ecology
Jiangtao Fan, Zhou Fang, Shengwei Ma, Peng Zhang, Zuozhi Chen
Summary: Sthenoteuthis oualaniensis is an important economic squid resource in the South China Sea. This study analyzed the composition, age, and growth pattern of its spawning population. The results showed significant sexual differences and growth pattern variations among different populations.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Youwei Xu, Kui Zhang, Mingshuai Sun, Li Su, Zuozhi Chen
Summary: Accurate information on the temporal and spatial distribution of fish stocks is crucial for the management and conservation of fisheries resources. This study investigated the temporal and spatial variation in biomass and density of the threadfin porgy Evynnis cardinalis in the northern South China Sea continental shelf. The results showed seasonal and spatial patterns in the occurrence, biomass, and density of E. cardinalis. The highest occurrence and density were observed in summer, while the highest biomass was recorded in autumn. The density of E. cardinalis varied with depth, with lower densities in shallow and deeper waters, and higher densities at intermediate depths.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Ecology
Jiajun Li, Kui Zhang, Zhixin Ke, Jiaxing Liu, Yehui Tan, Zuozhi Chen, Huaxue Liu
Summary: We analyzed picoeukaryotes during the Luzon winter bloom using remote sensing, flow cytometry, and high throughput sequencing. The study found a seasonal increase in phytoplankton in the study area during winter, with photosynthetic picoeukaryotes being the main contributors to the total phytoplankton biomass. The distribution of different picoeukaryote communities varied, with auto- and mixotrophic picoalgae mainly in the upper layers and heterotrophic flagellates and parasites dominating the deep layers. The growth of photosynthetic picoeukaryotes was stimulated by Kuroshio-induced upwelling.
REGIONAL STUDIES IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Kui Zhang, Jun Zhang, Peng Zhang, Li Su, Xiaofan Hong, Yongsong Qiu, Zuozhi Chen
Summary: This study assessed the status of skipjack tuna stock in the South China Sea using two data-poor methods. The results showed that the stock may be heavily overfished and recommended reducing fishing effort and increasing catchable size.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Jing Qian, Jiajun Li, Kui Zhang, Yongsong Qiu, Yancong Cai, Qiaer Wu, Han Tian, Shengwei Ma, Zuozhi Chen
Summary: This study uses VMS data to analyze the spatial distribution and seasonal patterns of large-size falling-net fishing vessels in the South China Sea, as well as comparing trajectories from different provinces. The results show that the operating area of these vessels has extended southwards and the number of operational days has increased.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biodiversity Conservation
Shuai Zhang, Yiting Cao, Bingyao Chen, Peiwen Jiang, Liang Fang, Hongting Li, Zuozhi Chen, Shannan Xu, Min Li
Summary: On June 29, 2021, a whale appeared in Dapeng Bay off Guangdong Province, China. The study used environmental DNA technology to identify the species, trace its origin, and analyze its food sources. The results demonstrated that environmental DNA is an effective method for accurately determining cetacean species and monitoring their prey.
ECOLOGICAL INDICATORS
(2023)
Article
Biodiversity Conservation
Xiaofan Hong, Kui Zhang, Jiajun Li, Youwei Xu, Mingshuai Sun, Yuezhong Wang, Shannan Xu, Yancong Cai, Yongsong Qiu, Zuozhi Chen
Summary: Improving prediction of ecological responses to climate variability requires understanding the impact of climate events on local fish population dynamics. A study conducted in the Beibu Gulf found that climate events are not the best predictors for fish abundance, as fishing pressure and year have a greater impact. However, environmental variables related to interannual ONI variability can affect fish abundance in the short term. Additionally, climate change has caused fish to move to cooler coastal waters in the north, but there is no clear evidence that climatic events significantly affect fish distribution center.
Article
Biology
Miao Li, Youwei Xu, Mingshuai Sun, Jiajun Li, Xingxing Zhou, Zuozhi Chen, Kui Zhang
Summary: The impacts of climate change on fisheries resources and biodiversity are increasingly being reported. Beibu Gulf marine ecosystems and fishery productivity are expected to be affected by increased frequency and intensity of extreme ocean climate events. This study examines changes in fish biodiversity, dominant species, and community distributions in Beibu Gulf before and after El Nino and La Nina events, as well as the relationships between dominant species abundance and environmental variables. The findings show that strong El Nino and La Nina events affect the composition, abundance, and distribution of fish communities in Beibu Gulf, with small pelagic fish such as Japanese jack mackerel and Japanese scad being the most affected. The study also explores the relationships between the abundance of these two species and environmental variables using a generalized additive model. The results obtained will provide support for the implementation of more accurate and scientific fisheries management measures.
Article
Fisheries
Li Su, Youwei Xu, Yongsong Qiu, Mingshuai Sun, Kui Zhang, Zuozhi Chen
Summary: The Beibu Gulf, one of the most productive fishing grounds in the world, is experiencing rapid decline in its biotic resources due to overexploitation. The study assesses the health status of its fisheries' resources and reveals that anthropogenic disturbances, particularly overfishing, have had a serious impact on the fish community. It suggests that strict and enforceable fishery management measures should be implemented by China and Vietnam to prevent further deterioration of the resources in the gulf.
