Articles | Volume 22, issue 18
https://doi.org/10.5194/bg-22-4763-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-4763-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Benthic ostracod diversity and biogeography in an urban semi-enclosed eutrophic riverine bay
Jialu Huang
CORRESPONDING AUTHOR
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Zhou Long Quan Building, 4221 Xiang'an South Road, Xiamen 361102, China
School of Biological Sciences, Swire Institute of Marine Science, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong SAR, China
State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
School of Energy and Environment, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
Moriaki Yasuhara
CORRESPONDING AUTHOR
State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
School of Energy and Environment, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
He Wang
CORRESPONDING AUTHOR
School of Biological Sciences, Swire Institute of Marine Science, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong SAR, China
State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China
Pedro Julião Jimenez
School of Biological Sciences, Swire Institute of Marine Science, The University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong SAR, China
State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
School of Energy and Environment, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
Jiying Li
State Key Laboratory of Marine Environmental Health, City University of Hong Kong, Yeung Kin Man Academic Building, Tat Chee Avenue, Hong Kong SAR, China
Department of Ocean Science, Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
Minhan Dai
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Zhou Long Quan Building, 4221 Xiang'an South Road, Xiamen 361102, China
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Biogeosciences, 22, 3681–3697, https://doi.org/10.5194/bg-22-3681-2025, https://doi.org/10.5194/bg-22-3681-2025, 2025
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We revisited a 19th-century taxonomic study on Hong Kong marine ostracods (the first study on Chinese marine ostracods) to compare it with a 21st-century survey. We found substantial differences in species, likely related to differences in pollution and climate between the 19th and 21st centuries. This discovery highlights the importance of historical ecology. Early natural historians documented "natural baseline" ecosystems before the substantial human presence with industrialization.
Michael R. Roman, Andrew H. Altieri, Denise Breitburg, Erica M. Ferrer, Natalya D. Gallo, Shin-ichi Ito, Karin Limburg, Kenneth Rose, Moriaki Yasuhara, and Lisa A. Levin
Biogeosciences, 21, 4975–5004, https://doi.org/10.5194/bg-21-4975-2024, https://doi.org/10.5194/bg-21-4975-2024, 2024
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Oxygen-depleted ocean waters have increased worldwide. In order to improve our understanding of the impacts of this oxygen loss on marine life it is essential that we develop reliable indicators that track the negative impacts of low oxygen. We review various indicators of low-oxygen stress for marine animals including their use, research needs, and application to confront the challenges of ocean oxygen loss.
Skye Yunshu Tian, Martin Langer, Moriaki Yasuhara, and Chih-Lin Wei
Biogeosciences, 21, 3523–3536, https://doi.org/10.5194/bg-21-3523-2024, https://doi.org/10.5194/bg-21-3523-2024, 2024
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Through the first large-scale study of meiobenthic ostracods from the diverse and productive reef ecosystem in the Zanzibar Archipelago, Tanzania, we found that the diversity and composition of ostracod assemblages as controlled by benthic habitats and human impacts were indicative of overall reef health, and we highlighted the usefulness of ostracods as a model proxy to monitor and understand the degradation of reef ecosystems from the coral-dominated phase to the algae-dominated phase.
Yanmin Wang, Xianghui Guo, Guizhi Wang, Lifang Wang, Tao Huang, Yan Li, Zhe Wang, and Minhan Dai
EGUsphere, https://doi.org/10.5194/egusphere-2023-3155, https://doi.org/10.5194/egusphere-2023-3155, 2024
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This study reports higher nutrient release in fish farming system compared to river inputs and other sources with implications for coastal environment. DIN and DIP variation in Sansha Bay are dominated by mariculture activity relative to river input during spring. The N/P budget shows that 52.8 ± 4.7 % of DIN and 33.0 ± 3.7 % of DIP released from fish feeds exceeded other nutrient inputs. Co-culture strategies (e.g., of fish, kelp and oysters) allow effective mitigation of environmental impacts.
Yifan Ma, Kuanbo Zhou, Weifang Chen, Junhui Chen, Jin-Yu Terence Yang, and Minhan Dai
Biogeosciences, 20, 2013–2030, https://doi.org/10.5194/bg-20-2013-2023, https://doi.org/10.5194/bg-20-2013-2023, 2023
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We distinguished particulate organic carbon (POC) export fluxes out of the nutrient-depleted layer (NDL) and the euphotic zone. The amount of POC export flux at the NDL base suggests that the NDL could be a hotspot of particle export. The substantial POC export flux at the NDL base challenges traditional concepts that the NDL was limited in terms of POC export. The dominant nutrient source for POC export fluxes should be subsurface nutrients, which was determined by 15N isotopic mass balance.
Zhixuan Wang, Guizhi Wang, Xianghui Guo, Yan Bai, Yi Xu, and Minhan Dai
Earth Syst. Sci. Data, 15, 1711–1731, https://doi.org/10.5194/essd-15-1711-2023, https://doi.org/10.5194/essd-15-1711-2023, 2023
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We reconstructed monthly sea surface pCO2 data with a high spatial resolution in the South China Sea (SCS) from 2003 to 2020. We validate our reconstruction with three independent testing datasets and present a new method to assess the uncertainty of the data. The results strongly suggest that our reconstruction effectively captures the main features of the spatiotemporal patterns of pCO2 in the SCS. Using this dataset, we found that the SCS is overall a weak source of atmospheric CO2.
Yangyang Zhao, Khanittha Uthaipan, Zhongming Lu, Yan Li, Jing Liu, Hongbin Liu, Jianping Gan, Feifei Meng, and Minhan Dai
Biogeosciences, 18, 2755–2775, https://doi.org/10.5194/bg-18-2755-2021, https://doi.org/10.5194/bg-18-2755-2021, 2021
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In situ oxygen consumption rates were estimated for the first time during destruction of coastal hypoxia as disturbed by a typhoon and its reinstatement in the South China Sea off the Pearl River estuary. The reinstatement of summer hypoxia was rapid with a comparable timescale with that of its initial disturbance from frequent tropical cyclones, which has important implications for better understanding the intermittent nature of coastal hypoxia and its prediction in a changing climate.
Guizhi Wang, Samuel S. P. Shen, Yao Chen, Yan Bai, Huan Qin, Zhixuan Wang, Baoshan Chen, Xianghui Guo, and Minhan Dai
Earth Syst. Sci. Data, 13, 1403–1417, https://doi.org/10.5194/essd-13-1403-2021, https://doi.org/10.5194/essd-13-1403-2021, 2021
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Yanhong Lu, Shunyan Cheung, Ling Chen, Shuh-Ji Kao, Xiaomin Xia, Jianping Gan, Minhan Dai, and Hongbin Liu
Biogeosciences, 17, 6017–6032, https://doi.org/10.5194/bg-17-6017-2020, https://doi.org/10.5194/bg-17-6017-2020, 2020
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Through a comprehensive investigation, we observed differential niche partitioning among diverse ammonia-oxidizing archaea (AOA) sublineages in a typical subtropical estuary. Distinct AOA communities observed at DNA and RNA levels suggested that a strong divergence in ammonia-oxidizing activity among different AOA groups occurs. Our result highlights the importance of identifying major ammonia oxidizers at RNA level in future studies.
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Short summary
We investigated the abundance, diversity, composition, and distribution of ostracods (a meiobenthic group) and their interactions with eutrophication and pollution through high-resolution sampling of surface sediment in Deep Bay, a small semi-enclosed riverine bay adjacent to two of the world’s most populated cities: Hong Kong and Shenzhen. The results support the idea that ostracods are a useful bioindicator of coastal benthic ecosystems shaped by distinct environmental problems.
We investigated the abundance, diversity, composition, and distribution of ostracods (a...
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