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  • A new method for determining the foot point of the continental slope (FOS) was proposed for the delineation of the continental shelf in a complex geological context. This method calculated the location of the foot of slope based on the mean gradient of water depth and optimized it by combining the contrary evidence and the principles of convexity, segmentation and continuity. Using the southern continental margin of Mozambique as the study area, the method was applied to extract the most critical basis—FOS for continental shelf delineation using high-precision multibeam topographic data measured in 2021, and the result was confirmed by comparison with those extracted by the Geocap software which is used by the United Nations Commission on the Limits of the Continental shelf, proving the effectiveness and accuracy of this method.

  • Erythrobacteraceae is widely distributed in marine environments and can synthesize various pigments such as carotenoids. Carotenoids have photoprotective and antioxidant abilities, and they can play a crucial role in the adaptation of Erythrobacteraceae to marine ecosystems. In this study, we obtained the genomes of 107 marine Erythrobacteriaceae strains, analyzed the distribution characteristics of carotenoid biosynthesis genes including crtEBIGYZW in their genomes, constructed phylogenetic trees based on the amino acid sequences of the carotenoid biosynthesis genes, and elucidated the presence and distribution of carotenoid biosynthesis genes in Erythrobacteriaceae from deep-sea and shallow-sea sources. The results suggested that all of marine Erythrobacteriaceae strains contained the crtEIGZ genes, 98.1% of strains contained the crtBY genes, and 43.9% of them contained the crtW gene, which differed among strains but no any specificities found among the deep-sea or shallow-sea sources. Additionally, in the comparison of the phylogenetic topology, it was found that the crtBYZW genes were vertically transferred from their ancestor, while the crtEIG genes were mainly horizontal gene transferred. Our study aids in the understanding of the carotenoid biosynthesis gene evolution in the family Erythrobacteriaceae and also serves as a scientific basis for the study of carotenoid synthesis pathways and genes in other marine bacteria, enables a thorough understanding of marine carotenoid-synthesizing strains.

  • Acoustic characteristics of rocks from the SWIR hydrothermal fields
    JIE Tianyu, ZHOU Jianping, TAO Chunhui, WANG Hanchuang, LI Qianyu, WU Tao, LIU Long
    2024, 42(1):1-12. DOI:10.3969/j.issn.1001-909X.2024.01.001
    Abstract ( 52 ) HTML ( 16 ) PDF ( 5498KB ) ( 69 )   
  • Method for determining the foot point of continental slope in complex geological background: Take the southern continental margin of Mozambique as an example
    ZHUANG Baojiang, TANG Yong, LÜ Xiaohui, YANG Chunguo, WU Zhaocai, LI He
    2024, 42(1):13-22. DOI:10.3969/j.issn.1001-909X.2024.01.002
    Abstract ( 64 ) HTML ( 10 ) PDF ( 6192KB ) ( 59 )   
  • Classification and genesis of deep-sea REY-rich sediments in the Pacific Ocean
    WANG Tianyi, DONG Yanhui, CHU Fengyou, SHI Xuefa, LI Xiaohu, SU Rong, ZHANG Weiyan
    2024, 42(1):23-35. DOI:10.3969/j.issn.1001-909X.2024.01.003
    Abstract ( 45 ) HTML ( 2 ) PDF ( 8050KB ) ( 34 )   
  • Spatio-temporal variation of suspended sediment and its dynamic factors in Liaohe Estuary
    ZHAO Xuekai, GUO Kaiyuan, ZHOU Yunhao, JIA Liyuan, YANG Zhibo, ZHANG Qinxu, ZHANG Mingliang
    2024, 42(1):36-46. DOI:10.3969/j.issn.1001-909X.2024.01.004
    Abstract ( 44 ) HTML ( 11 ) PDF ( 13102KB ) ( 29 )   
  • Acoustic propagation characteristics of horizontally varying double duct waveguides under Arctic ice
    KE Lei, WU Shaowei
    2024, 42(1):47-57. DOI:10.3969/j.issn.1001-909X.2024.01.005
    Abstract ( 59 ) HTML ( 2 ) PDF ( 15323KB ) ( 35 )   
  • Composed structure of mesoscale eddy in the Northwest Pacific Ocean and its influence on acoustic propagation
    ZHANG Xudong, QIU Zhongfeng, MAO Kefeng, WANG Penghao
    2024, 42(1):58-68. DOI:10.3969/j.issn.1001-909X.2024.01.006
    Abstract ( 49 ) HTML ( 7 ) PDF ( 12739KB ) ( 28 )   
  • Prediction of UIva prolifera drift and transportation based on remote sensing data and numerical models: A case study in the offshore area of Jiangsu Province
    LIN Lianjie, DONG Changming, JI Yuxiang, LIM KAM SIAN Kenny Thiam Choy, LI Zhaoxin, JIANG Xingliang, CAO Yuhan, GAO Hui, WANG Shengqiang, CAO Qian
    2024, 42(1):69-82. DOI:10.3969/j.issn.1001-909X.2024.01.007
    Abstract ( 61 ) HTML ( 8 ) PDF ( 20955KB ) ( 52 )   
  • Evaluation of intertidal single-beam bathymetric spatial interpolation accuracy based on UAV photogrammetry
    MA Haibo, LAI Xianghua, HU Taojun, FU Xiaoming
    2024, 42(1):83-90. DOI:10.3969/j.issn.1001-909X.2024.01.008
    Abstract ( 37 ) HTML ( 5 ) PDF ( 6335KB ) ( 38 )   
  • Investigation of carotenoid biosynthesis genes in marine Erythrobacteraceae strains
    YUE Xiaolan, XU Lin, FU Geyi, XU Xuewei
    2024, 42(1):91-105. DOI:10.3969/j.issn.1001-909X.2024.01.009
    Abstract ( 48 ) HTML ( 4 ) PDF ( 23947KB ) ( 24 )   
  • The influence mechanism of sea surface temperature on the resource change of Sthenoteuthis oualaniensis in Nansha sea area, South China Sea
    WU Wenxiu, XU Xinwen, CHENG Shuxing, ZHAO Chunxu, GUO Youjun, SHEN Chunyan, YAN Yunrong
    2024, 42(1):106-116. DOI:10.3969/j.issn.1001-909X.2024.01.010
    Abstract ( 35 ) HTML ( 95 ) PDF ( 11524KB ) ( 18 )   
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