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  • Baidu CSCD
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    Study on the health assessment method of typical coral reef ecosystem in the South China Sea
    WU Yingying, LEI Xinming, HUANG Hui, ZHANG Yuyang, DING Dewen
    Journal of Tropical Oceanography    2021, 40 (4): 84-97.   DOI: 10.11978/2020070
    Abstract659)   HTML404)    PDF (1234KB)(442)      

    In this paper, we discuss the principle of ecosystem complexity, and propose a method for evaluating the health of typical coral reef ecosystems in the South China Sea-"Organization and System Function Evaluation." The evaluation framework of this method includes four modules: the structure and function of coral reef ecosystems, the relationship between coral reef ecosystems and other marine ecosystems, the relationship with human social ecosystems, and the development constraints of coral reef ecosystems. The evaluation index system is divided into six levels, including target level, criterion level, factor level, and element level, totaling 67 indicators. We systematically put forward the process of coral reef ecosystem health evaluation, which improves the standardization and timeliness of coral reef health evaluation. The organizing power and system function evaluation method was used to evaluate the health of the coral reef ecosystem of the Paracel Islands from 2011 to 2018. The results show that the health index has fallen by 2.3%-2.4% annually since 2011. Except for a slight rebound in 2012 and 2015, the health index has shown a downward trend in the rest of the years. The overall evaluation is that the coral reef ecosystem of the Paracel Islands is sub-healthy. This result is consistent with the results of field investigations and questionnaire surveys on residents' lives around the Qilianyu Islands. We find that the development of fisheries in 2006-2008, the flooding of starfish in 2012, and the construction of islands and reefs in 2014-2015 had great impacts on the coral reef ecosystem. The fishery output dropped by 50%-80% in 10 years, which is also consistent with the evaluation results. It verifies the science and feasibility of the evaluation method from another angle.

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    Cited: CSCD(2)
    Research status and development trends of natural products from marine microorganisms
    MA Lili, TIAN Xinpeng, LI Guiju, ZHAO Yanqiang, YIN Jianping
    Journal of Tropical Oceanography    2021, 40 (5): 134-146.   DOI: 10.11978/2020104
    Abstract2044)   HTML1196)    PDF (3887KB)(1264)      

    Because of their unique habitat and metabolic pathways, marine microorganisms can produce a variety of bioactive substances with novel structures and functions, which make natural products from these marine microorganisms become a research hotspot of new marine drugs. Combining the methods and perspectives of bibliometrics, we review in this paper the research status of natural products from marine fungi and marine bacteria, the artificial synthesis of natural products of marine microorganisms, the biological activity and druggability evaluation of natural products from marine microorganisms, to clarify the current status and development trend of natural products from marine microorganisms.

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    New understanding about Chemical Oceanography in the South China Sea since 1980
    SONG Jinming, WANG Qidong
    Journal of Tropical Oceanography    2021, 40 (3): 15-24.   DOI: 10.11978/YG2020010
    Abstract758)   HTML441)    PDF (550KB)(424)      

    As the largest marginal sea in the western Pacific, the South China Sea (SCS) plays an important role in the global ocean and the global oceanographic research. In the past 40 years, chemical oceanographic research in the SCS achieved systematic new discoveries and new understandings; researchers put forward many new theoretical viewpoints, making important contributions to the development of oceanography. A subsurface layer was revealed in the SCS, maximum values of ecological environmental parameters represented by nitrite are present; and the depth ranges of water layers for different parameters are different, forming a thermocline ecosystem that has significantly different characteristics from the other ecosystems. The carbon cycle process in the SCS is very complex, and changes of the biological pump controlled by biological activities, and the regional and seasonal changes of carbon sources and sinks, are all great. The characteristics and intensity of carbon sources and sinks in the SCS are unique in different regions at different times. Annually, the SCS is a weak source of atmospheric carbon dioxide. The characteristics of ecological environment and the cycling process of chemical material in the Pearl River Estuary and deep-sea basins were found not only closely related to but also significantly different from that in shelf marginal seas and coral reefs, as the dissolved oxygen concentration is low in the bottom, and the Pearl River Estuary is basically an ecologically fragile area characterized by hypoxia. Based on the systematic understanding of the rapid material circulation and vertical transfer of chemical substances controlled by biological processes in the Nansha coral reef ecosystem, a new mechanism - “resembling drift-net theory” - was proposed to explain how the coral reef ecosystem could maintain high productivity. Systematic studies on the sedimentary chemistry of the SCS show that there is a close coupling between the sediments and chemical cycling of water bodies. The distribution of chemical substances in coral reefs or in sediment cores of the SCS can be used to retrieve historical environment changes. The paleo productivity of surface seawater in the SCS during the glacial period was 1.6 times higher than that of the interglacial period. A "biological explosion event" occurred in the southern SCS in the late Miocene. The productivity in that period was mainly affected by the monsoon and terrigenous nutrients input, while the influences of northeast monsoon and southwest monsoon differed in different regions. These new discoveries and new understandings in chemical oceanography of the SCS in the past 40 years have laid a strong foundation for further systematic and in-depth understanding of the oceanographic processes in the region. In the future, chemical oceanographic research will definitely provide scientific support for the sustainable utilization of resources and environment in the SCS.

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