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Dynamic simulation of tropical coral reef ecosystem being disturbed by multiple situations

Acta Oceanologica Sinica 2021年第9期40卷 105-116页

作者： Geng Wang Rui Dong Huimin Xu Dewen Ding School of Geography Liaoning Normal UniversityDalian 116029China Ocean College Beibu Gulf UniversityQinzhou 535011China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266071China South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301China

In consideration of the rapid degradation of coral reef ecosystems, the establishment of models is helpful to comprehend the degradation mechanism of coral reef ecosystems and predict the development process of coral reef communities. According to the characteristics of complex ecosystem of tropical coral reefs in China, the coral reef functional group is the core level variable;combined with the multiple feedback effects of coral reef functional groups and environmental changes, the study presents a coral reef ecosystem dynamics model with hermatypic corals as the core. Based on the simulation of the assumed initial value and the internal feedback of the system, the results show that in the basic simulation(relative health conditions), the coverage area of live corals and coral reefs generally decreased first and then increased, and increased by 4.67% and 6.38% between2010 and 2050, respectively. Based on the calibration model and the current situation of the studied area, the multi-factor disturbance effects of coral reef communities were simulated and explored by setting up three scenarios involving fishing policy, terrestrial deposition, and inorganic nitrogen emissions. Among them, in the single factor disturbance, the fishing policy exerts the most direct impact on the community decline;and the succession phenomenon is obvious;the terrestrial sedimentation has a faster and more integrated effect on the community decline;the effect of inorganic nitrogen emission on the community decline is relatively slow. In the double/multi-factor disturbance, the superimposed disturbance will aggravate the multi-source feedback effect of the coral reef communities development, accelerate the community decay rate, and make its development trajectory more complicated and diverse. This method provides a scientific and feasible method for simulating the damage of long-term coral reef community and exploring the development law and adaptive management of coral reef ecosystems. In

关键词： coral reef ecosystem system dynamics situational disturbance simulation

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维普期刊数据库

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Dietary separation between co-occurring copepods in a food-limited tropical coral reef of the Sanya Bay

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Acta Oceanologica Sinica 2020年第4期39卷 65-72页

作者： Simin Hu Tao Li Sheng Liu Hui Huang Key Laboratory of Tropical Marine Bio-Resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Guangdong Provincial Key Laboratory of Applied Marine Biology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Tropical Marine Biological Research Station in Hainan Chinese Academy of SciencesSanya 572000China

Food differentiation among coexistent species in the field is important strategy for copepods to acquire materials and maintain population *** situ diet analysis of co-occurring six copepod species in coral waters of the Sanya Bay was conducted using a PCR protocol based on 18 S ribosomal *** prey organisms were uncovered,including dinoflagellate,diatom,green algae and plant,protozoa and *** these spatially coexisting six species showed different dietary diversity,with the food niche breadth(B)ranging from 1.00(Temora turbinate in morning)to 10.68(Calanopia elliptica in night).While food overlap between all these copepods were low,with the average value of the diet niche overlap index being approximately *** temporally co-existing species sampled from the same time point fed on different groups of prey items with the food overlap index of 0.04 to 0.07 in midday and night but 0 in *** the most important dominant copepod in the Sanya Bay,Subeucalanus subcrassus seems to be capable to regulate its feeding,by exhibiting a rhythm of herbivorous feeding in midday and carnivorous feeding in morning and night,to better coordinate with other competitors for utilization of food *** most copepods,none of the prey items belonged to the dominant phytoplankton in the ambient water,indicating that copepod can better their survival by widening the choice of potential food resources in food limited *** dietary separation observed here might be important strategy for copepod to maintain population stabilization and thriving in the Sanya coastal waters.

关键词： copepod food partitioning Sanya Bay coral reef ecosystem

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维普期刊数据库

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