环境扰动对食物网同步性与稳定性的影响  

Effects of Environmental Disturbances on Synchrony and Stability of Food Webs

作　　者：杜蔓婷 韩晓卓 DU Manting;HAN Xiaozhuo(School of Mathematics and Statistics,Guangdong University of Technology,Guangzhou Guangdong 510520,China)

机构地区：[1]广东工业大学数学与统计学院,广东广州510520

出　　处：《新疆大学学报（自然科学版中英文）》2024年第3期268-278,287,共12页Journal of Xinjiang University(Natural Science Edition in Chinese and English)

基　　金：国家自然科学基金“具有生态位构建特征的物种协同进化动态研究”(31670391)。

摘　　要：基于生态位模型,建立8个物种的食物网关系,并引入随机环境扰动因子,通过改变不同的环境波动强度和受影响的程度,重点分析了环境波动对该系统的时空动态、同步性以及稳定性的影响.主要采用傅里叶变换和小波变换方法以分析物种的变化周期及同步性.模拟结果发现:中等强度的环境波动增加了8个物种的稳定性,并且种间同步性达到较高水平,该结果与中等强度假说相一致.若环境波动强度增强,将有物种灭绝,此时顶级捕食者与其强链接的物种之间的同步性将减弱,且环境波动强度与物种间相关性影响着物种的同步周期.另外,同步强度不仅与网络连接强度有关,还与物种密度、物种营养级有关.Based on niche model,this paper has established relationships of eight species,and introduced random environmentalfluctuations factors.The article focuses on analyzing the temporal dynamic,synchrony,and stability of the system caused by different intensity of environmentalfluctuations.In this paper,Fourier transform and wavelet transform methods are mainly used in order to analyze the period and synchrony of species changes.The simulation results show that medium intensity of environmentalfluctuations increase the stability of eight species,whose interspecific synchrony intensity reach a high level,which is consistent with the intermediate disturbance hypothesis.With the increase of environmentalfluctuations,species will become extinct and synchrony between top predators and their strong-linked species will weaken.Additionally,the strength of environmentalfluctuations and interspecies correlation affect the synchrony period of species,where positive-correlated environmental changes and high intensity environmentalfluctuations shorten the synchrony period of species,while negative-correlated environmental changes lengthen the synchrony period.

关 键 词：随机扰动 同步性 稳定性 小波分析 

分 类 号：Q148[生物学—生态学]