基于稳定同位素的定量网络视角分析关键物种

IF 3.1 3区 环境科学与生态学 Q2 ECOLOGY Ecological Complexity Pub Date : 2024-07-11 DOI:10.1016/j.ecocom.2024.101092
Ruijing Yang , Minquan Feng , Zimeng Liu , Xuyan Wang , Zili Qu
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引用次数: 0

摘要

基于网络结构的关键物种分析越来越强调定量食物网的意义。本研究选择漳泽湖为研究对象,通过创造性地将同位素技术与拓扑重要理论、唯一性理论相结合,再结合中心性理论,对各项指标赋予加权指数。接着,利用不同尺度的指数来考察各营养元素在食物网中的重要性、各指数排序与分布的相关性以及时间上的差异。这项研究显示,浮游植物的中心度在四月明显高于七月。该生态系统中的两个月度特有物种均为浮游动物,而作为高级消费者的基石物种被确定为 Exopalaemon modestus。除加权亲近中心度和加权间度中心度外,其他指数的排序结果显示出一致性。此外,加权指数的分布与相应的非加权指数有显著差异,加权中心度指数与外度排序更相似,在四月的相关性更强。如果只考虑物种间的强相互作用,则发现物种中心度与独特性之间存在负相关。通过定量构建食物比例食物网模型,并结合多种指数,我们为全面、定量地识别关键物种提供了一个实用的解决方案,从而有助于准确、有效地保护生物多样性。
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Analysis of keystone species in a quantitative network perspective based on stable isotopes

The analysis of keystone species based on network structure has increasingly emphasized the significance of quantitative food webs. In this study, Zhangze Lake was chosen as the research subject, and assigned a weighted index to each index by creatively combined isotope techniques with topological important and uniqueness theories, then united centrality theory. Next, various scales of indices were used to examine the importance of each nutrient in the food web, the correlation between the ordering and distribution across indices, and the difference in time. This study revealed that the centrality of phytoplankton was significantly higher in April compared to July. Both of the monthly unique species in this ecosystem were planktivorous feeders, while the keystone species serving as higher consumers were identified to be Exopalaemon modestus. The ranking results of the indices other than the weighted closeness centrality and weighted betweenness centrality showed consistency. Additionally, the distributions of the weighted indices differed significantly from their corresponding unweighted indices, with the weighted centrality indices being more similar to the out-degree ordering and more strongly correlated in April. When only strong interactions between species were considered, there was a negative correlation found between species centrality and uniqueness. Through the quantitative construction of a diet proportion food web model, combined with multiple indices, we have provided a practical solution for holistically and quantitatively identifying key species, thus aiding in the accurate and effective protection of biodiversity.

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来源期刊
Ecological Complexity
Ecological Complexity 环境科学-生态学
CiteScore
7.10
自引率
0.00%
发文量
24
审稿时长
3 months
期刊介绍: Ecological Complexity is an international journal devoted to the publication of high quality, peer-reviewed articles on all aspects of biocomplexity in the environment, theoretical ecology, and special issues on topics of current interest. The scope of the journal is wide and interdisciplinary with an integrated and quantitative approach. The journal particularly encourages submission of papers that integrate natural and social processes at appropriately broad spatio-temporal scales. Ecological Complexity will publish research into the following areas: • All aspects of biocomplexity in the environment and theoretical ecology • Ecosystems and biospheres as complex adaptive systems • Self-organization of spatially extended ecosystems • Emergent properties and structures of complex ecosystems • Ecological pattern formation in space and time • The role of biophysical constraints and evolutionary attractors on species assemblages • Ecological scaling (scale invariance, scale covariance and across scale dynamics), allometry, and hierarchy theory • Ecological topology and networks • Studies towards an ecology of complex systems • Complex systems approaches for the study of dynamic human-environment interactions • Using knowledge of nonlinear phenomena to better guide policy development for adaptation strategies and mitigation to environmental change • New tools and methods for studying ecological complexity
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