Impacts of species depletion on the food web structure of a marine ecosystem based on topological network analysis

作     者：Congjun Xu Jun Xu Fan Li Yiping Ren Ying Xue Congjun Xu;Jun Xu;Fan Li;Yiping Ren;Ying Xue

作者机构：Laboratory of Fisheries Ecosystem Monitoring and AssessmentCollege of FisheriesOcean University of ChinaQingdao 266003China Shandong Provincial Key Laboratory of Restoration for Marine EcologyShandong Marine Resources and Environment Research InstituteYantai 264006China Field Observation and Research Station of Haizhou Bay Fishery Ecosystem(Ocean University of China)Ministry of EducationQingdao 266003China Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第11期

页      面：136-145页

核心收录：

学科分类：070703[理学-海洋生物学] 07[理学] 0707[理学-海洋科学] 

基　　金：The National Key R&D Program of China under contract No.2018YFD0900904 the National Natural Science Foundation of China under contract Nos 31772852 and 31802301 

主　　题：Haizhou Bay most-connected target species food web structure depletion fishery management feeding strategy 

摘      要：Single-species management ignores the interactions between species,and ecosystem-based fisheries management(EBFM)has become a main method to fisheries *** food web structures and species interactions is essential for the implementation of EBFM and maintenance of ecosystem *** is one of the main reasons behind the depletion,which could even lead to the depletion of some target species in local *** understanding the impacts of species depletion on food web structures is important for the implementation of *** impacts of species depletion can be transmitted through the food web and cause the local extinction of both target and non-target *** this study,topological network analysis was applied to examine the impacts of species depletion on the food web structure of Haizhou *** showed that fine crayfish Leptochela gracilis,squid Loligo sp.,and Japanese snapping shrimp Alpheus japonicus have the highest numbers of outgoing links(48,32 and 31 respectively);thus,these species may be considered key prey *** conger Conger myriaster,fat greenling Hexagrammos otakii,and bluefin gurnard Chelidonichthys kumu were key predators with the highest number of incoming links(37,36 and 35 respectively).The competition graphs derived from the Haizhou Bay food web were highly connected(more than 40%predators sharing over 10 common prey species),and showed close trophic interaction between high trophic level *** analysis showed that the food web structure has small changes to the depletion of species in a highly complex food *** most-connected target species did not necessarily indicate high structural importance;however,some species with low connectivity may demonstrate stronger trophic interactions and play important ecological roles in the food *** most species were more sensitive to the depletion of the most-connected target species than other target species(for instance,for zooplankto