Estimation of estuarine habitat degradation and its influence on the reproduction process of the crab Eriocheir sinensis in the Yangtze River Estuary  

作　　者：Tingting Zhang Nan Du Zhi Geng Sikai Wang Yu Gao Gang Yang Xiaorong Huang Tao Zhang Ping Zhuang Feng Zhao 

机构地区：[1]East China Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Key Laboratory of East China Sea Fishery Resources Exploitation,Ministry of Agriculture and Rural Affairs,Shanghai 200090,China

出　　处：《Ecological Processes》2023年第1期828-842,共15页生态过程（英文）

基　　金：supported by grants from the National Key R&D Program of China(2019YFD0901202);the National Natural Science Foundation of China(grant Nos.32071584,32072982&32271658);the Program of Shanghai Academic Research Leader(21XD1405000).

摘　　要：Background The provision of habitat for fishery species in estuaries is highly valued and represents one of the most challenging ecosystem service values to quantify.However,quantifying this value is challenging due to complex relationships between habitat change,ecological processes,and environmental variations.This study aims to estimate estuarine habitat degradation and its impact on the reproduction process of the crab Eriocheir sinensis by characterizing the changes in breeding habitat and investigating relationships between the species and its habitat in the Yang-tze River Estuary.Methods A species distribution model recently developed was applied to estimate the extent and quality of breeding habitat changes from 2014-2021.The intrinsic(physiological)and external(structural)reproductive attributes of the breeding process were measured to assess the effects of habitat change.The relationships among habitat change,reproductive attributes and environmental factors were analyzed to understand the underlying driving forces of habitat degradation for breeding process by multivariate statistical analysis.Results About 34.24%of essential habitat was lost,mainly in highly suitable areas due to reclamation and waterway construction.Habitat degradation significantly affects female distribution and their reproductive processes,particularly gonad development during the pre-reproductive period and fecundity during the reproductive period,without altering population structure.These results indicated that the main ecological function served by the highly suitable breeding ground was the provision for development of gonad and improvement of fecundity.Increases of salinity and turbidity,caused by hydrodynamic changes from large-scale waterway construction,were identified as the environmental determinants contributing to cumulative habitat degradation.These influences ultimately led to a decrease in the fecundity of E.sinensis.Conclusions Our research sheds light on the quantification of habitat degradation in the Yangtze Ri

关 键 词：Fishery habitat provision Breeding habitat degradation Reproductive process Estuarine ecosystem 

分 类 号：Q95[生物学—动物学]