水生生物学报2025，Vol.49Issue(12)：12-21,10.DOI:10.3724/1000-3207.2025.2025.0034
长江泸州江段人工增殖放流长江鲟幼鱼栖息分布特征及关键影响因素分析
HABITAT DISTRIBUTION CHARACTERISTICS AND KEY INFLUENCING FACTORS OF ACIPENSER DABRYANUS JUVENILES IN LUZHOU RIVER SECTION OF THE YANGTZE RIVER
摘要
Abstract
The Yangtze sturgeon(Acipenser dabryanus),an endemic rare fish of the Yangtze River Basin,relies on specific juvenile habitat distributions and key environmental factors for population restoration.Using 2023 monitoring data from the Luzhou section of the upper Yangtze River,we analyzed the spatial and temporal patterns in A.dabryanus juvenile resource density and employed a generalized additivity model(GAM)to identify critical environ-mental factors influencing their habitat distribution,focusing on areas with artificially stocked juveniles.The results showed that there were significant temporal and spatial variations in A.dabryanus juvenile density within the Luzhou section.Temporally,summer densities were significantly higher than autumn values(P<0.05).Spatially,among the eight investigated river sections,Longmatan recorded the highest density at 0.43 kg/(h·times),while Jiujucun had the lowest CPUE at 0.011 kg/(h·times),and the A.dabryanus juvenile resource density in the Longmatan section was significantly higher than that of the other sites(P<0.05),with no differences among the other seven sites(P>0.05).Flow velocity,benthic fauna density,and water temperature emerged as primary drivers,with flow velocity bias explaining the highest rate of 69.1%.Juvenile density declined sharply as flow velocity increased from 0.15 to 0.86 m/s before stabilizing;benthic fauna density correlated positively with juvenile density,meaning higher benthic biomass was associated with greater juvenile abundance.Within the 18.9 to 20.7℃temperature range,juvenile density decreased with the increase of water temperature.This study reveals the habitat distribution characteristics of A.dabryanus juvenile in the Luzhou section and the effects of flow velocity,benthic animal density,and water tempera-ture,providing a scientific basis for the habitat protection and population recovery initiatives.关键词
长江泸州江段/长江鲟幼鱼/增殖放流/分布特征/环境因子Key words
Luzhou River section of the Yangtze River/Juvenile Acipenser dabryanus/Stock enhancement/Distribu-tion characteristics/Environmental factors分类
农业科技引用本文复制引用
叶海明,李鹏程,吴金明,沈丽,李君轶,杜浩..长江泸州江段人工增殖放流长江鲟幼鱼栖息分布特征及关键影响因素分析[J].水生生物学报,2025,49(12):12-21,10.基金项目
国家自然科学基金(32102799) （32102799）
国家重点研发计划(2021YFD1200304) （2021YFD1200304）
中国水产科学研究院基本科研业务费(2023TD08)资助[Supported by the National Natural Science Foundation of China(32102799) （2023TD08）
Key Research and Development Program of China(2021YFD1200304) （2021YFD1200304）
Yangtze River Rare and Endangered Fish Conservation Innovation Team Project(2023TD08)] （2023TD08）
