水生生物学报2026，Vol.50Issue(4)：29-41,13.DOI:10.3724/1000-3207.2025.2025.0298
基于碳、氮稳定同位素的黑水河鱼类营养结构的季节性变化特征
SEASONAL VARIATION IN FISH TROPHIC STRUCTURE OF THE HEISHUI RIVER BASED ON CARBON AND NITROGEN STABLE ISOTOPES
摘要
Abstract
To investigate the characteristics and seasonal variations of the aquatic food web in the Heishui River Basin,fishery resources were collected from different river sections in July(wet season)and November(dry season)of 2024.Based on the carbon and nitrogen stable isotope values of the main consumers and prey organisms,the SIBER model was used to analyze the seasonal differences in fish trophic levels and community trophic structure.The δ13C values of organisms ranged from –20.45‰ to –5.27‰ in the wet season and and from –29.40‰ to –1.12‰ in the dry season;δ15N values ranged from 0.88‰ to 14.68‰ in the wet season and from 0.87‰ to 12.66‰ in the dry season.The trophic level of fish ranged from 1.817 to 3.918,with no significant overall difference between the wet and dry seasons(P>0.05).However,significant seasonal variations occurred in certain species:the average trophic level of Abbottina obtusirostris and Zacco platypus was significantly higher in the wet season(P<0.001),whereas that of Schistura fascio-latawas was significantly higher in the dry season(P<0.01).These findings reflect species-specific adaptations to seasonal hydrology and food resource changes.Trophic structure indices(NR,CR,TA,CD,MNND,and SDNND)were generally higher in the dry season,indicating a more diverse basal food source,more distinct trophic niche diffe-rentiation,higher community diversity,weaker interspecific trophic competition,and lower trophic redundancy during the dry season.These results provide a case reference for food webs research in mountain river ecosystems and offer a theoretical basis for ecosystem health assessment and targeted conservation management of the Heishui River.关键词
黑水河/食物网/稳定同位素/鱼类/营养结构/季节变化Key words
the Heishui River/Food webs/Stable isotopes/Fish/Trophic structure/Seasonal variation分类
农业科技引用本文复制引用
李文静,李博,胡凡旭,姜伟..基于碳、氮稳定同位素的黑水河鱼类营养结构的季节性变化特征[J].水生生物学报,2026,50(4):29-41,13.基金项目
国家重点研发计划(2022YFC3204200) （2022YFC3204200）
中国长江三峡集团有限公司科研项目(NBWL202200489-07和NBZZ20220230)资助[Supported by the National Key Research&Development Program of China(2022YFC3204200) （NBWL202200489-07和NBZZ20220230）
the Research Project of China Three Gorges Corporation(NBWL202200489-07 and NBZZ20220230)] （NBWL202200489-07 and NBZZ20220230）
