生态科学2023，Vol.42Issue(6)：1-10,10.DOI:10.14108/j.cnki.1008-8873.2023.06.001
基于围隔实验研究鳙在亚热带贫-中营养水库的下行效应
Research about top-down effects of bighead carp(Aristichthys nobilis)in a subtropical,oligo-mesotrophic reservoir based on an enclosure experiment
摘要
Abstract
To examine the top-down effects of bighead carp(Aristichthys nobilis)in freshwaters with a low trophic state,an in situ enclosure experiment was carried out during the autumn-winter period in a subtropical,oligo-mesotrophic reservoir located in Guangdong Province,China by manipulating the biomass(0 g·m-3 vs.3 g·m-3)of bighead carp.Bighead carp stocking had no significant effect on total nitrogen(TN),total phosphorus(TP),TN:TP mass ratio,and chlorophyll a.In all enclosures,the zooplankton community was dominated by small-sized species,with Daphnia being scarce.The abundance of rotifers and cyclopoids was markedly increased with fish addition,whereas the abundance of cladocerans and calanoids was negatively affected by fish,thereby significantly lowering total zooplankton biomass and the biomass of cladocerans and copepods.Also,selective predation by bighead carp significantly reduced mean crustacean length from 547-592 μm to 352-396 μm.The biomass of Chlorophyta and large phytoplankton(greatest axial linear dimension,GALD≥30 μm)showed positive response to fish addition.In contrast,there was no significant effect of fish on the biomass of Bacillariophyta,Chrysophyta,Pyrrophyta and small phytoplankton(GALD<30 μm),as well as total phytoplankton biomass.These results indicate that bighead carp had a strong top-down effect on the zooplankton community,but exerted no cascading effect on the phytoplankton community.Our findings suggest that during the low-temperature season,bighead carp may have margin effects on the water quality in low trophic-state waterbodies lacking large-bodied herbivorous cladocerans.关键词
滤食性鱼类/低营养水平/级联效应/浮游动物/浮游植物/大型枝角类/营养循环Key words
filter-feeding fish/low trophic state/trophic cascade effects/zooplankton/phytoplankton/large-bodied herbivorous cladoceran/nutrient cycling分类
生物科学引用本文复制引用
赵帅营,孙育平,韩博平..基于围隔实验研究鳙在亚热带贫-中营养水库的下行效应[J].生态科学,2023,42(6):1-10,10.基金项目
国家自然科学基金项目(31460131,31960250) （31460131,31960250）
国家留学基金委"西部地区人才培养特别项目"(201508535008) （201508535008）
云南省John P.Smol院士工作站(202005AF150005) （202005AF150005）
