Effect of allelochemicals sustained-release microspheres on the ingestion, incorporation, and digestion abilities of Daphnia magna Straus  

作　　者：Benhang Li Yijun Yin Xiaohong Zhou Li Feng Yongze Liu Ziwen Du Yajun Tian Liqiu Zhang 

机构地区：[1]Beijing Key Laboratory for Source Control Technology of Water Pollution,Engineering Research Center for Water Pollution Source Control and Ecoremediation,Beijing Forestry University,Beijing 100083,China [2]College of Environment,Zhejiang University of Technology,Hangzhou 310014,China

出　　处：《Journal of Environmental Sciences》2023年第2期205-214,共10页环境科学学报（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos. 41977317, 42177051);Beijing Natural Science Foundation (No. 8182037)

摘　　要：Allelochemicals sustained-release microspheres(ACs-SMs)exhibited great inhibition effect on algae,however,few studies have focused on ACs-SMs toxicity on invertebrate.In this study,the effects of single high-concentration ACs(15 mg/L,SH-ACs),repeated lowconcentration ACs(3×5 mg/L,RL-ACs)and ACs-SMs containing 15 mg/L ACs exposure on the ingestion,incorporation,and digestion of Daphniamagna Straus(DS)were investigated by stable isotope 15N labeling method.Meanwhile,the diversity and abundance of microflora in DS guts were determined by 16S rRNA genes and cloning methods.The results showed that SH-ACs exposure caused 50%and 33.3%death rates for newborn and adult DS,while RL-ACs exposure caused 10%death rate for newborn DS and no obvious effect on the activity of adult DS.And ACs-SMs exposure did not diminish the motility of both newborn and adult DS,indicating the lower acute toxicity of ACs-SMs.Furthermore,SH-ACs inhibited the ingestion(-6.45%),incorporation(-47.1%)and digestion(-53.8%)abilities of DS and reduced the microbial abundance(-27.7%)in DS guts.Compared with SH-ACs,RL-ACs showed relatively low impact on the ingestion(-3.23%),incorporation(-5.89%)and digestion(-23.9%)abilities of DS.Interestingly,ACs-SMs enhanced the ingestion(+9.68%),incorporation(+52.9%)and digestion(+51.3%)abilities of DS and increased the microbial abundance(+10.7%)in DS guts.Overall ACs and ACs-SMs reduced the diversity of microflora in DS guts.In conclusion,ACs-SMs can release ACs sustainably and prolong the sustained release time,which not only effectively reduce the toxicity of ACs,but also had positive effects on DS.

关 键 词：Allelochemicals(ACs) Sustained-release microspheres (SMs) Daphnia magna Straus(DS) 

分 类 号：X503[环境科学与工程—环境工程]