Combined Effects of Warming,Eutrophication and Herbicide Pollution on Zooplankton Communities
Zooplankton play a key role in aquatic ecosystems,and high sensitivity to environmental changes makes zooplankton an important indicator of water quality.In this study,we explored the re-sponse of the zooplankton community to multiple stressors in shallow lakes using an outdoor meso-cosm simulation experiment,aiming to provide guidance and insight for environmental monitoring and conservation.The experiment was conducted from June to November of 2020,and mesocosm simulation experiment was set under the stresses of climate warming,eutrophication(nutrient enrich-ment),and herbicide(glyphosate)pollution,singly and in combination.A total of 12 treatments with 4 replicates were designed,and at the end of experiment,water environmental parameters and zoo-plankton community structure and functional groups were determined for each treatment.A total of 72 zooplankton species were identified in the mesocosms,including 21 protozoans(14 genera),30 ro-tifers(17 genera),13 cladocerans(11 genera),and 8 copepods(7 genera).The abundance and bio-mass of rotifers and of total zooplankton were reduced by warming,and eutrophication increased the abundance and biomass of cladocera and total zooplankton.Warming increased the Shannon-Wiener diversity and Pielou evenness indices of the zooplankton community,whereas glyphosate decreased the diversity and evenness indices.The dominant functional groups in the mesocosms included proto-zoan algivores(PA),protozoan algivores and bacterivores(PA/PB),rotifer filter feeders(RF),rotifer predators(RP),rotifer suckers(RS),small copepods and cladocera filter feeders(SCF)and large co-pepods and cladocera filter feeders(LCF).Warming and eutrophication were found to be the impor-tant factors affecting the composition of zooplankton functional groups.The interaction of continuous warming and glyphosate mitigated the inhibition of warming on rotifers.However,the combined ef-fects of eutrophication and warming with multiple heatwaves reduced the dominance of the dominant functional group PA/PB.The interactions among stressors increased the complexity of predicting wa-ter quality and zooplankton community structure in aquatic ecosystems under future climate change scenarios.
万方数据
维普
