Responses of stream microbes to multiple anthropogenic stressors in a mesocosm study

The Science of the Total Environment
Julia K NuyJens Boenigk

Abstract

Stream ecosystems are affected by multiple anthropogenic stressors worldwide. Even though effects of many single stressors are comparatively well studied, the effects of multiple stressors are difficult to predict. In particular bacteria and protists, which are responsible for the majority of ecosystem respiration and element flows, are infrequently studied with respect to multiple stressors responses. We conducted a stream mesocosm experiment to characterize the responses of single and multiple stressors on microbiota. Two functionally important stream habitats, leaf litter and benthic phototrophic rock biofilms, were exposed to three stressors in a full factorial design: fine sediment deposition, increased chloride concentration (salinization) and reduced flow velocity. We analyzed the microbial composition in the two habitat types of the mesocosms using an amplicon sequencing approach. Community analysis on different taxonomic levels as well as principle component analyses (PCoAs) based on realtive abundances of operational taxonomic units (OTUs) showed treatment specific shifts in the eukaryotic biofilm community. Analysis of variance (ANOVA) revealed that Bacillariophyta responded positively salinity and sediment increase,...Continue Reading

Citations

Apr 5, 2020·Applied and Environmental Microbiology·Ferran RomeroSergi Sabater
Aug 6, 2020·Ecological Applications : a Publication of the Ecological Society of America·Noël P D Juvigny-KhenafouChristoph D Matthaei
Oct 10, 2021·Biological Reviews of the Cambridge Philosophical Society·Cátia VenâncioIsabel Lopes

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