Effects of allochthonous dissolved organic matter input on microbial composition and nitrogen cycling genes at two contrasting estuarine sites

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Happel , E M , Trine , M , Teikari , J E , Huchaiah , V , Alneberg , J , Andersson , A F , Sivonen , K , Middelboe , M , Kisand , V & Riemann , L 2019 , ' Effects of allochthonous dissolved organic matter input on microbial composition and nitrogen cycling genes at two contrasting estuarine sites ' , FEMS Microbiology Ecology , vol. 95 , no. 9 , 123 , pp. 1-10 . https://doi.org/10.1093/femsec/fiz123

Title: Effects of allochthonous dissolved organic matter input on microbial composition and nitrogen cycling genes at two contrasting estuarine sites
Author: Happel, Elisabeth M.; Trine, Markussen; Teikari, Jonna E.; Huchaiah, Vimala; Alneberg, Johannes; Andersson, Andres F.; Sivonen, Kaarina; Middelboe, Matthias; Kisand, Veljo; Riemann, Lasse
Contributor organization: Department of Microbiology
Helsinki Institute of Sustainability Science (HELSUS)
Cyanobacteria research
Date: 2019-09
Language: eng
Number of pages: 10
Belongs to series: FEMS Microbiology Ecology
ISSN: 0168-6496
DOI: https://doi.org/10.1093/femsec/fiz123
URI: http://hdl.handle.net/10138/318220
Abstract: Heterotrophic bacteria are important drivers of nitrogen (N) cycling and the processing of dissolved organic matter (DOM). Projected increases in precipitation will potentially cause increased loads of riverine DOM to the Baltic Sea and likely affect the composition and function of bacterioplankton communities. To investigate this, the effects of riverine DOM from two different catchment areas (agricultural and forest) on natural bacterioplankton assemblages from two contrasting sites in the Baltic Sea were examined. Two microcosm experiments were carried out, where the community composition (16S rRNA gene sequencing), the composition of a suite of N-cycling genes (metagenomics) and the abundance and transcription of ammonia monooxygenase (amoA) genes involved in nitrification (quantitative PCR) were investigated. The river water treatments evoked a significant response in bacterial growth, but the effects on overall community composition and the representation of N-cycling genes were limited. Instead, treatment effects were reflected in the prevalence of specific taxonomic families, specific N-related functions and in the transcription of amoA genes. The study suggests that bacterioplankton responses to changes in the DOM pool are constrained to part of the bacterial community, whereas most taxa remain relatively unaffected.
Subject: 1183 Plant biology, microbiology, virology
BACTERIOPLANKTON
Baltic Sea
Dissolved organic matter (DOM)
river
Nitrogen cycle
bacterioplankton
Baltic Sea
metagenomics
dissolved organic matter
river
nitrogen
BALTIC SEA
COMMUNITY COMPOSITION
BACTERIAL COMMUNITIES
WATER-COLUMN
RIVER PLUME
MARINE
BACTERIOPLANKTON
CARBON
DENITRIFICATION
EUTROPHICATION
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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