Feasting on terrestrial organic matter: Dining in a dark lake changes microbial decomposition

Global Change Biology
Amelia FitchAndrew J Tanentzap

Abstract

Boreal lakes are major components of the global carbon cycle, partly because of sediment-bound heterotrophic microorganisms that decompose within-lake and terrestrially derived organic matter (t-OM). The ability for sediment bacteria to break down and alter t-OM may depend on environmental characteristics and community composition. However, the connection between these two potential drivers of decomposition is poorly understood. We tested how bacterial activity changed along experimental gradients in the quality and quantity of t-OM inputs into littoral sediments of two small boreal lakes, a dark and a clear lake, and measured the abundance of operational taxonomic units and functional genes to identify mechanisms underlying bacterial responses. We found that bacterial production (BP) decreased across lakes with aromatic dissolved organic matter (DOM) in sediment pore water, but the process underlying this pattern differed between lakes. Bacteria in the dark lake invested in the energetically costly production of extracellular enzymes as aromatic DOM increased in availability in the sediments. By contrast, bacteria in the clear lake may have lacked the nutrients and/or genetic potential to degrade aromatic DOM and instead miner...Continue Reading

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Citations

Nov 20, 2019·Proceedings of the National Academy of Sciences of the United States of America·Andrew J TanentzapThorsten Dittmar
May 15, 2021·Scientific Reports·Brice K GrunertPeter Hernes

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Datasets Mentioned

BETA
ERP019980

Methods Mentioned

BETA
chip

Software Mentioned

Trimmomatic
InterProScan
QIIME
SeqPrep
Biopython
R package vegan
FragGeneScan
perMANOVA
R package lmerTest
lme4

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