Labile and recalcitrant organic matter utilization by river biofilm under increasing water temperature.

Microbial Ecology
Irene YllaSergi Sabater

Abstract

Microbial biofilms in rivers contribute to the decomposition of the available organic matter which typically shows changes in composition and bioavailability due to their origin, seasonality, and watershed characteristics. In the context of global warming, enhanced biofilm organic matter decomposition would be expected but this effect could be specific when either a labile or a recalcitrant organic matter source would be available. A laboratory experiment was performed to mimic the effect of the predicted increase in river water temperature (+4 °C above an ambient temperature) on the microbial biofilm under differential organic matter sources. The biofilm microbial community responded to higher water temperature by increasing bacterial cell number, respiratory activity (electron transport system) and microbial extracellular enzymes (extracellular enzyme activity). At higher temperature, the phenol oxidase enzyme explained a large fraction of respiratory activity variation suggesting an enhanced microbial use of degradation products from humic substances. The decomposition of hemicellulose (β-xylosidase activity) seemed to be also favored by warmer conditions. However, at ambient temperature, the enzymes highly responsible for r...Continue Reading

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Citations

Mar 11, 2016·Microbial Ecology·Yuki TsuchiyaHisao Morisaki
Jun 8, 2015·Environmental Science and Pollution Research International·Alessandra Emanuele ToniettoArmando Augusto Henriques Vieira
Mar 19, 2014·Microbial Ecology·Irene YllaAnna M Romaní
May 26, 2017·The Science of the Total Environment·Aingeru MartínezAitor Larrañaga
Sep 20, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Wei CaiChao Wang
Apr 15, 2019·Environmental Science and Pollution Research International·Jie XieQitang Wu
Nov 5, 2019·Scientific Reports·Ferran RomeroSergi Sabater
Jul 19, 2020·Environmental Science and Pollution Research International·Peter McClean, William Ross Hunter
Oct 20, 2020·Frontiers in Microbiology·Lina AllessonDag O Hessen
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Natalia A Kulikova, Irina V Perminova

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