The relevance of environment vs. composition on dissolved organic matter degradation in freshwaters

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  • Núria Catalán, Catalan Institute for Water Research, University of Girona, United States Geological Survey, Universite Paris-Saclay
  • ,
  • Ada Pastor
  • Carles M. Borrego, Catalan Institute for Water Research, University of Girona
  • ,
  • Joan Pere Casas-Ruiz, Catalan Institute for Water Research, University of Girona
  • ,
  • Carmen Gutiérrez, Catalan Institute for Water Research, University of Girona
  • ,
  • Daniel von Schiller, University of Barcelona
  • ,
  • Rafael Marcé, Catalan Institute for Water Research, University of Girona

Dissolved organic matter (DOM) composition exerts a direct control on its degradation and subsequent persistence in aquatic ecosystems. Yet, under certain conditions, the degradation patterns of DOM cannot be solely explained by its composition, highlighting the relevance of environmental conditions for DOM degradation. Here, we experimentally assessed the relative influence of composition vs. environment on DOM degradation by performing degradation bioassays using three contrasting DOM sources inoculated with a standardized bacterial inoculum under five distinct environments. The DOM degradation kinetics modeled using reactivity continuum models showed that composition was more important than environment in determining the bulk DOM decay patterns. Changes in DOM composition resulted from the interaction between DOM source and environment. The role of environment was stronger on shaping the bacterial community composition, but the intrinsic nature of the DOM source exerted stronger control on the DOM degradation function.

OriginalsprogEngelsk
TidsskriftLimnology and Oceanography
Vol/bind66
Nummer2
Sider (fra-til)306-320
Antal sider15
ISSN0024-3590
DOI
StatusUdgivet - feb. 2021

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