The riverine bioreactor: An integrative perspective on biological decomposition of organic matter across riverine habitats

Ignacio Peralta-Maraver, Rachel Stubbington, Shai Arnon, Pavel Kratina, Stefan Krause, Vivian de Mello Cionek, Nei Kavaguichi Leite, Aurea Luiza Lemes da Silva, Sidinei Magela Thomaz, Malte Posselt, Victoria Susan Milner, Andrea Momblanch, Marcelo S. Moretti, Rodolfo L.B. Nóbrega, Daniel M. Perkins, Mauricio M. Petrucio, Isabel Reche, Victor Saito, Hugo Sarmento, Emily StrangeRicardo Hideo Taniwaki, James White, Gustavo Henrique Zaia Alves, Anne L. Robertson

Research output: Contribution to journalReview articlepeer-review

Abstract

Riverine ecosystems can be conceptualized as ‘bioreactors’ (the riverine bioreactor) which retain and decompose a wide range of organic substrates. The metabolic performance of the riverine bioreactor is linked to their community structure, the efficiency of energy transfer along food chains, and complex interactions among biotic and abiotic environmental factors. However, our understanding of the mechanistic functioning and capacity of the riverine bioreactor remains limited. We review the state of knowledge and outline major gaps in the understanding of biotic drivers of organic matter decomposition processes that occur in riverine ecosystems, across habitats, temporal dimensions, and latitudes influenced by climate change. We propose a novel, integrative analytical perspective to assess and predict decomposition processes in riverine ecosystems. We then use this model to analyse data to demonstrate that the size-spectra of a community can be used to predict decomposition rates by analysing an illustrative dataset. This modelling methodology allows comparison of the riverine bioreactor's performance across habitats and at a global scale. Our integrative analytical approach can be applied to advance understanding of the functioning and efficiency of the riverine bioreactor as hotspots of metabolic activity. Application of insights gained from such analyses could inform the development of strategies that promote the functioning of the riverine bioreactor across global ecosystems.

Original languageEnglish
Article number145494
Number of pages12
JournalScience of the Total Environment
Volume772
Early online date1 Feb 2021
DOIs
Publication statusPublished - 10 Jun 2021

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