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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

Assessing the aquatic metabolic-balance response to future condition in a Mediterranean site: from an experimental-design perspective

Ismael L. Lozano https://orcid.org/0000-0002-4507-2564 A B *
+ Author Affiliations
- Author Affiliations

A Department of Forest Sciences, University of Helsinki, FI-00014, Helsinki, Finland.

B Institute for Atmospheric and Earth System Research, University of Helsinki, FI-00014, Helsinki, Finland.

* Correspondence to: ismael.lozano@helsinki.fi

Handling Editor: Iwan Jones

Marine and Freshwater Research 75, MF23137 https://doi.org/10.1071/MF23137
Submitted: 21 July 2023  Accepted: 2 May 2024  Published: 31 May 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Metabolic balance determines whether an ecosystem acts as a source or sink of carbon dioxide (CO2) and considering that a substantial portion of inland aquatic ecosystems act as a source of CO2 to the atmosphere, it is important to highlight that there is still no agreement on how global change will affect the ecosystem metabolic-balance response. It then becomes more important to study the interactions between global-change drivers and aquatic metabolism.

Aims

Assess possible shifts in ecosystem metabolic balance owing to global-change factors.

Methods

Collapsed factorial designs and novel experimental units have been used to study responses to future conditions.

Key results

In the study site, bacterial production was not affected by an increased temperature alone; however, increased nutrient availability may unmask UV or CO2 as a source of stress to bacteria. A synergistic effect between temperature and the combined effect of nutrients and CO2 on primary producers was also found.

Conclusions

In future scenarios, some heterotrophic inland water ecosystems may shift from heterotrophic to autotrophic states and therefore act as CO2 sinks.

Implications

This study provides a framework to support a deepening of knowledge on this topic.

Keywords: aquatic ecosystem modelling, bacterial production, climate change, ecosystem respiration, experimental units design, factorial collapsed design, metabolic balance, primary production.

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