Changes in macrofauna bioturbation during repeated heatwaves mediate changes in biogeochemical cycling of nutrients

Type Article
Date 2023-01
Language English
Author(s) Kauppi Laura1, 2, Göbeler Norman1, 2, Norkko Joanna1, 2, Norkko Alf1, 2, Romero-Ramirez Alicia3, Bernard Guillaume3, 4
Affiliation(s) 1 : Tvärminne Zoological Station, University of Helsinki, Hanko, Finland
2 : Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
3 : Station Marine d’Arcachon, UMR CNRS 5805 EPOC—OASU Université de Bordeaux, Arcachon, France
4 : IFREMER, Department of Oceanography and Ecosystem Dynamics (ODE), Littoral unit, LERAR, Littoral, Arcachon, France
Source Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2023-01 , Vol. 9 , P. 1070377 (13p.)
DOI 10.3389/fmars.2022.1070377
WOS© Times Cited 1
Keyword(s) benthic macrofauna, bioturbation, ecosystem functioning, soft sediment, Baltic Sea, climate change
Abstract

The increasing frequency and intensity of marine heatwaves (MHWs) observed worldwide entails changes in the structure and functioning of ecological communities. While severe and extreme heatwaves often have more destructive effects, the more subtle effects of moderate and strong heatwaves may nevertheless affect ecosystem functioning through complex, context-dependent linkages between different processes. Here we conducted a laboratory experiment to study the effects of repeated short-term, strong MHWs on macrofauna bioturbation and associated solute fluxes as a measure of ecosystem functioning using natural soft-sediment communities from the Baltic Sea. Our results showed changes in both bioturbation and biogeochemical cycling of nutrients following short-term, strong heatwaves, which seemed to contribute to an enhanced degradation of organic matter in the seafloor and an enhanced exchange of solutes across the sediment-water interface as well as increased sediment oxygen consumption. Following changes in these processes, the relative contribution of macrofauna and the environmental context to ecosystem functioning was altered. Our results highlight the potential of even shorter-term, strong MHWs of having system-wide impacts due to changes in the mechanistic process of bioturbation underpinning the biogeochemical cycling of nutrients. This study also highlights the need to measure a wide range of variables for a comprehensive understanding of the changes in functioning under disturbances, such as MHWs.

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How to cite 

Kauppi Laura, Göbeler Norman, Norkko Joanna, Norkko Alf, Romero-Ramirez Alicia, Bernard Guillaume (2023). Changes in macrofauna bioturbation during repeated heatwaves mediate changes in biogeochemical cycling of nutrients. Frontiers In Marine Science, 9, 1070377 (13p.). Publisher's official version : https://doi.org/10.3389/fmars.2022.1070377 , Open Access version : https://archimer.ifremer.fr/doc/00816/92822/