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https://doi.org/10.5194/bg-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  03 Apr 2020

03 Apr 2020

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This preprint is currently under review for the journal BG.

Alternation of heterotrophic bacterial and archaeal production along nitrogen and salinity gradients in coastal wetlands

Gema L. Batanero1, Andy J. Green2, Juan A. Amat2, Marion Vittecoq3,4, Curtis A. Suttle5, and Isabel Reche1,6 Gema L. Batanero et al.
  • 1Departamento de Ecología e Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
  • 2Departamento de Ecología de Humedales, Estación Biológica de Doñana, EBD-CSIC, 41092 Sevilla, Spain
  • 3Tour du Valat, Institut de Recherche pour la Conservation des Zones Humides Méditerranéennes, Arles, 13200, France
  • 4UMR MIVEGEC, IRD, CNRS, Université de Montpellier, Montpellier, France
  • 5Departments of Earth, Ocean & Atmospheric Sciences, Microbiology & Immunology, and Botany, and the Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC, V6T1Z4, Canada
  • 6Research Unit Modeling Nature (MNat), Universidad de Granada, 18071 Granada, Spain

Abstract. Coastal wetlands are valuable ecosystems with high biological productivity and diversity, which provide ecosystem services such as a reduction in the inputs of nitrogen into coastal waters, and storage of organic carbon, thus, acting as net carbon sinks. The rise of sea level as a consequence of climatic warming will salinize many coastal wetlands, but there is considerable uncertainty about how salinization will affect microbial communities and biogeochemical processes. We analyzed prokaryotic abundance and heterotrophic bacterial and archaeal production in 112 ponds within nine coastal wetlands from the western Mediterranean coast. We determined the main drivers of prokaryotic abundance and production in these wetlands using generalized linear models (GLMs). The best GLM, including all the coastal wetlands, indicated that the concentration of total dissolved nitrogen (TDN) positively affected the abundance of heterotrophic prokaryotes and heterotrophic archaeal production. In contrast, heterotrophic bacterial production was negatively related to TDN. This negative relationship appeared to be mediated by salinity and virus abundance. Heterotrophic bacterial production declined as salinity, and virus abundance, increased. We observed a switch from heterotrophic bacterial production towards heterotrophic archaeal production as salinity and virus abundance increased. Our results imply that microbial activity will change from bacterial-dominated processes to archaeal-dominated processes along with increases of nitrogen inputs and salinity. However, more studies are required to link the mineralization rates of dissolved nitrogen and organic carbon with specific archaeal taxa, to enable more accurate predictions on future scenarios of wetlands salinization and anthropogenic nitrogen inputs.

Gema L. Batanero et al.

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Gema L. Batanero et al.

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Short summary
Coastal wetlands provide ecosystem services such as a reduction in nitrogen inputs into coastal waters and storage organic carbon. The rise of sea level will salinize many coastal wetlands. Here, we analyzed the abundance of prokaryotes and the heterotrophic production of bacteria and archaea in wetlands from the Mediterranean coast. We observed a switch from bacterial-dominated production to archaeal-dominated production with increases of anthropogenic nitrogen inputs and salinity.
Coastal wetlands provide ecosystem services such as a reduction in nitrogen inputs into coastal...
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