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Litter Quality Modulates Effects of Dissolved Nitrogen on Leaf Decomposition by Stream Microbial Communities

  • Environmental Microbiology
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Abstract

Rates of leaf litter decomposition in streams are strongly influenced both by inorganic nutrients dissolved in stream water and by litter traits such as lignin, nitrogen (N) and phosphorus (P) concentrations. As a result, decomposition rates of different leaf species can show contrasting responses to stream nutrient enrichment resulting from human activities. It is unclear, however, whether the root cause of such discrepancies in field observations is the interspecific variation in either litter nutrient or litter lignin concentrations. To address this question, we conducted a controlled laboratory experiment with a known fungal community to determine decomposition rates of 38 leaf species exhibiting contrasting litter traits (N, P and lignin concentrations), which were exposed to 8 levels of dissolved N concentrations representative of field conditions across European streams (0.07 to 8.96 mg N L−1). The effect of N enrichment on decomposition rate was modelled using Monod kinetics to quantify N effects across litter species. Lignin concentration was the most important litter trait determining decomposition rates and their response to N enrichment. In particular, increasing dissolved N supply from 0.1 to 3.0 mg N L−1 accelerated the decomposition of lignin-poor litter (e.g. < 10% of lignin, 2.9× increase ± 1.4 SD, n = 14) more strongly than that of litter rich in lignin (e.g. > 15% of lignin, 1.4× increase ± 0.2 SD, n = 9). Litter nutrient concentrations were less important, with a slight positive effect of P on decomposition rates and no effect of litter N. These results indicate that shifts in riparian vegetation towards species characterized by high litter lignin concentrations could alleviate the stimulation of C turnover by stream nutrient enrichment.

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Acknowledgments

The authors are grateful to Frédéric Julien and Wendy Amblas for litter CNP analyses.

Funding

This study is part of the FunctionalStreams project funded by the French National Research Agency (grant ANR-14-CE01-0009-01).

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Authors and Affiliations

  1. EcoLab, Université de Toulouse, CNRS, INP, UPS, 118 route de Narbonne, Bât 4R1, Toulouse cedex 9, 31062, France

    Jérémy Jabiol, Antoine Lecerf, Sylvain Lamothe & Eric Chauvet

  2. LIEC-Laboratoire Interdisciplinaire des Environnements Continentaux, Université de Lorraine, UMR 7360, Avenue du Général Delestraint, 57070, Metz, France

    Jérémy Jabiol

  3. Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Alte Fischerhütte 2, 16775, Stechlin, Germany

    Mark O. Gessner

  4. Department of Ecology, Berlin Institute of Technology (TU Berlin), Ernst-Reuter-Platz 1, 10587, Berlin, Germany

    Mark O. Gessner

Authors
  1. Jérémy Jabiol
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  2. Antoine Lecerf
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  4. Mark O. Gessner
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Correspondence to Jérémy Jabiol.

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Jabiol, J., Lecerf, A., Lamothe, S. et al. Litter Quality Modulates Effects of Dissolved Nitrogen on Leaf Decomposition by Stream Microbial Communities. Microb Ecol 77, 959–966 (2019). https://doi.org/10.1007/s00248-019-01353-3

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  • DOI: https://doi.org/10.1007/s00248-019-01353-3

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