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Stoichiometric constraints modulate the effects of temperature and nutrients on biomass distribution and community stability

View ORCID ProfileArnaud Sentis, Bart Haegeman, José M. Montoya
doi: https://doi.org/10.1101/589895
Arnaud Sentis
1Centre for Biodiversity Theory and Modelling, Theoretical and Experimental Ecology Station, CNRS and Paul Sabatier University, Moulis, France
2INRAE, Aix Marseille Univ., UMR RECOVER, 3275 route Cézanne, 13182 Aix-en-Provence, France
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  • For correspondence: Arnaud.sentis@inrae.fr
Bart Haegeman
1Centre for Biodiversity Theory and Modelling, Theoretical and Experimental Ecology Station, CNRS and Paul Sabatier University, Moulis, France
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José M. Montoya
1Centre for Biodiversity Theory and Modelling, Theoretical and Experimental Ecology Station, CNRS and Paul Sabatier University, Moulis, France
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ABSTRACT

Temperature and nutrients are two of the most important drivers of global change. Both can modify the elemental composition (i.e. stoichiometry) of primary producers and consumers. Yet their combined effect on the stoichiometry, dynamics, and stability of ecological communities remains largely unexplored. To fill this gap, we extended the Rosenzweig-MacArthur consumer-resource model by including thermal dependencies, nutrient dynamics, and stoichiometric constraints on both the primary producer and the consumer. We found that stoichiometric constraints dampen the paradox of enrichment and increased persistence at high nutrient levels. Nevertheless, they also reduced consumer persistence at extreme temperatures. Finally, we also found that stoichiometric constraints can strongly influence biomass distribution across trophic levels by modulating consumer assimilation efficiency and resource growth rates along the environmental gradients. In the Rosenzweig-MacArthur model, consumer biomass exceeded resource biomass for most parameter values whereas, in the stoichiometric model, consumer biomass was strongly reduced and sometimes lower than resource biomass. Our findings highlight the importance of accounting for stoichiometric constraints as they can mediate the temperature and nutrient impact on the dynamics and functioning of ecological communities.

Footnotes

  • https://doi.org/10.5061/dryad.msbcc2fv2

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 28, 2020.
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Stoichiometric constraints modulate the effects of temperature and nutrients on biomass distribution and community stability
Arnaud Sentis, Bart Haegeman, José M. Montoya
bioRxiv 589895; doi: https://doi.org/10.1101/589895
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Stoichiometric constraints modulate the effects of temperature and nutrients on biomass distribution and community stability
Arnaud Sentis, Bart Haegeman, José M. Montoya
bioRxiv 589895; doi: https://doi.org/10.1101/589895

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