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Metaecosystem dynamics drive community composition in experimental multilayered spatial networks

View ORCID ProfileEric Harvey, View ORCID ProfileIsabelle Gounand, View ORCID ProfileEmanuel A. Fronhofer, View ORCID ProfileFlorian Altermatt
doi: https://doi.org/10.1101/675256
Eric Harvey
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
3Département de Sciences Biologiques, Université de Montréal, Canada
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  • For correspondence: eric.harvey@umontreal.ca
Isabelle Gounand
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
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Emanuel A. Fronhofer
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
4ISEM, Université de Montpellier, CNRS, IRD, EDPHE, Montpellier, France
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Florian Altermatt
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
2Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Aquatic Ecology, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
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Abstract

Cross-ecosystem subsidies are studied with a focus on resource exchange at local ecosystem boundaries. This perspective ignores regional dynamics that can emerge via constraints imposed by the landscape, potentially leading to spatially-dependent effects of subsidies and spatial feedbacks. Using miniaturized landscape analogues of river dendritic and terrestrial lattice spatial networks, we manipulated and studied resource exchange between the two whole networks. We found that community composition in dendritic networks depended on the resource pulse from the lattice network, with the strength of this effect declining in larger downstream patches. In turn, this spatially-dependent effect imposed constraints on the lattice network with populations in that network reaching higher densities when connected to more central patches in the dendritic network. Consequently, localized cross-ecosystem fluxes, and their respective effects on recipient ecosystems, must be studied in a perspective taking into account the explicit spatial configuration of the landscape.

Statement of authorship EH, IG, EAF and FA designed the research; EH conducted the lab experiment with support from IG, EAF and FA, processed the experimental data with methodological developments from IG, and carried out the analysis of experimental data; all authors participated in results interpretation; EH wrote the first draft of the manuscript; All authors significantly contributed to further manuscript revisions.

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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 4.0 International license.
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Posted June 19, 2019.
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Metaecosystem dynamics drive community composition in experimental multilayered spatial networks
Eric Harvey, Isabelle Gounand, Emanuel A. Fronhofer, Florian Altermatt
bioRxiv 675256; doi: https://doi.org/10.1101/675256
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Metaecosystem dynamics drive community composition in experimental multilayered spatial networks
Eric Harvey, Isabelle Gounand, Emanuel A. Fronhofer, Florian Altermatt
bioRxiv 675256; doi: https://doi.org/10.1101/675256

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