A new method to reconstruct quantitative food webs and nutrient flows from isotope tracer addition experiments

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dc.contributor.authorLópez-Sepulcre, Andrés
dc.contributor.authorBruneaux, Matthieu
dc.contributor.authorCollins, Sarah M.
dc.contributor.authorEl-Sabaawi, Rana
dc.contributor.authorFlecker, Alexander S.
dc.contributor.authorThomas, Steven A.
dc.date.accessioned2025-10-27T18:40:32Z
dc.date.available2025-10-27T18:40:32Z
dc.date.issued2020
dc.description.abstractUnderstanding how nutrients flow through food webs is central in ecosystem ecology. Tracer addition experiments are powerful tools to reconstruct nutrient flows by adding an isotopically enriched element into an ecosystem and tracking its fate through time. Historically, the design and analysis of tracer studies have varied widely, ranging from descriptive studies to modeling approaches of varying complexity. Increasingly, isotope tracer data are being used to compare ecosystems and analyze experimental manipulations. Currently, a formal statistical framework for analyzing such experiments is lacking, making it impossible to calculate the estimation errors associated with the model fit, the interdependence of compartments, and the uncertainty in the diet of consumers. In this article we develop a method based on Bayesian hidden Markov models and apply it to the analysis of 15 N ⁢‐NH4+ N15⁢‐NH4+ tracer additions in two Trinidadian streams in which light was experimentally manipulated. Through this case study, we illustrate how to estimate N fluxes between ecosystem compartments, turnover rates of N within those compartments, and the associated uncertainty. We also show how the method can be used to compare alternative models of food web structure, calculate the error around derived parameters, and make statistical comparisons between sites or treatments.
dc.description.reviewstatusReviewed
dc.description.scholarlevelFaculty
dc.description.sponsorshipFunding was provided by grants from the Academy of Finland (295941) to A.L.-S. and a Frontiers in Integrative Biological Research (FIBR) grant from the National Science Foundation (EF0623632) to A.S.F. and S.A.T.
dc.identifier.citationLópez-Sepulcre, A., Bruneaux, M., Collins, S. M., El-Sabaawi, R., Flecker, A. S., & Thomas, S. A. (2020). A new method to reconstruct quantitative food webs and nutrient flows from isotope tracer addition experiments. The American Naturalist, 195(6), 964–985. https://doi.org/10.1086/708546
dc.identifier.urihttps://doi.org/10.1086/708546
dc.identifier.urihttps://hdl.handle.net/1828/22878
dc.language.isoen
dc.publisherThe American Naturalist
dc.subjectfood webs
dc.subjecthidden Markov model (HMM)
dc.subjectisotope tracer addition
dc.subjectmodel selection
dc.subjectnutrient uptake
dc.subjectstate-space models
dc.subject.departmentDepartment of Biology
dc.titleA new method to reconstruct quantitative food webs and nutrient flows from isotope tracer addition experiments
dc.typeArticle

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