The primacy of quantity over quality determining autochthony in freshwater food webs

The primacy of quantity over quality determining autochthony in freshwater food webs | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 2 January 2025 V1 Latest version Share on The primacy of quantity over quality determining autochthony in freshwater food webs Authors : Juliana S. Leal 0000-0002-7636-3508 [email protected] , Angélica González 0000-0002-4636-6329 , Natália Freitas de Souza , Lúcia Fernandes Sanches , and Vinicius Farjalla Authors Info & Affiliations https://doi.org/10.22541/au.173582710.06604462/v1 224 views 136 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract In freshwater food webs, consumers often prefer high-quality autochthonous OM over allochthonous OM. However, scarcity may force reliance on the abundant but lower-quality allochthonous OM. We examined how the dietary contribution of autochthonous OM varied with its in-habitat quantity. We manipulated light incidence over natural ecosystems to create a gradient of autochthonous OM quantity. We tested whether autochthonous OM contributed proportionally its quantity to consumer diets or was preferentially foraged. Autochthonous OM contributed more to diets when scarce but stabilized at a limit despite further increases, indicating a minimum quantity to trigger an autochthonous-based energy pathway and a saturation point. Light incidence and periphyton phosphorus, proxies for OM quantity and quality, positively influenced dietary contributions, while its interaction with chlorophyll-a negatively affected it---likely by reducing OM quality or quantity. We concluded that OM quantity and quality shape energy pathways in freshwater food webs, with quantity as the primary driver. Type of Article: Letter Title: The primacy of quantity over quality determining autochthony in freshwater food webs Running Title: Quantity over quality shapes autochthony Authors : Juliana S. Leal 1* , Angélica L. González 2 , Natália F. Souza 1 , Lúcia F. Sanches 1 , Vinicius F. Farjalla 1,3 Affiliations 1 – Programa de Pós-Graduação em Ecologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil. 2 – Department of Biology and Center for Computational and Integrative Biology, Rutgers, The State University of New Jersey, Camden, New Jersey, United States. 3 – Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil. E-mail Addresses JSL (*corresponding author) - [email protected] ALG - [email protected] NFS - [email protected] LFS - [email protected] VFF - [email protected] Statement of Authorship All authors agree to submit the manuscript, and each carries a degree of responsibility for the accuracy, integrity, and ethics of this study and the work described therein. Author Contributions JSL - Conceptualization, Methodology, Data Collection and Analysis, Visualization, and Writing (Original Draft) ALG - Conceptualization, Methodology, Data Collection and Analysis, Writing (Review and Editing), Funding Acquisition, and Supervision NFS - Data Analysis, Visualization, and Writing (Original Draft) LFS - Methodology, Data Collection, and Writing (Review and Editing) VFF - Conceptualization, Methodology, Data Collection and Analysis, Writing (Review and Editing), Funding Acquisition, and Supervision Keywords: Energy pathways; allochthonous; stable isotope analysis; Bayesian isotope mixing model; natural microcosms; tank bromeliads. Number of Words Abstract: 150 Main text: 4,985 Number of References: 52 Number of Figures: 3 Number of Tables: 1 Data Accessibility Statement The data of the stable isotope analyses and code for running the Bayesian stable isotope mixing model are presented in the Supporting Information section. The data and R code for the other analyses are available at the following DOI: 10.6084/m9.figshare.28054433 Supplementary Material File (abstract page.docx) Download 14.20 KB File (appendix.docx) Download 2.45 MB File (main text.docx) Download 1.90 MB File (supporting information.docx) Download 14.38 MB Information & Authors Information Version history V1 Version 1 02 January 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords allochthonous bayesian isotope mixing model energy pathways natural microcosms stable isotope analysis tank bromeliads Authors Affiliations Juliana S. Leal 0000-0002-7636-3508 [email protected] UFRJ View all articles by this author Angélica González 0000-0002-4636-6329 Rutgers University Camden View all articles by this author Natália Freitas de Souza View all articles by this author Lúcia Fernandes Sanches View all articles by this author Vinicius Farjalla Federal University of Rio de Janeiro View all articles by this author Metrics & Citations Metrics Article Usage 224 views 136 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Juliana S. Leal, Angélica González, Natália Freitas de Souza, et al. The primacy of quantity over quality determining autochthony in freshwater food webs. Authorea . 02 January 2025. DOI: https://doi.org/10.22541/au.173582710.06604462/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. 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