Effects of damming, seasonality and different environments on reservoir phytoplankton

Effects of damming, seasonality and different environments on reservoir phytoplankton | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Effects of damming, seasonality and different environments on reservoir phytoplankton Luana Silva Castro, Idelina Gomes Silva, Bárbara Dunck This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4638292/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 26 Jun, 2025 Read the published version in Aquatic Sciences → Version 1 posted 10 You are reading this latest preprint version Abstract Reservoirs transform the physical, biological and chemical characteristics of rivers, altering their flow dynamics and the availability of nutrients. After a river is dammed, the species composition in the reservoir and its tributaries tend to change in response to the new conditions which are generated. This work investigates the tributary rivers and sites along the main channel of the Tocantins River’s middle course. The study was conducted between 2009 and 2013 in the pre- and post-dam periods to evaluate the effects of the dam on phytoplankton. The area of study was located along the middle course of the Tocantins River, where the Estreito hydroelectric power plant is found. The variables of ammonium, nitrate and inorganic phosphorous were those that most contributed to the environmental variation post-damming. The richness in classes of phytoplankton was higher during the pre-dam period, the dry season, and in the environment of the river’s main channel. The classes which stood out the most were Bacillariophyceae, Chlorophyceae and Cyanophyceae. We verified that damming the Tocantins River negatively affected the phytoplankton communities, reducing their richness and density in the post-dam period. The results showed that the species with the largest contributions to beta diversity were found to be the most common and abundant ones, suggesting that the damming of the Tocantins River has led to the loss of sensitive and specialist species. Beta diversity pre- and post-dam periods Tocantins River tributaries Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 26 Jun, 2025 Read the published version in Aquatic Sciences → Version 1 posted Editorial decision: Revision requested 26 Aug, 2024 Reviews received at journal 06 Aug, 2024 Reviewers agreed at journal 01 Aug, 2024 Reviewers agreed at journal 30 Jul, 2024 Reviews received at journal 16 Jul, 2024 Reviewers agreed at journal 01 Jul, 2024 Reviewers invited by journal 28 Jun, 2024 Editor assigned by journal 27 Jun, 2024 Submission checks completed at journal 26 Jun, 2024 First submitted to journal 25 Jun, 2024 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4638292","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":327901518,"identity":"ee22a8df-535d-4d99-bc6e-87047b0161ea","order_by":0,"name":"Luana Silva Castro","email":"data:image/png;base64,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","orcid":"","institution":"Universidade Federal do Pará","correspondingAuthor":true,"prefix":"","firstName":"Luana","middleName":"Silva","lastName":"Castro","suffix":""},{"id":327901519,"identity":"aa7d6776-2b0d-4073-adac-d3c37b1efa5b","order_by":1,"name":"Idelina Gomes Silva","email":"","orcid":"","institution":"Universidade Federal do Pará","correspondingAuthor":false,"prefix":"","firstName":"Idelina","middleName":"Gomes","lastName":"Silva","suffix":""},{"id":327901520,"identity":"550c7b02-f264-4983-86ab-c0279f474ffd","order_by":2,"name":"Bárbara Dunck","email":"","orcid":"","institution":"Universidade Federal Rural da Amazônia","correspondingAuthor":false,"prefix":"","firstName":"Bárbara","middleName":"","lastName":"Dunck","suffix":""}],"badges":[],"createdAt":"2024-06-25 18:33:10","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4638292/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4638292/v1","draftVersion":[],"editorialEvents":[{"content":"https://doi.org/10.1007/s00027-025-01202-1","type":"published","date":"2025-06-26T16:05:41+00:00"}],"editorialNote":"","failedWorkflow":false,"files":[{"id":85686511,"identity":"d1035515-6932-4b38-9ec7-edc940cd722a","added_by":"auto","created_at":"2025-06-30 16:08:11","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1054364,"visible":true,"origin":"","legend":"","description":"","filename":"Castroetal2024.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4638292/v1_covered_e9568d6b-b0e8-4132-896c-b257f1204b30.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Effects of damming, seasonality and different environments on reservoir phytoplankton","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"aquatic-sciences","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"aqsc","sideBox":"Learn more about [Aquatic Sciences](http://link.springer.com/journal/27)","snPcode":"27","submissionUrl":"https://submission.nature.com/new-submission/27/3","title":"Aquatic Sciences","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Beta diversity, pre- and post-dam periods, Tocantins River, tributaries","lastPublishedDoi":"10.21203/rs.3.rs-4638292/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4638292/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eReservoirs transform the physical, biological and chemical characteristics of rivers, altering their flow dynamics and the availability of nutrients. After a river is dammed, the species composition in the reservoir and its tributaries tend to change in response to the new conditions which are generated. This work investigates the tributary rivers and sites along the main channel of the Tocantins River\u0026rsquo;s middle course. The study was conducted between 2009 and 2013 in the pre- and post-dam periods to evaluate the effects of the dam on phytoplankton. The area of study was located along the middle course of the Tocantins River, where the Estreito hydroelectric power plant is found. The variables of ammonium, nitrate and inorganic phosphorous were those that most contributed to the environmental variation post-damming. The richness in classes of phytoplankton was higher during the pre-dam period, the dry season, and in the environment of the river\u0026rsquo;s main channel. The classes which stood out the most were Bacillariophyceae, Chlorophyceae and Cyanophyceae. 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