Modelling Trichodesmium photophysiology in theGreat Barrier Reef using the eReefs models

Modelling Trichodesmium photophysiology in theGreat Barrier Reef using the eReefs models | 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 Article Modelling Trichodesmium photophysiology in theGreat Barrier Reef using the eReefs models Chinenye Jane Ani, Mark Baird, Barbara Jane Robson This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6851179/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The nitrogen-fixing cyanobacterium, Trichodesmium, is proposed to be a major source of nitrogen in the Great Barrier Reef(GBR). Effective GBR water quality management requires an understanding of the contribution of Trichodesmium to the total annual nitrogen budget of the GBR. Reliable model simulations of Trichodesmium growth, nitrogen fixation and distribution are required to understand the dynamics of Trichodesmium in the GBR ecosystem. The variation of the major light-harvesting Trichodesmium phycobilipigments (phycourobilin (PUB) and phycoerythrobilin (PEB)) under varying light conditions was incorporated into the Trichodesmium growth submodel of the eReefs biogeochemical model. This involved parameterising the interconversion between PUB and PEB, and the photosystem II reaction centre dynamics. Our model formulations provide parameterisations of Trichodesmium photophysiology and can help to improve the understanding of Trichodesmium dynamics in the GBR. Earth and environmental sciences/Biogeochemistry Earth and environmental sciences/Ocean sciences/Marine biology Full Text Additional Declarations No competing interests reported. Supplementary Files supplementary.pdf Cite Share Download PDF Status: Posted Version 1 posted 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. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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-6851179","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":482281156,"identity":"170ec5ec-d455-4704-b0b0-266855d42335","order_by":0,"name":"Chinenye Jane Ani","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAxUlEQVRIiWNgGAWjYLCChAoGHlK1nCFZC2MbKar5G5ifPXg4z05Gt/8A84uPbQzyBgcIaJE4wGZukLgtmcfsRgKb5cw2BsMNhLQYMDCYSSRuYwZqYWAz5jnDwEiEFvZvEolz6nnMzh8Aa7EnQgsP0JaGwzxmBxKYH/NUMCQS1CJxmKdMIuHYcaDDEtsYZ1RIJM8kpIW/vX2b5I+aanuz84cPf/hgYGPbR0gLAzOcxdgmAbSVkHo03R9IUz8KRsEoGAUjBQAAoxI6vHI3+V4AAAAASUVORK5CYII=","orcid":"","institution":"Australian Institute of Marine Science","correspondingAuthor":true,"prefix":"","firstName":"Chinenye","middleName":"Jane","lastName":"Ani","suffix":""},{"id":482281157,"identity":"a35707a1-786f-40b3-ad66-67c657f105c7","order_by":1,"name":"Mark Baird","email":"","orcid":"","institution":"CSIRO Oceans and Atmosphere","correspondingAuthor":false,"prefix":"","firstName":"Mark","middleName":"","lastName":"Baird","suffix":""},{"id":482281158,"identity":"ac6c67ac-8511-4e86-887b-4cc500b9e960","order_by":2,"name":"Barbara Jane Robson","email":"","orcid":"","institution":"Australian Institute of Marine Science","correspondingAuthor":false,"prefix":"","firstName":"Barbara","middleName":"Jane","lastName":"Robson","suffix":""}],"badges":[],"createdAt":"2025-06-09 06:23:15","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-6851179/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-6851179/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":87807522,"identity":"0a19c719-4527-4253-b8f6-75020af99448","added_by":"auto","created_at":"2025-07-29 08:47:44","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":3803281,"visible":true,"origin":"","legend":"","description":"","filename":"Trichophotophysiologyscientificreports.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6851179/v1_covered_0326c035-4828-45ce-a05b-8edebeb25e77.pdf"},{"id":86467392,"identity":"bae95483-faec-46f3-8da4-a08223749101","added_by":"auto","created_at":"2025-07-11 03:56:16","extension":"pdf","order_by":0,"title":"","display":"","copyAsset":false,"role":"supplement","size":298943,"visible":true,"origin":"","legend":"","description":"","filename":"supplementary.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6851179/v1/148162678c1bcdc0a3c2349b.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Modelling Trichodesmium photophysiology in theGreat Barrier Reef using the eReefs models","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"","lastPublishedDoi":"10.21203/rs.3.rs-6851179/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6851179/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"The nitrogen-fixing cyanobacterium, Trichodesmium, is proposed to be a major source of nitrogen in the Great Barrier Reef(GBR). 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