Trophic Status Analysis and Nutrient Source Allocation in Urban Lakes of Dhaka, Bangladesh: A Comprehensive Approach to Eutrophication Monitoring

Trophic Status Analysis and Nutrient Source Allocation in Urban Lakes of Dhaka, Bangladesh: A Comprehensive Approach to Eutrophication Monitoring | 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 Trophic Status Analysis and Nutrient Source Allocation in Urban Lakes of Dhaka, Bangladesh: A Comprehensive Approach to Eutrophication Monitoring Farzana Ferdous Faria, Tasrif Nur Ariyan, Md. Younus Mia This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5004426/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 26 Nov, 2024 Read the published version in Environmental Monitoring and Assessment → Version 1 posted 9 You are reading this latest preprint version Abstract Urban lakes are vital to ecosystems, providing essential services and recreational spaces in densely populated megacities. However, rapid urbanization and anthropogenic activities, particularly eutrophication driven by macronutrient accumulation, severely threaten these water bodies. This study underscores the critical need for continuous trophic state monitoring to sustain fish, wildlife, and plant ecosystems. The trophic status of Dhanmondi, Gulshan, and Banani Lakes in Dhaka City, Bangladesh, was assessed using Carlson’s Trophic State Index (CTSI) and Burn’s Trophic Level Index (BTLI), based on Chlorophyll a (Chl-a), Total Phosphorus (TP), Secchi Disc Depth (SD), and Total Nitrogen (TN). Water samples from five sites per lake were analyzed for physicochemical parameters from June’23 to May’24, revealing monthly and seasonal variations. The study revealed that Dhanmondi Lake's CTSI ranged from 69.3 to 79.5 (June'23 to March'24), indicating initial "Eutrophic" conditions progressing to "Hypereutrophic". Gulshan Lake consistently showed "Hypereutrophic" conditions, with CTSI values between 84.1 and 97.3. Banani Lake was "Eutrophic" in June & July'23, transitioning to "Hypereutrophic" from August’23 to May’24 (84.1-97.7). The Trophic Level Index (TLI) showed the "Hypereutrophic" status with a progressive monthly escalation for all the lakes. The Water Quality Index (WQI) categorized the lakes as "Poor" to "Very Poor" from June to August’23, becoming "Unsuitable" from September’23 to May’24, indicating significant anthropogenic stress. Principal Component Analysis (PCA) identified nutrient infiltration, soil erosion, waste discharge, and organic residue accumulation as key pollution drivers. The study advocates for a multi-sectoral strategy to regulate nutrient loading and mitigate eutrophication, emphasizing best management practices for urban lake conservation. Secchi disc transparency Hypereutrophic Total Nitrogen Total Phosphorus Chlorophyll-a Full Text Additional Declarations No competing interests reported. Supplementary Files SupplimentaryMaterial.docx Cite Share Download PDF Status: Published Journal Publication published 26 Nov, 2024 Read the published version in Environmental Monitoring and Assessment → Version 1 posted Editorial decision: Revision requested 16 Oct, 2024 Reviews received at journal 12 Oct, 2024 Reviews received at journal 24 Sep, 2024 Reviewers agreed at journal 21 Sep, 2024 Reviewers agreed at journal 19 Sep, 2024 Reviewers invited by journal 19 Sep, 2024 Editor assigned by journal 16 Sep, 2024 Submission checks completed at journal 16 Sep, 2024 First submitted to journal 30 Aug, 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-5004426","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":366732148,"identity":"aa9478cc-df3a-4321-8d69-cd0599c131bd","order_by":0,"name":"Farzana Ferdous Faria","email":"","orcid":"","institution":"Bangladesh University of Professionals","correspondingAuthor":false,"prefix":"","firstName":"Farzana","middleName":"Ferdous","lastName":"Faria","suffix":""},{"id":366732149,"identity":"74fe66c5-5507-4d35-89c1-840c678bde3b","order_by":1,"name":"Tasrif Nur Ariyan","email":"","orcid":"","institution":"Bangladesh University of Professionals","correspondingAuthor":false,"prefix":"","firstName":"Tasrif","middleName":"Nur","lastName":"Ariyan","suffix":""},{"id":366732150,"identity":"2bfbfd02-70b6-476f-ae3a-1557bc3e1895","order_by":2,"name":"Md. 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However, rapid urbanization and anthropogenic activities, particularly eutrophication driven by macronutrient accumulation, severely threaten these water bodies. This study underscores the critical need for continuous trophic state monitoring to sustain fish, wildlife, and plant ecosystems. The trophic status of Dhanmondi, Gulshan, and Banani Lakes in Dhaka City, Bangladesh, was assessed using Carlson’s Trophic State Index (CTSI) and Burn’s Trophic Level Index (BTLI), based on Chlorophyll a (Chl-a), Total Phosphorus (TP), Secchi Disc Depth (SD), and Total Nitrogen (TN). Water samples from five sites per lake were analyzed for physicochemical parameters from June’23 to May’24, revealing monthly and seasonal variations. The study revealed that Dhanmondi Lake's CTSI ranged from 69.3 to 79.5 (June'23 to March'24), indicating initial \"Eutrophic\" conditions progressing to \"Hypereutrophic\". Gulshan Lake consistently showed \"Hypereutrophic\" conditions, with CTSI values between 84.1 and 97.3. Banani Lake was \"Eutrophic\" in June \u0026amp; July'23, transitioning to \"Hypereutrophic\" from August’23 to May’24 (84.1-97.7). The Trophic Level Index (TLI) showed the \"Hypereutrophic\" status with a progressive monthly escalation for all the lakes. The Water Quality Index (WQI) categorized the lakes as \"Poor\" to \"Very Poor\" from June to August’23, becoming \"Unsuitable\" from September’23 to May’24, indicating significant anthropogenic stress. Principal Component Analysis (PCA) identified nutrient infiltration, soil erosion, waste discharge, and organic residue accumulation as key pollution drivers. 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