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Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh

Vertical profile of dissolved oxygen (DO) and associated water variables were measured in the head of the Pasur-Rupsha estuary of Bangladesh. Water samples were collected from two stations at 0.60 m depth intervals during high and low tides from July, 2016 to January, 2017. DO concentration was rang...

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Autores principales: Rouf, Muhammad Abdur, Islam, Md. Jahidul, Roknuzzaman, Md., Siddique, Md. Noman, Golder, Md Rony
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9583121/
https://www.ncbi.nlm.nih.gov/pubmed/36276724
http://dx.doi.org/10.1016/j.heliyon.2022.e10935
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author Rouf, Muhammad Abdur
Islam, Md. Jahidul
Roknuzzaman, Md.
Siddique, Md. Noman
Golder, Md Rony
author_facet Rouf, Muhammad Abdur
Islam, Md. Jahidul
Roknuzzaman, Md.
Siddique, Md. Noman
Golder, Md Rony
author_sort Rouf, Muhammad Abdur
collection PubMed
description Vertical profile of dissolved oxygen (DO) and associated water variables were measured in the head of the Pasur-Rupsha estuary of Bangladesh. Water samples were collected from two stations at 0.60 m depth intervals during high and low tides from July, 2016 to January, 2017. DO concentration was ranged from 6.0 to 8.6 mg/l with maximum two units of variation in the profiles of the stations and demonstrated an inconsistent stratification pattern. The observed stratification pattern was remarkably triggered by a relatively high concentration of DO in the bottom layer than that of the surface layer during both the high and low tides in most of the study periods. High rate of freshwater flow at the surface; existence of estuarine gravitational circulation with 5–15 m depth profile; and lack of consumers in the bottom due to the high deposition of sediment particles were found responsible for the relatively high concentration of DO at bottom and low in surface layer of the estuary. Water temperature, salinity, pH, phytoplankton density and transparency were ranged from 22 to 32 °C, 0–6 ppt, 7.0 to 8.5, 1000–23000 ind/l and 13–17 cm respectively considering the depth profiles in the study periods. Temperature and plankton density were found significantly (P < 0.000) correlated with DO while the pH and salinity did not show any significant (P > 0.3) correlation. The ecosystem process associated with the vertical profile of DO explained in this study will provide considerable advances in understanding the ecosystem dynamics of the Pasur-Rupsha Estuary of Bangladesh.
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spelling pubmed-95831212022-10-21 Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh Rouf, Muhammad Abdur Islam, Md. Jahidul Roknuzzaman, Md. Siddique, Md. Noman Golder, Md Rony Heliyon Research Article Vertical profile of dissolved oxygen (DO) and associated water variables were measured in the head of the Pasur-Rupsha estuary of Bangladesh. Water samples were collected from two stations at 0.60 m depth intervals during high and low tides from July, 2016 to January, 2017. DO concentration was ranged from 6.0 to 8.6 mg/l with maximum two units of variation in the profiles of the stations and demonstrated an inconsistent stratification pattern. The observed stratification pattern was remarkably triggered by a relatively high concentration of DO in the bottom layer than that of the surface layer during both the high and low tides in most of the study periods. High rate of freshwater flow at the surface; existence of estuarine gravitational circulation with 5–15 m depth profile; and lack of consumers in the bottom due to the high deposition of sediment particles were found responsible for the relatively high concentration of DO at bottom and low in surface layer of the estuary. Water temperature, salinity, pH, phytoplankton density and transparency were ranged from 22 to 32 °C, 0–6 ppt, 7.0 to 8.5, 1000–23000 ind/l and 13–17 cm respectively considering the depth profiles in the study periods. Temperature and plankton density were found significantly (P < 0.000) correlated with DO while the pH and salinity did not show any significant (P > 0.3) correlation. The ecosystem process associated with the vertical profile of DO explained in this study will provide considerable advances in understanding the ecosystem dynamics of the Pasur-Rupsha Estuary of Bangladesh. Elsevier 2022-10-07 /pmc/articles/PMC9583121/ /pubmed/36276724 http://dx.doi.org/10.1016/j.heliyon.2022.e10935 Text en © 2022 The Author(s) https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Research Article
Rouf, Muhammad Abdur
Islam, Md. Jahidul
Roknuzzaman, Md.
Siddique, Md. Noman
Golder, Md Rony
Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title_full Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title_fullStr Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title_full_unstemmed Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title_short Vertical profile of dissolved oxygen and associated water variables in the Pasur-Rupsha estuary of Bangladesh
title_sort vertical profile of dissolved oxygen and associated water variables in the pasur-rupsha estuary of bangladesh
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9583121/
https://www.ncbi.nlm.nih.gov/pubmed/36276724
http://dx.doi.org/10.1016/j.heliyon.2022.e10935
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