Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary
Abstract Spatio-temporal variation in phytoplankton community dynamics in a temporarily open/closed Swarnamukhi river estuary (SRE), located on the South East coast of India was investigated and correlated to that of the adjacent coastal waters. Understanding the seasonal variability of the phytopla...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-12-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-47779-1 |
| _version_ | 1827327418533150720 |
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| author | Ponnusamy Sathish Kumar Dharani Gopal Dilip Kumar Jha Krupa Ratnam Santhanakumar Jayapal Vikas Pandey Venkatnarayanan Srinivas Arthur James Rathinam |
| author_facet | Ponnusamy Sathish Kumar Dharani Gopal Dilip Kumar Jha Krupa Ratnam Santhanakumar Jayapal Vikas Pandey Venkatnarayanan Srinivas Arthur James Rathinam |
| author_sort | Ponnusamy Sathish Kumar |
| collection | DOAJ |
| description | Abstract Spatio-temporal variation in phytoplankton community dynamics in a temporarily open/closed Swarnamukhi river estuary (SRE), located on the South East coast of India was investigated and correlated to that of the adjacent coastal waters. Understanding the seasonal variability of the phytoplankton community and influencing factors are essential to predicting their impact on fisheries as the river and coastal region serve as the main source of income for the local fishing communities. Downstream before the river meets the sea, an arm of the Buckingham Canal (BC), carrying anthropogenic inputs empties into the Swarnamukhi River (SR1). The impact of anthropogenic effects on the phytoplankton community at BC was compared to other estuarine stations SR2 (upstream), SR1 (downstream), SRM (river mouth) and coastal station (CS). In BC station, harmful algal blooms (HABs) of Chaetoceros decipiens (2940 × 103 cells L−1) and Oscillatoria sp. (1619 × 103 cells L−1) were found during the southwest monsoon and winter monsoon, respectively. These HABs can be linked to the anthropogenic input of increased nutrients and trace metals. The HABs of Oscillatoria sp. were shown to be induced by elevated concentrations of nitrate (10.18 µM) and Ni (3.0 ppm) compared to ambient, while the HABs of C. decipiens were caused by elevated concentrations of silicate (50.35 µM), nitrite (2.1 µM), and phosphate (4.37 µM). Elevated nutrients and metal concentration from the aquaculture farms, and other anthropogenic inputs could be one of the prime reasons for the recorded bloom events at BC station. During this period, observed bloom species density was found low at other estuarine stations and absent at CS. The formation of bloom events during the closure of the river mouth could be a major threat to the coastal ecosystem when it opens. During the Osillatoria sp. bloom, both the Cu and Ni levels were higher at BC. The elevated concentration of nutrients and metals could potentially affect the coastal ecosystem and in turn fisheries sector in the tropical coastal ecosystem. |
| first_indexed | 2024-03-07T14:59:57Z |
| format | Article |
| id | doaj.art-f31919aa62f54262b380283723efd638 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-07T14:59:57Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-f31919aa62f54262b380283723efd6382024-03-05T19:13:22ZengNature PortfolioScientific Reports2045-23222023-12-0113111010.1038/s41598-023-47779-1Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuaryPonnusamy Sathish Kumar0Dharani Gopal1Dilip Kumar Jha2Krupa Ratnam3Santhanakumar Jayapal4Vikas Pandey5Venkatnarayanan Srinivas6Arthur James Rathinam7Ocean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesOcean Science and Technology for Islands, National Institute of Ocean Technology (NIOT), Ministry of Earth SciencesDepartment of Marine Science, Bharathidasan UniversityAbstract Spatio-temporal variation in phytoplankton community dynamics in a temporarily open/closed Swarnamukhi river estuary (SRE), located on the South East coast of India was investigated and correlated to that of the adjacent coastal waters. Understanding the seasonal variability of the phytoplankton community and influencing factors are essential to predicting their impact on fisheries as the river and coastal region serve as the main source of income for the local fishing communities. Downstream before the river meets the sea, an arm of the Buckingham Canal (BC), carrying anthropogenic inputs empties into the Swarnamukhi River (SR1). The impact of anthropogenic effects on the phytoplankton community at BC was compared to other estuarine stations SR2 (upstream), SR1 (downstream), SRM (river mouth) and coastal station (CS). In BC station, harmful algal blooms (HABs) of Chaetoceros decipiens (2940 × 103 cells L−1) and Oscillatoria sp. (1619 × 103 cells L−1) were found during the southwest monsoon and winter monsoon, respectively. These HABs can be linked to the anthropogenic input of increased nutrients and trace metals. The HABs of Oscillatoria sp. were shown to be induced by elevated concentrations of nitrate (10.18 µM) and Ni (3.0 ppm) compared to ambient, while the HABs of C. decipiens were caused by elevated concentrations of silicate (50.35 µM), nitrite (2.1 µM), and phosphate (4.37 µM). Elevated nutrients and metal concentration from the aquaculture farms, and other anthropogenic inputs could be one of the prime reasons for the recorded bloom events at BC station. During this period, observed bloom species density was found low at other estuarine stations and absent at CS. The formation of bloom events during the closure of the river mouth could be a major threat to the coastal ecosystem when it opens. During the Osillatoria sp. bloom, both the Cu and Ni levels were higher at BC. The elevated concentration of nutrients and metals could potentially affect the coastal ecosystem and in turn fisheries sector in the tropical coastal ecosystem.https://doi.org/10.1038/s41598-023-47779-1 |
| spellingShingle | Ponnusamy Sathish Kumar Dharani Gopal Dilip Kumar Jha Krupa Ratnam Santhanakumar Jayapal Vikas Pandey Venkatnarayanan Srinivas Arthur James Rathinam Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary Scientific Reports |
| title | Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary |
| title_full | Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary |
| title_fullStr | Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary |
| title_full_unstemmed | Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary |
| title_short | Impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open/closed estuary |
| title_sort | impact of anthropogenic accumulation on phytoplankton community and harmful algal bloom in temporarily open closed estuary |
| url | https://doi.org/10.1038/s41598-023-47779-1 |
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