01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-03-0209 |
| Title of Abstract | Hydrobiological Responses to Seasonal Forcing in Coastal Waters off Paradip, Bay of Bengal |
| Authors | Sumit Kumar Mohanty*, Sumit Kumar Mohanty*, Suchismita Srichandan, Suchismita Sahu, Baisakhi Pattnaik, Alok Sethi, Susmita Raulo, Sanjiba K. Baliarsingh, Kamal K. Barik, Alakes Samanta, Pratap K. Chhotaray |
| Organisation | Department of Marine Sciences, Berhampur University, Bhanja Bihar |
| Address | Kalidaspur, Haripur Balasore, Odisha, India Pincode: 756003 E-mail: sumit.mohanty@cutm.ac.in |
| Country | India |
| Presentation | Poster |
| Abstract | This study investigates the hydrobiological response to seasonal forcing through an integrated approach, combining vertical water column profiling with multivariate statistical analysis of various environmental parameters in the coastal waters off Paradip, western Bay of Bengal. The high-resolution vertical profiles of temperature, salinity, chlorophyll-a (chl-a), turbidity, and dissolved oxygen were recorded from January 2024 to July 2025 at three stations located up to 23km from the coast. Seasonal changes were significantly observed in the surface and subsurface during the study period. During the pre-monsoon, elevated sea surface temperature (SST) and salinity indicated a limited freshwater input, and resultant thermal stratification with relatively reduced dissolved oxygen (DO) concentration. Subsurface waters exhibited stable salinity, and a positive correlation between turbidity and chl-a indicated enhanced biological productivity. Despite low freshwater influx, the anthropogenic material flux sometimes influenced the turbidity of this region during this season. By the onset of monsoon, a strong riverine freshwater influx disrupted stratification and reduced light availability, leading to suppressed phytoplankton growth. Although a peculiar phenomenon of phytoplankton was found in the transitional station, where the sub-surface chl-a maximum was observed with concentrations exceeding 8 mg m⁻³. During the post-monsoon, SST was found to be the lowest of all time, and the salinity began to recover. The increase in DO and turbidity was attributed to biological processes. Non-metric multidimensional scaling (NMDS) ordination and correlation matrices revealed that Station-1 is primarily a physically dominated system, with turbulence and terrestrially-sourced sediments contributing to high turbidity and reduced biological activity. Station-2 serves as a transitional mixing zone, influenced by both coastal and offshore processes, while Station-3 represents a biologically dominated system where phytoplankton are tightly coupled with physical conditions. This study highlights the effectiveness of combining physical profiling with multivariate techniques to provide a comprehensive understanding hydrobiological forcing of a coastal region. |
| Are you part of IIOE-2 endorsed project | no |
| Keywords | Hydrobiology; Monsoon; Chlorophyll-a; Multivariate Analysis; Mahanadi |
| For Awards | yes |
| Date Of Birth | 04-01-2000 |
| ECSN Registration Number | IIOE2-ECSN-0143 |