01-05 December 2025
INCOIS, Hyderabad, India.
| Abstract Submission No. | ABS-08-0214 |
| Title of Abstract | Nutrient Dynamics Under Climate and Anthropogenic Stress: Lessons from the Persian Gulf for Marginal Seas |
| Authors | Maryam Ghaemi* |
| Organisation | Iranian National Institute for Oceanography and Atmospheric Scien |
| Address | Tehran Tehran, Tehran, Iran, Islamic Rep. Pincode: 1411813389 E-mail: mghaemi@inio.ac.ir |
| Country | Iran, Islamic Rep. |
| Presentation | Oral |
| Abstract | Marginal seas are hotspots of biogeochemical exchange, supporting productive ecosystems yet highly vulnerable to climate change and human pressures. The Persian Gulf (PG), a semi-enclosed and shallow basin in the northwest Indian Ocean, is experiencing rapid environmental change, making it an important natural laboratory for studying nutrient dynamics under multiple stressors. Recent high-resolution oceanographic surveys reveal marked shifts in nutrient concentrations, stoichiometric ratios, and limitation patterns, alongside hydrographic changes such as sustained warming, reduced dissolved oxygen, and increasing salinity. Observations indicate a transition from predominantly nitrogen limitation to a more complex mosaic of nutrient stress, including phosphorus and silicon co-limitation, with strong seasonal variability linked to circulation, atmospheric deposition, and diminishing riverine inflows. Elevated N:P ratios in surface waters suggest intensified nitrogen fixation, echoing patterns seen in other oligotrophic marginal seas such as the Red Sea and Eastern Mediterranean. These changes have significant implications for phytoplankton community structure, productivity, and food web dynamics, potentially affecting fisheries and biodiversity. This presentation will discuss the mechanisms driving these shifts, highlight parallels with other marginal seas, and consider the Persian Gulf as a sentinel system for anticipating the trajectory of nutrient regimes under combined climatic and anthropogenic pressures. |
| Are you part of IIOE-2 endorsed project | yes |
| Endorsed Project Number | IIOE2-EP61 |
| Keywords | Persian Gulf; Nutrient dynamics; Climate change; Marginal sea; Anthropogenic Stress |
| For Awards | no |