In the current study, the stoichiometry of dissolved nutrients was addressed in the Pasur River estuary (PRE) mangrove ecosystems of Bangladesh to characterize the ecological and nutrient state of the inter-tidal mangroves in light of rising human disturbances from January to December 2019. The findings suggest excess phosphorus (P) relative to nitrogen (N) in these systems, indicating that mangrove coastal habitats along the PRE are severely N-constrained. Since the silica(Si): N ratio in the PRE mangrove estuary was greater than 1, it was concluded that the estuarine mangrove waters receive a significant amount of silica from terrestrial weathering. P can limit primary production in some systems; therefore, managing both N and P is recommended for an optimal management of coastal eutrophication, even though N is likely the main source of eutrophication in most coastal systems in the tropical zone. Excess P in estuaries can also combine with nitrogen (N) and silica (Si) availability to destabilize ecosystems. Through mechanisms such as enhanced Si fluxes, decreasing P in upstream freshwater habitats can also benefit coastal marine ecosystems. These intricate relationships are important while devising strategies to reduce nutrient pollution in coastal areas.