Estuarine & Coastal Acidification Programme

 / Research / In-House /FTR/ Estuarine & Coastal Acidification Programme

The Project

Changes in coastal water chemistry can have extensive direct and indirect effects on the organisms and their habitats. The formation of HCO3 results in the depletion of CO32- in the water thereby hinder the capacity to precipitate calcium carbonate minerals (e.g., calcite and aragonite) by marine organisms whose protective shells or skeletons are composed of these minerals. Further, the eutrophic conditions may produce disproportional amounts of CO2 from microbial breakdown and hypoxic conditions. The combination of eutrophication and coastal acidification is likely to have greater adverse effects on coastal ecosystems. Hence, this need to be urgently addressed.

The Indian coastline, and more particularly the fragile islands, are subjected to several geo-morphological changes due to natural processes and manmade activities. Nitrogen is the primary cause of eutrophication in many coastal ecosystems. Therefore, optimal management of coastal eutrophication suggests controlling both N and P, in part because P can limit primary production in some systems. To address this issue, present study was carried out to understand the environmental changes and subsequent impacts of nutrient enrichment on the associated biota.

Realtime monitoring of GHG fluxes established at

Bhitarkanika National Park, Odisha


This study aimed to observe trends in pH in the coastal waters of Bhitarkanika mangroves, Odisha and coral reefs of Lakshadweep islands. It is essential to assess and quantify the role of nutrient loading from human sources on the coastal ecosystem processes. This in turn would help in understanding the causes and consequences of coastal and estuarine acidification


  • Establish data bank by long term monitoring of coastal waters; to track coastal acidification, global warming and its impact to various biological community.

  • Characterize natural/anthropogenic variability of carbonate chemistry in coastal ecosystems

  • Assess biological responses by various coastal organisms to ocean acidification through laboratory experiments

  • Prediction of short-term and long-term local coastal acidification effects from the seawater chemistry models.

Key Findings

Spatial variability in water quality of Minicoy lagoon

Spatial variability in water quality of Minicoy lagoon