Current Affairs Topics Archive
International Relations Economics Polity & Governance Environment & Ecology Science & Technology Internal Security Geography Social Issues Art & Culture Modern History

Three Flamingo habitats have high toxin levels, report

March 23, 2026 4 min read Environment & Ecology GS3
On This Page ▼

What Happened

  • Three satellite wetland lakes — DPS, NRI, and T S Chanakya lakes at Nerul, Navi Mumbai — have been found to have dangerously high toxin and pollutant levels, according to water sample tests commissioned by the NatConnect Foundation.
  • Total Dissolved Solids (TDS), which indicate salinity and pollutant concentration, were recorded between 17,000 and 23,000 mg/L — far exceeding the healthy wetland norm of approximately 5,000 mg/L.
  • The wetlands, which serve as satellite feeding grounds for the Thane Creek Flamingo Sanctuary (TCFS) — a designated Ramsar site — showed signs of blocked or restricted tidal flow, turning them into stagnant, polluted basins instead of naturally flushed intertidal ecosystems.
  • Flamingos have not arrived at these sites this season, a stark ecological signal corroborated by the absence of natural tidal flushing.
  • NatConnect Foundation has written to the Prime Minister and Maharashtra Chief Minister flagging a "wetland emergency," urging immediate conservation intervention.

Static Topic Bridges

Ramsar Convention and Wetland Protection in India

The Ramsar Convention on Wetlands of International Importance was adopted in Ramsar, Iran in 1971 and came into force in 1975. India signed the convention on February 1, 1982. Wetlands designated under the Convention — called Ramsar Sites — are required to be maintained in their ecological character through national policies and management plans. Thane Creek Flamingo Sanctuary is one of India's 96 Ramsar Sites (as of 2025), and the first urban wetland in India to receive the Ramsar designation.

  • Ramsar Convention: adopted 1971, India signatory since 1982
  • India's Ramsar Sites tally: 96 (as of 2025), up from 26 in 2013
  • Thane Creek Flamingo Sanctuary: first Ramsar site within an urban agglomeration in India; largest in Maharashtra
  • Satellite wetlands like DPS, NRI, and T S Chanakya lakes are ecologically dependent on the main TCFS system

Connection to this news: The degradation of satellite wetland lakes feeding into a Ramsar site undermines India's treaty obligations to maintain the ecological character of designated wetlands, making this not just a local conservation issue but an international compliance concern.

Two flamingo species frequent India's wetlands: the Greater Flamingo (Phoenicopterus roseus) and the Lesser Flamingo (Phoeniconaias minor). The Greater Flamingo is classified as Least Concern by the IUCN, while the Lesser Flamingo is classified as Near Threatened. In India, flamingos are protected under Schedule IV of the Wildlife Protection Act, 1972, which prohibits hunting. The Lesser Flamingo is also listed under Appendix II of CITES. The Rann of Kutch in Gujarat is India's only regular Lesser Flamingo breeding ground, while Navi Mumbai's wetlands serve as a critical winter feeding and staging habitat.

  • Greater Flamingo: IUCN Least Concern; Lesser Flamingo: IUCN Near Threatened
  • Both protected under Wildlife Protection Act, 1972 — Schedule IV
  • Lesser Flamingo: CITES Appendix II (trade regulated)
  • Key threats: wetland destruction, urban expansion, untreated sewage, chemical pollution
  • Navi Mumbai wetlands: critical wintering/staging habitat; Rann of Kutch: only regular breeding ground

Connection to this news: The failure of flamingos to arrive this season at Nerul lakes — attributable directly to toxic water quality — represents a near-term population-level stress event for a Near Threatened species relying on a narrow network of Indian wetland habitats.

Intertidal Wetlands and Urban Ecological Stress

Intertidal wetlands — areas between high and low tide marks — depend on regular tidal flushing to maintain water quality, salinity balance, and biodiversity. When tidal flows are blocked by urban infrastructure, reclamation, or encroachment, these wetlands stagnate, accumulating pollutants, sewage, and industrial effluents. India has lost over 30% of its natural wetlands in the past three decades due to urbanisation, mining, encroachment, and policy neglect. Urban wetlands face compounded threats: real estate pressure reduces area, and adjacent development degrades water quality even in remaining patches.

  • TDS threshold for healthy wetlands: ~5,000 mg/L; Nerul lakes recorded 17,000–23,000 mg/L
  • India's wetland loss: over 30% in three decades
  • Root cause at Nerul: restricted tidal flow converting intertidal wetland into stagnant basin
  • Policy tools: Wetlands (Conservation and Management) Rules 2017 (India), National Wetland Conservation Programme

Connection to this news: The extreme TDS readings at the Nerul lakes directly result from tidal flow obstruction — a symptom of urban infrastructure encroaching on wetland hydrology — illustrating how city expansion converts ecologically functional wetlands into pollution sinks.

Key Facts & Data

  • Three lakes flagged: DPS Lake, NRI Lake, T S Chanakya Lake — all at Nerul, Navi Mumbai
  • TDS levels recorded: 17,000–23,000 mg/L (healthy threshold: ~5,000 mg/L)
  • Organisation that commissioned tests: NatConnect Foundation (director: B N Kumar)
  • Parent wetland: Thane Creek Flamingo Sanctuary (TCFS) — a Ramsar site
  • Flamingos absent this season from these satellite habitats
  • India's total Ramsar sites: 96; TCFS is the first urban Ramsar site in India
  • Lesser Flamingo IUCN status: Near Threatened; Schedule IV, WPA 1972
  • India has lost over 30% of wetlands in the past 30 years