Geography · Ch 5 — Natural Vegetation
Littoral and Swamp Forests
Littoral and Swamp Forests
The photograph is a close-up of mangrove vegetation, shot in black and white, so the eye goes straight to structure and texture rather than colour. You see low, dense, salt-tolerant plants packed tightly together, growing straight out of tidal, marshy ground. The ground itself is the real subject here — soft, waterlogged mud that is regularly flooded and drained by the tides. There are no tall trees, no clear stratification; instead the vegetation forms a tangled, shrubby thicket that looks almost impenetrable. That visual of stunted, crowded growth rooted in wet mud is the whole point of the image.
What the diagram teaches is that mangroves are not a forest type you can confuse with any other. They are littoral and swamp forests — vegetation that exists only in the intertidal zone, where salt water and fresh water meet. The plants you see are halophytes, species that have adapted to survive in saline conditions that would kill ordinary trees. The marshy, creek-crossed ground in the photograph is exactly the habitat the text describes: salt marshes, tidal creeks, mud flats and estuaries. The dense, low growth also hints at the ecological role of these forests — they shelter a wide variety of birds and stabilise the coastline against tidal action. …
The Big Idea First
Most of India's natural vegetation is shaped by rainfall and temperature. But along the coasts, in tidal zones, and in waterlogged lowlands, a completely different set of conditions rules: salt, water, and tides. The littoral and swamp forests are India's answer to these wet, salty, and marshy habitats. They are not one single forest type but a family of vegetation communities — from the famous mangroves of the Sunderbans to the freshwater marshes of the Gangetic plain — all united by their dependence on water.
Wetlands: The Foundation
India has a rich variety of wetland habitats. About 70 per cent of this wetland area is under paddy cultivation. The total wetland area of the country is 3.9 million hectares.
Two sites are protected as waterfowl habitats under the Convention of Wetlands of International Importance, known as the Ramsar Convention:
- Chilika Lake in Odisha
- Keoladeo National Park in Bharatpur, Rajasthan
An international convention is simply an agreement among member states of the United Nations.
The Eight Wetland Categories
The country's wetlands have been grouped into eight categories:
- The reservoirs of the Deccan Plateau in the south, together with the lagoons and other wetlands of the southern west coast.
- The vast saline expanses of Rajasthan, Gujarat, and the Gulf of Kachchh.
- Freshwater lakes and reservoirs from Gujarat eastwards through Rajasthan (including Keoladeo National Park) and Madhya Pradesh.
- The delta wetlands and lagoons of India's east coast, including Chilika Lake.
- The freshwater marshes of the Gangetic Plain.
- The floodplains of the Brahmaputra, along with the marshes and swamps in the hills of northeast India and the Himalayan foothills.
- The lakes and rivers of the montane region of Kashmir and Ladakh.
- The mangrove forests and other wetlands of the island arcs of the Andaman and Nicobar Islands.
Mangroves: The Heart of Littoral Forests
Mangroves grow along the coasts in salt marshes, tidal creeks, mud flats, and estuaries. They consist of a number of salt-tolerant species of plants — this tolerance of salt is their defining feature.
Crisscrossed by creeks of stagnant water and tidal flows, these forests give shelter to a wide variety of birds.
In India, mangrove forests spread over 4,992 sq. km, which is 7 per cent of the world's mangrove forests.
They are highly developed in two main areas:
- The Andaman and Nicobar Islands
- The Sunderbans of West Bengal
Other areas of significance are the Mahanadi, Godavari, and Krishna deltas. …
An international convention is an agreement among member states of the United Nations. India's mangrove-rich wetlands such as Chilika Lake (Odisha) and the Sunderbans have been protected under exactly this kind of convention, the Ramsar Convention on Wetlands of International Importance, which is why the chapter mentions littoral and swamp forest habi …