Littoral and Swamp Forests are abundant throughout India. They're mostly found in Deccan Plateau reservoirs, Gujarat's saline coast, Rajasthan's saline coast, the Gulf of Kutch, Eastern Coast Deltas, Kashmir's lakes and rivers, and North East India's swamps. They are found in India's natural vegetation. Littoral and Swamp forests are also called wetland forests and tidal forests. The biotic components (producer, consumers and decomposers) such as Rhizophora mangle (Mangroves), Manilkara littoralis, Thespesia, Spinifex littoreus, Casuarina equisetifolia, and other common species can be found in these forests. The abiotic factors (climate, temperature, soil, precipitation) such as sandy soil with a lot of lime and salts, but lack of nitrogen and other minerals characterizes this forest ecosystem. This article will explain to you about Littoral and Swamp Forests which will be helpful in preparing the Environment syllabus for the UPSC Civil service exam.

Littoral and Swamp Forests in India

• India has a diverse range of wetland habitats, with a total size of around 3.9 million hectares.
• In India, the wetlands have been divided into eight different categories. They are
  • The Deccan Plateau reservoirs in the south, as well as lagoons and other wetlands along the southwest coast.
  • Rajasthan, Gujarat, and the Kutch Gulf
  • Gujarat, Rajasthan, and Madhya Pradesh have freshwater lakes and reservoirs.
  • The east coast's delta marshes and lagoons.
  • The Gangetic plain's freshwater marshes.
  • Brahmaputra's floodplains and Himalayan slopes.
  • Kashmir's montane region's lakes and rivers.
  • Andaman & Nicobar Islands' wetlands.
• Outside India, Central America, Brazil, Argentina, tropical Africa, and Southeast Asia are home to the world's greatest swamp forests (particularly Borneo, the island of New Guinea, Laos, and Cambodia).
• Central Asia and the southern United States both have large swamp forests.

Distribution of Littoral and Swamp Forests in India

Littoral and Swamp Forests- Classification

Beach Forests

• Depending on the location, rainfall ranges from 75 cm to 500 cm in the Beach forests.
• These forests have pleasant temperatures.
• Manilkara Littoralis, Thespesia, Spinifex Littoreus, Casuarina Equisetifolia, Pandanus, Borassus, Cocos Nucifera, Phoenix, Callophyllum Littoralis, Barringtonia, and Pongamia are some of the common autotrophs found in these forests.
• A number of twiners and climbers are also present.

Tidal Forests

• Tidal forests are sometimes known as mangrove forests.
• Mangrove forests occur in salt marshes, tidal creeks, and estuaries along the coast.
• It is home to a great number of different types of birds.
• The following are the four sub-types of tidal forests.
  • Tree mangrove forests
  • Low mangrove forests
  • Saltwater forests and
  • Brackish water forests.

Freshwater Swamp Forests

• Freshwater swamp forests are forests that are permanently or seasonally inundated with freshwater.
• They are also known as flooded forests.
• They are most commonly seen in the lower parts of rivers and near freshwater lakes.
• Salix Tetrasperma, Acer, Putranjiva, Holoptelia, Cephalanthus, Barringtonia, Olea, Phoebe, Ficus, Murraya, Adhatoda, Canna, and a variety of autotrophic green plants are all found in freshwater swamp forests.

Soil in Littoral or Swamp Forests

• Swamp forests form where inadequate drainage and permanent soil waterlogging are caused by topography.
• Due to this obvious unique hydrologic environment, plant debris tends to accumulate on the forest floor, which can contribute to the creation of thick peat deposits over time.
• Peat is a type of soil that is largely made up of partially degraded organic matter.
• Thus it can be said that the swamp forests grow on peat-depleted soils that are constantly flooded.

Features of Flora in Littoral and Swamp Forests

• The majority of the trees are evergreen. During low tides, they usually produce tangled webs of arching roots that are visible.
• This vegetation evolved as a result of two factors:
  • High salinity in the water.
  • Flooded on a regular basis.
• Stilt roots, buttress, pneumatophores, and other adaptations are prominent among these.

Stilt roots (Prop Roots)

• Stilt roots are mangrove roots that outgrow the tree's trunk, branches, or other stilt roots.
• The tip of the stilt root generates an underground root system as soon as it reaches the ground.
• The stilt root is connected to the ground by this system, which then develops one or more additional stilt roots.
• This process is repeated multiple times as the roots grow into the air before returning to the ground to form an underground root system.

Stilt Roots

Buttress Roots

• Many trees develop buttress roots in mangroves, which offer stability to large trees.
• The buttress roots can reach a height of up to ten meters.
• Buttress roots, sometimes known as buttresses, do not continue to grow underground in the same way as they do above.
• Buttress roots create a large number of tiny roots that sprout in the soil beneath the buttress root.

Buttress Root

Pneumatophores

• During high tides, the roots are starved of oxygen due to waterlogged conditions.
• The roots of some mangrove trees grow vertically above the ground.
• Pneumatophores are the name for these specialised roots.
• When other roots are submerged beneath water during high tide, they have pores that allow the trees to breathe.

Pneumatophore Roots

Significance

• Pollination and seed dissemination are both aided by this habitat.
• The littoral and swamp forests are both economically and environmentally significant.
• Freshwater Swamp Forests ecosystem helps in the purification of water.
• These forests also serve as protected areas for wildlife.
• Plant species have a wide range of genetic variation. In addition, this forest also offers leisure opportunities.
• As the forest has Mangroves in abundance, their pivotal role can not be understated.
• Mangroves provide the first line of defence for the coastal areas of littoral and swamp forests against cyclones, strong surges, tsunamis, and other natural disasters.
• They play a key role in climate change mitigation and adaptation, as well as community livelihoods and food security.
• Mangroves are regarded as coastal gems because they increase the scenic value of the area and attract a variety of bird species.
• The mangrove ecosystem is extremely productive, providing shelter and a nursery for a variety of fish species as well as other animals in the vicinity.
• Mangroves also aid in temperature reduction.

Conclusion

Anthropogenic activities such as deforestation, urbanization, water pollution, algal blooms, overgrazing, industrial effluent discharge, agriculture runoff, and land pollution are all major threats to the littoral and swamp forest ecosystems. One of the most serious problems that mangrove ecosystems face is salinity. Reduced freshwater flow into this habitat is also a major hazard to the wetland ecology.