Western Ghats: India's Biodiversity Hotspot Explained for UPSC SSC

Geographical Extent and Features

The Western Ghats, also known as the Sahyadri Mountains, run parallel to the western coast of the Indian peninsula. They stretch for approximately 1,600 kilometers from the Satpura Range in the north, across Gujarat, Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu, ending at Kanyakumari. The average elevation of the Western Ghats is around 1,200 meters, with some peaks exceeding 2,000 meters. Anamudi, located in Kerala, is the highest peak in the Western Ghats, standing at 2,695 meters above sea level. This mountain range acts as a significant barrier, intercepting the monsoon winds originating from the Arabian Sea, which leads to heavy rainfall on its western slopes.

The Western Ghats are older than the Himalayas, having been formed during the break-up of the supercontinent Gondwana. Their geological history contributes to their unique landscape, featuring steep escarpments, deep valleys, and numerous perennial rivers. Major rivers like Godavari, Krishna, and Kaveri originate in the Western Ghats, flowing eastward across the Deccan Plateau. These rivers are vital for irrigation, drinking water, and hydroelectric power generation for millions of people in peninsular India. The varied topography and climatic conditions across the range support a wide array of ecosystems, from tropical evergreen forests to montane grasslands.

Biodiversity Hotspot Status

The Western Ghats were declared a UNESCO World Heritage Site in 2012, recognizing their outstanding universal value. They are one of the world's eight 'hottest hotspots' of biological diversity, a term coined by Norman Myers in 1988. To qualify as a biodiversity hotspot, a region must meet two strict criteria: it must contain at least 1,500 species of vascular plants as endemics (i.e., found nowhere else on Earth) and it must have lost at least 70% of its primary vegetation. The Western Ghats easily meet both criteria, boasting an extraordinary concentration of endemic species.

This region is home to at least 325 globally threatened species, including plants, mammals, birds, amphibians, reptiles, and fish. It is estimated that over 30% of India's plant species and over 27% of its bird species are found here. The high level of endemism is particularly notable among amphibians and reptiles. For example, nearly 80% of the amphibian species found in the Western Ghats are endemic to the region. This unique biological richness makes the Western Ghats an irreplaceable natural heritage and a critical area for global conservation efforts.

Flora and Fauna Diversity

The Western Ghats exhibit a remarkable diversity of flora, including tropical evergreen forests, moist deciduous forests, shola grasslands, and montane forests. Over 7,400 species of flowering plants, 1,814 species of non-flowering plants, 139 mammal species, 508 bird species, 179 amphibian species, 157 reptile species, and 219 fish species have been documented here. Many of these species are endemic, meaning they are found exclusively in this region. Notable endemic plant species include the Neelakurinji (Strobilanthes kunthiana), which flowers once every 12 years, and various species of wild balsam.

Key faunal species include the endangered Lion-tailed Macaque, Nilgiri Tahr, Malabar Civet, and Indian Elephant. The region is also a stronghold for tigers and leopards. The diverse birdlife includes species like the Malabar Grey Hornbill and the Rufous Babbler. The amphibian diversity is particularly striking, with numerous frog species discovered regularly. The unique ecosystems, such as the shola-grassland mosaic, support distinct communities of plants and animals adapted to specific microclimates. The high rainfall and varied topography create numerous ecological niches, fostering this incredible biodiversity.

Conservation Challenges and Efforts

Despite its rich biodiversity, the Western Ghats face significant threats. Deforestation for agriculture, plantations (tea, coffee, rubber), mining, hydroelectric projects, and urban expansion are major challenges. Poaching, human-wildlife conflict, and the spread of invasive alien species also pose serious risks to the region's ecosystems. Climate change is an emerging threat, impacting rainfall patterns and temperature, which can alter habitats and species distribution. The fragmentation of forests due to developmental activities isolates wildlife populations, making them more vulnerable.

Various conservation efforts are underway to protect the Western Ghats. These include the establishment of numerous National Parks, Wildlife Sanctuaries, and Tiger Reserves, such as Periyar National Park, Silent Valley National Park, and Bhadra Wildlife Sanctuary. The Indian government has implemented policies like the Forest Conservation Act, 1980, and the Wildlife Protection Act, 1972, to safeguard these areas. Local communities and NGOs also play a crucial role in conservation through sustainable practices and awareness programs. The Gadgil Committee (Western Ghats Ecology Expert Panel) and the Kasturirangan Committee were formed to recommend measures for the conservation and protection of the Western Ghats, highlighting the region's ecological sensitivity and the need for careful development.

Important Keywords Explained

Biodiversity Hotspotconcept

A biogeographic region with a significant reservoir of biodiversity that is under threat from humans. To qualify, an area must have at least 1,500 endemic plant species and have lost 70% of its original habitat. The concept was introduced by Norman Myers.

Endemic Speciesconcept

A species that is unique to a defined geographic location, such as an island, nation, or other defined zone, and is not found naturally anywhere else in the world. High endemism is a key characteristic of biodiversity hotspots like the Western Ghats.

Shola Forestsplace

Patches of stunted evergreen tropical and subtropical moist broadleaf forests found in valleys and depressions, interspersed with montane grasslands, in the higher altitude regions of the Western Ghats. They are unique ecosystems with specific flora and fauna.

Gadgil Committeeorganization

Officially the Western Ghats Ecology Expert Panel (WGEEP), chaired by Madhav Gadgil. Formed in 2010, it recommended classifying the entire Western Ghats into three Ecologically Sensitive Zones (ESZs) and proposed a new governance structure for environmental protection.

Kasturirangan Committeeorganization

High-Level Working Group (HLWG) on Western Ghats, chaired by K. Kasturirangan. Formed in 2012 to review the Gadgil Committee report. It recommended declaring 37% of the Western Ghats as Ecologically Sensitive Area (ESA) and proposed a 'red', 'orange', 'green' classification for developmental activities.

Additional Facts & Context

• The Western Ghats cover an area of approximately 160,000 square kilometers.
• It is home to over 7,400 species of flowering plants.
• Over 139 species of mammals are found in the region.
• The Western Ghats receive an average annual rainfall of 2,000-5,000 mm on its western slopes.
• The region is a source for 38 major rivers in peninsular India.