Western Ghats

Coordinates: 10°10′11″N 77°03′40″E / 10.16972°N 77.06111°E / 10.16972; 77.06111
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Western Ghats
Sahyadri
Anaimudi, the highest peak in the Western Ghats
Highest point
PeakAnamudi, Eravikulam National Park
Elevation2,695 m (8,842 ft)
Coordinates10°10′11″N 77°03′40″E / 10.16972°N 77.06111°E / 10.16972; 77.06111
Dimensions
Length1,600 km (990 mi) N–S
Width100 km (62 mi) E–W
Area160,000 km2 (62,000 sq mi)
Geography
Satellite imagery showing the Western Ghats running parallel to the west coast of India
CountryIndia
RegionWestern and Southern India
StatesGujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu
BiomeTropical rainforests and Marsh
Geology
Age of rockCenozoic
Type of rockBasalt, Laterite and Limestone
CriteriaNatural: ix, x
Reference1342
Inscription2012 (36th Session)
Area795,315 ha

The Western Ghats, also known as the Sahyadris, is a mountain range that stretchs 1,600 km (990 mi) along the western coast of the Indian peninsula. Covering an area of 160,000 km2 (62,000 sq mi), it traverses the states of Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu. The mountains form an almost continuous chain of mountains along the western edge of the Deccan Plateau from the Tapti river to the southern tip of the Indian peninsula at Kanniyakumari. The Western Ghats meets with the Eastern Ghats at Nilgiris before continuing south.

Geologic evidence indicates that the mountains were formed during the break-up of the supercontinent of Gondwana. The mountains came along the west coast of India somewhere in the late Jurassic and early Cretaceous period when India seperated from the African continent. The mountains can be roughly divided into three parts, northern section with elevation ranging from 900–1,500 m (3,000–4,900 ft), middle section starting from south of Goa with a lower elevation of less than 900 m (3,000 ft) and the southern section where the altitude rises again. The Western Ghats have several peaks that rise above 2,000 m (6,600 ft), with Anamudi (2,695 m (8,842 ft)) being the highest peak. The average elevation is around 1,200 m (3,900 ft).

The Western Ghats form one of the major watersheds of India, feeding many perennial river systems that drain almost 40% of the land area of the country. Because of the higher elevation of the Deccan plateau on the west, most rivers flow from eastwards towards the Bay of Bengal, resulting in chiselled eastern slopes and steeper western slopes, facing the Arabian sea. The Western Ghats plays an important role in determining the climate and seasons in India. It blocks the rain bearing monsoon winds flowing eastward from the Arabian Sea, resulting in rainfall along the western coast. By the time the air rises above the mountains, it becomes dry, resulting in forming a rain shadow region with very less rainfall on the leeward side towards the interior of the Deccan plateau.

The Western Ghats region is a biodiversity hotspot. It contains of a large number of different species of flora and fauna, significant of which are endemic to this region. At least 325 globally threatened species occur in the Western Ghats. The region was declared as a UNESCO World Heritage Site in 2012.

Etymology[edit]

The name Western Ghats is a portmanteau of the word Ghat and the cardinal direction in which it is located with respect to the Indian mainland. Ghat, a term used in the Indian subcontinent, depending on the context could either refer to a range of stepped-hills such as the Eastern Ghats and Western Ghats; or the series of steps leading down to a body of water or wharf.[1][2] As per linguist Thomas Burrow, the word Ghat was derived from similar words used in various Dravidian languages such as kattu (mountain side, ridge or dam) in Tamil, katte (dam), gatta (mountain) and gattu (bank or shore) in Kannada and katta (dam) and gatte (shore or embankment) in Telugu.[3] The ancient name for the mountain range is Sahyadri, derived from Sanskrit, meaning benevolent or tolerant mountain.[4]

Geology[edit]

The Western Ghats are the mountainous faulted and eroded edge of the Deccan Plateau. Geologic evidence indicates that they were formed during the break-up of the supercontinent of Gondwana. After the break-up, the Deccan plateau was formed by basalt rocks and caused the western side to raise at an elevation.[5]

Geophysical evidence indicates that the mountains came along the west coast of India somewhere in the late Jurassic and early Cretaceous period when India seperated from the African continent.[6] Several faults triggerred the formation of Western Ghats interspersed with valleys and river gorges. Because of the elevation of the Deccan plateau on the west, most rivers flow from west to east, resulting in chiselled eastern slopes and steeper western slopes, facing the sea.[6]

Geography[edit]

Western Ghats form a continuous chain of mountains

The Western Ghats extend from the Satpura Range south of the Tapti river in the north and runs approximately 1,600 km (990 mi) to the southern tip of the Indian peninsula at Kanniyakumari. It covers an area of 160,000 km2 (62,000 sq mi) traversing across the Indian states of Gujarat, Maharashtra, Goa, Karnataka, Kerala and Tamil Nadu.[7]

Topography[edit]

Topography: Western Ghats (southern part)
Further information: List of peaks in the Western Ghats

The Western Ghats form an almost continuous chain of mountains running parallel to the western coast of India along the Arabian sea.[8] The average elevation is around 1,200 m (3,900 ft).[9] There are three gaps in the mountain range, the northenmost Goa Gap formed 65–80 million years ago (Mya), the oldest and widest Palghat Gap formed 500 Mya and the southern most, narrowest Shencottah Gap.[10] The narrow coastal plain between the Western Ghats and the Arabian Sea is known as the Western Coastal Plains.[11]

The mountains can be roughly divided into three parts, northern section with elevation ranging from 900–1,500 m (3,000–4,900 ft), middle section starting from south of Goa with a lower elevation of less than 900 m (3,000 ft) and the southern section where the altitude rises again.[8] The Western Ghats meets with the Eastern Ghats at Nilgiris before continuing south.[12] The Western Ghats have many peaks that rise above 2,000 m (6,600 ft), with Anamudi (2,695 m (8,842 ft)) being the highest peak.[13]

Hydrography[edit]

The Western Ghats form one of the major watersheds of India, feeding many perennial rivers of India. These major river systems drain almost 40% of the land area of the country.[14] The major river systems originating in the Western Ghats are the Godavari, Kaveri and Krishna.[8][15] Most rivers flow eastwards towards the Bay of Bengal owing to the steeper gradient moving from east to west and many smaller streams drain the region, often carrying a large volume of water during the monsoon months.[14] The streams and rivers give rise to numerous waterfalls in the region.[16] The rivers have been dammed for hydroelectric and irrigation purposes with major reservoirs spread across the region.[17][18]

Climate[edit]

Annual rainfall

The Western Ghats plays an important role in determining the climate and seasons in India. During the dry summer months of April-May, heat builds up in the land, which draws air from the sea. The air which picks up moisture along the way and flows eastward from the Arabian Sea, is blocked by the Western Ghats.[19] The rising air cools and brings about orographic precipitation along the western coast.[20] This signifies the onset of the monsoon season in June. By the time the air rises above the mountains, it becomes dry, resulting in forming a rain shadow region with very less rainfall on the leeward side towards the interior of the Deccan plateau. The monsoon winds rounding up the peninsula, and moving from the east from the Bay of Bengal pass over the Eastern Ghats and bring majority of the rainfall to the plains up north.[21]

Climate in the mountains show variations with altitude across the range. Due to its physical proximity to the equator and the Arabian Sea, the region experiences a warm and humid tropical climate around the year. Mean temperatures range from 20 °C (68 °F) in the south to 24 °C (75 °F) in the north. Subtropical climate or temperate climate and occasional near zero temperatures during winter is experienced in regions with higher elevations. The coldest periods in the region are the wettest monsoon period in the southern part of the mountain range.[22] Annual rainfall in this region averages 100 cm (39 in) to 900 cm (350 in) with an average rainfall of 250 cm (98 in). The total amount of rain does not depend on the spread of the area; areas in northern Maharashtra receive heavy rainfall followed by long dry spells, while regions closer to the equator receive lower annual rainfall and have rain spells lasting several months in a year.[22]

Bio-diversity[edit]

The Western Ghats region is a biodiversity hotspot.[23][24] It consists of nearly 30% of all the species of flora and fauna found in India, significant of which are endemic to this region.[25][26] At least 325 globally threatened species occur in the Western Ghats.[7]

Flora[edit]

The Western Ghats consist of four tropical and subtropical moist broadleaf terrestrial ecoregions of the Indomalayan realm with the northern portion of the range generally drier than the southern portion.[27] These include the following:

Sholas, part of the rainforests
Terrestrial ecoregions of Western Ghats
Region Area Areas covered
North Western Ghats montane rain forests[28] 11,900 sq mi (31,000 km2) Karnataka, Kerala, Maharashtra, Tamil Nadu
South Western Ghats montane rain forests[29] 8,700 sq mi (23,000 km2) Kerala, Tamil Nadu
North Western Ghats moist deciduous forests[30] 4,831 sq mi (12,510 km2) Karnataka, Maharashtra
South Western Ghats moist deciduous forests[31] 2,382 sq mi (6,170 km2) Karnataka, Kerala, Tamil Nadu

Other types of eco-systems include dry deciduous forests on the leeward rain shadow region, scrub forests at the foothills, peat bogs and swamps.[32] Montane grasslands are found in high altitude locations in the south Western Ghats interspersed with Sholas, a unique type of stunted tropical montane forest found in the valleys between the mountains.[33]

Earlier sources indicated about four to five thousand vascular plant species of which nearly one-third was endemic to the region.[34] Later studies and publications have recorded 7,402 species of flowering plants occurring in the Western Ghats of which 5,588 were described as indigenous, 376 are naturalized exotics and 1,438 species are cultivated or planted.[35] Among the indigenous species, 2,253 species are endemic to India and of them, 1,273 species are exclusively confined to the Western Ghats. 645 tree species were recorded with a high endemic ratio of 56%. There are 850-1000 species of bryophytes including 682 species of mosses (28% endemic) and 280 species of liverworts (43% endemic), 277 species of pteridophytes and 949 species of lichens (26.7% endemic).[36]

Fauna[edit]

The Western Ghats are home to thousands of species of fauna including at least 325 globally threatened species.[37] As per a 2010 report, following is the distribution of faunal species in the Western Ghats apart from more than 6,000 insect species.[38].[32]

A gaur herd
Fauna of Western Ghats (2010)
Taxonomic group Species Endemic % Endemic Endangered
Mammals 120 14 12% 31
Birds 508 19 4% 15
Amphibians 121 94 78% 43
Reptiles 156 97 62% 5
Fishes 218 116 53% 1

Western Ghats region has one of the highest tiger population estimated at 985 in 2022.[39] The Western Ghats ecoregion has the largest Indian elephant population in the wild with an estimated 11,000 individuals across eight distinct populations.[40][41] Other mammals include endangered and vulnerable species such as lion-tailed macaque, Nilgiri tahr, leopard, Nilgiri langur, dhole and gaur.[42][43][44] The endemic Nilgiri tahr, which was on the brink of extinction, has recovered and has an estimated 3,122 individuals in 2015.[45][46] Smaller endemic species include the Malabar large-spotted civet, Nilgiri marten, brown palm civet, stripe-necked mongoose, Indian brown mongoose, small Indian civet, and leopard cat.[47][48]

Bicolored frog, rare frog species endemic to the region

As per a 2014 report, at least 227 species of reptiles are found in the Western Ghats.[49] The major population of the snake family Uropeltidae is restricted to the region.[50] Several endemic reptile genera and species occur here with the region having a significant population of the mugger crocodiles.[51] The amphibians of the Western Ghats are diverse and unique, with a high proportion of species being endemic to the tropical rainforests of India.[52] New frog species have been continued to be discovered in the 21st century.[53] Frogs of the genera Micrixalus, Indirana and Nyctibatrachus, and the toads Pedostibes, Ghatophryne and Xanthophryne, and arboreal frogs like Ghatixalus, Mercurana and Beddomixalus, and microhylids like Melanobatrachus are endemic to this region.[54]

There are at least 19 species of birds endemic to the Western Ghats including the endangered rufous-breasted laughingthrush, the vulnerable Nilgiri wood-pigeon, white-bellied shortwing and broad-tailed grassbird, the near threatened grey-breasted laughingthrush, black-and-rufous flycatcher, Nilgiri flycatcher, and Nilgiri pipit, and the least concern Malabar (blue-winged) parakeet, Malabar grey hornbill, white-bellied treepie, grey-headed bulbul, rufous babbler, Wayanad laughingthrush, white-bellied blue-flycatcher and the crimson-backed sunbird.[55]

Fishes and molluscs
Denison Barb is endemic to the region

There is a higher fish species richness in the southern part of the Western Ghats. There are 13 genera entirely restricted to the Western Ghats (Betadevario, Dayella, Haludaria, Horabagrus, Horalabiosa, Hypselobarbus, Indoreonectes, Lepidopygopsis, Longischistura, Mesonoemacheilus, Parapsilorhynchus, Rohtee and Travancoria).[56] The most species rich families are the Cyprinids (72 species), hillstream loaches (34 species; including stone loaches, now regarded a separate family), Bagrid catfishes (19 species) and Sisorid catfishes (12 species).[57] The region is home to several brilliantly coloured ornamental fishes like the Denison (or red line torpedo) barb,[58] melon barb, several species of Dawkinsia barbs, zebra loach, Horabagrus catfish, dwarf pufferfish and dwarf Malabar pufferfish.[59] The rivers are also home to Osteobrama bakeri, and larger species such as the Malabar snakehead and Malabar mahseer.[60] A few are adapted to an underground life, including some Rakthamichthys swampeels,[61] and the catfish Horaglanis and Kryptoglanis.[62] Ninetyseven freshwater fish species from the Western Ghats were considered threatened in 2011, including 12 critically endangered, 54 endangered and 31 vulnerable.[56] The reservoirs in the region are important for their commercial and sport fisheries of rainbow trout, mahseer and common carp.[63] There are more than 200 freshwater fish species including 35 also known from brackish or marine water.[64] Several new species have been described from the region since the last decade (e.g., Dario urops and S. sharavathiensis).[65][66]

Tamil lacewing, an endemic butterfly

Seasonal rainfall patterns of the Western Ghats necessitate a period of dormancy for its land snails, resulting in their high abundance and diversity including at least 258 species of gastropods from 57 genera and 24 families.[67] A total of 77 species of freshwater molluscs (52 gastropods and 25 bivalves) have been recorded from the Western Ghats, but the actual number is likely higher.[56] This include 28 endemics. Among the threatened freshwater molluscs are the mussels Pseudomulleria dalyi, which is a Gondwanan relict, and the snail Cremnoconchus, which is restricted to the spray zone of waterfalls.[56] According to the IUCN, 4 species of freshwater molluscs are considered endangered and 3 are vulnerable. An additional 19 species are considered data deficient.[56]

Insects

There are roughly 6,000 insect species.[68] Of the 334 Western Ghats butterfly species, 316 species have been reported to occur in the Nilgiri Biosphere Reserve.[69] The Western Ghats are home to 174 species of odonates (107 dragonflies and 67 damselflies), including 69 endemics.[56] Most of the endemic odonate are closely associated with rivers and streams, while the non-endemics typically are generalists.[56] There are several species of leeches found all along the Western Ghats.[70]

Threats and conservation[edit]

Government of India has established many protected areas. Pictured is Nilgiri Biosphere Reserve, the largest contiguous protected area

Historically, the Western Ghats were covered in dense forests which formed the natural habitat for wildlife along with the native tribal people. Its inaccessibility made it difficult for people from the plains to cultivate the land and build settlements. After the establishment of British colonial rule in the region, large swathes of territory were cleared for agricultural plantations and timber. The forest in the Western Ghats were severely fragmented due to clear-felling for plantations.[71] The introduction of non-native species threatened the rare endemic species and habitat specialists which depleted faster than other species.[72] Complex and species rich habitats like the tropical rainforest are much more adversely affected than other habitats.[73] The primary threats to fauna were from habitat loss, but also from overexploitation, illicit grazing, mining, poaching and introduced species.[56][32]

The Government of India has established many protected areas including two biosphere reserves, 13 national parks to restrict human access, several wildlife sanctuaries to protect specific endangered species and many reserve forests.[74] The Nilgiri Biosphere Reserve, comprising 5,500 km2 (2,100 sq mi) of the forests forms the largest contiguous protected area in the Western Ghats.[75] In August 2011, the Western Ghats Ecology Expert Panel (WGEEP), appointed by the Union Ministry of Environment and Forests to assess the biodiversity and environmental issues of the Western Ghats, designated the entire region as an Ecologically Sensitive Area (ESA) and assigned three levels of Ecological Sensitivity to its different regions.[76][77] Subsequent committees formed recommended various suggestions to protect the region.[78] In 2006, India applied to the UNESCO Man and the Biosphere Programme (MAB) for the Western Ghats to be listed as a protected World Heritage Site.[79] In 2012, the following places were declared as World Heritage Sites:[80][81]

See also[edit]


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External links[edit]

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