India is the world's 8th most biodiverse region with a 0.46 BioD score on diversity index, 102,718 species of fauna and 23.39% of the nation's geographical area under forest and tree cover in 2020.[1] India encompasses a wide range of biomes: desert, high mountains, highlands, tropical and temperate forests, swamplands, plains, grasslands, areas surrounding rivers, as well as island archipelago. Officially, four out of the 36 Biodiversity Hotspots in the world are present in India: the Himalayas, the Western Ghats, the Indo-Burma and the Nicobar Islands. To these may be added the Sundarbans and the Terrai-Duar Savannah grasslands for their unique foliage and animal species.[2] These hotspots have numerous endemic species.[3] Nearly 5% of India's total area is formally classified under protected areas .
India, for the most part, lies within the Indomalayan realm, with the upper reaches of the Himalayas forming part of the Palearctic realm; the contours of 2000 to 2500m are considered to be the altitudinal boundary between the Indo-Malayan and Palearctic zones. India displays significant biodiversity. One of seventeen megadiverse countries, it is home to 7.6% of all mammalian, 12.6% of all avian, 6.2% of all reptilian, 4.4% of all amphibian and 11.7% of all fish.
The region is also heavily influenced by summer monsoons that cause major seasonal changes in vegetation and habitat. India forms a large part of the Indomalayan biogeographical zone and many of the floral and faunal forms show Malayan affinities with only a few taxa being unique to the Indian region. The unique forms include the snake family Uropeltidae found only in the Western Ghats and Sri Lanka. Fossil taxa from the Cretaceous show links to the Seychelles and Madagascar chain of islands.[4] The Cretaceous fauna include reptiles, amphibians and fishes and an extant species demonstrating this phylogeographical link is the purple frog. The separation of India and Madagascar is traditionally estimated to have taken place about 88 million years ago. However, there are suggestions that the links to Madagascar and Africa were present even at the time when the Indian subcontinent met Eurasia. India has been suggested as a ship for the movement of several African taxa into Asia. These taxa include five frog families (including the Myobatrachidae), three caecilian families, a lacertid lizard and freshwater snails of the family Pomatiopsidae.[5] A thirty million-year-old Oligocene-era fossil tooth from the Bugti Hills of central Pakistan has been identified as from a lemur-like primate, prompting controversial suggestions that the lemurs may have originated in Asia.[6][7] Lemur fossils from India in the past led to theories of a lost continent called Lemuria. This theory however was dismissed when continental drift and plate tectonics became well established.
India is home to several well-known large mammals, including the Asian elephant, Bengal tiger, Asiatic lion, Indian leopard and Indian rhinoceros. Some of these animals are engrained in Indian culture, often being associated with deities. These large mammals are important for wildlife tourism in India, with several national parks and wildlife sanctuaries catering to these needs. The popularity of these charismatic animals has greatly helped conservation efforts in India. The tiger has been particularly important, and Project Tiger, started in 1972, was a major effort to conserve the tiger and its habitats.[8] Project Elephant, though less known, started in 1992 and works for elephant protection.[9] Most of India's rhinos today survive in the Kaziranga National Park.
Some other well-known large Indian mammals are ungulates such as the water buffalo, nilgai, gaur and several species of deer and antelope. Some members of the dog family such as the Indian wolf, Bengal fox, golden jackal and the dhole or wild dogs are also widely distributed. It is also home to the striped hyena. Many smaller animals such as macaques, langurs and mongoose species are especially well known due to their ability to live close to or inside urban areas.
The majority of conservation research attention on wildlife in India is focused within protected areas, though there is considerable wild fauna outside such reserves including in farmlands and in cities.[10][11][12]
The Zoological Survey of India (ZSI), with its headquarters in Kolkata (the capital of West Bengal) and 16 regional stations is responsible for surveying the faunal resources of India. Possessing a tremendous diversity of climate and physical conditions, India has a great variety of fauna, numbering 89,451 species.
Depletion of vegetative cover due to expansion of agriculture, habitat destruction, over-exploitation, pollution, introduction of toxic imbalance in community structure, epidemics, floods, droughts and cyclones, contribute to the loss of flora and fauna. More than 39 species of mammals, 72 species of birds, 17 species of reptiles, three species of amphibians, two species of fish, and a large number of butterflies, moth, and beetles are considered vulnerable and endangered.[13]
India is listed 12th among the mega-biodiverse nations in the world with a BioD score of 0.46 on the diversity index"which is calculated by its percentage of species in each group relative to the total global number of species in each group". With 23.39% of its geographical area under forest and tree cover, India is rich in biodiversity. A 2020 faunal survey of India by the Zoological Survey of India (ZSI) reported a total of 102,718 species of fauna, with 557 new species including 407 newly described species and 150 new country records. Among the new finds, 486 species were invertebrates (mostly insects), and 71 were vertebrate species, mostly fishes and reptiles. New species were reported from Karnataka (66 species), Kerala (51), Rajasthan (46) and West Bengal (30). From 2010 to 2020, 4,112 species, including 2,800 new species and 1,312 new records, were added to the Indian fauna.[1]
There are about 2,546 species of fishes (about 11% of the world species) found in Indian waters. About 197 species of amphibians (4.4% of the world total) and more than 408 reptile species (6% of the world total) are found in India. Among these groups the highest levels of endemism are found in the amphibians.
There are about 1361 species of birds recorded from India, with some variations, depending on taxonomic treatments, accounting for about 12% of the world species.[14]
There are about 410 species of mammals known from India, which is about 8.86% of the world species.[15]
India has the greatest number of cat species in the world.[16]
The Western Ghats are a chain of hills that run along the western edge of peninsular India. Their proximity to the ocean and through orographic effect, they receive high rainfall. These regions have moist deciduous forest and rain forest. The region shows high species diversity as well as high levels of endemism. Nearly 77% of the amphibians and 62% of the reptile species found here are found nowhere else.[17] The region shows biogeographical affinities to the Malayan region, and the Satpura hypothesis proposed by Sunder Lal Hora suggests that the hill chains of Central India may have once formed a connection with the forests of northeastern India and into the Indo-Malayan region. Hora used torrent stream fishes to support the theory, but it was also suggested to hold for birds.[18] Later studies have suggested that Hora's original model species were a demonstration of convergent evolution rather than speciation by isolation.[17]
More recent phylogeographic studies have attempted to study the problem using molecular approaches.[19] There are also differences in taxa which are dependent on time of divergence and geological history.[20] Along with Sri Lanka this region also shows some fauna similarities with the Madagascan region especially in the reptiles and amphibians. Examples include the Sinophis snakes, the purple frog and Sri Lankan lizard genus Nessia which appears similar to the Madagascan genus Acontias.[21] Numerous floral links to the Madagascan region also exist.[22] An alternate hypothesis that these taxa may have originally evolved out-of-India has also been suggested.[23]
Bio geographical quirks exist with some taxa of Malayan origin occurring in Sri Lanka but absent in the Western Ghats. These include insects groups such as the plants such as those of the genus Nepenthes.
The Eastern Himalayas
The Eastern Himalayas is the region encompassing Bhutan, northeastern India, West Bengal, and southern, central and eastern Nepal. The region is geologically young and shows high altitudinal variation. It has nearly 163 globally threatened species including the one-horned rhinoceros (Rhinoceros unicornis), the Wild Asian water buffalo (Bubalus bubalis (Arnee)) and in all 45 mammals, 50 birds, 17 reptiles, 12 amphibians, 3 invertebrate and 36 plant species.[24][25] The Dooars forest in the Terai is a biologically diverse area, with Himalayan biodiversity as well as tropical biodiversity. The relict dragonfly (Epiophlebia laidlawi) is an endangered species found here with the only other species in the genus being found in Japan. The region is also home to the Himalayan newt (Tylototriton verrucosus), the only salamander species found within Indian limits.[26]
Extinct and fossil forms
During the early Tertiary period, the Indian tableland, what is today peninsular India, was a large island. Prior to becoming an island, it was connected to the African region. During the tertiary period, this island was separated from the Asian mainland by a shallow sea. The Himalayan region and the greater part of Tibet lay under this sea. The movement of the Indian subcontinent into the Asian landmass created the great Himalayan ranges and raised the sea bed into, what is today, the plains of northern India.
Once connected to the Asian mainland, many species moved into India. The Himalayas were created in several upheavals. The Siwaliks were formed at the last and the largest number of fossils of the Tertiary period are found in these ranges.[27]
Many fossil tree species have been found in the intertrappean beds,[28] including Grewioxylon from the Eocene and Heritieroxylon keralensis from the middle Miocene in Kerala and Heritieroxylon arunachalensis from the Mio-Pliocene of Arunachal Pradesh and at many other places. The discovery of Glossopteris fern fossils from India and Antarctica led to the discovery of Gondwanaland and led to the greater understanding of continental drift. Fossil Cycads[29] are known from India while seven Cycad species continue to survive in India.[30][31]
Titanosaurus indicus was perhaps the first dinosaur discovered in India by Richard Lydekker in 1877 in the Narmada valley. This area has been one of the most important areas for paleontology in India. Another dinosaur known from India is Rajasaurus narmadensis,[32] a heavy-bodied and stout carnivorous abelisaurid (theropod) dinosaur that inhabited the area near present-day Narmada river. It was 9 m in length and 3 m in height and somewhat horizontal in posture with a double-crested crown on the skull.
Some fossil snakes from the Cenozoic era are also known.[33]
Some scientists have suggested that the Deccan lava flows and the gases produced were responsible for the global extinction of dinosaurs. However, these have been disputed.[34][35]
Himalayacetus subathuensis, the oldest-known whale fossil of the family Protocetidae (Eocene), about 53.5 million years old was found in the Simla hills in the foothills of the Himalayas. This area was underwater (in the Tethys sea) during the Tertiary period (when India was an island off Asia). This whale may have been capable of living partly on land.[36][37] Other fossil whales from India include Remingtonocetus approximately 43-46 million years old.
Several small mammal fossils have been recorded in the intertrappean beds, however larger mammals are mostly unknown. The only major primate fossils have been from the nearby region of Myanmar.
The exploitation of land and forest resources by humans along with hunting and trapping for food and sport has led to the extinction of many species in India in recent times.[citation needed]
Probably the first species to vanish during the time of the Indus Valley civilisation was the species of wild cattle, Bos primegenius nomadicus or the wild zebu, which vanished from its range in the Indus valley and western India, possibly due to inter-breeding with domestic cattle and resultant fragmentation of wild populations due to loss of habitat.[38]
Notable mammals which became or are presumed extinct within the country itself include the Indian / Asiatic cheetah, Javan rhinoceros and Sumatran rhinoceros.[39] While some of these large mammal species are confirmed extinct, there have been many smaller animal and plant species whose status is harder to determine. Many species have not been seen since their description. Hubbardia heptaneuron, a species of grass that grew in the spray zone of the Jog Falls prior to the construction of the Linganamakki reservoir, was thought to be extinct but a few were rediscovered near Kolhapur.[40]
Sanjay Gandhi National Park is an 87 km2 (34 sq mi) protected area in Mumbai, Maharashtra. It was established in 1969 with its headquarters situated at Borivali.
The Nilgiri Biosphere Reserve is a biosphere reserve in the Nilgiri Mountains of the Western Ghats in South India. It is the largest protected forest area in India, spreading across Tamil Nadu, Karnataka and Kerala. It includes the protected areas Mudumalai National Park, Mukurthi National Park, Sathyamangalam Wildlife Sanctuary in Tamil Nadu; Nagarhole National Park, Bandipur National Park, both in Karnataka; Silent Valley National Park, Aralam Wildlife Sanctuary, Wayanad Wildlife Sanctuary, and Karimpuzha Wildlife Sanctuary in Kerala.
Periyar National Park and Wildlife Sanctuary (PNP) is a protected area located in the districts of Pathanamthitta and Idukki in Kerala, India. It is a renowned Elephant and Tiger reserve. The protected area encompasses 925 km2 (357 sq mi), of which 305 km2 (118 sq mi) of the main zone was declared as the Periyar National Park in 1982. The park is a repository of rare, endemic, and endangered flora and fauna and forms the major watershed of two important rivers of Kerala: the Periyar and the Pamba.
Eravikulam National Park is a 97 km2 national park located along the Western Ghats in the Idukki and Ernakulam districts of Kerala in India. The park is situated between 10º05'N and 10º20' north, and 77º0' and 77º10' east and is the first national park in Kerala. It was established in 1978.
Rajaji National Park is a national park and tiger reserve in the Indian state of Uttarakhand. that encompasses the Shivaliks, near the foothills of the Himalayas. It covers 820 km2 (320 sq mi) and is included in three districts of Uttarakhand—Haridwar, Dehradun and Pauri Garhwal. In 1983, three wildlife sanctuaries in the area were merged into one.
Namdapha National Park is a 1,985 km2 (766 sq mi) large national park in Arunachal Pradesh of Northeast India. The park was established in 1983. With more than 1,000 floral and about 1,400 faunal species, it is a biodiversity hotspot in the Eastern Himalayas. It harbours the northernmost lowland evergreen rainforests in the world at 27°N latitude. It also harbours extensive dipterocarp forests, comprising the northwestern parts of the Mizoram-Manipur-Kachin rain forests ecoregion.
Manas National Park is a national park, Project Tiger reserve, and an elephant reserve in Assam, India. Located in the Himalayan foothills, it borders the Royal Manas National Park in Bhutan. The park is known for its rare and endangered endemic wildlife such as the Assam roofed turtle, hispid hare, golden langur and pygmy hog. It also hosts the only known population of pygmy hogs in the world. Manas is also famous for its population of the wild water buffalo. Because of its exceptional biodiversity, scenery, and variety of habitats, Manas National Park is a biosphere reserve and a UNESCO World Heritage Site.
India is one of the most biodiverse regions and is home to a large variety of wildlife. It is one of the 17 megadiverse countries and includes three of the world's 36 biodiversity hotspots – the Western Ghats, the Eastern Himalayas, and the Indo-Burma hotspot.
Kaziranga National Park is an Indian national park and a World Heritage Site in Golaghat and Nagaon districts of Assam, India. It is refuge for the world's largest population of great one-horned rhinoceros. Kaziranga has the highest density of tigers among protected areas in the world and was declared a Tiger Reserve in 2006. The park has large breeding populations of elephant, wild Asiatic water buffalo and swamp deer. Kaziranga is recognized as an Important Bird Area by Birdlife International for conservation of avifaunal species. The park has achieved notable progress in wildlife conservation with respect to other protected areas in India.Kaziranga was declared a Tiger Reserve in 2006
The state of Karnataka in South India has a rich diversity of flora and fauna. It has a recorded forest area of 38,720 km2 which constitutes 55 of the geographical area of the state. These forests support 25% of the elephant population and 20% of the tiger population of India. Many regions of Karnataka are still unexplored and new species of flora and fauna are still found. The mountains of the Western Ghats in the western region of Karnataka are a biodiversity hotspot. Two sub-clusters of the Western Ghats, Talacauvery and Kudremukh, are on a tentative list of sites that could be designated as World Heritage Sites by UNESCO. The Bandipur and Nagarahole national parks which fall outside these subclusters were included in the Nilgiri biosphere reserve in 1986, a UNESCO designation. In the Biligiriranga Hills the Eastern Ghats meet the Western Ghats. The state bird and state animal of Karnataka are Indian roller and the Indian elephant. The state tree and state flower are sandalwood and lotus. Karnataka is home to 524 tigers.
There are more than 2000 species of fauna that can be found in Tamil Nadu. This rich wildlife is attributed to the diverse relief features as well as favorable climate and vegetation in the Indian state. Recognizing the state's role in preserving the current environment, the state government has established several wildlife and bird sanctuaries as well as national parks, which entail stringent protective measures. Tamil Nadu is also included in the International Network of Biosphere Reserves, which facilitates international recognition and additional funding. There are five national parks and 17 sanctuaries that serve as homes to the wildlife.
Land of the Tiger is a BBC nature documentary series exploring the natural history of the Indian subcontinent, first transmitted in the UK on BBC Two in 1997. The production team covered the breadth and depth of India, from the Himalayan mountains in the north to the reef-fringed islands of the Indian Ocean, to capture footage of the country's wild places and charismatic wildlife.
The wildlife of Pakistan comprises a diverse flora and fauna in a wide range of habitats from sea level to high elevation areas in the mountains, including 195 mammal, 668 bird species and more than 5000 species of Invertebrates. This diverse composition of the country's fauna is associated with its location in the transitional zone between two major zoogeographical regions, the Palearctic, and the Oriental. The northern regions of Pakistan, which include Khyber Pakhtunkhwa and Gilgit Baltistan include portions of two biodiversity hotspot, Mountains of Central Asia and Himalayas.
Pakistan's native fauna reflect its varied climatic zones. The northern Pakistan, which includes Khyber Pakhtunkhwa and Gilgit Baltistan, has portions of two biodiversity hotspots, Mountains of Central Asia and Himalayas.
Dehing Patkai National Park is a national park in the Dibrugarh and Tinsukia districts of Assam covering an area of 231.65 km2 (89.44 sq mi) of rainforest. It was declared a wildlife sanctuary on 13 June 2004. On 13 December 2020, the Government of Assam upgraded it into a national park. On 9 June 2021, the Forest Department of Assam officially notified it as a national park. It is located in the Dehing Patkai Landscape which is a dipterocarp-dominated lowland rainforest. The rainforest stretches for more than 575 km2 (222 sq mi) in the districts of Dibrugarh, Tinsukia and Charaideo. The forest further spreads over in the Tirap and Changlang districts of Arunachal Pradesh. Dehing Patkai National Park harbours the largest stretch of lowland rainforests in India. Dehing Patkai Wildlife Sanctuary was declared as Dehing Patkai Elephant Reserve under Project Elephant. Dehing-Patkai as a potential wildlife sanctuary was identified in late 1980s during a primate survey as "Upper Dehing Wildlife Sanctuary". Subsequently during a study on white-winged wood duck in early 1990s, it was discovered as a globally important site for this duck and recommended to be upgraded to "Upper Dehing National Park".
Raimona National Park is located in extreme western part of Assam, India. It is spread across Gossaigaon and Kokrajhar subdivisions of Kokrajhar district of Bodoland Territorial Region.
↑ Jean-Claude Rage (2003) Relationships of the Malagasy fauna during the Late Cretaceous: Northern or Southern routes? Acta Palaeontologica Polonica 48(4):661-662 PDFArchived 14 December 2004 at the Wayback Machine
↑ Briggs, JC (2003) The biogeographic and tectonic history of India. Journal of Biogeography, 30:381–388
↑ Marivaux L., Welcome J.-L., Antoine P-O., Métais G., Baloch I.M., Benammi M., Chaimanee Y., Ducrocq S., and Jaeger J.-J. (2001) A fossil lemur from the Oligocene of Pakistan. Science, 294: 587–591.
↑ Rage J.-C., Bajpai S., Thewissen J. G. M. & Tiwari B. N. 2003. Early Eocene snakes from Kutch, Western India, with a review of the Palaeophiidae. Geodiversitas 25 (4): 695-716 PDFArchived 21 February 2012 at the Wayback Machine
↑ Bajpai, S. and Gingerich P.D. (1998) A new Eocene archaeocete (Mammalia, Cetacea) from India and the time of origin of whales Proc. Natl. Acad. Sci. USA 95:15464–15468 PDFArchived 22 December 2005 at the Wayback Machine
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