The Northwestern thorn scrub forests, presently known as Aravalli west thorn scrub forests, is a

xeric shrubland Deserts and xeric shrublands are a biome defined by the World Wide Fund for Nature. Deserts and xeric (ancient Greek xērós, “dry") shrublands form the largest terrestrial biome, covering 19% of Earth's land surface area. Ecoregions in this ...

ecoregion An ecoregion (ecological region) or ecozone (ecological zone) is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than a biogeographic realm. Ecoregions cover relatively large areas of ...

Pakistan Pakistan ( ur, ), officially the Islamic Republic of Pakistan ( ur, , label=none), is a country in South Asia. It is the world's fifth-most populous country, with a population of almost 243 million people, and has the world's second-lar ...

and

Northern India North India is a loosely defined region consisting of the northern part of India. The dominant geographical features of North India are the Indo-Gangetic Plain and the Himalayas, which demarcate the region from the Tibetan Plateau and Central ...

, stretching along the border lowlands and hills between the two countries. Once covered in deciduous forest, this ecoregion has been degraded through

agriculture Agriculture or farming is the practice of cultivating plants and livestock. Agriculture was the key development in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that enabled people t ...

and the extraction of

timber Lumber is wood that has been processed into dimensional lumber, including beams and planks or boards, a stage in the process of wood production. Lumber is mainly used for construction framing, as well as finishing (floors, wall panels, w ...

so that it currently has a scanty covering of thorny scrub dominated by such trees as ''

Acacia senegal ''Senegalia senegal'' (also known as ''Acacia senegal'') is a small thorny deciduous tree from the genus '' Senegalia'', which is known by several common names, including gum acacia, gum arabic tree, Sudan gum and Sudan gum arabic. In parts of I ...

'', ''

Acacia leucophloea ''Vachellia leucophloea'' ( hi, रेवंजा), also called ''reonja'', is a moderate-sized tree native to South and Southeast Asia. Distribution ''Vachellia leucophloea'' grows natively in India, Nepal, Pakistan, Sri Lanka, Myanmar, Thail ...

'' and ''

Prosopis cineraria ''Prosopis cineraria'', also known as ghaf, is a species of flowering tree in the pea family, Fabaceae. It is native to arid portions of Western Asia and the Indian Subcontinent, including Afghanistan, Bahrain, Iran, India, Oman, Pakistan, Sau ...

''. Where the soils are particularly saline, there are patches of semi-desert. A number of mammals are found in this habitat, including about four hundred species of bird. Some small areas are protected but the collection of firewood and the conversion of the land to

subsistence farming Subsistence agriculture occurs when farmers grow food crops to meet the needs of themselves and their families on smallholdings. Subsistence agriculturalists target farm output for survival and for mostly local requirements, with little or no su ...

continues.

Location and description

The ecoregion encircles the

Thar Desert The Thar Desert, also known as the Great Indian Desert, is an arid region in the north-western part of the Subcontinent that covers an area of and forms a natural boundary between India and Pakistan. It is the world's 20th-largest desert, a ...

and Indus Valley Desert ecoregions. It stretches along the border lowlands and hills between India and Pakistan and includes: the western half of

Gujarat Gujarat (, ) is a state along the western coast of India. Its coastline of about is the longest in the country, most of which lies on the Kathiawar peninsula. Gujarat is the fifth-largest Indian state by area, covering some ; and the ninth ...

(excluding the mountain of

Girnar Girnar is an ancient hill in Junagadh, Gujarat, India. Geology Mount Girnar is a major igneous plutonic complex which intruded into the basalts towards the close of the Deccan Trap period. The rock types identified in this complex are ga ...

), and extending through Rajasthan, where it is bounded on the southeast by the

Aravalli Range The Aravalli Range (also spelled ''Aravali'') is a mountain range in Northern- Western India, running approximately in a south-west direction, starting near Delhi, passing through southern Haryana, Rajasthan, and ending in Ahmedabad Gujarat. ...

; most of

Haryana Haryana (; ) is an Indian state located in the northern part of the country. It was carved out of the former state of East Punjab on 1 Nov 1966 on a linguistic basis. It is ranked 21st in terms of area, with less than 1.4% () of India's land a ...

and

Punjab Punjab (; Punjabi: پنجاب ; ਪੰਜਾਬ ; ; also romanised as ''Panjāb'' or ''Panj-Āb'') is a geopolitical, cultural, and historical region in South Asia, specifically in the northern part of the Indian subcontinent, comprising a ...

states of India as well as the

Jammu Jammu is the winter capital of the Indian union territory of Jammu and Kashmir. It is the headquarters and the largest city in Jammu district of the union territory. Lying on the banks of the river Tawi, the city of Jammu, with an area of ...

region of Jammu and Kashmir, extending to the foothills of the Himalayas; in Pakistan, most of Punjab province, extending into easternmost Northwest Frontier and Baluchistan provinces and western Sindh. This ecoregion, together with the Thar Desert and Indus Valley Desert ecoregions, form

Miklos Udvardy Miklos Dezso Ferenc Udvardy (March 23, 1919 – January 27, 1998) was a Hungarian-American biologist and university instructor. He contributed to a wide variety of disciplines, such as biogeography, evolutionary biology, ornithology, and veget ...

's "Thar Desert"

Biogeographic province This page features a list of biogeographic provinces that were developed by Miklos Udvardy in 1975,Udvardy, M. D. F. (1975). ''A classification of the biogeographical provinces of the world''. IUCN Occasional Paper no. 18. Morges, Switzerland: IUCN ...

Climate

The climate of the ecoregion consists of '' Hot semi-arid'' (

Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...

(BSh)) and ''Arid'' (

(

BWh Bust/waist/hip measurements (informally called 'body measurements' or ′vital statistics′) are a common method of specifying clothing sizes. They match the three inflection points of the female body shape. In human body measurement, these t ...

)) climates. This climate is characteristic of steppes, grasslands, and forests. The temperature includes, hot summers and cool or dry winters. Precipitation averages 500–600 mm/year with heavy rainfalls and evening thunderstorms with the possibility of cloudbursts and flash floods in the monsoon season, late July–August. This being said, it only receives enough rainfall to support scrub. It does not receive enough rainfall to feature in the humid subtropical climate.

Flora

The Northwestern thorn scrub forests are thought to be

tropical dry forests The tropical and subtropical dry broadleaf forest is a habitat type defined by the World Wide Fund for Nature and is located at tropical and subtropical latitudes. Though these forests occur in climates that are warm year-round, and may receive ...

that have been degraded through

intensive agriculture Intensive agriculture, also known as intensive farming (as opposed to extensive farming), conventional, or industrial agriculture, is a type of agriculture, both of crop plants and of animals, with higher levels of input and output per unit of ag ...

and

grazing In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to roam around and consume wild vegetations in order to convert the otherwise indigestible (by human gut) cellulose within grass and other ...

into stunted and open thorn scrub, dominated by trees such as ''

'' and ''

'', as well as ''

'', ''

Capparis zeylanica ''Capparis zeylanica'' is a climbing shrub common in the forests of the Indian subcontinent, Indo-China, China and Malesia; no subspecies are listed in the Catalogue of Life. Several species of Lepidoptera Lepidoptera ( ) is an order of ins ...

'', and species of '' Salvadora'', ''

Gymnosporia ''Gymnosporia'' is an Old World genus of plants, that comprise suffrutices, shrubs and trees. It was formerly considered congeneric with ''Maytenus'', but more recent investigations separated it based on the presence of achyblasts (truncated br ...

'', ''

Grewia ''Grewia'' is a large flowering plant genus in the mallow family Malvaceae, in the expanded sense as proposed by the Angiosperm Phylogeny Group. Formerly, Grewia was placed in either the family Tiliaceae or the Sparrmanniaceae. However, these ...

,'' and '' Gardenia''. However the region also contains patches of semi-desert where the soil is particularly saline.Puri, G.S., Gupta, R.K., and Meher-Homji, V.M.P.S. 1989. Forest Ecology Volume 2. New Delhi, India: Oxford & IBH Publishing Company

Fauna

Despite the large scale

forest clearance Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated d ...

large mammals still remain in the ecoregion including leopard and their prey such as

chinkara The chinkara (''Gazella bennettii''), also known as the Indian gazelle, is a gazelle species native to Iran, Afghanistan, Pakistan and India. Taxonomy The following six subspecies are considered valid: * Deccan chinkara (''G. b. bennettii'') ...

(''Gazella bennettii'') and the threatened species

chousingha The four-horned antelope (''Tetracerus quadricornis''), or ''chousingha'', is a small antelope found in India and Nepal. Its four horns distinguish it from most other bovids, which have two horns (with a few exceptions, such as the Jacob sheep) ...

(''Tetracerus quadricornis''), and

blackbuck The blackbuck (''Antilope cervicapra''), also known as the Indian antelope, is an antelope native to India and Nepal. It inhabits grassy plains and lightly forested areas with perennial water sources. It stands up to high at the shoulder. Ma ...

(''Antilope cervicapra''). The scrubland is also home to another large cat, the

caracal The caracal (''Caracal caracal'') () is a medium-sized wild cat native to Africa, the Middle East, Central Asia, and arid areas of Pakistan and northwestern India. It is characterised by a robust build, long legs, a short face, long tufted e ...

, which preys on mice, birds, and reptiles. There are two endemic mammals, both bats: ''

Triaenops persicus The rufous trident bat, Persian trident bat, or triple nose-leaf bat (''Triaenops persicus'') is a species of bat in the genus '' Triaenops''. It occurs in southwestern Pakistan, southern Iran, the United Arab Emirates, Oman, and Yemen. In the la ...

'' and the small mouse-tailed bat (''Rhinopoma muscatellum''). There are more than 400 species of birds in the region including the endemic rufous-vented grass babbler (''Laticilla burnesii''), the near-endemic white-winged tit (''Parus nuchalis'') and the threatened

great Indian bustard The great Indian bustard (''Ardeotis nigriceps'') or Indian bustard, is a bustard found on the Indian subcontinent. A large bird with a horizontal body and long bare legs, giving it an ostrich like appearance, this bird is among the heaviest of t ...

(''Ardeotis nigriceps'') and

lesser florican The lesser florican (''Sypheotides indicus''), also known as the likh or ''kharmore'', is the smallest in the bustard family and the only member of the genus ''Sypheotides''. It is endemic to the Indian Subcontinent where it is found in tall gras ...

(''Eupodotis indica'').

Threats and preservation

Over 90% of the ecoregion has been converted to human use, and the remaining habitat is highly fragmented. There are many protected areas but they are very small and unconnected and even these are liable to invasion for firewood collecting and clearance for planting. However the traditions of the

Bishnoi Bishnoi (also known as Vishnoi) is a community found in the Western Thar Desert and northern states of India. They follow a set of 29 principles/commandments given by Guru Jambheshwar (also known as Guru Jambhoji, Guru Jambha Ji) (1451-1536) ...

community based in this region extend protection to some wildlife, especially the blackbuck and the tree.

References

{{Ecoregions of India Thar Desert Deserts and xeric shrublands Ecoregions of India Ecoregions of Pakistan Environment of Rajasthan Geography of Punjab, Pakistan Geography of Rajasthan Indomalayan ecoregions

Location and description

Climate

Flora

Fauna

Threats and preservation

See also

References