Northwestern thorn scrub forest

The Northwestern thorn scrub forests are a xeric shrubland ecoregion of Pakistan and northwestern India, stretching along the border lowlands and hills between the two countries. Once covered in deciduous forest, this ecoregion has been degraded through agriculture and the extraction of timber so that it currently has a scanty covering of thorny scrub dominated by such trees as Acacia senegal, Acacia leucophloea and Prosopis cineraria. Where the soils are particularly saline, there are patches of semi-desert. A number of mammals are found in this habitat and 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 continues.

Location and description

The ecoregion encircles the Thar Desert and Indus Valley Desert ecoregions. It stretches along the border lowlands and hills between India and Pakistan and includes: the western half of Gujarat (excluding the mountain of Girnar), and extending through Rajasthan, where it is bounded on the southeast by the Aravalli Range; most of Haryana and Punjab states of India as well as the Jammu 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's "Thar Desert" Biogeographic province.^[1]

Flora

The Northwestern thorn scrub forests are thought to be tropical dry forests that have been degraded through intensive agriculture and grazing into stunted and open thorn scrub, dominated by trees such as Acacia senegal and Acacia leucophloea, as well as Prosopis cineraria, Capparis zeylandica, and species of Salvadora, Gymnosporia, Grewia, and Gardenia. However the region also contains patches of semi-desert where the soil is particularly saline.^[2]^[3]

Fauna

Despite the large scale forest clearance large mammals still remain in the ecoregion including leopard and their prey such as chinkara (Gazella bennettii) and the threatened species chousingha (Tetracerus quadricornis), and blackbuck (Antilope cervicapra). The scrubland is also home to another large cat, the caracal, which preys on mice, birds, and reptiles. There are two endemic mammals, both bats: Triaenops persicus and the small mouse-tailed bat (Rhinopoma muscatellum) .

There are more than 400 species of birds in the region including the endemic rufous-vented prinia (Prinia burnesii), the near-endemic white-winged tit (Parus nuchalis) and the threatened great Indian bustard (Ardeotis nigriceps) and lesser florican (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 community based in this region extend protection to some wildlife, especially the blackbuck and the tree.

References

↑ "Northwestern thorn scrub forests". Terrestrial Ecoregions. World Wildlife Fund.
↑ Champion, H. G., and S. K. Seth. 1968. A revised survey of the forest types of India. Government of India Press
↑ 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

Ecoregions of India

Tropical and subtropical moist broadleaf forests	Andaman Islands rain forests Brahmaputra Valley semi-evergreen forests Chin Hills-Arakan Yoma montane forests Eastern highlands moist deciduous forests Himalayan subtropical broadleaf forests Lower Gangetic Plains moist deciduous forests Malabar Coast moist forests Maldives-Lakshadweep-Chagos Archipelago tropical moist forests Meghalaya subtropical forests Mizoram-Manipur-Kachin rain forests Nicobar Islands rain forests North Western Ghats moist deciduous forests North Western Ghats montane rain forests Orissa semi-evergreen forests South Western Ghats moist deciduous forests South Western Ghats montane rain forests Sundarbans freshwater swamp forests Upper Gangetic Plains moist deciduous forests

Tropical and subtropical dry broadleaf forests	Central Deccan Plateau dry deciduous forests Chota-Nagpur dry deciduous forests East Deccan dry evergreen forests Kathiarbar-Gir dry deciduous forests Narmada Valley dry deciduous forests Northern dry deciduous forests South Deccan Plateau dry deciduous forests

Tropical and subtropical coniferous forests	Himalayan subtropical pine forests Northeast India-Myanmar pine forests

Temperate broadleaf and mixed forests	Eastern Himalayan broadleaf forests Western Himalayan broadleaf forests

Temperate coniferous forests	Eastern Himalayan subalpine conifer forests Western Himalayan subalpine conifer forests

Tropical and subtropical grasslands, savannas, and shrublands	Terai-Duar savanna and grasslands

Montane grasslands and shrublands	Eastern Himalayan alpine shrub and meadows Karakoram-West Tibetan Plateau alpine steppe Northwestern Himalayan alpine shrub and meadows Western Himalayan alpine shrub and meadows

Flooded grasslands and savannas	Rann of Kutch seasonal salt marsh

Deserts and xeric shrublands	Deccan thorn scrub forests Indus Valley desert Northwestern thorn scrub forests Thar desert

Mangrove	Godavari-Krishna mangroves Indus River Delta-Arabian Sea mangroves Myanmar coast mangroves Sundarbans mangroves

Ecoregions of India

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