Explore Orang National Park, Assam’s “Mini Kaziranga,”. Learn about its geography, biodiversity, one-horned rhinos, tiger reserve status and conservation initiatives. Important for APSC ( Prelims & Mains ).
Introduction
Often referred to as the “Mini Kaziranga” due to its striking landscape resemblance, population mix, and marshy ecosystems, Orang National Park is a critical rhinocerotic and tiger habitat located on the northern bank of the Brahmaputra River.
Administrative & Spatial Profile
- Location: Situated on the northern bank of the Brahmaputra River, spanning across the Darrang and Sonitpur districts of Assam.
- Size: It is one of Assam’s smaller national parks, covering a compact core area of approximately 78.81 sq.km to 79.28 sq.km.
- Tiger Reserve Status: Functions as the primary core zone of the larger Orang Tiger Reserve.
Legal Status & Naming Timeline
- Pre-1900: Inhabited by local tribes who completely abandoned the area following a devastating epidemic disease.
- 31 May 1915: Declared as the Orang Game Reserve by British colonial authorities
- 20 September 1985: Established as a Wildlife Sanctuary.
- 1992: Renamed the Rajiv Gandhi Wildlife Sanctuary, but this designation was reversed due to intense public opposition.
- 13 April 1999: Officially upgraded and notified as a National Park.
Geography, Hydrology & Terrain
River Boundaries:
- Dhansiri River – Western boundary.
- Pachnoi River – Eastern boundary.
- Belsiri River – Adjacent to the park landscape.
All rivers ultimately drain into the Brahmaputra River.
- Alluvial Terraces: Terrain slopes gently north–south (45–70 m elevation).
- Lower Terrace: Recent alluvium along riverbanks and flood channels.
- Upper Terrace: Older alluvium, separated by a prominent east–west high bank.
Wetlands:
- Seasonal flooding sustains a dynamic floodplain.
- Contains 12 natural beels and 26 artificial water bodies.
Habitat Types and Vegetation
- Part of the Indo-Burma Biodiversity Hotspot.
- Grasslands (>60% of area): Dominant habitat comprising savannah, wet alluvial, and degraded grasslands.
- Key species: Phragmites karka, Arundo donax, Imperatacylindrica, Saccharum spp.
- Moist Deciduous Forests (~15.85 km²): Eastern Himalayan moist deciduous vegetation.
- Key species: Bombax ceiba (Simolu), Dalbergia sissoo (Sissoo), Sterculia villosa, Trewianudiflora, Ziziphus jujuba.
- Swamps & Waterbodies (~15.2 km²): Seasonal swamp forests and open-water ecosystems.
- Key species: Ipomoea aquatica, Enhydra fluctuans, Nymphaea spp.
- Major invasive: Eichhornia spp. (Water Hyacinth).
Faunal Complexities & Keystone Mammals
- “Big Four” Stronghold: Supports breeding populations of the Indian One-Horned Rhinoceros, Bengal Tiger, Asian Elephant, and Wild Water Buffalo.
- Pygmy Hog Conservation Site: Important reintroduction habitat for the Critically Endangered Pygmy Hog, one of the world’s rarest wild pigs.
- Aquatic Apex Fauna: The adjacent Brahmaputra River channels support the endangered Gangetic Dolphin.
- Other Notable Mammals: Indian Pangolin, Hog Deer, Wild Boar, Smooth-coated Otter, Fishing Cat, Leopard Cat, Jungle Cat, and Small Indian Civet.
Ornithological Eminence
- Important Bird Area (IBA): Recognized by BirdLife International as an Important Bird and Biodiversity Area.
- Wet-Grassland Bird Hotspot: Among Assam’s three premier IBAs and a key wet-grassland bird site of the Indo-Gangetic Plain; records 222 bird species.
- Bengal Florican Stronghold: Supports over 1% of the global population of the Critically Endangered Bengal Florican, making it one of the species’ most important habitats worldwide.
- Other Threatened Birds: Swamp Francolin, Spot-billed Pelican, Great White Pelican, Black-necked Stork, Greater Adjutant, Lesser Adjutant, Pallas’s Fish Eagle, and Ruddy Shelduck.
Conservation Initiatives & Threat Landscape
- Human Pressure: Dense settlements around the park drive encroachment, habitat disturbance, and human-wildlife conflict.
- Poaching Crisis: Intensive poaching (1991-2000) reduced rhino numbers to 48, prompting a tri-district anti-poaching coordination mechanism.
- Rhino Vision India (RVI): Joint initiative of the Assam Government, WWF-India, International Rhino Foundation, Zoo Basel, and WAZA to secure and expand rhino populations.
- Tiger Monitoring: In partnership with Aaranyak, camera traps and GIS-based monitoring are used under a Species Survival Plan (SSP) to track tigers and reduce human-tiger conflict.
About Lucent IAS
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Publications From LUCENT IAS
- “The Assam Odyssey: The Complete Assam Centric Resource useful for APSC CCE and various other Departmental Examinations. Read More
- InExam PYQ Explained.Read More
- Mains Tattva: The Craft of Answer Writing (GS Paper PYQs). Read More
- Maanchitra – An Illustrative Colour-Coded Informative Map of Assam. Read More
- প্ৰাৰম্ভ (Prarambha). Read More
- অসম ওডিচী – The Assam Odyssey (Assamese Edition). Read More
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