Horton Plains 2

The vegetation of the park is classified into two distinctive groups, 2,000 hectares (7.7 sq mi) of wet patana (Sinhalese for "montane grasslands") and 1,160 hectares (4.5 sq mi) of subtropical montane evergreen forests. Nearly 750 species of plants belonging to 20 families have been recorded from the park. The forest canopy reaches the height of 20 metres (66 ft) and features Calophyllum walkeri, forming communities with varieties of Myrtaceae species such as Syzygium rotundifolium, and S. sclerophyllum, and Lauraceae members including Litsea, Cinnamomum, and Actinodaphne speciosa.The undergrowth layer is characterised by Strobilanthes spp. The thickness of the Strobilanthes vegetation hinders the development of a herb layer. Dwarf bamboo species such Indocalamus and Ochlandra also found in the undergrowth layer. Rhodomyrtus tomentosa bushes specially grow in forest margin and near the mountain peaks. Species such as Gordonia and Rhododendron arboreum have spread to Sri Lanka, along the Western Ghats of South India from the Himalayas and are now common. Nearly 54 woody plant species have been recorded from the park, of which 27 (50%) are endemic to Sri Lanka.

Frequent fire and grazing characterises Plagioclimax communities of the grassland flora. Grasslands are dominated by Arundinella villosa and Chrysopogon zeylanicus. Waterlogged swamps or slow moving streams are found in low lying areas, and macrophytes such as Aponogeton jacobsenii, sedge species Isolopis fluitans and Utricularia spp. are found near the slow moving streams. The bamboo Chimonobambusa densifolia thrive along the banks of the streams, and near the swampy areas grass species such as Juncus prismatocarpus, Garnotia mutica, Eriocaulon spp. and Exacum trinervium are common. Tussock grasses such as Chrysopogon zeylanicus and Cymbopogon confertiflorus are found in the wet hollows. Herbaceous flora of the grasslands include temperate species including Ranunculus, Pedicularis, Senecio, Gentiana and Alchemilla and also tropical species such as Eriocaulon and Ipsea speciosa (a rare endemic daffodil orchid). The most widespread boreal herbaceous plants of the park are Viola, Lobelia, Gaultheria, Fragaria, and Plantago.
Tree trunks and branches are ornamented with many species of ferns, Lycopodium, lichens, and orchids. Old man's beard (Usnea barbata) hanging from branches adds to the beauty of the forests. About 16 of the orchid species being endemic. Other notable plants include shrubs such as Rhodomyrtus tomentosa, Gaultheria fragrantissima, herbs, Exacum trinervium, E. walkeri, Drosera indica, and tree ferns Cyathea spp.Anzia, a foliose lichen genus belonging to Parmeliaceae family, which had not been recorded in Sri Lanka previously, was discovered here in 2007.[3] There are conflicting views on how the grasslands of the park came into being, whether man-made or natural. It is now believed that the grasslands on the dry slopes were created by forest clearance and fires while grasslands in low lying areas were naturally created by wet conditions, frost and soil erosion.

Fauna

The vertebrate fauna of the region includes 24 species of mammals, 87 species of birds, nine species of reptiles and eight species of amphibians. The Sri Lankan Elephant disappeared from the region in the 1940s at the latest.At present, the largest and the most commonly seen mammal is the Sambar Deer. Some research findings estimate the population of Sambar Deer to be around 1500 to 2000, possibly more than the carrying capacity of the plains. Other mammal species found in the park include Kelaart's Long-clawed Shrews, Toque Macaques, Purple-faced Langurs, Rusty-spotted Cat, Sri Lankan Leopards, Wild boars, Stripe-necked Mongooses, Sri Lankan Spotted Chevrotains, Indian Muntjacs, and Grizzled giant squirrels. Fishing Cats and European Otters visit the wetlands of the park to prey on aquatic animals. A subspecies of Red Slender Loris, the Horton Plains Slender Loris (Loris tardigradus nycticeboides formerly sometimes considered as Loris lydekkerianus nycticeboides) is found only in highlands of Sri Lanka and is considered one of the world's most endangered primates. In July 2010 a group of researchers from the Zoological Society of London was able to photograph the mammal for the first time.
  Along with Ohiya, Pattipola and Ambewela, Horton Plains forms one of the Important Bird Areas (IBAs) in Sri Lanka.[13] Together with the adjacent Peak Wilderness Sanctuary, Horton Plains contains 21 bird species which occur only on Sri Lanka. Four, Sri Lanka Blue Magpie, Dull-blue Flycatcher, Sri Lanka White-eye, and Sri Lanka Wood Pigeon, occur only in Horton plains, while other endemic species include Sri Lanka Spurfowl, Sri Lanka Junglefowl, Yellow-fronted Barbet, Orange-billed Babbler, Sri Lanka Bush Warbler, and Sri Lanka Whistling-thrush. Many birds migrate here in winter including swiftlets, and Alpine Swift. Crested Serpent Eagle, Mountain Hawk-Eagle, Black-winged Kite, and Peregrine Falcon are among the birds of prey found in Horton Plains. Harriers are among the migratory raptors. This is a key wildlife area. All six highland endemic birds are found here, including Dull-blue Flycatcher, Sri Lanka White-eye, Sri Lanka Wood Pigeon, and Sri Lanka Bush Warbler. Yellow-eared Bulbul and Black-throated Munia are widespread throughout the highlands.  Sri Lanka is considered a herpetological paradise in the world. Possibly about 15 amphibian species inhabit the park. Among them are Microhyla zeylanica, Ramanella palmata, Fejervarya greenii, Rana gracilis, Philautus alto, Philautus femoralis, Philautus frankenbergi, Philautus microtympanum, Philautus schmarda, and Polypedates eques. De Silva has observed six endemic reptiles from the plains. They are Calotes nigrilabris, Rhino Horn Lizard, Cophotis ceylanica, Lankascincus taprobanensis, Common rough-sided snake, and Rat snake. Two fish species found in the park, common carp and rainbow trout; both are introduced species. Horton Plains is also home to many endemic crustaceans including Caridina singhalensis and Perbrinckia species. The endemic freshwater shrimp Caridina singhalensis is found only in streams that have a temperature of less than 15 degrees C and is now restricted to only a stretch of 10 km of one stream.