The Chin Hills-Arakan Yoma montane forests is a tropical and subtropical moist broadleaf forest

ecoregion An ecoregion (ecological region) is an ecological and geographic area that exists on multiple different levels, defined by type, quality, and quantity of environmental resources. Ecoregions cover relatively large areas of land or water, and c ...

in western

Myanmar Myanmar, officially the Republic of the Union of Myanmar; and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and has ...

(Burma). Surrounded at lower elevations by moist tropical forests, this ecoregion is home to a diverse range of subtropical and temperate species, including many species characteristic of the

Himalayas The Himalayas, or Himalaya ( ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the Earth's highest peaks, including the highest, Mount Everest. More than list of h ...

, as well as many

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

species.

Setting

The ecoregion covers an area of , encompassing the

montane forest Montane ecosystems are found on the slopes of mountains. The alpine climate in these regions strongly affects the ecosystem because temperatures lapse rate, fall as elevation increases, causing the ecosystem to stratify. This stratification is ...

s of the

Arakan Mountains The Arakan Mountains, natively referred as Rakhine Yoma () and technically known as the Southern Indo-Burman Range, are a mountain range in western Myanmar, between the coast of Rakhine State and the Central Myanmar Basin, in which flows the Irra ...

. The

Chin Hills The Chin Hills are a range of mountains in Chin State, northwestern Burma (Myanmar), that extends northward into India's Manipur state. Geography The highest peak in the Chin Hills is Khonu Msung, Nat Ma Taung, or Mount Victoria, in southern ...

, which cover most of Burma's

Chin State Chin State (, ) is a state in western Myanmar. Chin State is bordered by Sagaing Division and Magway Division to the east, Rakhine State to the south, the Chattogram Division of Bangladesh to the west, and the Indian states of Mizoram to th ...

, and extend south along the ridge of the Arakan Mountains forms the boundary between

Rakhine State Rakhine State ( ; , ; ), formerly known as Arakan State, is a Administrative divisions of Myanmar, state in Myanmar (Burma). Situated on the western coast, it is bordered by Chin State to the north, Magway Region, Bago Region and Ayeyarwady Re ...

on the west and

Magway Region Magway Region (, ; formerly Magway Division) is an administrative divisions of Myanmar, administrative division in central Myanmar. It is the second largest of Myanmar's seven divisions, with an area of . Pa-de Dam (ပဒဲဆည်) is one of ...

Bago Region Bago Region (, ; formerly Pegu Division and Bago Division) is an administrative divisions of Myanmar, administrative region of Myanmar, located in the southern central part of the country. It is bordered by Magway Region and Mandalay Region to ...

, and

Ayeyarwady Region Ayeyarwady Region ( , , ; formerly Ayeyarwady Division and Irrawaddy Division) is a region of Myanmar, occupying the delta region of the Ayeyarwady River (Irrawaddy River). It is bordered by the Rakhine State to the northwest, the Bago Region to ...

to the east. The ecoregion is bounded by the

Mizoram–Manipur–Kachin rain forests The Mizoram–Manipur–Kachin rain forests is a subtropical moist broadleaf forest ecoregion which occupies the lower hillsides of the mountainous border region joining Bangladesh, China's Yunnan Province, India, and Myanmar. The ecoregion c ...

to the west, north, and northeast, and the

Irrawaddy moist deciduous forests The Irrawaddy moist deciduous forests is a tropical moist broadleaf forest ecoregion in central Myanmar. The ecoregion occupies the central basin of the Irrawaddy River and the lower basin of the Salween River. The ecoregion is characterized by ...

to the east. Two enclaves of Northeast India–Myanmar pine forests lie immediately to the north. The ecoregion includes

Nat Ma Taung Nat Ma Taung (; Khaw-nu-soum or Khonuamthung in Chin language, Chin), also known as Mount Victoria, is the highest mountain in the Chin State of western Myanmar. Geography With a height of above sea level and a prominence of , Nat Ma Taung is o ...

(Mount Victoria) in southern Chin State, which rises to above sea level.

Flora

The plant communities in the ecoregion vary with elevation. Lower montane forests occur below 1000 meters elevation. Dominant canopy trees include '' Bauhinia variegata,

Lagerstroemia speciosa ''Lagerstroemia speciosa'' (giant crepe-myrtle, Queen's crepe-myrtle, banabá plant, or pride of India, or "Queen's Flower" or "Jarul") is a species of ''Lagerstroemia'' native to tropical southern Asia. It is a deciduous tree with bright pink ...

, Derris robusta'', and species of ''

Ficus ''Ficus'' ( or ) is a genus of about 850 species of woody trees, shrubs, vines, epiphytes and hemiepiphytes in the family (biology), family Moraceae. Collectively known as fig trees or figs, they are native throughout the tropics with a few spe ...

Hibiscus ''Hibiscus'' is a genus of flowering plants in the Malva, mallow family, Malvaceae. The genus is quite large, comprising List of Hibiscus species, several hundred species that are Native plant, native to warm temperate, Subtropics, subtropical ...

'', and ''

Strobilanthes ''Strobilanthes'' is a genus of about 350 species of flowering plants in the family (biology), family Acanthaceae, mostly native plant, native to tropical Asia and Madagascar, but with a few species extending north into temperateness, temperate r ...

''.

Liana A liana is a long-Plant stem, stemmed Woody plant, woody vine that is rooted in the soil at ground level and uses trees, as well as other means of vertical support, to climb up to the Canopy (biology), canopy in search of direct sunlight. T ...

s drape the mature forests, especially '' Congea tomentosa'' and ''

Mucuna pruriens ''Mucuna pruriens'' is a tropical legume native to Africa and tropical Asia and widely naturalized and cultivated. Its English common names include monkey tamarind, velvet bean, Bengal velvet bean, Florida velvet bean, Mauritius velvet bean, Yok ...

''. Mixed evergreen broadleaf forest is predominant between 1000 and 2100 meters elevation. Species of

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

''(Quercus),

Castanopsis ''Castanopsis'', commonly called chinquapin or chinkapin, is a genus of evergreen trees belonging to the beech family, Fagaceae. The genus contains about 140 species, which are today restricted to tropical and subtropical eastern Asia. The Engli ...

Eugenia ''Eugenia'' is a genus of flowering plants in the myrtle family Myrtaceae. It has a worldwide, although highly uneven, distribution in tropical and subtropical regions. The bulk of the approximately 1,100 species occur in the New World tropics, ...

Saurauia ''Saurauia'' is a genus of plants in the family Actinidiaceae. It comprises about over 300 species distributed in the tropics and subtropics of Asia and South and Central America. Genetic evidence and the cell biology of the group support monophy ...

, Eriobotrya'', and ''

Schima ''Schima'' is a genus of evergreen trees belonging to the tea family, Theaceae. The genus inhabits warm temperate to subtropical climates across southern and southeastern Asia, from the eastern Himalaya of Nepal and eastern India across Indochin ...

'' are the dominant canopy trees. Montane cloud forests occur above 2000 meters elevation. In the transition zone to the lower-elevation mixed broadleaf evergreen forests, the predominant tree species are typical of the

, including '' Alnus nepalensis, Betula alnoides'', and species of ''

Carpinus Hornbeams are hardwood trees in the plant genus ''Carpinus'' in the family Betulaceae. Its species occur across much of the temperate regions of the Northern Hemisphere. Common names The common English name ''hornbeam'' derives from the hard ...

Prunus ''Prunus'' is a genus of flowering plant, flowering trees and shrubs from the family (biology), family Rosaceae. The genus includes plums, cherries, peaches, nectarines, apricots and almonds (collectively Drupe, stonefruit). The genus has a cosm ...

Pyrus Pears are fruits produced and consumed around the world, growing on a tree and harvested in late summer into mid-autumn. The pear tree and shrub are a species of genus ''Pyrus'' , in the family Rosaceae, bearing the pomaceous fruit of the sa ...

'', and ''

Torreya ''Torreya'' is a genus of conifers comprising six or seven species placed in the family Taxaceae, though sometimes formerly placed in Cephalotaxaceae. Four species are native to eastern Asia; the other two are native to North America. They a ...

''. At higher elevations, species of ''

Castanea The chestnuts are the deciduous trees and shrubs in the genus ''Castanea'', in the beech family Fagaceae. The name also refers to the edible nuts they produce. They are native to temperate regions of the Northern Hemisphere. Description C ...

Cornus ''Cornus'' is a genus of about 30–60 species of woody plants in the family Cornaceae, commonly known as dogwoods or cornels, which can generally be distinguished by their blossoms, berries, and distinctive bark. Most are deciduous ...

, Eriobotrya, Laurus'', and ''

Taxus ''Taxus'' is a genus of coniferous trees or shrubs known as yews in the family Taxaceae. Yews occur around the globe in temperate zones of the northern hemisphere, northernmost in Norway and southernmost in the South Celebes. Some populations ex ...

'' become more common.

Epiphyte An epiphyte is a plant or plant-like organism that grows on the surface of another plant and derives its moisture and nutrients from the air, rain, water (in marine environments) or from debris accumulating around it. The plants on which epiphyt ...

s grow abundantly on the trees in the montane cloud forests, common epiphytes include species of ''

Aeschynanthus ''Aeschynanthus'' is a genus of about 150 species of evergreen subtropics, subtropical and tropics, tropical plants in the family (biology), family Gesneriaceae. They are usually trailing epiphytes with brightly colored flowers that are pollinate ...

'' and ''

Agapetes ''Agapetes'' (Gk. ἀγαπητός (agapetos) = 'beloved') is a semi-climbing shrub genus native to the Himalayas, grown as an ornamental for its attractive pendulous bunches of red tubular flowers blooming over a long period. It is mostly grow ...

, Rhododendron cuffeanum'', aroids, and the

orchid Orchids are plants that belong to the family Orchidaceae (), a diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Orchids are cosmopolitan plants that are found in almost every habitat on Eart ...

s ''

Dendrobium ''Dendrobium'' is a genus of mostly Epiphyte, epiphytic and Lithophyte, lithophytic orchids in the Family (biology), family Orchidaceae. It is a very large genus, containing more than 1,800 species that are found in diverse habitats throughout m ...

'' and '' Pleione''. The tree '' Lithocarpus xylocarpus'' is common between 2,400 and 2,750 meters elevation. '' Rhododendron arboreum'' and '' Quercus semecarpifolia'' are dominant above 2,750 meters elevation. Above 3000 meters elevation on Nat Ma Taung, shrub forests of '' Hypericum patulum'' and '' Rhododendron burmanicum'' occur, with herbaceous plants including species of ''

Aconitum ''Aconitum'' (), also known as aconite, monkshood, wolfsbane, leopard's bane, devil's helmet, or blue rocket, is a genus of over 250 species of flowering plants belonging to the family (biology), family Ranunculaceae. These herbaceous perennial ...

Lactuca ''Lactuca'', commonly known as lettuce, is a genus of flowering plants in the family Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia. Its best-known representative is the garden lettuce ...

, Pedicularis'', and '' Veronica''. Some summit ridges are covered in a temperate shrub savanna, with shrub species of ''

Rhododendron ''Rhododendron'' (; : ''rhododendra'') is a very large genus of about 1,024 species of woody plants in the Ericaceae, heath family (Ericaceae). They can be either evergreen or deciduous. Most species are native to eastern Asia and the Himalayan ...

Buddleja ''Buddleja'' (; ''Buddleia''; also historically given as ''Buddlea'') is a genus comprising over 140 species of flowering plants endemicity, endemic to Asia, Africa, and the Americas. The generic name bestowed by Carl Linnaeus, Linnaeus posthu ...

Daphne Daphne (; ; , , ), a figure in Greek mythology, is a naiad, a variety of female nymph associated with fountains, wells, springs, streams, brooks and other bodies of freshwater. There are several versions of the myth in which she appears, but t ...

, Leycesteria'', and ''

Lonicera Honeysuckles are arching shrubs or twining vines in the genus ''Lonicera'' () of the family Caprifoliaceae. The genus includes 158 species native to northern latitudes in North America, Eurasia, and North Africa. Widely known species include ...

'' interspersed among tall grasses and herbs including species of ''Aconitum,

Delphinium ''Delphinium'' is a genus of about 300 species of annual and perennial flowering plants in the family (biology), family Ranunculaceae, native species, native throughout the Northern Hemisphere and also on the high mountains of tropical Africa. T ...

Geranium ''Geranium'' is a genus of 422 species of annual, biennial, and perennial plants that are commonly known as geraniums or cranesbills. They are found throughout the temperate regions of the world and the mountains of the tropics, with the gre ...

'', and ''

Thalictrum ''Thalictrum'' () is a genus of 120-200 species of herbaceous perennial flowering plants in the buttercup family, Ranunculaceae, native mostly to temperate regions. Meadow-rue is a common name for plants in this genus. ''Thalictrum'' is a taxon ...

''.

Fauna

The ecoregion is home to several threatened and endangered mammals, including the

hoolock gibbon The hoolock gibbons are three primate species of genus ''Hoolock'' in the gibbon family, Hylobatidae, native to eastern Bangladesh, Northeast India, Myanmar, and Southwest China. Description Hoolocks are the second-largest of the gibbons, after ...

(''Hylobates hoolock''),

tiger The tiger (''Panthera tigris'') is a large Felidae, cat and a member of the genus ''Panthera'' native to Asia. It has a powerful, muscular body with a large head and paws, a long tail and orange fur with black, mostly vertical stripes. It is ...

(''Panthera tigris''),

leopard The leopard (''Panthera pardus'') is one of the five extant cat species in the genus ''Panthera''. It has a pale yellowish to dark golden fur with dark spots grouped in rosettes. Its body is slender and muscular reaching a length of with a ...

(''Panthera pardus''),

clouded leopard The clouded leopard (''Neofelis nebulosa''), also called mainland clouded leopard, is a wild cat inhabiting dense forests from the foothills of the Himalayas through Northeast India and Bhutan to mainland Southeast Asia into South China. It w ...

(''Pardofelis nebulosa''),

sun bear The sun bear (''Helarctos malayanus'') is a bear species in the Family (biology), family Ursidae found in the tropical forests of Southeast Asia. It is the only species in the genus ''Helarctos'' and the smallest bear species, standing nearly ...

(''Ursus malayanus''),

Eld's deer Eld's deer (''Rucervus eldii'' or ''Panolia eldii''Pitraa, Fickela, Meijaard, Groves (2004). ''Evolution and phylogeny of old world deer.'' Molecular Phylogenetics and Evolution 33: 880–895.), also known as the thamin or brow-antlered deer, i ...

or thamin (''Cervus eldii''), and

gaur The gaur (''Bos gaurus''; ) is a large bovine native to the Indian Subcontinent and Southeast Asia, and has been listed as Vulnerable species, Vulnerable on the IUCN Red List since 1986. The global population was estimated at a maximum of 21,000 ...

(''Bos gaurus''). There are no endemic mammals. Three bird species are endemic to the ecoregion – the striped laughingthrush (''Trochalopteron virgatus''), brown-capped laughingthrush (''Trochalopteron austeni''), and white-browed nuthatch (''Sitta victoriae'').

Conservation

A 2017 assessment found that , or 6%, of the ecoregion is in

protected area Protected areas or conservation areas are locations which receive protection because of their recognized natural or cultural values. Protected areas are those areas in which human presence or the exploitation of natural resources (e.g. firewood ...

s. Protected areas include Bwe Par Taung National Park and Natmataung National Park.Chin Hills-Arakan Yoma montane forests
. DOPA Explorer. Accessed 9 May 2022. Another 84% of the ecoregion is forested outside protected areas.

References

External links

* {{DEFAULTSORT:Chin Hills-Arakan Yoma montane forests Ecoregions of Myanmar * Forests of Myanmar Montane forests Indomalayan ecoregions Tropical and subtropical moist broadleaf forests