Sky islands are
isolated mountain
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher t ...
s surrounded by radically different
lowland
Upland and lowland are conditional descriptions of a plain based on elevation above sea level. In studies of the ecology of freshwater rivers, habitats are classified as upland or lowland.
Definitions
Upland and lowland are portions of ...
environments. The term originally referred to those found on the
Mexican Plateau, and has extended to similarly isolated
high-elevation forests. The isolation has significant implications for these natural habitats. The
American Southwest
The Southwestern United States, also known as the American Southwest or simply the Southwest, is a geographic and cultural region of the United States that generally includes Arizona, New Mexico, and adjacent portions of California, Colorado, N ...
region began warming up between and 10,000 years
BP and
atmospheric temperature
Atmospheric temperature is a measure of temperature at different levels of the Earth's atmosphere. It is governed by many factors, including incoming solar radiation, humidity and altitude. When discussing surface air temperature, the annual at ...
s increased substantially, resulting in the formation of vast
desert
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one ...
s that isolated the sky islands.
Endemism
Endemism is the state of a species being found 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 found else ...
,
altitudinal migration
Altitudinal migration is a short-distance animal migration from lower altitudes to higher altitudes and back. Altitudinal migrants change their elevation with the seasons making this form of animal migration seasonal. Altitudinal migration can be m ...
, and
relict
A relict is a surviving remnant of a natural phenomenon.
Biology
A relict (or relic) is an organism that at an earlier time was abundant in a large area but now occurs at only one or a few small areas.
Geology and geomorphology
In geology, a r ...
populations are some of the natural phenomena to be found on sky islands.
The complex dynamics of
species richness
Species richness is the number of different species represented in an ecological community, landscape or region. Species richness is simply a count of species, and it does not take into account the abundances of the species or their relative a ...
on sky islands draws attention from the discipline of
biogeography
Biogeography is the study of the distribution of species and ecosystems in geographic space and through geological time. Organisms and biological communities often vary in a regular fashion along geographic gradients of latitude, elevatio ...
, and likewise the
biodiversity
Biodiversity or biological diversity is the variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic ('' genetic variability''), species ('' species diversity''), and ecosystem (''ecosystem diversity'') ...
is of concern to
conservation biology
Conservation biology is the study of the conservation of nature and of Earth's biodiversity with the aim of protecting species, their habitats, and ecosystems from excessive rates of extinction and the erosion of biotic interactions. It is an in ...
. One of the key elements of a sky island is separation by physical distance from the other mountain ranges, resulting in a habitat island, such as a forest surrounded by desert.
Some sky islands serve as
refugia for boreal species stranded by warming climates since the
last glacial period. In other cases, localized populations of plants and animals tend towards
speciation
Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed to anagenesis, phyletic evolution within ...
, similar to oceanic islands such as the
Galápagos Islands
The Galápagos Islands ( Spanish: , , ) are an archipelago of volcanic islands. They are distributed on each side of the equator in the Pacific Ocean, surrounding the centre of the Western Hemisphere, and are part of the Republic of Ecuador ...
of
Ecuador
Ecuador ( ; ; Quechuan languages, Quechua: ''Ikwayur''; Shuar language, Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechuan ...
.
Etymology
Herpetologist
Edward H. Taylor presented the concept of "Islands" on the Mexican Plateau in 1940 at the 8th American Scientific Congress in Washington, D. C. and his abstract on the topic was later published in 1942.
[Taylor, Edward Harrison. 1942. ''"Island" faunas on the Mexican Plateau.'' Proceedings of the 8th American Scientific Congress 3: 503-504.]
The sky island concept was latter applied 1943 when Natt N. Dodge, in an article in ''
Arizona Highways'' magazine, referred to the
Chiricahua Mountains
The Chiricahua Mountains massif is a large mountain range in southeastern Arizona which is part of the Basin and Range province of the west and southwestern United States and northwest Mexico; the range is part of the Coronado National Forest. T ...
in southeastern Arizona as a "mountain island in a desert sea".
In about the same era, the term was used to refer to high alpine, unglaciated, ancient topographic landform surfaces on the crest of the
Sierra Nevada
The Sierra Nevada () is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primarily ...
, California.
The term was popularized by nature writer Weldon Heald, a resident of southeastern Arizona. In his 1967 book, ''Sky Island'', he demonstrated the concept by describing a drive from the town of
Rodeo, New Mexico, in the western
Chihuahuan desert
The Chihuahuan Desert ( es, Desierto de Chihuahua, ) is a desert ecoregion designation covering parts of northern Mexico and the southwestern United States. It occupies much of far West Texas, the middle to lower Rio Grande Valley and the lower ...
, to a peak in the Chiricahua Mountains, away and higher in elevation, ascending from the hot, arid desert, to grasslands, then to oak-pine woodland, pine forest, and finally to spruce-fir-aspen forest. His book mentions the concept of
biome
A biome () is a biogeographical unit consisting of a biological community that has formed in response to the physical environment in which they are found and a shared regional climate. Biomes may span more than one continent. Biome is a broader ...
, but prefers the terminology of
life zones, and makes reference to the work of
Clinton Hart Merriam
Clinton Hart Merriam (December 5, 1855 – March 19, 1942) was an American zoologist, mammalogist, ornithologist, entomologist, ecologist, ethnographer, geographer, naturalist and physician. He was commonly known as the 'father of mammalogy', a ...
. The book also describes the wildlife and living conditions of the Chiricahuas.
Around the same time, the idea of mountains as islands of habitat took hold with scientists and has been used by such popular writers as
David Quammen
David Quammen (born February 24, 1948) is an American science, nature, and travel writer and the author of fifteen books. His articles have appeared in '' Outside Magazine'', ''National Geographic'', '' Harper's'', ''Rolling Stone'', ''The New Yor ...
and
John McPhee
John Angus McPhee (born March 8, 1931) is an American writer. He is considered one of the pioneers of creative nonfiction. He is a four-time finalist for the Pulitzer Prize in the category General Nonfiction, and he won that award on the fourth ...
. This concept falls within the study of
island biogeography Insular biogeography or island biogeography is a field within biogeography that examines the factors that affect the species richness and diversification of isolated natural communities. The theory was originally developed to explain the pattern of ...
. It is not limited to mountains in southwestern North America but can be applied to mountains, highlands, and massifs around the world.
Characteristics
The
Madrean sky islands
The Madrean Sky Islands are enclaves of Madrean pine–oak woodlands, found at higher elevations in a complex of small mountain ranges in southern and southeastern Arizona, southwestern New Mexico, and northwestern Mexico. The sky islands are sur ...
are probably the most studied sky islands in the world. Found in the U.S. states of
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe
, LargestCity = Albuquerque
, LargestMetro = Tiguex
, OfficialLang = None
, Languages = English, Spanish ( New Mexican), Navajo, ...
and
Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fo ...
and the Mexican states of
Chihuahua and
Sonora
Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Federal Entities of Mexico. The state is divided into 72 municipalities; the ...
, these numerous mountains form links in a chain connecting the northern end of the
Sierra Madre Occidental and the southern
Colorado Plateau
The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. This province covers an area ...
. Sky islands of the central and northern mountains in the United States are often called
island ranges, especially by populations within view of such islands of mountains surrounded by plains such as those found within the
Wichita Mountains
The Wichita Mountains are located in the southwestern portion of the U.S. state of Oklahoma. It is the principal relief system in the Southern Oklahoma Aulacogen, being the result of a failed continental rift. The mountains are a northwest-south ...
of
southwestern Oklahoma
Southwest Oklahoma is a geographical name for the southwest portion of the state of Oklahoma, typically considered to be south of the Canadian River, extending eastward from the Texas
Texas (, ; Spanish language, Spanish: ''Texas'', ''T ...
.
Some more northerly examples are the
Crazy Mountains,
Castle Mountains,
Bears Paw Mountains
The Bears Paw Mountains (Bear Paw Mountains, Bear's Paw Mountains or Bearpaw Mountains) are an insular-montane island range in the Central Montana Alkalic Province in north-central Montana, United States, located approximately 10 miles south o ...
,
Highwood Mountains, and
Little Rocky Mountains, all in the US state of
Montana
Montana () is a state in the Mountain West division of the Western United States. It is bordered by Idaho to the west, North Dakota and South Dakota to the east, Wyoming to the south, and the Canadian provinces of Alberta, British Colu ...
. Each of these ranges is forested and has tundra and snowpack above treeline, but is not connected to any other range by forested ridges; the ranges are completely surrounded by treeless prairie and/or semi-arid scrubland below. Other well-known sky islands of North America are the
Great Basin
The Great Basin is the largest area of contiguous endorheic basin, endorheic watersheds, those with no outlets, in North America. It spans nearly all of Nevada, much of Utah, and portions of California, Idaho, Oregon, Wyoming, and Baja California ...
montane forests, such as the
White Mountains in California, and the
Spring Mountains
The Spring Mountains are a mountain range of Southern Nevada in the United States, running generally northwest–southeast along the west side of Las Vegas and south to the border with California. Most land in the mountains is owned by the Uni ...
near
Las Vegas, Nevada
Las Vegas (; Spanish for "The Meadows"), often known simply as Vegas, is the 25th-most populous city in the United States, the most populous city in the state of Nevada, and the county seat of Clark County. The city anchors the Las Ve ...
. One of the unique aspects of the sky islands of the
U.S.-Mexico border region is the mix of floristic affinities, that is, the trees and plants of higher elevations are more characteristic of northern latitudes, while the flora of the lower elevations has ties to the desert and the mountains further south. Some unique plants and animals are found in these sky islands, such as the
mountain yucca,
Mount Graham red squirrel
The Mount Graham red squirrel (''Tamiasciurus fremonti grahamensis'') is an endangered subspecies of the southwestern red squirrel (''Tamiasciurus fremonti'') native to the Pinaleño Mountains of Arizona. It is smaller than most other subspeci ...
,
Huachuca springsnail, and
Jemez Mountains salamander.
Some montane species apparently evolved within their current range, adapting to their local environment, such as the
Mount Lyell shrew. However, it has also been noted that some isolated mountain ecosystems have a tendency to lose species over time, perhaps because small, insularized populations are vulnerable to the forces of
extinction
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed an ...
, and the isolation of the habitat reduces the possibility of
colonization
Colonization, or colonisation, constitutes large-scale population movements wherein migrants maintain strong links with their, or their ancestors', former country – by such links, gain advantage over other inhabitants of the territory. When ...
by new species.
Furthermore, some species, such as the
grizzly bear
The grizzly bear (''Ursus arctos horribilis''), also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America.
In addition to the mainland grizzly (''Ursus arctos horr ...
, require a range of habitats. These bears historically made use of the forests and meadows found in the Madrean sky islands, as well as lower-elevation habitats such as
riparian zone
A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks a ...
s. (Grizzlies were extirpated from the region in the 20th century.) Seasonal movements between highland and lowland habitats can be a kind of migration, such as that undertaken by the
mountain quail of the Great Basin mountains. These birds live in high elevations when free of snow, and instead of migrating south for the winter, they migrate ''down''.
Confusing the matter somewhat is the potential for an archipelago of sky islands or even the valleys between them to act not only as a barrier to
biological dispersal
Biological dispersal refers to both the movement of individuals (animals, plants, fungi, bacteria, etc.) from their birth site to their breeding site ('natal dispersal'), as well as the movement from one breeding site to another ('breeding dis ...
, but also as a path for migration. Examples of birds and mammals making use of the Madrean archipelago to extend their ranges northward are the
elegant trogon and
white-nosed coati.
List by terrestrial realms
Afrotropical realm
The Afrotropical realm is one of Earth's eight biogeographic realms. It includes Africa south of the Sahara Desert, the majority of the Arabian Peninsula, the island of Madagascar, southern Iran and extreme southwestern Pakistan, and the isla ...
*
Cal Madow
*
Cameroonian Highlands forests
The Cameroonian Highlands forests, also known as the Cameroon Highlands forests, are a montane tropical moist broadleaf forest ecoregion located on the range of mountains that runs inland from the Gulf of Guinea and forms the border between Came ...
*
Ethiopian Highlands
The Ethiopian Highlands is a rugged mass of mountains in Ethiopia in Northeast Africa. It forms the largest continuous area of its elevation in the continent, with little of its surface falling below , while the summits reach heights of up to . ...
*
Highlands of southern Africa
*
Green Mountain of
Ascension Island
Ascension Island is an isolated volcanic island, 7°56′ south of the Equator in the South Atlantic Ocean. It is about from the coast of Africa and from the coast of South America. It is governed as part of the British Overseas Territory ...
*
Guinea Highlands
**
Nimba Range
*
Mount Cameroon and Bioko montane forests
The Mount Cameroon and Bioko montane forests is a tropical moist broadleaf forest ecoregion in central Africa. It occupies the upper slopes of coastal Mount Cameroon in Cameroon, and the mountains of nearby Bioko island in Equatorial Guinea.
G ...
*
Mount Kilimanjaro
Mount Kilimanjaro () is a dormant volcano in Tanzania. It has three volcanic cones: Kibo, Mawenzi, and Shira. It is the highest mountain in Africa and the highest free-standing mountain above sea level in the world: above sea level and ab ...
*
Mount Gorongosa
*
Rwenzori Mountains
The Ruwenzori, also spelled Rwenzori and Rwenjura, are a range of mountains in eastern equatorial Africa, located on the border between Uganda and the Democratic Republic of the Congo. The highest peak of the Ruwenzori reaches , and the range' ...
Australasian realm
The Australasian realm is a biogeographic realm that is coincident with, but not (by some definitions) the same as, the geographical region of Australasia. The realm includes Australia, the island of New Guinea (comprising Papua New Guinea and t ...
*
Mount Wilhelm
Mount Wilhelm (german: Wilhelmsberg) is the highest mountain in Papua New Guinea at . It is part of the Bismarck Range and the peak is the point where three provinces, Chimbu, Jiwaka and Madang, meet. The peak is also known as ''Enduwa Kombugl ...
*
Mount Taranaki
Mount Taranaki (), also known as Mount Egmont, is a dormant stratovolcano in the Taranaki region on the west coast of New Zealand's North Island. It is the second highest point in the North Island, after Mount Ruapehu. The mountain has a seco ...
*
Waitakere Ranges
Indomalayan realm
The Indomalayan realm is one of the eight biogeographic realms. It extends across most of South and Southeast Asia and into the southern parts of East Asia.
Also called the Oriental realm by biogeographers, Indomalaya spreads all over the Indi ...
*
Mount Jerai
*
Fansipan
*
Jade Mountain
*
Mount Kinabalu
Mount Kinabalu ( ms, Gunung Kinabalu, Dusun: ''Gayo Ngaran or Nulu Nabalu'') is the highest mountain in Borneo and Malaysia. With an elevation of , it is third-highest peak of an island on Earth, and 20th most prominent mountain in the worl ...
*
Nat Ma Taung
Nat Ma Taung ( my, နတ်မတောင်; Khaw-nu-soum or Khonuamthung in Chin), also known as Mount Victoria, is the highest mountain in the Chin State of western Burma.
Geography
With a height of above sea level and a prominence of , N ...
*
Central Highlands (Vietnam)
Central Highlands ( vi, Cao nguyên Trung phần), Western Highlands ( vi, Tây Nguyên) or Midland Highlands ( vi, Cao nguyên Trung bộ) is one of the regions of Vietnam. It contains the provinces of Đắk Lắk, Đắk Nông, Gia Lai, ...
*
Titiwangsa Mountains
The Titiwangsa Mountains ( Malay: ''Banjaran Titiwangsa,'' بنجرن تيتيوڠسا, ), also known as ''"Banjaran Besar"'' (Big Range) by locals, is the chain of mountains that forms the backbone of the Malay Peninsula.
The northern section o ...
*
Western Ghats
Nearctic realm
The Nearctic realm is one of the eight biogeographic realms constituting the Earth's land surface.
The Nearctic realm covers most of North America, including Greenland, Central Florida, and the highlands of Mexico. The parts of North America ...
*
Animas Mountains
The Animas Mountains are a small mountain range in Hidalgo County, within the " Boot-Heel" region of far southwestern New Mexico, in the United States. They extend north–south for about 30 miles (50 km) along the Continental Divide,Since ...
*
Black Range
Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have o ...
*
Capitan Mountains
*
Chisos Mountains
The Chisos Mountains, also known as the Chisos, are a mountain range located in the Big Bend area of the Trans-Pecos region of Texas, United States. The mountain system covers 40 square miles (104 square km) and is contained entirely within the ...
*
Colorado Plateau's San Francisco Peaks
*
Chuska Mountains
''
The Chuska Mountains are an elongate range on the southwest Colorado Plateau and within the Navajo Nation whose highest elevations approach 10,000 feet. The range is about 80 by 15 km (50 by 10 miles). It trends north-northwest and is cross ...
*
Great Basin montane forests
*
Davis Mountains
The Davis Mountains, originally known as Limpia Mountains, are a range of mountains in West Texas, located near Fort Davis, after which they are named. The fort was named for then United States Secretary of War and later Confederate President J ...
*
Guadalupe Mountains
The Guadalupe Mountains ( es, Sierra de Guadalupe) are a mountain range located in West Texas and southeastern New Mexico. The range includes the highest summit in Texas, Guadalupe Peak, , and the "signature peak" of West Texas, El Capitan, bo ...
*
San Jacinto Mountains
The San Jacinto Mountains (''Avii Hanupach''Munro, P., et al. ''A Mojave Dictionary''. Los Angeles: UCLA. 1992. in Mojave) are a mountain range in Riverside County, located east of Los Angeles in southern California in the United States. The ...
*
Madrean sky islands
The Madrean Sky Islands are enclaves of Madrean pine–oak woodlands, found at higher elevations in a complex of small mountain ranges in southern and southeastern Arizona, southwestern New Mexico, and northwestern Mexico. The sky islands are sur ...
*
Manzano Mountains
The Manzano Mountains are a small mountain range in the central part of the US State of New Mexico. They are oriented north–south and are 30 miles long. The center of the range lies due east of the town of Belen. The name "Manzano" is Span ...
*
Mogollon Mountains
*
Oscura Mountains
*
Olympic Mountains
The Olympic Mountains are a mountain range on the Olympic Peninsula of the Pacific Northwest of the United States. The mountains, part of the Pacific Coast Ranges, are not especially high – Mount Olympus is the highest at ; however, the east ...
*
Peloncillo Mountains
*
Quartz Mountains
*
Sacramento Mountains
*
San Augustin Mountains
*
Sandia Mountains
The Sandia Mountains (Southern Tiwa: ''Posu gai hoo-oo'', Keres: ''Tsepe,'' Navajo: ''Dził Nááyisí''; Tewa: ''O:ku:p’į'', Northern Tiwa: ''Kep’íanenemą''; Towa: ''Kiutawe'', Zuni: ''Chibiya Yalanne'') are a mountain range located ...
*
Spring Mountains
The Spring Mountains are a mountain range of Southern Nevada in the United States, running generally northwest–southeast along the west side of Las Vegas and south to the border with California. Most land in the mountains is owned by the Uni ...
*
Mount Taylor Volcano
*
Wichita Mountains
The Wichita Mountains are located in the southwestern portion of the U.S. state of Oklahoma. It is the principal relief system in the Southern Oklahoma Aulacogen, being the result of a failed continental rift. The mountains are a northwest-south ...
Neotropical realm
The Neotropical realm is one of the eight biogeographic realms constituting Earth's land surface. Physically, it includes the tropical terrestrial ecoregions of the Americas and the entire South American temperate zone.
Definition
In biog ...
*
Baja California
Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Me ...
**
Sierra de la Laguna
The Sierra de la Laguna is a mountain range at the southern end of the Baja California Peninsula in Mexico, and is the southernmost range of the Peninsular Ranges System.
It is located in La Paz Municipality and Los Cabos Municipality of sou ...
**
Sierra de Juarez
**
Sierra San Pedro Mártir
Sierra (Spanish for "mountain range" and " saw", from Latin '' serra'') may refer to the following:
Places Mountains and mountain ranges
* Sierra de Juárez, a mountain range in Baja California, Mexico
* Sierra de las Nieves, a mountain rang ...
*
Cordillera of Central America
*
Tepui
A tepui , or tepuy (), is a table-top mountain or mesa found in South America, especially in Venezuela and western Guyana. The word tepui means "house of the gods" in the native tongue of the Pemon, the indigenous people who inhabit the Gran ...
s
*
Serra do Mar
*
Hispaniolan mountain ranges
**
Baoruco Mountain Range,
Dominican Republic
The Dominican Republic ( ; es, República Dominicana, ) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region. It occupies the eastern five-eighths of the island, which it shares with ...
**
Cordillera Central, Dominican Republic
**
Massif de la Hotte
The Massif de la Hotte is a mountain range in southwestern Haiti, on the Tiburon Peninsula. About 2.5 million years ago, Massif de la Hotte was separated from the Massif de la Selle by a deep, wide sea channel, and formed a separate island. This ...
,
Haiti
Haiti (; ht, Ayiti ; French: ), officially the Republic of Haiti (); ) and formerly known as Hayti, is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean Sea, east of Cuba and Jamaica, an ...
**
Chaîne de la Selle
Chaîne de la Selle is a mountain range in Haiti, on the island of Hispaniola.
The range's Pic la Selle is the highest point of Haiti, at a height of 2,680 meters (8,793 feet) above sea level
Mean sea level (MSL, often shortened to sea l ...
, Haiti
*
Sierra de Tamaulipas
The Sierra de Tamaulipas is an isolated, semi-tropical mountain range in the Mexican state of Tamaulipas. Its highest point is . There are no cities or towns in the Sierra and the small population is largely agricultural. The higher elevations o ...
*
Venezuelan Coastal Range
The Venezuelan Coastal Range ( es, Cordillera de la Costa or ), also known as Venezuelan Caribbean Mountain System ( es, Sistema Montañoso Caribe) is a mountain range system and one of the eight natural regions of Venezuela, that runs along the ...
Palearctic realm
The Palearctic or Palaearctic is the largest of the eight biogeographic realms of the Earth. It stretches across all of Eurasia north of the foothills of the Himalayas, and North Africa.
The realm consists of several bioregions: the Euro-Sibe ...
*
Aïr Mountains
The Aïr Mountains or Aïr Massif ( tmh, Ayăr; Hausa: Eastern ''Azbin'', Western ''Abzin'') is a triangular massif, located in northern Niger, within the Sahara. Part of the West Saharan montane xeric woodlands ecoregion, the ...
*
Altai Mountains
The Altai Mountains (), also spelled Altay Mountains, are a mountain range in Central and East Asia, where Russia, China, Mongolia and Kazakhstan converge, and where the rivers Irtysh and Ob have their headwaters. The massif merges with the ...
*
Baikal Mountains
*
Caucasus
The Caucasus () or Caucasia (), is a region between the Black Sea and the Caspian Sea, mainly comprising Armenia, Azerbaijan, Georgia, and parts of Southern Russia. The Caucasus Mountains, including the Greater Caucasus range, have historicall ...
*
Tibesti Mountains
The Tibesti Mountains are a mountain range in the central Sahara, primarily located in the extreme north of Chad, with a small portion located in southern Libya. The highest peak in the range, Emi Koussi, lies to the south at a height of an ...
*
Tien Shan
The Tian Shan,, , otk, 𐰴𐰣 𐱅𐰭𐰼𐰃, , tr, Tanrı Dağı, mn, Тэнгэр уул, , ug, تەڭرىتاغ, , , kk, Тәңіртауы / Алатау, , , ky, Теңир-Тоо / Ала-Тоо, , , uz, Tyan-Shan / Tangritog‘ ...
See also
*
Altitudinal zonation
Altitudinal zonation (or elevational zonation) in mountainous regions describes the natural layering of ecosystems that occurs at distinct elevations due to varying environmental conditions. Temperature, humidity, soil composition, and solar radi ...
*
Life zone
*
Holdridge life zones
The Holdridge life zones system is a global bioclimatic scheme for the classification of land areas. It was first published by Leslie Holdridge in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving ob ...
*
Inselberg
An inselberg or monadnock () is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain.
In Southern Africa a similar formation of granite is known as a koppie ...
or monadnock
*
List of life zones by region
*
Refugium (population biology)
Refugium, plural refugia, the Latin for "refuge" or "hideaway", may refer to:
* Refugium (fishkeeping), an appendage to a marine, brackish, or freshwater fish tank that shares the same water supply
* Refugium (population biology), a location of a ...
*
Table (landform)
A table or tableland is a butte, flank of a mountain, or mountain, that has a flat top.
This kind of landform has numerous names, including:
* Butte
* Mesa
*
* Potrero
* Tepui
* Terrace
* Tuya
A tuya is a flat-topped, steep-sided v ...
*
Tepui
A tepui , or tepuy (), is a table-top mountain or mesa found in South America, especially in Venezuela and western Guyana. The word tepui means "house of the gods" in the native tongue of the Pemon, the indigenous people who inhabit the Gran ...
References
{{reflist, 2
External links
Sky Island Alliance homepageSky Islands Traverse long-distance hiking route
Biogeography
Biodiversity
Endemism
Madrean Sky Islands mountain ranges
Montane ecology
Mountain ranges
Landforms