desertic /di zerr"tik/, adj.desertlike, adj.
/dez"euhrt/, n.
1. a region so arid because of little rainfall that it supports only sparse and widely spaced vegetation or no vegetation at all: The Sahara is a vast sandy desert.
2. any area in which few forms of life can exist because of lack of water, permanent frost, or absence of soil.
3. an area of the ocean in which it is believed no marine life exists.
4. (formerly) any unsettled area between the Mississippi and the Rocky Mountains thought to be unsuitable for human habitation.
5. any place lacking in something: The town was a cultural desert.
6. of, pertaining to, or like a desert; desolate; barren.
7. occurring, living, or flourishing in the desert: a desert tribe; a desert palm.
8. designed or suitable for wear in the desert, as cool, protective clothing: a big, wide-brimmed desert hat.
[1175-1225; ME < AF < LL desertum (neut.), n. use of ptp. of L deserere to abandon, forsake, equiv. to de- DE- + serere to join together (in a line); cf. SERIES]
Syn. 1. DESERT, WASTE, WILDERNESS refer to areas that are largely uninhabited. DESERT emphasizes lack of water; it refers to a dry, barren, treeless region, usually sandy: an oasis in a desert. WASTE emphasizes lack of inhabitants and of cultivation; it is used of wild, barren land: a desolate waste. WILDERNESS emphasizes the difficulty of finding one's way, whether because of barrenness or of dense vegetation: a trackless wilderness.
desertedly, adv.desertedness, n.deserter, n.
/di zerrt"/, v.t.
1. to leave (a person, place, etc.) without intending to return, esp. in violation of a duty, promise, or the like: He deserted his wife.
2. (of military personnel) to leave or run away from (service, duty, etc.) with the intention of never returning.
3. to fail (someone) at a time of need: None of his friends had deserted him.
4. to forsake or leave one's duty, obligations, etc. (sometimes fol. by from, to, etc.): Many deserted during the food shortage.
5. (of military personnel) to leave service, duty, etc., with no intention of returning: Troops were deserting to the enemy.
[1470-80; < MF déserter < LL desertare, freq. of L deserere; see DESERT1]
Syn. 1. DESERT, ABANDON, FORSAKE mean to leave behind persons, places, or things. DESERT implies intentionally violating an oath, formal obligation, or duty: to desert campaign pledges. ABANDON suggests giving up wholly and finally, whether of necessity, unwillingly, or through shirking responsibilities: to abandon a hopeless task; abandon a child. FORSAKE has emotional connotations, since it implies violating obligations of affection or association: to forsake a noble cause.
/di zerrt"/, n.
1. Often, deserts. reward or punishment that is deserved: to get one's just deserts.
2. the state or fact of deserving reward or punishment.
3. the fact of deserving well; merit; virtue.
[1275-1325; ME < OF deserte, n. use of fem. ptp. of deservir to DESERVE]
Syn. 3. See merit.

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Large, extremely dry area of land with fairly sparse vegetation.

It is one of the Earth's major types of ecosystems. Areas with a mean annual precipitation of 10 in. (250 mm) or less are generally considered deserts. They include the high-latitude circumpolar areas as well as the more familiar hot, arid regions of the low and mid-latitudes. Desert terrain may consist of rugged mountains, high plateaus, or plains; many occupy broad mountain-rimmed basins. Surface materials include bare bedrock, plains of gravel and boulders, and vast tracts of shifting sand. Wind-blown sands, commonly thought to be typical of deserts, make up only about 2% of North American deserts, 10% of the Sahara, and 30% of the Arabian desert.
(as used in expressions)
Kara Kum Desert
Great Indian Desert

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      any large, extremely dry area of land with sparse vegetation. It is one of the Earth's major types of ecosystems, supporting a community of distinctive plants and animals specially adapted to the harsh environment. For a list of selected deserts of the world, see below (desert).

      Desert environments are so dry that they support only extremely sparse vegetation; trees are usually absent and, under normal climatic conditions, shrubs or herbaceous plants provide only very incomplete ground cover. Extreme aridity renders some deserts virtually devoid of plants; however, this barrenness is believed to be due in part to the effects of human disturbance, such as heavy grazing of cattle, on an already stressed environment.

 According to some definitions, any environment that is almost completely free of plants is considered desert, including regions too cold to support vegetation—i.e., “frigid deserts.” Other definitions use the term to apply only to hot and temperate deserts, a restriction followed in this account. The distribution of hot and temperate deserts is shown in Figure 1—>.

      The desert environments of the present are, in geologic terms, relatively recent in origin. They represent the most extreme result of the progressive cooling and consequent aridification of global climates during the Cenozoic Era (66.4 million years ago to the present), which also led to the development of savannas and scrublands in the less arid regions near the tropical and temperate margins of the developing deserts. It has been suggested that many typical modern desert plant families, particularly those with an Asian centre of diversity such as the chenopod and tamarisk families, first appeared in the Miocene (23.7 to 5.3 million years ago), evolving in the salty, drying environment of the disappearing Tethys Sea along what is now the Mediterranean–Central Asian axis.

      Deserts also probably existed much earlier, during former periods of global arid climate in the lee of mountain ranges that sheltered them from rain or in the centre of extensive continental regions. However, this would have been primarily before the evolution of angiosperms (flowering plants, the group to which most present-day plants, including those of deserts, belong). Only a few primitive plants, which may have been part of the ancient desert vegetation, occur in present-day deserts. One example is the bizarre conifer relative Welwitschia in the Namib Desert of southwestern Africa. Welwitschia has only two leaves, which are leathery, straplike organs that emanate from the middle of a massive, mainly subterranean woody stem. These leaves grow perpetually from their bases and erode progressively at their ends. This desert also harbours several other plants and animals peculiarly adapted to the arid environment, suggesting that it might have a longer continuous history of arid conditions than most other deserts.

      Desert floras and faunas initially evolved from ancestors in moister habitats, an evolution that occurred independently on each continent. However, a significant degree of commonality exists among the plant families that dominate different desert vegetations. This is due in part to intrinsic physiologic characteristics in some widespread desert families that preadapt the plants to an arid environment; it also is a result of plant migration occurring through chance seed dispersal among desert regions.

      Such migration was particularly easy between northern and southern desert regions in Africa and in the Americas during intervals of drier climate that have occurred in the past two million years. This migration is reflected in close floristic similarities currently observed in these places. For example, the creosote bush (Larrea tridentata), although now widespread and common in North American hot deserts, was probably a natural immigrant from South America as recently as the end of the last Ice Age about 10,000 years ago.

      Migration between discrete desert regions also has been relatively easier for those plants adapted to survival in saline soils because such conditions occur not only in deserts but also in coastal (coast) habitats. Coasts can therefore provide migration corridors for salt-tolerant plants, and in some cases the drifting of buoyant seeds in ocean currents can provide a transport mechanism between coasts. For example, it is thought that the saltbush or chenopod family of plants reached Australia in this way, initially colonizing coastal habitats and later spreading into the inland deserts.

      Deserts are varied and variable environments, and it is impossible to arrive at a concise definition that satisfies every case . However, their most fundamental characteristic is a shortage of available moisture for plants, resulting from an imbalance between precipitation and evapotranspiration. This situation is exacerbated by considerable variability in the timing of rainfall, low atmospheric humidity, high daytime temperatures, and winds.

      Average annual precipitation ranges from almost zero in some South American coastal deserts and Libyan deserts to about 600 millimetres (24 inches) in deserts in Madagascar, although most recognized deserts have an annual rainfall below 400 millimetres. Some authorities consider 250 millimetres the upper limit for mean annual precipitation for true deserts, describing places with a mean annual rainfall of between 250 and 400 millimetres as semideserts. Regions this dry are barely arable and contribute to human food production only by providing grazing lands for livestock.

      The arid conditions of the major desert areas result from their position in subtropical regions to either side of the moist equatorial belt. The atmospheric circulation pattern known as the Hadley cell plays an important role in desert climate. In areas close to the Equator, where the amount of incoming solar energy per unit surface area is greatest, air near the ground is heated, then rises, expands, and cools. This process leads to the condensation of moisture and to precipitation. At high levels in the atmosphere, the risen air moves away from the equatorial region to descend eventually in the subtropics as it cools; it moves back toward the Equator at low altitudes, completing the Hadley cell circulation pattern. The air descending over the subtropics has already lost most of its moisture as rain formed during its previous ascent near the Equator. As it descends it becomes compressed and warmer, its relative humidity falling further. (For further discussion of relative humidity see biosphere: The organism and the environment: Environmental conditions: Humidity (biosphere).) Hot deserts occur in those regions to the north and south of the equatorial belt that lie beneath these descending, dry air masses. This pattern may be interrupted where local precipitation is increased, especially on the east sides of continents where winds blow onshore, carrying moisture picked up over the ocean. Conversely, deserts may be found elsewhere, as in the lee of mountain ranges, where air is forced to rise, cool, and lose moisture as rain falling on the windward slopes.

      Rainfall in deserts is usually meagre. In some cases several years may pass without rain; for example, at Cochones, Chile, no rain fell at all in 45 consecutive years between 1919 and 1964. Usually, however, rain falls in deserts for at least a few days each year—typically 15 to 20 days. When precipitation occurs, it may be very heavy for short periods. For instance, 14 millimetres fell at Mashʾabe Sade, Israel, in only seven minutes on Oct. 5, 1979, and in southwestern Madagascar the entire annual rainfall commonly occurs as heavy showers falling within a single month. Such rainfall usually occurs only over small areas and results from local convectional cells, with more widespread frontal rain being restricted to the southern and northern fringes of deserts. In some local desert showers, the rain falling from clouds evaporates before it reaches the ground. Regions near the equatorial margins of hot deserts receive most of their rain in summer—June to August in the Northern Hemisphere and December to February in the Southern Hemisphere—while those near the temperate margins receive most of their rainfall in winter. Rain is particularly erratic and equally unlikely to occur in all seasons in intermediate regions.

      In some deserts that are located near coasts, such as the Namib Desert of southwestern Africa and those of the west coasts of the Americas in California and Peru, fog is an important source of moisture that is otherwise scarce. Moisture droplets settle from the fog onto plants and then may drip onto the soil or be absorbed directly by plant shoots. dew also may be significant, although not in deserts in from the central parts of continents where atmospheric humidity is consistently very low.

      In most desert regions atmospheric humidity is usually too low to permit formation of fog or dew to any significant extent. Potential evaporation (vaporization) rates (the rate of evaporation that would occur if water were continually present) are correspondingly high, typically 2,500 to 3,500 millimetres per year, with as much as 4,262 millimetres potential evaporation per year having been recorded in Death Valley in California. Winds (wind) are not unusually strong or frequent in comparison with adjacent environments, but the general lack of vegetation in deserts exacerbates the effect of wind at ground level. Winds can induce the erosion of fine materials and the evaporation of moisture and thereby help determine which plants survive in the desert.

 Hot deserts, as their name indicates, experience very high temperatures (temperature) by day, especially in summer. Absolute maximum air temperatures in all hot deserts exceed 40° C (104° F), and the highest value recorded, in Libya, is 58° C (136.4° F). The temperature of the soil surface can rise even beyond that of the air, with values as high as 78° C (172° F) recorded in the Sahara. However, night temperatures can fall dramatically, because the same lack of cloud cover that admits high levels of incoming solar radiation during the day also allows rapid loss of energy through long-wave radiation to the sky at night. Absolute minimum temperatures, except in desert areas close to the sea, are generally below the freezing point. Typical mean annual temperatures are between 20° C (68° F) and 25° C (77° F).

      Temperate or cold deserts occur in temperate regions at higher latitudes—and therefore colder temperatures—than those at which hot deserts are found. These dry environments are caused by either remoteness from the coast, which results in low atmospheric humidity from a lack of onshore winds, or the presence of high mountains separating the desert from the coast. The largest area of temperate desert lies in Central Asia, with smaller areas in western North America, southeastern South America, and southern Australia. While they experience lower temperatures than the more typical hot deserts, temperate deserts are similar in aridity and consequent environmental features including landforms and soils.

      The peculiar climatic environment of deserts has favoured the development of certain characteristic landforms. Stony plains called regs or gibber plains are widespread, their surface covered by desert pavement consisting of coarse gravel and stones coated with a patina of dark “desert varnish” (a glossy dark surface cover consisting of oxides of iron). Rocky, boulder-strewn plateaus cut by dry, usually steep-sided valleys called wadis (arroyo) are also found in deserts in many parts of the world. The local topographic and microclimatic variations produced by this rugged surface, and the opportunities for runoff—and in a few places surface accumulation—of rainwater, are important in providing localized habitats for plants and animals. Large areas of loose, mobile sand provide the harshest and poorest of the major desert habitat types.

      Desert soils (soil) are mainly immature, weakly developed in terms of their soil profiles, and mostly alkaline. Sands, sandy or gravelly loams, shallow stony soils, and alluvium (material deposited by rivers and streams) and scree-derived deposits (rocky material at the base of cliffs) predominate. Although almost always dry, these soils may support well-developed microbial communities, particularly in association with roots. Domestic animals, however, can have a deleterious impact by trampling and compacting the soil; this activity can reduce the infiltration of water and damage vegetation, leading to erosion and redistribution of soil materials.


      In most cases floristic links among desert regions are indicated by the presence of related species; it is unusual for identical species to be found in more than one region, except where they have been introduced by humans. (One notable exception is the prickly saltwort [Salsola kali], which occurs in deserts in Central Asia, North Africa, California, and Australia, as well as in many saline coastal areas.) Floristic similarities among desert regions are particularly obvious where no wide barriers of ocean or humid vegetation exist to restrict plant migration. Floristic links can be observed across the great expanse of desert from the Sahara to Central Asia, despite climatic contrasts between the hot environments in areas in and around North Africa and the much colder, though still dry, regions to the northeast. Floristic links are also pronounced from north to south in Africa and the Americas. As expected, the more isolated Australian desert flora has fewer similarities to the floras of other regions.

      The daisy family (Asteraceae) is the most diverse plant family in deserts overall; it is especially numerous in Australia, southern Africa, the Middle East, and North America. However, except for the widespread Artemisia (wormwood) and Senecio, which are ubiquitous, different genera in this family are found in different desert regions. Although grasses predominate in the deserts of Iran, the Sahara, and the Thar Desert of India, members of the daisy family are almost as diverse here also. Another family well represented in deserts and other vegetation types is the bean family.

      More locally significant plant families in deserts include the ice plant and lily families in Africa; the cabbage family from the Sahara to Iran; the carnation family in the Middle East; and the myrtle, protea, and casuarina families in Australia. All families also occur in other vegetation types in those same regions and represent elements of regionally prominent groups that have adapted to arid environments.

      Members of some other plant families are common in desert vegetation but are not prominent components of other vegetation types. The best example is the chenopod or saltbush family, which is varied and diverse in arid and semiarid regions of Australia, North America, and from the Sahara to Iran, India, and Central Asia but scarce in other ecosystems. The cactus family is very prominent in deserts in the Americas but absent elsewhere. Another example is the smaller and generally less well-known family Frankeniaceae, which is typical of salty habitats and reaches its greatest diversity in deserts from North Africa to Central Asia and in western South America.

      Trees (tree) and large shrubs (shrub) are found in desert environments, although they are not often prominent, at least in the driest deserts and in many regions in which they have been virtually eliminated through human action. These desert species commonly belong to the bean family (such genera as acacia and Cassia in most regions), with conifers being more locally distributed (such as Pinus (pine) in North America, Callitris in Australia, and Cupressus (cypress) in North Africa and the Middle East). Tamarisks (tamarisk) (Tamarix) are particularly important on sandy soils in Central Asia and also occur abundantly as introduced plants in parts of the North American and Australian deserts.

      Smaller shrubs include artemisia and Ephedra in Central Asia and North America, Atriplex in both these regions and also Australia, and Larrea in North and South America. Artemisia includes many species in deserts in the Northern Hemisphere, especially in temperate deserts where they dominate the vegetation across very large areas; this genus has not spread to any of the southern deserts.

      Perennial grasses (grass) occur in most deserts. In the Northern Hemisphere, species of Aristida and Panicum are present in most hot deserts, and Stipa is found in temperate deserts. In Australia, spinifex grasses (Plectrachne and Triodia) are widespread.

 A few large, common, conspicuous plants provide deserts with much of their regional character. In North America, the Sonoran Desert of northwestern Mexico and the adjacent areas of California and Arizona are dotted with large cacti, especially the tall saguaro (Cereus giganteus; see video of Sonoran Desert plant life), while to the north in the cooler Mojave Desert the characteristic Joshua tree (Yucca brevifolia) is found. The creosote bush (Larrea tridentata) is common in both areas. The spiny, hummock-forming spinifex grasses typify Australian deserts, while fleshy, cactuslike species of Euphorbia (spurge) are conspicuous in deserts located in parts of southern and eastern Africa.

 A vegetation profile of deserts is shown in Figure 2—>.

      The larger animals of deserts are more regionally distinct than are the plants. Australia—geographically the most isolated continent—is most distinctive. The Australian desert fauna is marked by a very high diversity of reptiles (reptile), in comparison with other regions, and fewer mammals, a situation shared in some degree with the South American deserts. Many Australian mammals that are not rodents—the most diverse group of mammals in other deserts—are marsupials (marsupial). Marsupials include a wide range of kangaroos, wallabies and their relatives, bandicoots, and the burrowing marsupial mole. Many smaller Australian desert mammals have recently become rare or extinct. A common animal in many Australian desert areas today is the European rabbit, which was introduced by humans. Various native species of rabbit and hare are typical occupants of most other desert regions. Camels (camel) have been introduced and are also well established in Australian deserts; this region is now the only place where camels occur in a totally undomesticated state.

      In the hot deserts of the Old World, most large, herbivorous mammals (mammal) at the present time, including camels, donkeys, goats, sheep, and horses, are domesticated. Wild species such as gazelles, ibexes, and oryxes are generally rare. Smaller burrowing rodents are more common and varied, as are reptiles. Large carnivores include foxes, hyenas, and several cat species, such as leopards and lynx, although the largest species, the lion, has become extinct there.

      Many desert birds (bird) are nomadic, a habit that enables these creatures to relocate to areas in which rain has fallen recently and which provide a temporary abundance of food. Seed-eating finches (finch) and pigeons are among the typical birds of many desert regions; Australia is again the exception in having few finches but many desert parrots instead—for example, the budgerigar (Melopsittacus undulatus). Carnivorous birds can depend on their prey for water, but seedeaters need to drink and sometimes fly considerable distances to locate surface water.

Population and community development and structure
 Desert plants (plant) and animals have many peculiar adaptations that enable them to survive long periods of moisture shortage and to take maximal advantage of short, infrequent wet periods(see video of survival strategies) .

      Perennial plants commonly survive dry times by becoming physiologically inactive. In some cases they remain alive but are desiccated until water becomes available, at which time they rapidly absorb moisture through aboveground parts, swelling and resuming physiological activity. Some plants can absorb dew, which for many is the main water source. Mosses and lichens adopt this strategy, as do some flowering plants, which are sometimes called resurrection plants (rose of Jericho).

      Other desert plants survive dry periods through underground organs such as bulbs, tubers, or rhizomes. These structures are inactive, requiring and using little water until triggered to grow by rain soaking into the soil. They then grow rapidly, using food reserves stored within, flowering and setting seed before soil moisture becomes substantially depleted once more.

      Certain plants, including large woody plants and some herbaceous perennials, can remain physiologically active to some extent through dry periods. Plants employ several strategies to carry this off: water storage organs, such as the succulent stems of cacti, euphorbias, and ice plants, hold water until it is needed; very deep root systems reach soil moisture at depth; and certain features, such as leaves of reduced size or hairy or reflective leaves, reduce water loss.

      Another typical feature of desert floras is their large proportion of ephemeral plants, which survive dry periods as resistant, dormant seeds. After a rain, the seeds germinate at once and the plants grow quickly, flower early, and complete their reproduction within a few weeks before the soil dries out again. It is primarily plants with this response that cause the deserts to bloom after infrequent storms.

      Desert animals show many comparable adaptations to infrequent moisture availability in deserts, resulting in little activity during the usually dry times and intense activity in the brief, infrequent wet periods. During dry conditions many desert animals remain underground in holes or burrows in which the air is relatively cool and humid; more than half of desert animals are subterranean in their habits. Some, such as snails, may remain dormant for long periods, while others, such as burrowing mammals, emerge to feed only at night when conditions are cool and much less dehydrating. Reproduction may cease altogether in years of extreme drought, as it does in some lizards.

      It is now clear that in several regions desert environments are expanding—a process called desertification. This process may be defined as land degradation in arid, semiarid, or dry, subhumid areas that results from various factors including climatic variation and human activities. In areas where the vegetation is already under stress from natural or anthropogenic factors, periods of drier than average weather may cause degradation of the vegetation. If the pressures are maintained, soil loss and irreversible change in the ecosystem may ensue, so that areas formerly under savanna or scrubland vegetation are reduced to desert.

      There is some evidence that removal of vegetation can also affect climate, causing it to become drier. Bare ground reflects more incoming solar energy and does not heat up as much as ground containing vegetation. Thus, the air that is near the ground does not warm up as much and its vertical movement is reduced, as is atmospheric cooling necessary for condensation and ultimately precipitation to occur.

      The main regions currently at risk of desertification are the Sahel region lying to the south of the Sahara, parts of eastern, southern, and northwestern Africa, and large areas of Australia, south-central Asia, and central North America. The arid regions with the longest history of agriculture—from North Africa to China—have generally less well-vegetated deserts. Plant-based desert classification systems from these regions contrast with those from places without such a long history of human usage, such as Australia and the Americas, probably because degradation of the vegetation has been occurring in the Old World regions for a much longer time. Systems incorporating desert vegetation types in Australia and the Americas recognize and include vegetation types with a prominent woody plant (shrub) component and tend to exclude some less arid but heavily altered vegetation types. The present extent of deserts in the Old World is thought to be significantly greater than it would be had human impact not occurred. Support for this view is found in various places, such as the several-thousand-year-old rock art from the central Sahara that illustrates cattle and wildlife in regions now unable to support these creatures.

Biological productivity
      In the highly stressful desert environment, productivity is generally very low; however, it is also highly variable from time to time and from place to place. (For a full discussion of productivity, see biosphere: The organism and the environment: Resources of the biosphere (biosphere).)

      Temporal variations are caused by the occasional input of moisture; this allows the vegetation to grow for only a short period before arid conditions resume. Spatial variations are due in part to the structural patchiness of the vegetation itself, as surface soil beneath shrubs (shrub) is several times more fertile than it is between shrubs. Shrub roots contribute to this process by retrieving nutrients from the deep soil and depositing them in litter on the soil surface beneath the shrub canopy. Windblown litter that accumulates around shrubs and the microbial flora found in soil shaded by the shrub canopy also create patchy, fertile areas. Because human disturbance of desert vegetation commonly involves the partial or total removal of the shrub cover, the impact of human disturbance on these ecosystems is significant.

Jeremy M.B. Smith

Selected world deserts
       Deserts of the world Deserts of the worldA list of selected world deserts is provided in the table.

Additional Reading
Tropical deserts are described and put into their vegetational context in an old but still informative book by Heinrich Walter, Ecology of Tropical and Subtropical Vegetation (1971; originally published in German, 2nd ed., 1964). Deserts are more explicitly and broadly described and explored in Michael Evenari, Imanuel Noy-Meir, and David W. Goodall (eds.), Hot Deserts and Arid Shrublands, 2 vol. (1985–86).Jeremy M.B. Smith

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Universalium. 2010.

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