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 term than habitat and can comprise a variety of habitats.
While a biome can cover large areas, a microbiome is a mix of organisms that coexist in a defined space on a much smaller scale. For example, the human microbiome is the collection of bacteria, viruses, and other microorganisms that are present on or in a human body.
A 'biota' is the total collection of organisms of a geographic region or a time period. From local geographic scales and instantaneous temporal scales all the way up to whole-planet and whole-timescale spatiotemporal scales. The biotas of the Earth make up the biosphere.
The term was suggested in 1916 by Clements, originally as a synonym for biotic community of Möbius (1877). Later, it gained its current definition, based on earlier concepts of phytophysiognomy, formation and vegetation (used in opposition to flora), with the inclusion of the animal element and the exclusion of the taxonomic element of species composition. In 1935, Tansley added the climatic and soil aspects to the idea, calling it ecosystem. The International Biological Program (1964–74) projects popularized the concept of biome.
However, in some contexts, the term biome is used in a different manner. In German literature, particularly in the Walter terminology, the term is used similarly as biotope (a concrete geographical unit), while the biome definition used in this article is used as an international, non-regional, terminology—irrespectively of the continent in which an area is present, it takes the same biome name—and corresponds to his "zonobiome", "orobiome" and "pedobiome" (biomes determined by climate zone, altitude or soil).
In Brazilian literature, the term "biome" is sometimes used as synonym of biogeographic province, an area based on species composition (the term floristic province being used when plant species are considered), or also as synonym of the "morphoclimatic and phytogeographical domain" of Ab'Sáber, a geographic space with subcontinental dimensions, with the predominance of similar geomorphologic and climatic characteristics, and of a certain vegetation form. Both include many biomes in fact.
To divide the world into a few ecological zones is difficult, notably because of the small-scale variations that exist everywhere on earth and because of the gradual changeover from one biome to the other. Their boundaries must therefore be drawn arbitrarily and their characterization made according to the average conditions that predominate in them.
A 1978 study on North American grasslands found a positive logistic correlation between evapotranspiration in mm/yr and above-ground net primary production in g/m2/yr. The general results from the study were that precipitation and water use led to above-ground primary production, while solar irradiation and temperature lead to below-ground primary production (roots), and temperature and water lead to cool and warm season growth habit. These findings help explain the categories used in Holdridge's bioclassification scheme (see below), which were then later simplified by Whittaker. The number of classification schemes and the variety of determinants used in those schemes, however, should be taken as strong indicators that biomes do not fit perfectly into the classification schemes created.
Holdridge (1947, 1964) life zonesEdit
In 1947, the American botanist and climatologist Leslie Holdridge classified climates based on the biological effects of temperature and rainfall on vegetation under the assumption that these two abiotic factors are the largest determinants of the types of vegetation found in a habitat. Holdridge uses the four axes to define 30 so-called "humidity provinces", which are clearly visible in his diagram. While this scheme largely ignores soil and sun exposure, Holdridge acknowledged that these were important.
Allee (1949) biome-typesEdit
The principal biome-types by Allee (1949):
- Deciduous forest
- High plateaus
- Tropical forest
- Minor terrestrial biomes
Kendeigh (1961) biomesEdit
The principal biomes of the world by Kendeigh (1961):
Whittaker (1962, 1970, 1975) biome-typesEdit
Whittaker classified biomes using two abiotic factors: precipitation and temperature. His scheme can be seen as a simplification of Holdridge's; more readily accessible, but missing Holdridge's greater specificity.
Whittaker based his approach on theoretical assertions and empirical sampling. He had previously compiled a review of biome classifications.
Key definitions for understanding Whittaker's schemeEdit
- Physiognomy: sometimes referring to the plants' appearance; or the biome's apparent characteristics, outward features, or appearance of ecological communities or species - including plants.
- Biome: a grouping of terrestrial ecosystems on a given continent that is similar in vegetation structure, physiognomy, features of the environment and characteristics of their animal communities.
- Formation: a major kind of community of plants on a given continent.
- Biome-type: grouping of convergent biomes or formations of different continents, defined by physiognomy.
- Formation-type: a grouping of convergent formations.
Whittaker's distinction between biome and formation can be simplified: formation is used when applied to plant communities only, while biome is used when concerned with both plants and animals. Whittaker's convention of biome-type or formation-type is a broader method to categorize similar communities.
Whittaker's parameters for classifying biome-typesEdit
- Intertidal levels: The wetness gradient of areas that are exposed to alternating water and dryness with intensities that vary by location from high to low tide
- Climatic moisture gradient
- Temperature gradient by altitude
- Temperature gradient by latitude
Along these gradients, Whittaker noted several trends that allowed him to qualitatively establish biome-types:
- The gradient runs from favorable to the extreme, with corresponding changes in productivity.
- Changes in physiognomic complexity vary with how favorable of an environment exists (decreasing community structure and reduction of stratal differentiation as the environment becomes less favorable).
- Trends in the diversity of structure follow trends in species diversity; alpha and beta species diversities decrease from favorable to extreme environments.
- Each growth-form (i.e. grasses, shrubs, etc.) has its characteristic place of maximum importance along the ecoclines.
- The same growth forms may be dominant in similar environments in widely different parts of the world.
Whittaker summed the effects of gradients (3) and (4) to get an overall temperature gradient and combined this with a gradient (2), the moisture gradient, to express the above conclusions in what is known as the Whittaker classification scheme. The scheme graphs average annual precipitation (x-axis) versus average annual temperature (y-axis) to classify biome-types.
- Tropical rainforest
- Tropical seasonal rainforest
- Temperate giant rainforest
- Montane rainforest
- Temperate deciduous forest
- Temperate evergreen forest
- Subarctic-subalpine needle-leaved forests (taiga)
- Elfin woodland
- Thorn forests and woodlands
- Thorn scrub
- Temperate woodland
- Temperate shrublands
- Temperate grassland
- Alpine grasslands
- Tropical desert
- Warm-temperate desert
- Cool temperate desert scrub
- Arctic-alpine desert
- Tropical fresh-water swamp forest
- Temperate fresh-water swamp forest
- Mangrove swamp
- Salt marsh
Goodall (1974–) ecosystem typesEdit
- Terrestrial Ecosystems
- Natural Terrestrial Ecosystems
- Wet Coastal Ecosystems
- Dry Coastal Ecosystems
- Polar and Alpine Tundra
- Mires: Swamp, Bog, Fen, and Moor
- Temperate Deserts and Semi-Deserts
- Coniferous Forests
- Temperate Deciduous Forests
- Natural Grasslands
- Heathlands and Related Shrublands
- Temperate Broad-Leaved Evergreen Forests
- Mediterranean-Type Shrublands
- Hot Deserts and Arid Shrublands
- Tropical Savannas
- Tropical Rain Forest Ecosystems
- Wetland Forests
- Ecosystems of Disturbed Ground
- Managed Terrestrial Ecosystems
- Managed Grasslands
- Field Crop Ecosystems
- Tree Crop Ecosystems
- Greenhouse Ecosystems
- Bioindustrial Ecosystems
- Natural Terrestrial Ecosystems
- Aquatic Ecosystems
- Inland Aquatic Ecosystems
- River and Stream Ecosystems
- Lakes and Reservoirs
- Marine Ecosystems
- Intertidal and Littoral Ecosystems
- Coral Reefs
- Estuaries and Enclosed Seas
- Ecosystems of the Continental Shelves
- Ecosystems of the Deep Ocean
- Managed Aquatic Ecosystems
- Managed Aquatic Ecosystems
- Inland Aquatic Ecosystems
- Underground Ecosystems
- Cave Ecosystems
Walter (1976, 2002) zonobiomesEdit
The eponymously-named Heinrich Walter classification scheme considers the seasonality of temperature and precipitation. The system, also assessing precipitation and temperature, finds nine major biome types, with the important climate traits and vegetation types. The boundaries of each biome correlate to the conditions of moisture and cold stress that are strong determinants of plant form, and therefore the vegetation that defines the region. Extreme conditions, such as flooding in a swamp, can create different kinds of communities within the same biome.
|Zonobiome||Zonal soil type||Zonal vegetation type|
|ZB I. Equatorial, always moist, little temperature seasonality||Equatorial brown clays||Evergreen tropical rainforest|
|ZB II. Tropical, summer rainy season and cooler “winter” dry season||Red clays or red earths||Tropical seasonal forest, seasonal dry forest, scrub, or savanna|
|ZB III. Subtropical, highly seasonal, arid climate||Serosemes, sierozemes||Desert vegetation with considerable exposed surface|
|ZB IV. Mediterranean, winter rainy season and summer drought||Mediterranean brown earths||Sclerophyllous (drought-adapted), frost-sensitive shrublands and woodlands|
|ZB V. Warm temperate, occasional frost, often with summer rainfall maximum||Yellow or red forest soils, slightly podsolic soils||Temperate evergreen forest, somewhat frost-sensitive|
|ZB VI. Nemoral, moderate climate with winter freezing||Forest brown earths and grey forest soils||Frost-resistant, deciduous, temperate forest|
|ZB VII. Continental, arid, with warm or hot summers and cold winters||Chernozems to serozems||Grasslands and temperate deserts|
|ZB VIII. Boreal, cold temperate with cool summers and long winters||Podsols||Evergreen, frost-hardy, needle-leaved forest (taiga)|
|ZB IX. Polar, short, cool summers and long, cold winters||Tundra humus soils with solifluction (permafrost soils)||Low, evergreen vegetation, without trees, growing over permanently frozen soils|
Schultz (1988) eco-zonesEdit
- polar/subpolar zone
- boreal zone
- humid mid-latitudes
- dry mid-latitudes
- subtropics with winter rain
- subtropics with year-round rain
- dry tropics and subtropics
- tropics with summer rain
- tropics with year-round rain
Bailey (1989) ecoregionsEdit
Robert G. Bailey nearly developed a biogeographical classification system of ecoregions for the United States in a map published in 1976. He subsequently expanded the system to include the rest of North America in 1981, and the world in 1989. The Bailey system, based on climate, is divided into four domains (polar, humid temperate, dry, and humid tropical), with further divisions based on other climate characteristics (subarctic, warm temperate, hot temperate, and subtropical; marine and continental; lowland and mountain).
- 100 Polar Domain
- 200 Humid Temperate Domain
- 210 Warm Continental Division (Köppen: portion of Dcb)
- M210 Warm Continental Division – Mountain Provinces
- 220 Hot Continental Division (Köppen: portion of Dca)
- M220 Hot Continental Division – Mountain Provinces
- 230 Subtropical Division (Köppen: portion of Cf)
- M230 Subtropical Division – Mountain Provinces
- 240 Marine Division (Köppen: Do)
- M240 Marine Division – Mountain Provinces
- 250 Prairie Division (Köppen: arid portions of Cf, Dca, Dcb)
- 260 Mediterranean Division (Köppen: Cs)
- M260 Mediterranean Division – Mountain Provinces
- 300 Dry Domain
- 310 Tropical/Subtropical Steppe Division
- M310 Tropical/Subtropical Steppe Division – Mountain Provinces
- 320 Tropical/Subtropical Desert Division
- 330 Temperate Steppe Division
- 340 Temperate Desert Division
- 400 Humid Tropical Domain
- 410 Savanna Division
- 420 Rainforest Division
Olson & Dinerstein (1998) biomes for WWF / Global 200Edit
A team of biologists convened by the World Wildlife Fund (WWF) developed a scheme that divided the world's land area into biogeographic realms (called "ecozones" in a BBC scheme), and these into ecoregions (Olson & Dinerstein, 1998, etc.). Each ecoregion is characterized by a main biome (also called major habitat type).
Biogeographic realms (terrestrial and freshwater)Edit
The applicability of the realms scheme above - based on Udvardy (1975)—to most freshwater taxa is unresolved.
- Tropical and subtropical moist broadleaf forests (tropical and subtropical, humid)
- Tropical and subtropical dry broadleaf forests (tropical and subtropical, semihumid)
- Tropical and subtropical coniferous forests (tropical and subtropical, semihumid)
- Temperate broadleaf and mixed forests (temperate, humid)
- Temperate coniferous forests (temperate, humid to semihumid)
- Boreal forests/taiga (subarctic, humid)
- Tropical and subtropical grasslands, savannas, and shrublands (tropical and subtropical, semiarid)
- Temperate grasslands, savannas, and shrublands (temperate, semiarid)
- Flooded grasslands and savannas (temperate to tropical, fresh or brackish water inundated)
- Montane grasslands and shrublands (alpine or montane climate)
- Tundra (Arctic)
- Mediterranean forests, woodlands, and scrub or sclerophyll forests (temperate warm, semihumid to semiarid with winter rainfall)
- Deserts and xeric shrublands (temperate to tropical, arid)
- Mangrove (subtropical and tropical, salt water inundated)
- Large lakes
- Large river deltas
- Polar freshwaters
- Montane freshwaters
- Temperate coastal rivers
- Temperate floodplain rivers and wetlands
- Temperate upland rivers
- Tropical and subtropical coastal rivers
- Tropical and subtropical floodplain rivers and wetlands
- Tropical and subtropical upland rivers
- Xeric freshwaters and endorheic basins
- Oceanic islands
Summary of the schemeEdit
- Biogeographic realm: Palearctic
- Ecoregion: Dinaric Mountains mixed forests (PA0418); biome type: temperate broadleaf and mixed forests
- Biogeographic realm: Palearctic
Pruvot (1896) zones or "systems":
- Trade wind
Humans have altered global patterns of biodiversity and ecosystem processes. As a result, vegetation forms predicted by conventional biome systems can no longer be observed across much of Earth's land surface as they have been replaced by crop and rangelands or cities. Anthropogenic biomes provide an alternative view of the terrestrial biosphere based on global patterns of sustained direct human interaction with ecosystems, including agriculture, human settlements, urbanization, forestry and other uses of land. Anthropogenic biomes offer a way to recognize the irreversible coupling of human and ecological systems at global scales and manage Earth's biosphere and anthropogenic biomes.
Major anthropogenic biomes:
The endolithic biome, consisting entirely of microscopic life in rock pores and cracks, kilometers beneath the surface, has only recently been discovered, and does not fit well into most classification schemes.
Effects of Climate ChangeEdit
Climate change has the potential to greatly alter the distribution of Earth's biomes. Meaning, biomes around the world could change so much that they would be at risk of becoming new biomes entirely. General frequency models have been a staple in finding out the impact climate change could have on biomes. More specifically, 54% and 22% of global land area will experience climates that correspond to other biomes. 3.6% of land area will experience climates that are completely new or unusual. Average temperatures have risen more than twice the usual amount in both arctic and mountainous biomes. Which leads to the conclusion that artic and mountainous biomes are currently the most vulnerable to climate change. The current reasoning surrounding as to why this is the case are based around the fact that colder environments tend to reflect more sunlight, as a result of the snow and ice covering the ground. Since the annual average temperatures are rising, ice and snow is melting. As a result, albedo is lowered. Keeping a keen eye on terrestrial biomes is important, as they play a crucial role in climate regulation. South American terrestrial biomes have been predicted to go through the same temperature trends as arctic and mountainous biomes. With its annual average temperature continuing to increase, the moisture currently located in forest biomes will dry up.
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