AskDefine | Define biogeography

Dictionary Definition

biogeography n : dealing with the geographical distribution of animals and plants

User Contributed Dictionary

English

Etymology

bio- + geography

Noun

  1. the study of the geographical distribution of plants and animals

Extensive Definition

Biogeography is the study of the distribution of biodiversity over space and time. It aims to reveal where organisms live, at what abundance, and why.
The patterns of species distribution at this level can usually be explained through a combination of historical factors such as speciation, extinction, continental drift, glaciation (and associated variations in sea level, river routes, and so on), and river capture, in combination with the area and isolation of landmasses (geographic constraints) and available energy supplies.

History

The scientific theory of biogeography grows out of the work of Alfred Russel Wallace and other early evolutionary scientists. Wallace studied the distribution of flora and fauna in the Malay Archipelago in the 19th century. With the exception of Wallace and a few others, prior to the publication of The Theory of Island Biogeography by Robert MacArthur and E.O. Wilson in 1967 the field of biogeography was seen as a primarily historical one and as such the field was seen as a purely descriptive one.
MacArthur and Wilson changed this perception, and showed that the species richness of an area could be predicted in terms of such factors as habitat area, immigration rate and extinction rate. This gave rise to an interest in island biogeography. The application of island biogeography theory to habitat fragments spurred the development of the fields of conservation biology and landscape ecology.
Classic biogeography has been expanded by the development of molecular systematics, creating a new discipline known as phylogeography. This development allowed scientists to test theories about the origin and dispersal of populations, such as island endemics. For example, while classic biogeographers were able to speculate about the origins of species in the Hawaiian Islands, phylogeography allows them to test theories of relatedness between these populations and putative source populations in Asia and North America.

Palaeobiogeography

Paleobiogeography goes one step further to include paleogeographic data and considerations of plate tectonics. Using molecular analyses and corroborated by fossils, it has been possible to demonstrate that perching birds evolved first in the region of Australia or the adjacent Antarctic (which at that time lay somewhat further north and had a temperate climate). From there, they spread to the other Gondwanan continents and Southeast Asia - the part of Laurasia then closest to their origin of dispersal - in the late Paleogene, before achieving a global distribution in the early Neogene (Jønsson & Fjeldså 2006). Not knowing the fact that at the time of dispersal, the Indian Ocean was much narrower than it is today, and that South America was closer to the Antarctic, one would be hard pressed to explain the presence of many "ancient" lineages of perching birds in Africa, as well as the mainly South American distribution of the suboscines.

Classification

Biogeography is a synthetic science, related to geography, biology, soil science, geology, climatology, ecology and evolution.
Some fundamentals in biogeography are
  • evolution (change in genetic composition of a population)
  • extinction (disappearance of a species)
  • dispersal (movement of populations away from their point of origin, related to migration)
  • range and distribution
  • endemic areas
  • vicariance

See also

Notes and References

Further reading

  • Jønsson, Knud A. & Fjeldså, Jon (2006). Determining biogeographical patterns of dispersal and diversification in oscine passerine birds in Australia, Southeast Asia and Africa. Journal of Biogeography 33(7): 1155–1165. (HTML abstract)
  • Biogeography: An Ecological Perspective
  • Geographic Ecology

External links

Major journals

biogeography in Arabic: جغرافيا حيوية
biogeography in Bulgarian: Биогеография
biogeography in Catalan: Biogeografia
biogeography in Chuvash: Биогеографи
biogeography in German: Biogeographie
biogeography in Estonian: Biogeograafia
biogeography in Modern Greek (1453-): Βιογεωγραφία
biogeography in Spanish: Biogeografía
biogeography in Esperanto: Biogeografio
biogeography in French: Biogéographie
biogeography in Croatian: Biogeografija
biogeography in Italian: Biogeografia
biogeography in Georgian: ბიოგეოგრაფია
biogeography in Lithuanian: Biogeografija
biogeography in Hungarian: Biogeográfia
biogeography in Dutch: Biogeografie
biogeography in Japanese: 生物地理学
biogeography in Norwegian: Biogeografi
biogeography in Norwegian Nynorsk: Biogeografi
biogeography in Polish: Biogeografia
biogeography in Portuguese: Biogeografia
biogeography in Romanian: Biogeografie
biogeography in Quechua: Kawsay allpa saywachi
biogeography in Russian: Биогеография
biogeography in Simple English: Biogeography
biogeography in Slovak: Biogeografia
biogeography in Slovenian: Biogeografija
biogeography in Serbian: Биогеографија
biogeography in Finnish: Eliömaantiede
biogeography in Swedish: Biogeografi
biogeography in Tamil: உயிர்ப்புவியியல்
biogeography in Turkish: Biyocoğrafya
biogeography in Ukrainian: Біогеографія
biogeography in Chinese: 生物地理学
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