Biogeography: Difference between revisions

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(New page: '''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.<ref>Martiny JBH et ...)
 
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== History ==
== History ==
The 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 [[Edward Osborne Wilson|E.O. Wilson]] in [[1967]] (which expanded their [[1963]] paper on the same topic) the field of biogeography was seen as a primarily historical one, and as such the field was seen as a purely descriptive one.   
The 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 [[Edward Osborne Wilson|E.O. Wilson]] in [[1967]] (which expanded their [[1963]] paper on the same topic) the field of biogeography was seen as a primarily historical one, and as such the field was seen as purely descriptive.   


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 fragmentation|habitat fragments]] spurred the development of the fields of [[conservation biology]] and [[landscape ecology]] (at least among British and American academics; landscape ecology has a distinct genesis among European academics).   
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 fragmentation|habitat fragments]] later spurred the development of the fields of [[conservation biology]] and [[landscape ecology]], at least among British and American academics. Landscape ecology has a distinct genesis among European academics.   


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 [[endemic (ecology)|island endemic]]s.  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]].
Classic biogeography expanded with the development of [[molecular systematics]], creating a new discipline known as [[phylogeography]].  This development allowed scientists to more empirically test theories about the origin and dispersal of populations, such as [[endemic (ecology)|island endemic]]s.  For example, while classic biogeographers speculated 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]].


'''Paleobiogeography''' goes one step further to include [[paleogeography|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 [[Gondwana]]n 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 [[suboscine]]s.
'''Paleobiogeography''' goes a step further to include [[paleogeography|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 [[Gondwana]]n 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 [[suboscine]]s.
 
National Biogeography Awareness Week, which started in 1982, is October 14th - 21st.


== Classification ==
== Classification ==

Revision as of 21:58, 27 October 2007

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.[1]

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 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 (which expanded their 1963 paper on the same topic) the field of biogeography was seen as a primarily historical one, and as such the field was seen as purely descriptive.

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 later spurred the development of the fields of conservation biology and landscape ecology, at least among British and American academics. Landscape ecology has a distinct genesis among European academics.

Classic biogeography expanded with the development of molecular systematics, creating a new discipline known as phylogeography. This development allowed scientists to more empirically test theories about the origin and dispersal of populations, such as island endemics. For example, while classic biogeographers speculated 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.

Paleobiogeography goes a 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 migrationTemplate:Dn)
  • range and distribution
  • endemic areas
  • vicariance

See also

References

  1. ↑ Martiny JBH et al Microbial biogeography: putting microorganisms on the map Nature: FEBRUARY 2006 | VOLUME 4
  • Jønsson, Knud A. & Fjeldså, Jon (2006): Determining biogeographical patterns of dispersal and diversification in oscine passerine birds in Australia, Southeast Asia and Africa. J. Biogeogr. 33(7): 1155–1165. Template:DOI (HTML abstract)
  • Dansereau, Pierre (1957): Biogeography: An Ecological Perspective. Ronald Press Company, New York City, ISBN 0826023304.

External links

Major journals

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