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Biogeography is the study of the distribution of communities often vary in a regular fashion along geographic gradients of latitude, elevation, isolation and habitat area. Phytogeography is the branch of biogeography that studies the distribution of plants. Zoogeography is the branch that studies distribution of animals.
Knowledge of spatial variation in the numbers and types of organisms is as vital to us today as it was to our early human ancestors, as we adapt to heterogeneous but geographically predictable environments. Biogeography is an integrative field of inquiry that unites concepts and information from ecology, evolutionary biology, geology, and physical geography.
Modern biogeographic research combines information and ideas from many fields, from the physiological and ecological constraints on organismal dispersal to geological and climatological phenomena operating at global spatial scales and evolutionary time frames.
The short-term interactions within a habitat and species of organisms describe the ecological application of biogeography. Historical biogeography describes the long-term, evolutionary periods of time for broader classifications of organisms. Early scientists, beginning with Carl Linnaeus, contributed theories to the contributions of the development of biogeography as a science. Beginning in the mid-18th century, Europeans explored the world and discovered the biodiversity of life. Linnaeus initiated the ways to classify organisms through his exploration of undiscovered territories.
The scientific theory of biogeography grows out of the work of Alexander von Humboldt (1769–1859), Hewett Cottrell Watson (1804–1881), Alphonse de Candolle (1806–1893), Alfred Russel Wallace (1823–1913), Philip Lutley Sclater (1829–1913) and other biologists and explorers.
- Introduction 1
- 18th Century 2.1
- 19th Century 2.2
- 20th and 21st Century 2.3
- Modern Applications of Biogeography 3
- Paleobiogeography 4
- Comparative biogeography 5.1
- See also 6
- Notes and references 7
- Further reading 8
External links 9
- Major journals 9.1
The patterns of species distribution across geographical areas can usually be explained through a combination of historical factors such as: speciation, extinction, continental drift, and glaciation. Through observing the geographic distribution of species, we can see associated variations in sea level, river routes, habitat, and river capture. Additionally, this science considers the geographic constraints of landmass areas and isolation, as well as the available ecosystem energy supplies.
Over periods of ecological changes, biogeography includes the study of plant and animal species in: their past and/or present living refugium habitat; their interim living sites; and/or their survival locales. As writer David Quammen put it, "...biogeography does more than ask Which species? and Where. It also asks Why? and, what is sometimes more crucial, Why not?."
Modern biogeography often employs the use of
- homepageJournal of Biogeography.
- homepageGlobal Ecology and Biogeography.
- International Biogeography Society
- Systematic & Evolutionary Biogeographical Society
- Early Classics in Biogeography, Distribution, and Diversity Studies: To 1950
- Early Classics in Biogeography, Distribution, and Diversity Studies: 1951-1975
- Some Biogeographers, Evolutionists and Ecologists: Chrono-Biographical Sketches
- Albert, J. S., & R. E. Reis (2011). Historical Biogeography of Neotropical Freshwater Fishes. University of California Press, Berkeley. 424 pp.
- Brown University, "Biogeography." Accessed February 24, 2014. http://biomed.brown.edu/Courses/BIO48/29.Biogeography.HTML.
- Dansereau, Pierre. 1957. Biogeography; an ecological perspective. New York: Ronald Press Co.
- Cox, C Barry, and Peter Moore. Biogeography : an ecological and evolutionary approach. Malden, MA: Blackwell Publications, 2005.
- von Humboldt 1805. Essai sur la geographie des plantes; accompagne d'un tableau physique des régions equinoxiales. Levrault, Paris.
- Watson H.C. 1847–1859. Cybele Britannica: or British plants and their geographical relations. Longman, London.
- de Candolle, Alphonse 1855. Géographie botanique raisonnée &c. Masson, Paris.
- Wallace A.R. 1876. . The geographical distribution of animals. Macmillan, London.
- Martiny JBH et al. Microbial biogeography: putting microorganisms on the map Nature: FEBRUARY 2006 | VOLUME 4
- Cavalcanti, Mauro. (2009). Biogeography and GIS. http://digitaltaxonomy.infobio.net/?Software:Biogeography_and_GIS
- MacArthur R.H.; Wilson E.O. 1967. The theory of island biogeography. 
- Lyell, Charles. 1830. Principles of geology, being an attempt to explain the former changes of the Earth's surface, by reference to causes now in operation. London: John Murray. Volume 1.
- Lomolino, Mark V., and Lawrence R. Heaney. 2004. Frontiers of biogeography: new directions in the geography of nature. Sunderland, Mass: Sinauer Associates
- This work expanded their 1963 paper on the same topic.
- This applies to British and American academics; landscape ecology has a distinct genesis among European academics.
- MacArthur R.H.; Wilson E.O. 1967. The theory of island biogeography.
- The New Biogeography and its Niche in Physical Geography. D. WATTS Geography, Vol. 63, No. 4, ANNUAL CONFERENCE 1978 (November 1978), pp. 324-337
- Stephen D. Prince and Samuel N. Goward. "Global Primary Production: A Remote Sensing Approach" Journal of Biogeography, Vol. 22, No. 4/5, Terrestrial Ecosystem Interactions with Global Change, Volume 2 (Jul. - Sep., 1995), pp. 815-835
- "Remote Sensing Data and Information." Remote Sensing Data and Information. http://rsd.gsfc.nasa.gov/rsd/RemoteSensing.html (accessed April 28, 2014).
- 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. doi:10.1111/j.1365-2699.2006.01507.x (HTML abstract)
- Lovejoy, N. R., S. C. Willis, & J. S. Albert (2010) Molecular signatures of Neogene biogeographic events in the Amazon fish fauna. Pp. 405-417 in Amazonia, Landscape and Species Evolution, 1st edition (Hoorn, C. M. and Wesselingh, F.P., eds.). London: Blackwell Publishing.
- Lynne R. Parenti, Malte C. Ebach: Comparative Biogeography: Discovering and Classifying Biogeographical Patterns of a Dynamic Earth, Introduction, page 9
Notes and references
- Alfred Russel Wallace
- Allen's rule
- Bergmann's rule
- Bibliography of biology
- Biome (biogeographic realm)
- Continental drift
- Charles Darwin
- Distance decay
- Ecological land classification
- Landscape ecology
- Marine ecoregions
- Max Carl Wilhelm Weber
- Miklos Udvardy
- Sky island
- Systematic and evolutionary biogeography association
- Tectonic plates
- Systematic biogeography is the study of biotic area relationships, their distribution, and hierarchical classification;
- Evolutionary biogeography is the proposal of evolutionary mechanisms responsible for organismal distributions. Possible mechanisms include widespread taxa disrupted by continental break-up or individual episodes of long-distance movement;
The study of comparative biogeography can follow two main lines of investigation:
- 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
- endemic areas
- geodispersal – the erosion of barriers to biotic dispersal and gene flow, that permit range expansion and the merging of previously isolated biotas
- range and distribution
- vicariance – the formation of barriers to biotic dispersal and gene flow, that tend to subdivide species and biotas, leading to speciation and extinction
Some fundamental concepts in biogeography include:
Paleobiogeography also helps constrain hypotheses on the timing of biogeographic events such as vicariance and geodispersal, and provides unique information on the formation of regional biotas. For example, data from species-level phylogenetic and biogeographic studies tell us that the Amazonian fish fauna accumulated in increments over a period of tens of millions of years, principally by means of allopatric speciation, and in an arena extending over most of the area of tropical South America (Albert & Reis 2011). In other words, unlike some of the well-known insular faunas (Galapagos finches, Hawaiian drosophilid flies, African rift lake cichlids), the species-rich Amazonian ichthyofauna is not the result of recent adaptive radiations.
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. 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.
Biogeography now incorporates many different fields including but not limited to physical geography, geology, botany and plant biology, zoology, and general biology. A biogeographer’s main focus is on what environmental factors and what the influence of man does to the distribution of the specific species of study. In terms of applications of biogeography as a science today, technological advances have allowed satellite imaging and processing of the Earth. Two main types of satellite imaging that are important within modern biogeography are Global Production Efficiency Model (GLO-PEM) and General Information Sensing (GIS). GLO-PEM uses satellite-imaging gives “repetitive, spatially contiguous, and time specific observations of vegetation.” These observations are on a global scale. GIS can show certain processes on the earth’s surface like whale locations, sea surface temperatures, and bathymetry. Current scientists also use coral reefs to delve into the history of biogeography through the fossilized reefs.
Modern Applications of Biogeography
In recent years, one of the most important and consequential developments in biogeography has been to show how multiple organisms, including mammals like monkeys and reptiles like lizards, overcame barriers such as large oceans that many biogeographers formerly believed were impossible to cross. See also Oceanic dispersal.
Biogeography continues as a point of study for many life sciences and geography students worldwide, however it may be under different broader titles within institutions such as ecology or evolutionary biology.
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.
This added to the long-standing 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.
The publication of The Theory of Island Biogeography by Robert MacArthur and E.O. Wilson in 1967 showed that the species richness of an area could be predicted in terms of such factors as habitat area, immigration rate and extinction rate.
Alfred Russel Wallace studied the distribution of flora and fauna in the Amazon Basin and the Malay Archipelago in the mid-19th century. His research was essential to the further development of biogeography, and he was later nicknamed the "father of Biogeography". He and Philip Sclater saw biogeography as a source of support for the theory of evolution as they used Darwin's conclusion to explain how biogeography was similar to a record of species inheritance. Key findings, such as the sharp difference in fauna either side of the Wallace Line, and the sharp difference that existed between North and South America prior to their relatively recent faunal interchange, can only be understood in this light. Otherwise, the field of biogeography would be seen as a purely descriptive one.
Moving on to the 20th century, Alfred Wegener introduced the Theory of Continental Drift in 1912, though it was not widely accepted until the 1960s. This theory was revolutionary because it changed the way that everyone thought about species and their distribution around the globe. The theory explained how continents were formerly joined together in one large landmass, Pangea, and slowly drifted apart due to the movement of the plates below Earth’s surface. The evidence for this theory is in the geological similarities between varying locations around the globe, fossil comparisons from different continents, and the jigsaw puzzle shape of the landmasses on Earth. Though Wegener did not know the mechanism of this concept of Continental Drift, this contribution to the study of biogeography was significant in the way that it shed light on the importance of environmental and geographic similarities or differences as a result of climate and other pressures on the planet.
20th and 21st Century
, and the sharp difference that existed between North and South America prior to their relatively recent faunal interchange, can only be understood in this light. Using these factors, he studied their influence on the survival of species. Wallace believed species were dynamic by responding to biotic and abiotic factors. Wallace Line Wallace participated in fieldwork researching the habits, breeding and migration tendencies, and feeding behavior of thousands of species. Wallace studied the distribution of flora and fauna in the Amazon Basin and the Malay Archipelago in the mid-19th century. Wallace and Sclater saw biogeography as a source of support for the theory of evolution. Key findings, such as the sharp difference in fauna either side of the  Later on in the 19th century,
In the 19th century, several additional scientists contributed new theories to further develop the concept of biogeography. Charles Lyell, being one of the first contributors in the 19th century, developed the Theory of Uniformitarianism after studying fossils. This theory explained how the world was not created by one sole catastrophic event, but instead from numerous creation events and locations. Uniformitarianism also introduced the idea that the Earth was actually significantly older than was previously accepted. Using this knowledge, Lyell concluded that it was possible for species to go extinct. Since he noted that earth’s climate changes, he realized that species distribution must also change accordingly. Lyell argued that climate changes complemented vegetation changes, thus connecting the environmental surroundings to varying species. This largely influenced Charles Darwin in his development of the theory of evolution.
Augustin de Candolle contributed to the field of biogeography as he observed species competition and the several differences that influenced the discovery of the diversity of life. He was a Swiss botanist and created the first Laws of Botanical Nomenclature in his work, Prodromus. He discussed plant distribution and his theories eventually had a great impact on Charles Darwin, who was inspired to consider species adaptations and evolution after learning about botanical geography. De Candolle was the first to describe the differences between the small-scale and large-scale distribution patterns of organisms around the globe.
Following this period of exploration came the Age of Enlightenment in Europe, which attempted to explain the patterns of biodiversity observed by Buffon and Linnaeus. At the end of the 18th century, Alexander von Humboldt, known as the “founder of plant geography”, developed the concept of physique generale to demonstrate the unity of science and how species fit together. As one of the first to contribute empirical data to the science of biogeography through his travel as an explorer, he observed differences in climate and vegetation. The earth was divided into regions which he defined as tropical, temperate, and arctic and within these regions there were similar forms of vegetation. This ultimately enabled him to create the isotherm, which allowed scientists to see patterns of life within different climates. He contributed his observations to findings of botanical geography by previous scientists, and sketched this description of both the biotic and abiotic features of the earth in his book, Cosmos.
 Buffon also studied fossils which led him to believe that the earth was over tens of thousands of years old, and that humans had not lived there long in comparison to the age of the earth. Closely after Linnaeus,
 The first discoveries that contributed to the development of biogeography as a science began in the mid-18th century, as Europeans explored the world and discovered the biodiversity of life. During the 18th century most views on the world were shaped around religion and for many natural theologists, the bible.
One scientist who recognized the importance of these geographic locations was Charles Darwin, who remarked in his journal "The Zoology of Archipelagoes will be well worth examination". Two chapters in On the Origin of Species were devoted to geographical distribution.
Biogeography is most keenly observed on the world's islands. These habitats are often much more manageable areas of study because they are more condensed than larger ecosystems on the mainland. Islands are also ideal locations because they allow scientists to look at habitats that new invasive species have only recently colonized and can observe how they disperse throughout the island and change it. They can then apply their understanding to similar but more complex mainland habitats. Islands are very diverse in their biomes, ranging from the tropical to arctic climates. This diversity in habitat allows for a wide range of species study in different parts of the world.
 Often mathematical models and GIS are employed to solve ecological problems that have a spatial aspect to them.