For the line in triangle geometry, see Simson line.
Wallace's Line delineates Australian and Southeast Asian fauna. The probable extent of land at the time of the Last Glacial Maximum, when the sea level was more than 110 m (360 ft) lower than today, is shown in grey. The deep water of the Lombok Strait between Bali and Lombok formed a water barrier even when lower sea levels linked the now-separated islands and landmasses on either side.
The Wallace line or Wallace's line is a faunal boundary line drawn in 1859 by the British naturalist Alfred Russel Wallace and named by the English biologist T.H. Huxley that separates the biogeographical realms of Asia and 'Wallacea', a transitional zone between Asia and Australia also called the Malay Archipelago and the Indo-Australian Archipelago. To the west of the line are found organisms related to Asiatic species; to the east, a mixture of species of Asian and Australian origins is present. Wallace noticed this clear division in both land mammals and birds during his travels through the East Indies in the 19th century.
The line runs through Indonesia, such as Makassar Strait between Borneo and Sulawesi (Celebes), and through the Lombok Strait between Bali and Lombok, where the distance is strikingly small, only about 35 kilometers (22 mi), but enough for a contrast in species present on each island. The complex biogeography of the Indo-Australian Archipelago is a result of its location at the merging point of four major tectonic plates and other semi-isolated microplates in combination with ancient sea levels. Those caused the isolation of different taxonomic groups on islands at present relatively close to each other. Wallace's line is one of the many boundaries drawn by naturalists and biologists since the mid-1800s intended to delineate constraints on the distribution of the fauna and flora of the archipelago.[1]
^Ali, Jason R.; Heaney, Lawrence R. (June 2021). "Wallace's line, Wallacea , and associated divides and areas: History of a tortuous tangle of ideas and labels". Biological Reviews. 96 (3): 922–942. doi:10.1111/brv.12683. ISSN 1464-7931. PMID 33502095. S2CID 231764849.
The Wallaceline or Wallace'sline is a faunal boundary line drawn in 1859 by the British naturalist Alfred Russel Wallace and named by the English biologist...
Malay Archipelago, where he identified the faunal divide now termed the WallaceLine, which separates the Indonesian archipelago into two distinct parts:...
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trip to Bali was instrumental in helping him devise his WallaceLine theory. The WallaceLine is a faunal boundary that runs through the strait between...
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the Wallacea region, except for the Bali province which is west of the WallaceLine and is within the Sunda Shelf. Together with the Greater Sunda Islands...
boundary known as Lydekker's Line, while the WallaceLine (separating Wallacea from Sunda) defines its western border. The Weber Line is the midpoint, at which...
DNA in modern Papuans and Australians, Denisovans may have crossed the WallaceLine into these regions (with little back-migration west), the second known...
west, to Southern China in the east, and to Southeast Asia west of the WallaceLine in the south. It is likely that Anabas testudineus is a species complex...
position on the Equator. Island Southeast Asia is crossed by the WallaceLine. This line divides the flora and fauna of Asia from that of Australia and...
collinear. The line through these points is the Simson line of P, named for Robert Simson. The concept was first published, however, by William Wallace in 1799...
Bali, and Borneo, east of which lies the Wallaceline, the realm boundary named after Alfred Russel Wallace which separates Indomalaya from Australasia...
over Africa, southern Europe, and South and Southeast Asia, across the WallaceLine. Almost all viverrids outside the subfamily Genettinae are commonly called...
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is an herbivore. Some theories debunked it as for the fact that the WallaceLine is responsible for separating species that exists within the areas of...
or it may manifest itself as a sharp boundary line. The word ecotone was coined by Alfred Russel Wallace, who first observed the abrupt boundary between...
studies in the region. He proposed what would come to be known as the "WallaceLine", a boundary that separated the flora and fauna of Asia and Australia...
different fauna of Australasia. The boundary is known as the WallaceLine, for Alfred Russel Wallace, who first remarked upon the striking difference between...
and the east which is more influenced by Australasian species. The WallaceLine, around which lies the Wallacea transitional region, notionally divides...
Sunda stink badger or teledu (M. javanensis). They live west of the WallaceLine; the Sunda species on islands of the Greater Sunda Islands, being Sumatra...
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east of the Wallaceline are known as Wallacea, a separate biogeographical region that is considered part of Australasia. The WallaceLine corresponds...
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in India, including plants similar to those in Australia beyond the WallaceLine. Jamu practices may vary from region to region, and are often not recorded...
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west of New Guinea known as Wallacea. Bali, on the other side of the WallaceLine, has a single species. In total, there are 186 species in 55 genera,...
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