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Disjunct distributions can occur when suitable habitat is fragmented, which produces fragmented populations, and when that fragmentation becomes so divergent that species movement between one suitable habitat to the next is disrupted, isolated population can be produced.
A disjunctive population, in ecology, is a colony of plants, animals, or other organisms whose geographical locus is severed from the continuous range of the bulk of the species distribution. Although a disjunctive population may sometimes occur on an island, [ 1 ] which creates physical separation via water, a large percentage of disjunctive ...
Species distribution models include: presence/absence models, the dispersal/migration models, disturbance models, and abundance models. A prevalent way of creating predicted distribution maps for different species is to reclassify a land cover layer depending on whether or not the species in question would be predicted to habit each cover type.
Antitropical (alternatives include biantitropical or amphitropical) distribution is a type of disjunct distribution where a species or clade exists at comparable latitudes across the equator but not in the tropics. For example, a species may be found north of the Tropic of Cancer and south of the Tropic of Capricorn, but not in between. [1]
Based on its disjunct distribution, the species might have occurred on all main islands except the island of Hawaii and perhaps Kauai, although more fossils are needed for confirmation. [50] The primitive koa finch populations from Oahu and Maui might represent two distinct species, but more fossils or genetic data are necessary. [ 50 ]
Panbiogeography, originally proposed by the French-Italian scholar Léon Croizat (1894–1982) in 1958, [1] [2] is a cartographical approach to biogeography that plots distributions of a particular taxon or group of taxa on maps, and connects the disjunct distribution areas or collection localities together with lines called tracks , regarding vicariance as the primary mechanism for the ...
First proposed by the paleobotanists J.S. Gardner and C. Ettinghausen in 1879, the concept was intended to answer questions about the disjunct distribution of identical or closely related plant species: for instance, magnolia and tulip trees are native to both the Southeast United States and southern China and Indochina. [2] [3]
Having geographically separate, non-overlapping ranges of distribution. [17] Contrast sympatric. alternate 1. (adj.) (of leaves or flower s) Borne singly at different levels along a stem, including spiralled parts. Contrast opposite. 2. (prep.) Occurring between something else, e.g. stamen s alternating with petal s. alternipetalous