Search results
Results from the WOW.Com Content Network
In evolutionary biology, sympatric speciation is the evolution of a new species from a surviving ancestral species while both continue to inhabit the same geographic region. In evolutionary biology and biogeography , sympatric and sympatry are terms referring to organisms whose ranges overlap so that they occur together at least in some places.
In biology, two related species or populations are considered sympatric when they exist in the same geographic area and thus frequently encounter one another. [1] An initially interbreeding population that splits into two or more distinct species sharing a common range exemplifies sympatric speciation .
Rapid sympatric speciation can take place through polyploidy, such as by doubling of chromosome number; the result is progeny which are immediately reproductively isolated from the parent population. New species can also be created through hybridization , followed by reproductive isolation, if the hybrid is favoured by natural selection.
allo-sympatric speciation A mode of speciation where divergence occurs in allopatry and is completed upon secondary contact of the populations–effectively a form of reinforcement. [6] [3] altruism anagenesis Evolutionary change that occurs within a species lineage as opposed to lineage splitting (cladogenesis). [7] analogous structures
Allopatric speciation, in which two populations of the same species are geographically isolated from one another by an extrinsic barrier and evolve intrinsic (genetic) reproductive isolation. Peripatric speciation, in which a small group of a population is separated from the main body and experiences genetic drift.
A simplification of an allopatric speciation experiment where two lines of fruit flies are raised on maltose and starch media. Laboratory experiments of speciation have been conducted for all four modes of speciation: allopatric, peripatric, parapatric, and sympatric; and various other processes involving speciation: hybridization, reinforcement, founder effects, among others.
Parapatric speciation – Speciation within a population where subpopulations are reproductively isolated; Sympatric speciation – Evolution of a new species from an ancestor in the same location; Artificial speciation Animal husbandry – Management of farm animals; Plant breeding – Humans changing traits, ornamental/crops
Just as sunlight can appear as a dim crack in the sky before clouds part, the coarse boundaries of ecotypes may appear as a separation of principle component clusters before speciation. — David B. Lowry, Ecotypes and the controversy over stages in the formation of new species, Biological Journal of the Linnean Society.