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Related to Sympatry: speciation, Sympatric speciation



a type of species formation in which new species arise from populations with strongly overlapping or coinciding home ranges. Sympatry is only possible when two forms coexisting within the limits of a common home range or in part of a home range do not interbreed. The opposite case, allopatry, is species formation from populations with nonoverlapping areas. As a rule, allopatry is characteristic of all intraspecific groups; exceptions appear to be seasonal varieties of certain plants and winter and spring strains of many fishes having a common reproduction range, although it is used at different times.

Sympatry is only possible for forms that cannot interbreed, that is, in the case of any type of biological isolation. The concepts “sympatry” and “allopatry” are widely used in the analysis of species-formation processes. The existence of sympatric species often results from allopatric species formation and the subsequent settlement of the home range of one species by individuals of another species. Transitional stages between sympatry and allopatry also exist.


Timofeev-Resovskii, N. V., A. V. Iablokov, and N. V. Glotov. Ocherk ucheniia opopuliatsii. Moscow, 1973.
Mayr, E. Populiatsii, vidy i evoliutsiia. Moscow, 1974. (Translated from English.)
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Hochkirch A, Groning J, Bucker A (2007) Sympatry with the devil: reproductive interference could hamper species coexistence.
At the local level, we tested the degree of genetic divergence by paired between-species [F.sub.ST] at the two localities were all species coexist in sympatry, i.e.
The 2x2 [theta] shows values which were not significant in sympatry (U-Mann Whitney test, P = 0.353), but showed a difference for Itaipu (-U Mann Whitney test, P = 0.008) and near significance for Prainha (U-Mann Whitney test, P = 0.083).
(2011a) suggested that a prezygotic explanation is more likely owing to the lack of hybrid individuals and strong Wahlund effect in areas of sympatry. Sympatric species of Hexagrammos in the northeastern Pacific show similar patterns of segregation (Crow et al., 2010).
arcticum in sympatry. The presence of a IIS-15/IIL-9 male at the Kootenai suggests combinational types are present and that potential mating trials may be occurring between these taxa.
By contrast, we observed the consumption of medium-sized prey by both predator species, despite the fact that sympatry with the larger-bodied jaguar may have imposed additional selective pressure on puma to use smaller prey (Scognamillo et al.
These points are indications that the two water snake species either could exist in sympatry around Jalalabad, or X.
Midas cichlids Nicaraguan freshwater fishes where multiple species diverged in sympatry in crater lakes after colonization from larger source lakes are the ideal model to study the influence of plasticity in speciation.
To shed light on this question, data was requested from CDPW for three additional Colorado reservoirs where cutthroat and rainbow trout are found in sympatry. Year to year condition factors were computed as described above and are shown in Figures 6, 7, and 8.
Distribution and Biology of Bull Trout (Salvelinus confluentus) in the Mackenzie Valley, Northwest Territories, with Notes on Sympatry with Dolly Varden (Salvelinus ma/ma).
Arenaviruses and hantaviruses occur over widespread geographic areas, however, little is known about the distribution of individual viruses across most of their range, though it has been documented that multiple viruses (at both the generic and specific levels) can occur in geographic sympatry (Mantooth et al.