Sentences with word «vicariance»

Yet, in many cases, statistical dating of evolutionary events indicated that the breakup of land masses occurred tens of millions of years before some species» ancestors evolved, bringing into question the validity of vicariance methods.

This view, called «vicariance biogeography,» became the dominant paradigm.

The new study compares the theories of jump dispersal and vicariance in a new computational program developed by Nicholas J. Matzke, a postdoctoral fellow at the National Institute for Mathematical and Biological Synthesis.

The fact that the SNPs used for each of these loci fall on the branch uniting divergent haplogroups, which is consistent with ancient vicariance and reciprocal monophyly being attained in the past before hybridization took place, suggests that high levels of admixture may have eroded any clinal differentiation in HPRT1.

Speciation by vicariance is widely regarded as the most common form of speciation; and is the primary model of allopatric speciation.

In fact, the vicariance view became so dominant that computer programs designed to estimate the biogeographic history of a species left out jump dispersal entirely, and these programs have been used in hundreds of studies in recent years.

«Conventional biogeography said vicariance was a more scientific explanation than jump dispersal because vicariance relied on normal, predictable processes, and jump dispersal relied on extremely rare, near - miraculous events,» Matzke said.

Using data from many species that live on the Hawaiian Islands and on other archipelagos, Matzke found that jump dispersal was able to explain the biogeography of the species with a far greater statistical probability than through the vicariance method.