Islands epitomize allopatric speciation, where geographic isolation causes individuals of an original species to accumulate sufficient genetic differences to prevent them breeding with each other ...

Unlike Mayr in his early work, the authors admit, albeit with palpable hesitation, that speciation can also occur without geographic isolation, in overlapping or ‘sympatric’ areas. Sympatric ...

Geographic isolation of populations is often regarded ... as mating between the two populations is precluded. Whether or not speciation can occur under conditions in which gene flow between ...

Most new species develop in geographic isolation from the original species, a concept called allopatric speciation. It is rare for a species like the parasite ants to evolve from another species ...

“Geographic isolation is a phenomenon that has the potential to reduce, or even prevent, gene flow among populations, and this is one of the primary causes of speciation – the formation of new ...

"We prove that their isolation favored allopatric speciation, meaning speciation occurring in separate regions because of geographic barriers. Darwin proposed this kind of speciation in his ...

Reproductive isolation that leads to speciation may be geographical, ecological, temporal, behavioral, mechanical, gametic, or due to hybrid inviability or hybrid sterility. For more information ...

The relative role of drift is commonly overlooked or ignored in speciation," Black said. He noted that factors like small populations, geographic isolation and the harsh desert ecosystem that ...

But geographical isolation is not enough to explain all speciation. Clearly, organisms do sometimes speciate even if there is no clear river or mountain separating them. The other mechanism that ...

But according to a study published this week in Nature, new species can arise arbitrarily and without provocation, challenging the widely held notion that physical isolation and selection are the ...

The result validates an underappreciated mechanism of so-called reproductive isolation, a key component of speciation. The formation of a species means that a group of organisms splits into two ...