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 ...

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 ...

"Most new species come about in geographic isolation," said Christian Rabeling, assistant professor of biology at the University of Rochester. "We now have evidence that speciation can take place ...

"A large island equals more speciation events ... Over time, the groups diverge so that even if the geographic barrier that caused the isolation was removed, they are now separate species and ...

“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 ...

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 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 ...

Scientists are on more solid footing regarding the factors that slow or speed speciation generally — namely environmental pressure and reproductive isolation, Smith said. "Across all species ...

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 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 ...