speciation

The result, in the first half of the book, is a dense but lucid guide to the history and biology of speciation on Earth.

An initial pulse of evolution produced a slew of new species with different body shapes, which lent support to the idea that speciation is concentrated near the beginning of an adaptive radiation.

Proponents of the hologenome idea, meanwhile, have tried to demonstrate that microbes can drive speciation.

Natural selection plus geographical and ecological isolation has undoubtedly been operative in speciation and in subspeciation.

Nutrition may be also a factor influencing speciation in bird life.

According to present-day concepts of variation and speciation, Andersen's criteria are artificial.

Additional remarks on the distribution of this species are in the section on Zoogeography and Speciation.

In fact, isolation is a most important factor in speciation of insular populations (Baker, 1951:55).