Allopatric Speciation Quotes

Every species has come into existence coincident both in space and time with a pre-existing closely allied species.

I did not claim that speciation occurs only in founder populations.

We observe closely related species in sympatry and infer how they evolved from a common ancestor.

The process of speciation is completed with the cessation of genetic exchange.

When students of other sciences ask us what is now currently believed about the origin of species, we have no clear answer to give. Faith has given way to agnosticism. Meanwhile, though our faith in evolution stands unshaken we have no acceptable account of the origin of species.

Ordinary speciation remains fully adequate to explain the causes and phenomenology of punctuation.

If evolution almost always occurs by rapid speciation in small, peripheral isolates, then what should the fossil record look like? We are not likely to detect the event of speciation itself. It happens too fast, in too small a group, isolated too far from the ancestral range.

That natural selection can produce changes within a type is disputed by no one, not even the staunchest creationist. But that it can transform one species into another — that, in fact, has never been observed.

A species consists of a group of populations which replace each other geographically or ecologically and of which the neighboring ones integrate or hybridise wherever they are in contact or which are potentially capable of doing so (with one or more of the populations) in those cases where contact is prevented by geographical or ecological barriers.