[jwalsh07]

Natural selection decreases genetic variance.

Find some other mechanisms, they abound.

[Delacon]

“Natural selection decreases genetic variance.”

Not that easy. Only locally. Genetic dominance causes some species to flee the area and find dominance in another area and at the same time some to settle and be susceptible to other specie's domination.

“Find some other mechanisms, they abound.”

Can you list these abounding mechanisms? I mean other that ID.