Discussion of everything related to the Theory of Evolution.
Yes, natural selection reduces variation by weeding out maladaptive genes. Mutations of various kinds provide new genes and alleles for natural selection to act on.
A good example of what you are asking about happened in Yellowstone National Park. When wolves were removed (early 1900s), moose, elk and deer were able to be lazy and lounge in the shade of aspen groves where they ate all of the young aspens. This resulted in very few (none, in some places) new aspens and the groves were starting to die off. However, when wolves were reintroduced, they started hanging out in the shade and the moose, deer and elk left to avoid being eaten. This allowed new aspens to grow. If the wolves hadn't been reintroduced, many aspen groves would have disappeared.
I remember reading a similar (but more complicated) story about orcas, seals, sea lions, fish, sea otters, kelp and sea urchins one time.....I should look that up....
"Nothing in biology makes sense except in the light of evolution."
"Most people who hate the idea of evolution do so because if it was working properly, they'd be dead."
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